Jongho Yoon - Academia.edu (original) (raw)

Papers by Jongho Yoon

Research paper thumbnail of Uncertainty Assessment of Mean Radiant Temperature Estimation for Indoor Thermal Comfort Based on Clustering Analysis of Reduced-Input Surfaces

Buildings

Mean radiant temperature (MRT) is important for indoor thermal comfort determination. Several goo... more Mean radiant temperature (MRT) is important for indoor thermal comfort determination. Several good ways to practically obtain accurate MRT include measuring all indoor surface temperatures for MRT calculation or using a black globe thermometer. Still, it can be hard to apply in practice because using such experimental measurements increases the efforts of data management times and acquisition costs. In this regard, there is a practical advantage in reducing the number of measured surfaces by grouping similar surfaces rather than measuring all indoor surface temperatures individually to obtain MRT. However, since even those similar surfaces are not the same, it can lead to erroneous MRT estimation, which needs to be investigated. This study analyzes the uncertainty of MRT estimates by categorizing the surfaces with similar temperature behaviors to examine the risk of such inaccuracy. In this study, the input data required for the MRT calculation are generated using a measurement data...

Research paper thumbnail of Development and Implementation of Photovoltaic Integrated Multi-Skin Façade (PV-MSF) Design Based on Geometrical Concepts to Improve Building Energy Efficiency Performance

Sustainability

This study presents the influence of multi-skin façade (MSF) design with photovoltaic (PV) system... more This study presents the influence of multi-skin façade (MSF) design with photovoltaic (PV) systems on the thermal behaviors and power generation potential when installed on the entire southern façade of an office building model. This study considers various flexible changes in MSF system design based on geometrical concepts. For the simulation model development, this study uses the medium-sized prototype office building model, developed based on the ASHRAE 90.1-2019. A total of 24 different patterns are created based on a pyramid configuration: triangular pyramid (TP) and rectangular pyramid (RP). Changing the tilt angle for PV integrated surfaces is the main method used to compare the power generation efficiency of different MSF configurations. Results from this analysis indicate that the proposed PV-integrated MSF system with generated patterns tends to reduce cooling and heating demands. The system also presents increased PV power generation performance compared to vertically ins...

Research paper thumbnail of The Assessments of Operational Performance for North-facing PV System based on Measured Data

Journal of the Korean Solar Energy Society

Photovoltaic (PV) systems are commonly used as on-site electric power generators for ZEBs in the ... more Photovoltaic (PV) systems are commonly used as on-site electric power generators for ZEBs in the Republic of Korea. To enhance the performance of PV systems, considering efficient installation conditions, such as the optimal azimuth and tilt angles, is critical. Under domestic PV application guidelines, the azimuth of installation for building-applied PV systems is stipulated within a maximum of ±90° based on the south-facing direction. In general, the northfacing direction is known as a weak position for PV systems. However, several studies have shown that the north-facing direction can be a good option for building PV installations, typically when the installation areas are limited within a building site. Even if the PV panel faces north, the system can operate effectively with proper performance when installed at a suitable inclination angle. In existing studies, system behavior has been verified based on simulationbased analysis, but actual operational data analysis remains insufficient. This study aims to evaluate the feasibility of north-facing PV systems based on a performance evaluation of the measured data of a roof PV system. The roof PV system analyzed in this study was composed of modules, module-level power electronics (MLPE), and one inverter. The PV modules and MLPEs were installed on both the southern (SIR) and northern (NIR) inclined roofs. Based on the annual cumulative DC power, the energy yields of the MLPE connected to modules of the SIR and NIR are 1,445.0 and 1,068.7 kWh/kWp, respectively. Our study found that the ratio of the performance of MLPE on the NIR to MLPE on the SIR was 74.0%. This ratio was similar to the energy yield of the PV system on the south vertical plane as compared to that on the south slope plane. The analyzed results revealed that an acceptable performance of the PV system installed on a northern slope at a suitable inclination angle could be expected as compared with other PV installations such as the southern vertical.

Research paper thumbnail of Heat Flux and Thermal Characteristics of Electrically Heated Windows: A Case Study

Sustainability, 2022

Energy loss through windows can be high relatively compared to other opaque surfaces because insu... more Energy loss through windows can be high relatively compared to other opaque surfaces because insulation performance of fenestration parts is lower in the building envelope. Electrically heated window systems are used to improve the indoor environment, prevent condensation, and increase building energy efficiency. The purpose of this study is to analyze the thermal behaviors of a heated window under a field experiment condition. Experiments were conducted during the winter season (i.e., January and February) with the energy-efficient house that residents occupy. To collect measured data from the experimental house, temperature and heat flux meter sensors were used for the analysis of heat flow patterns. Such measured data were used to calculate heat gain ratios and compare temperature and dew point distribution profiles of heated windows with input power values under the changed condition in the operating temperature of the heated glazing. Results from this study indicated that the i...

Research paper thumbnail of Comparative investigation on building energy performance of double skin façade (DSF) with interior or exterior slat blinds

Journal of Building Engineering, 2018

Advanced passive control technologies attract a great deal of attention by architects and enginee... more Advanced passive control technologies attract a great deal of attention by architects and engineers as a way of achieving both high indoor environmental quality and energy efficient buildings. This study investigates the thermal and daylighting effects of a double skin façade (DSF) system with interior and exterior blinds. A buffer type DSF and slat type blinds are used for this comparative study. To investigate thermal and daylighting effects of three passive control models, evaluation of annual heating, cooling, and lighting loads is conducted using a widely-accepted whole building energy modeling program, EnergyPlus. A simulated DSF model is developed using the air-flow network (AFN) model in EnergyPlus and calibrated against measured data from an experimental DSF facility installed to an office building in Daejeon, South Korea. After a proper calibration of the simulated DSF model, the impact of blinds in the cavity of the DSF is also evaluated by adopting a slat blind model in EnergyPlus. For exterior and interior blind models, the simulated DSF model is modified by removing a DSF box and adding slat blinds at inner and outer surfaces of the windows. A Radiancebased daylighting simulation program, Daysim, is used to evaluate daylighting aspects of blinds and lighting controls within an office building with simulated DSF, interior blind, and exterior blind models. Generated lighting and blind raise/lower control schedules from Daysim are used as input values in EnergyPlus for annual thermal and lighting load calculations. In addition, the impact of natural ventilation to reduce trapped hot air within the cavity of the DSF box is considered in this study during a cooling period only for the DSF model. Results indicate that the simulated DSF model can save up to 40%, 2%, and 5% for heating, cooling, and total loads, respectively, when compared to the baseline (i.e., No passive technologies) without any blinds or controls. With the combination of the daylight-based dimming control based on the indoor illuminance levels and the blind raise/lower control, the simulated DSF and the exterior blind models could potentially reduce the building thermal loads and lighting energy consumption, ranging around 27% to 52%.

Research paper thumbnail of Evaluation of Daylighting Performance and Design of a Curved-Lightshelf by the Ray Tracing Method

Journal of the Korean Solar Energy Society, 2011

* De p t .o fAr c h i t e c t u r a lE n g ,Gr a d u a t eS c h o o lHa n b a tNa t i o n a lUn i... more * De p t .o fAr c h i t e c t u r a lE n g ,Gr a d u a t eS c h o o lHa n b a tNa t i o n a lUn i v e r s i t y (t a c q t a c @n a v e r. c o m) , * * De p t .o fAr c h i t e c t u r a lE n g ,Ha n b a tNa t i o n a lUn i v e r s i t y (j h y o o n @h a n b a t. a c. k r) , * * * De p t .o fAr c h i t e c t u r a lE n g ,Da e j e o nUn i v e r s i t y (S h i n u c @d j u. a c. k r) , * * * * De p t .o fAr c h i t e c t u r a lE n g ,Ha n b a tNa t i o n a lUn i v e r s i t y (k wh l e e @h a n b a t. a c. k r) Ke y wo r d s: 자연채광(Da y l i g h t) , 곡면형-광선반(C u r v e d-L i g h t s h e l f) , 시뮬레이션(S i mu l a t i o n) , 실내조도(I n d o o rI l l u n i ma c e) , 휘도

Research paper thumbnail of A Study on the Optimum Application Method of Solar Thermal System to reduce Thermal Load and Carbon Emission in Apartment Building

Journal of the Korean Solar Energy Society, 2011

Research paper thumbnail of Thermal Performance Analysis for Optimal Operation of Solar Hot Water System

Journal of the Korean Solar Energy Society, 2011

Research paper thumbnail of Heating and Cooling Energy Performance Analysis of Residential Building with TI-Wall System

한국태양에너지학회 2004 Proceedings Isea Asia Pacific, Oct 1, 2004

In previous study, heating and overheating performance was carried out through test-cell measurem... more In previous study, heating and overheating performance was carried out through test-cell measurement used by TI-wall(Transparent Insulation) system and mass-wall system and the optimum composition of TI-wall system was proposed by simulation analysis in the Korean weather condition. The aim of this study was to analysis the heating and cooling performance following the optimum configuration of TI-wall used in residential building. The process of this study is as follows: 1) The ESP-r simulation program was used in energy performance analysis and the reference model of residential building was made up to analysis energy performance on Ti-wall and mass-wall system. 2) Standard weather file of Seoul, Daejeon and Cheju was made that was the format of simulation program(ESP-r). 3) The regional heating and cooling energy performance was carried out by using regional standard weather file of TI-wall and mass-wall system in residential building and the reduction of heating and cooling energy with the change of wall size of per system was analyzed. 4) The energy reduction of TI- wall system of foreign country was compared with that of Korean.

Research paper thumbnail of An Analysis of Electricity Consumption Profile based on Measurement Data in Apartment Complex in Daejeon

Kieae Journal, 2011

This study is to analysis the characteristics of electric power consumption of apartments complex... more This study is to analysis the characteristics of electric power consumption of apartments complex in Korea. This study shows the pattern of electric power consumption and correlation of each apartment complex's completion year monthly and timely. With this result, we are able to predict the demand pattern of electricity in a house and make the schedule by demand pattern. It is expected this data is used as reference of electric consumption of Daejeon area to operate the simulation tools to predict the building energy. The yearly data of 10 apartment complexes of 2010 are analyzed. The results of this study are followed. The averaged amount of electricity consumption in winter is higher as summer because of the high capacity of heating equipment. All of the house has electric base load from 0.26kWh to 0.5kWh. The average of the electricity consumption of month is shown as 310.2kWh. A week is seperated, as 4 part such as week, weekend, Saturday and Sunday. During week, the average of timely electricity consumption is shown as 0.426kWh. The Saturday consumption is 0.437kWh. The Sunday is 0.445kWh. The peak electricity consumption in summer and winter is measured. The peak consumption on summer season is 1.389kW on 22th August 64% higher than winter season 0.887kW on 3rd January.

Research paper thumbnail of Lighting Apparatus Using Solar Cell

Research paper thumbnail of Energy Performance Evaluation of Low Energy Houses using Metering Data

Korean Journal of Air-Conditioning and Refrigeration Engineering, 2015

This study analyzed analyzes the energy performance of six houses in Daejeon completed which were... more This study analyzed analyzes the energy performance of six houses in Daejeon completed which were built in 2011. Observed The observed houses, which were all designed and constructed inof the same size and structure, are were highly insulated with triple Low-E coating windows; the insulation level of the walls is was 0.13 W/㎡K and that of the roof is was 0.10 W/㎡K. As electric houses, all of the energy supplied to the houses, including for cooking, is was supplied by electricity. A and 3~4 kWp of photovoltaic system and a 3~5 kW of ground source heat pump (GSHP) were installed in each house tofor providing provide space heating/and cooling and hot water are installed. We constructed a Web-based remote monitoring system in order to understand energy consumption and the dynamic behavior of the energy system. T, and the results of our metering data analysis of 2013 are as follows. First, the annual residential energy consumption is was 4,400 kWh (σ = 1,209) and GSHP energy consumption is was 5,182 kWh (σ = 1,164). Second, residential energy consumption ranked highest in average energy usage, with at 45% of the total, followed by heating with at 30%, hot water supply with at 17% and cooling with at 6%. Third, the average energy independence rate is was 51.8%, the GFA (Gross gross floor area) criteria average energy consumption unit is was 48.7 kWh/㎡yr (σ = 10.1), and the net energy consumption unit (except the energy yield of the PV systems) is was 24.7 kWh/㎡yr (σ = 8.8).

Research paper thumbnail of Power Performance Characteristics of Transparent Thin-film BIPV Module depending on an installation angle

This study has analysed power output characteristics of transparent thin-film PV module depending... more This study has analysed power output characteristics of transparent thin-film PV module depending on incidence angle and azimuth. The experiment results showed power outputs of transparent thin-film PV module applied to full-scale mock up model on slope of to the south. The simulation results was evaluated power outputs of transparent thin-film PV module depending on incidence angle and azimuth after calibrating the experimental and computed data. As a result. the best power output performance of transparent thin-film PV module was obtained at slope of to the south, producing the annual power output of 977kWh/kWp. The annual power output data demonstrated that the PV module with a slope of could produce a 68 % higher power output than that with a slope of with respect to the inclined slope of the module, Furthermore, the PV module facing south showed a 22 % higher power output than that facing to the east in terms of the angle of the azimuth, Specipically. the varying power output w...

Research paper thumbnail of Case Study on 5kWp Transparent Thin-Film BIPV System

This study has been carried out empirical research on Transparent Thin-film BIPV modules, BIPV mo... more This study has been carried out empirical research on Transparent Thin-film BIPV modules, BIPV modules installed on the exterior of the building are applied a laminated module 1kWp, double-glazing module 3kWp and triple-glazing module 1kWp. Applied to the total capacity of BIPV modules are 5kWp. In this study, design and construction process of BIPV systems is presented. In addition, through monitoring of the BIPV system, the temperature and the power characteristics of each module were analyzed. During the measurement period, the module temperature measurement results, the maximum surface temperature of triple-glazing BIPV module showed the highest, followed by double-glazing BIPV module , laminated modules, respectively. Power output results, the daily average double-layer modules showed 4.10kWh/day, triple-glazing module 1.57kWh, respectively 1.81kWh laminated modules. In particular, the power efficiency of triple-glazing BIPV module was lower than the power efficiency of the lam...

Research paper thumbnail of A Case Study of Electric Power Consumption Characteristics in University Building

Journal of the Korean Solar Energy Society, 2012

* De p t .o fAr c h i t e c t u r a lGr a d u a t eS c h o o l ,Da e j e o nUn i v e r s i t y (l... more * De p t .o fAr c h i t e c t u r a lGr a d u a t eS c h o o l ,Da e j e o nUn i v e r s i t y (l wj 3 1 1 6 @d j u. k r) , * * Cl i ma t eCh a n g eRe s e a r c h Di v i s i o n ,Na t i o n a l I n s t i t u t eo fEn v i r o n me n t a lRe s e a r c h , Ko r e a (e x 1 2 @k o r e a. k r) * * * C l i ma t eC h a n g eR e s e a r c hDi v i s i o n ,Na t i o n a l I n s t i t u t eo fE n v i r o n me n t a lR e s e a r c h , Ko r e a (g e r c l i b @k o r e a. k r) * * * * De p t .o fAr c h i t e c t u r a lE n g ,Ha n b a tNa t i o n a lUn i v e r s i t y (j h y o o n @h a n b a t. a c. k r) , * * * * * De p t .o fAr c h i t e c t u r a lE n g ,Da e j e o nUn i v e r s i t y (s h i n u c @d j u. k r)

Research paper thumbnail of A Study on generation characteristics of building integrated Photovoltaic system

Journal of the Korean Solar Energy Society, 2013

P a r kJ a e-Wa n * ,S h i nU-C h e u l-* * †a n dK i m D a eGo n * * * ,Y o o nJ o n g-H o * * *... more P a r kJ a e-Wa n * ,S h i nU-C h e u l-* * †a n dK i m D a eGo n * * * ,Y o o nJ o n g-H o * * * * (S u b mi td a t e :2 0 1 3 .4 .1 0. J u d g me n td a t e :2 0 1 3 .4 .1 5. P u b l i c a t i o nd e c i d ed a t e :2 0 1 3 .6 .2 4 .) Abstract:I nt h i ss t u d y ,wea n a l y z et h ep e r f o r ma n c ec h a r a c t e r i s t i c so fBu i l d i n gI n t e g r a t e dP h o t o v o l t a i c(BI P V) s y s t e m o fK Re s e a r c h Bu i l d i n g wh i c h wa sd e s i g n e dwi t h t h ea i m o fz e r oc a r b o n b u i l d i n g .I n a d d i t i o n ,BI P V s y s t e m,wh i c h i s c o n s i s to ft h r e e mo d u l e s ;G t o G(Gl a s s t o Gl a s s) ,G t o T(Gl a s s t o Te d l a r / C r y s t a l)a n d Amo r p h o u s ,h a s1 1 6. 2 k Wpo ft o t a lc a p a c i t y ,a n di sa p p l i e dt owa l l ,wi n d o w,a t r i u m a n dp a g o r ao nr o o f .

Research paper thumbnail of Calibration Procedure for Energy Performance Simulation of a Commercial Building

Journal of Solar Energy Engineering, 2003

Calibration of an energy simulation with actual data has generally been considered too difficult ... more Calibration of an energy simulation with actual data has generally been considered too difficult to be part of the energy audit procedure. The purpose of this paper is to develop a systematic method using a “base load analysis approach” to calibrate a building energy performance model with a combination of monthly utility billing data and sub-metered data such as is commonly available in large buildings in Korea. The calibration procedure was specifically developed to be suitable for use in both the audit and savings determination procedure within a retrofit process. The procedure has been visualized using a logical flow chart and demonstrated using the simulation of a 26-story commercial building located in Seoul as a case study. The results indicate that the approach developed provided a reliable and accurate simulation of the monthly and annual building energy requirements of the case study building.

Research paper thumbnail of Annual Base Performance Evaluation on Cell Temperature and Power Generation of c-Si Transparent Spandrel BIPV Module depending on the Backside Insulation Level

Journal of the Korean Solar Energy Society, 2012

Research paper thumbnail of The Prediction of Maximum Power Point Base on Artificial Neural Network for Maintenance of Building Applied Photovoltaic System

Journal of the Korean Solar Energy Society, 2021

To achieve the greatest performance, photovoltaic (PV) systems need to be continuously monitored ... more To achieve the greatest performance, photovoltaic (PV) systems need to be continuously monitored for fault detection and diagnosis, which could affect their performance under operational conditions. Various fault detection and diagnosis methods have been developed to improve these technologies. For example, the "Voltage and Current Measurement Method" based on the One-Diode model has been widely adopted in many case studies to predict a maximum power point (i.e., power, current, and voltage) and then detect any issues that occur under harsh outdoor conditions. Although the One-Diode model has demonstrated accurate performance for fault detection and diagnosis, the accuracy has typically been limited to crystalline PV modules. To overcome this limitation, many fault diagnosis methods have been proposed, and machine-learning fault detection and diagnosis methods are effective alternatives because of the nonlinear output features and varying operating conditions of PV arrays. Therefore, this study presents the prediction model of maximum power point (MPP) using artificial neural network (ANN) algorithms. The prediction model of MPP was generated through an optimization analysis. The MPP was validated by using measured data obtained from a building attached to a PV (BAPV) system in Korea. The results of the optimization study showed the highest predictive accuracy when the structure of the ANN model was trained and learned with one hidden layer, 20 neurons per hidden layer, a sigmoid function, and an 0.01 learning rate. The coefficient of variation of RMS error (CvRMSE) between the predicted value and the labelled value was 3.14%. The prediction model for MPP was verified by using the measured data. The analysis of the measured and predicted values resulted in CvRMSE values of 11.66%, 11.70%, and 18.01% for power, current, and voltage, respectively.

Research paper thumbnail of The State of the Art in BIPV Technology

Journal of the Korean Institute of Electrical and Electronic Material Engineers, 2014

The current downturn of BIPV sector has an enormous potential to rebound and expand into the PV s... more The current downturn of BIPV sector has an enormous potential to rebound and expand into the PV sector for construction market in the foreseeable future. Solar technology has already gained a significant market due to lack of natural resources in the Korean domestic market. Given the technical infrastructure of state-of-the-art fusion technology, the competitiveness of software-driven BIPV market in the world can be ver attractive and have the potential to develop as a key national technology. To do this, from the viewpoint of complexity, technical R&D, national political aspect, social aspect, economic aspect and institutional support systems need to be parallelly formulated. A dedicated BIPV sector has not yet been established, especially policy and institutional framework have very crucial impact on the establishment of BIPV sector.

Research paper thumbnail of Uncertainty Assessment of Mean Radiant Temperature Estimation for Indoor Thermal Comfort Based on Clustering Analysis of Reduced-Input Surfaces

Buildings

Mean radiant temperature (MRT) is important for indoor thermal comfort determination. Several goo... more Mean radiant temperature (MRT) is important for indoor thermal comfort determination. Several good ways to practically obtain accurate MRT include measuring all indoor surface temperatures for MRT calculation or using a black globe thermometer. Still, it can be hard to apply in practice because using such experimental measurements increases the efforts of data management times and acquisition costs. In this regard, there is a practical advantage in reducing the number of measured surfaces by grouping similar surfaces rather than measuring all indoor surface temperatures individually to obtain MRT. However, since even those similar surfaces are not the same, it can lead to erroneous MRT estimation, which needs to be investigated. This study analyzes the uncertainty of MRT estimates by categorizing the surfaces with similar temperature behaviors to examine the risk of such inaccuracy. In this study, the input data required for the MRT calculation are generated using a measurement data...

Research paper thumbnail of Development and Implementation of Photovoltaic Integrated Multi-Skin Façade (PV-MSF) Design Based on Geometrical Concepts to Improve Building Energy Efficiency Performance

Sustainability

This study presents the influence of multi-skin façade (MSF) design with photovoltaic (PV) system... more This study presents the influence of multi-skin façade (MSF) design with photovoltaic (PV) systems on the thermal behaviors and power generation potential when installed on the entire southern façade of an office building model. This study considers various flexible changes in MSF system design based on geometrical concepts. For the simulation model development, this study uses the medium-sized prototype office building model, developed based on the ASHRAE 90.1-2019. A total of 24 different patterns are created based on a pyramid configuration: triangular pyramid (TP) and rectangular pyramid (RP). Changing the tilt angle for PV integrated surfaces is the main method used to compare the power generation efficiency of different MSF configurations. Results from this analysis indicate that the proposed PV-integrated MSF system with generated patterns tends to reduce cooling and heating demands. The system also presents increased PV power generation performance compared to vertically ins...

Research paper thumbnail of The Assessments of Operational Performance for North-facing PV System based on Measured Data

Journal of the Korean Solar Energy Society

Photovoltaic (PV) systems are commonly used as on-site electric power generators for ZEBs in the ... more Photovoltaic (PV) systems are commonly used as on-site electric power generators for ZEBs in the Republic of Korea. To enhance the performance of PV systems, considering efficient installation conditions, such as the optimal azimuth and tilt angles, is critical. Under domestic PV application guidelines, the azimuth of installation for building-applied PV systems is stipulated within a maximum of ±90° based on the south-facing direction. In general, the northfacing direction is known as a weak position for PV systems. However, several studies have shown that the north-facing direction can be a good option for building PV installations, typically when the installation areas are limited within a building site. Even if the PV panel faces north, the system can operate effectively with proper performance when installed at a suitable inclination angle. In existing studies, system behavior has been verified based on simulationbased analysis, but actual operational data analysis remains insufficient. This study aims to evaluate the feasibility of north-facing PV systems based on a performance evaluation of the measured data of a roof PV system. The roof PV system analyzed in this study was composed of modules, module-level power electronics (MLPE), and one inverter. The PV modules and MLPEs were installed on both the southern (SIR) and northern (NIR) inclined roofs. Based on the annual cumulative DC power, the energy yields of the MLPE connected to modules of the SIR and NIR are 1,445.0 and 1,068.7 kWh/kWp, respectively. Our study found that the ratio of the performance of MLPE on the NIR to MLPE on the SIR was 74.0%. This ratio was similar to the energy yield of the PV system on the south vertical plane as compared to that on the south slope plane. The analyzed results revealed that an acceptable performance of the PV system installed on a northern slope at a suitable inclination angle could be expected as compared with other PV installations such as the southern vertical.

Research paper thumbnail of Heat Flux and Thermal Characteristics of Electrically Heated Windows: A Case Study

Sustainability, 2022

Energy loss through windows can be high relatively compared to other opaque surfaces because insu... more Energy loss through windows can be high relatively compared to other opaque surfaces because insulation performance of fenestration parts is lower in the building envelope. Electrically heated window systems are used to improve the indoor environment, prevent condensation, and increase building energy efficiency. The purpose of this study is to analyze the thermal behaviors of a heated window under a field experiment condition. Experiments were conducted during the winter season (i.e., January and February) with the energy-efficient house that residents occupy. To collect measured data from the experimental house, temperature and heat flux meter sensors were used for the analysis of heat flow patterns. Such measured data were used to calculate heat gain ratios and compare temperature and dew point distribution profiles of heated windows with input power values under the changed condition in the operating temperature of the heated glazing. Results from this study indicated that the i...

Research paper thumbnail of Comparative investigation on building energy performance of double skin façade (DSF) with interior or exterior slat blinds

Journal of Building Engineering, 2018

Advanced passive control technologies attract a great deal of attention by architects and enginee... more Advanced passive control technologies attract a great deal of attention by architects and engineers as a way of achieving both high indoor environmental quality and energy efficient buildings. This study investigates the thermal and daylighting effects of a double skin façade (DSF) system with interior and exterior blinds. A buffer type DSF and slat type blinds are used for this comparative study. To investigate thermal and daylighting effects of three passive control models, evaluation of annual heating, cooling, and lighting loads is conducted using a widely-accepted whole building energy modeling program, EnergyPlus. A simulated DSF model is developed using the air-flow network (AFN) model in EnergyPlus and calibrated against measured data from an experimental DSF facility installed to an office building in Daejeon, South Korea. After a proper calibration of the simulated DSF model, the impact of blinds in the cavity of the DSF is also evaluated by adopting a slat blind model in EnergyPlus. For exterior and interior blind models, the simulated DSF model is modified by removing a DSF box and adding slat blinds at inner and outer surfaces of the windows. A Radiancebased daylighting simulation program, Daysim, is used to evaluate daylighting aspects of blinds and lighting controls within an office building with simulated DSF, interior blind, and exterior blind models. Generated lighting and blind raise/lower control schedules from Daysim are used as input values in EnergyPlus for annual thermal and lighting load calculations. In addition, the impact of natural ventilation to reduce trapped hot air within the cavity of the DSF box is considered in this study during a cooling period only for the DSF model. Results indicate that the simulated DSF model can save up to 40%, 2%, and 5% for heating, cooling, and total loads, respectively, when compared to the baseline (i.e., No passive technologies) without any blinds or controls. With the combination of the daylight-based dimming control based on the indoor illuminance levels and the blind raise/lower control, the simulated DSF and the exterior blind models could potentially reduce the building thermal loads and lighting energy consumption, ranging around 27% to 52%.

Research paper thumbnail of Evaluation of Daylighting Performance and Design of a Curved-Lightshelf by the Ray Tracing Method

Journal of the Korean Solar Energy Society, 2011

* De p t .o fAr c h i t e c t u r a lE n g ,Gr a d u a t eS c h o o lHa n b a tNa t i o n a lUn i... more * De p t .o fAr c h i t e c t u r a lE n g ,Gr a d u a t eS c h o o lHa n b a tNa t i o n a lUn i v e r s i t y (t a c q t a c @n a v e r. c o m) , * * De p t .o fAr c h i t e c t u r a lE n g ,Ha n b a tNa t i o n a lUn i v e r s i t y (j h y o o n @h a n b a t. a c. k r) , * * * De p t .o fAr c h i t e c t u r a lE n g ,Da e j e o nUn i v e r s i t y (S h i n u c @d j u. a c. k r) , * * * * De p t .o fAr c h i t e c t u r a lE n g ,Ha n b a tNa t i o n a lUn i v e r s i t y (k wh l e e @h a n b a t. a c. k r) Ke y wo r d s: 자연채광(Da y l i g h t) , 곡면형-광선반(C u r v e d-L i g h t s h e l f) , 시뮬레이션(S i mu l a t i o n) , 실내조도(I n d o o rI l l u n i ma c e) , 휘도

Research paper thumbnail of A Study on the Optimum Application Method of Solar Thermal System to reduce Thermal Load and Carbon Emission in Apartment Building

Journal of the Korean Solar Energy Society, 2011

Research paper thumbnail of Thermal Performance Analysis for Optimal Operation of Solar Hot Water System

Journal of the Korean Solar Energy Society, 2011

Research paper thumbnail of Heating and Cooling Energy Performance Analysis of Residential Building with TI-Wall System

한국태양에너지학회 2004 Proceedings Isea Asia Pacific, Oct 1, 2004

In previous study, heating and overheating performance was carried out through test-cell measurem... more In previous study, heating and overheating performance was carried out through test-cell measurement used by TI-wall(Transparent Insulation) system and mass-wall system and the optimum composition of TI-wall system was proposed by simulation analysis in the Korean weather condition. The aim of this study was to analysis the heating and cooling performance following the optimum configuration of TI-wall used in residential building. The process of this study is as follows: 1) The ESP-r simulation program was used in energy performance analysis and the reference model of residential building was made up to analysis energy performance on Ti-wall and mass-wall system. 2) Standard weather file of Seoul, Daejeon and Cheju was made that was the format of simulation program(ESP-r). 3) The regional heating and cooling energy performance was carried out by using regional standard weather file of TI-wall and mass-wall system in residential building and the reduction of heating and cooling energy with the change of wall size of per system was analyzed. 4) The energy reduction of TI- wall system of foreign country was compared with that of Korean.

Research paper thumbnail of An Analysis of Electricity Consumption Profile based on Measurement Data in Apartment Complex in Daejeon

Kieae Journal, 2011

This study is to analysis the characteristics of electric power consumption of apartments complex... more This study is to analysis the characteristics of electric power consumption of apartments complex in Korea. This study shows the pattern of electric power consumption and correlation of each apartment complex's completion year monthly and timely. With this result, we are able to predict the demand pattern of electricity in a house and make the schedule by demand pattern. It is expected this data is used as reference of electric consumption of Daejeon area to operate the simulation tools to predict the building energy. The yearly data of 10 apartment complexes of 2010 are analyzed. The results of this study are followed. The averaged amount of electricity consumption in winter is higher as summer because of the high capacity of heating equipment. All of the house has electric base load from 0.26kWh to 0.5kWh. The average of the electricity consumption of month is shown as 310.2kWh. A week is seperated, as 4 part such as week, weekend, Saturday and Sunday. During week, the average of timely electricity consumption is shown as 0.426kWh. The Saturday consumption is 0.437kWh. The Sunday is 0.445kWh. The peak electricity consumption in summer and winter is measured. The peak consumption on summer season is 1.389kW on 22th August 64% higher than winter season 0.887kW on 3rd January.

Research paper thumbnail of Lighting Apparatus Using Solar Cell

Research paper thumbnail of Energy Performance Evaluation of Low Energy Houses using Metering Data

Korean Journal of Air-Conditioning and Refrigeration Engineering, 2015

This study analyzed analyzes the energy performance of six houses in Daejeon completed which were... more This study analyzed analyzes the energy performance of six houses in Daejeon completed which were built in 2011. Observed The observed houses, which were all designed and constructed inof the same size and structure, are were highly insulated with triple Low-E coating windows; the insulation level of the walls is was 0.13 W/㎡K and that of the roof is was 0.10 W/㎡K. As electric houses, all of the energy supplied to the houses, including for cooking, is was supplied by electricity. A and 3~4 kWp of photovoltaic system and a 3~5 kW of ground source heat pump (GSHP) were installed in each house tofor providing provide space heating/and cooling and hot water are installed. We constructed a Web-based remote monitoring system in order to understand energy consumption and the dynamic behavior of the energy system. T, and the results of our metering data analysis of 2013 are as follows. First, the annual residential energy consumption is was 4,400 kWh (σ = 1,209) and GSHP energy consumption is was 5,182 kWh (σ = 1,164). Second, residential energy consumption ranked highest in average energy usage, with at 45% of the total, followed by heating with at 30%, hot water supply with at 17% and cooling with at 6%. Third, the average energy independence rate is was 51.8%, the GFA (Gross gross floor area) criteria average energy consumption unit is was 48.7 kWh/㎡yr (σ = 10.1), and the net energy consumption unit (except the energy yield of the PV systems) is was 24.7 kWh/㎡yr (σ = 8.8).

Research paper thumbnail of Power Performance Characteristics of Transparent Thin-film BIPV Module depending on an installation angle

This study has analysed power output characteristics of transparent thin-film PV module depending... more This study has analysed power output characteristics of transparent thin-film PV module depending on incidence angle and azimuth. The experiment results showed power outputs of transparent thin-film PV module applied to full-scale mock up model on slope of to the south. The simulation results was evaluated power outputs of transparent thin-film PV module depending on incidence angle and azimuth after calibrating the experimental and computed data. As a result. the best power output performance of transparent thin-film PV module was obtained at slope of to the south, producing the annual power output of 977kWh/kWp. The annual power output data demonstrated that the PV module with a slope of could produce a 68 % higher power output than that with a slope of with respect to the inclined slope of the module, Furthermore, the PV module facing south showed a 22 % higher power output than that facing to the east in terms of the angle of the azimuth, Specipically. the varying power output w...

Research paper thumbnail of Case Study on 5kWp Transparent Thin-Film BIPV System

This study has been carried out empirical research on Transparent Thin-film BIPV modules, BIPV mo... more This study has been carried out empirical research on Transparent Thin-film BIPV modules, BIPV modules installed on the exterior of the building are applied a laminated module 1kWp, double-glazing module 3kWp and triple-glazing module 1kWp. Applied to the total capacity of BIPV modules are 5kWp. In this study, design and construction process of BIPV systems is presented. In addition, through monitoring of the BIPV system, the temperature and the power characteristics of each module were analyzed. During the measurement period, the module temperature measurement results, the maximum surface temperature of triple-glazing BIPV module showed the highest, followed by double-glazing BIPV module , laminated modules, respectively. Power output results, the daily average double-layer modules showed 4.10kWh/day, triple-glazing module 1.57kWh, respectively 1.81kWh laminated modules. In particular, the power efficiency of triple-glazing BIPV module was lower than the power efficiency of the lam...

Research paper thumbnail of A Case Study of Electric Power Consumption Characteristics in University Building

Journal of the Korean Solar Energy Society, 2012

* De p t .o fAr c h i t e c t u r a lGr a d u a t eS c h o o l ,Da e j e o nUn i v e r s i t y (l... more * De p t .o fAr c h i t e c t u r a lGr a d u a t eS c h o o l ,Da e j e o nUn i v e r s i t y (l wj 3 1 1 6 @d j u. k r) , * * Cl i ma t eCh a n g eRe s e a r c h Di v i s i o n ,Na t i o n a l I n s t i t u t eo fEn v i r o n me n t a lRe s e a r c h , Ko r e a (e x 1 2 @k o r e a. k r) * * * C l i ma t eC h a n g eR e s e a r c hDi v i s i o n ,Na t i o n a l I n s t i t u t eo fE n v i r o n me n t a lR e s e a r c h , Ko r e a (g e r c l i b @k o r e a. k r) * * * * De p t .o fAr c h i t e c t u r a lE n g ,Ha n b a tNa t i o n a lUn i v e r s i t y (j h y o o n @h a n b a t. a c. k r) , * * * * * De p t .o fAr c h i t e c t u r a lE n g ,Da e j e o nUn i v e r s i t y (s h i n u c @d j u. k r)

Research paper thumbnail of A Study on generation characteristics of building integrated Photovoltaic system

Journal of the Korean Solar Energy Society, 2013

P a r kJ a e-Wa n * ,S h i nU-C h e u l-* * †a n dK i m D a eGo n * * * ,Y o o nJ o n g-H o * * *... more P a r kJ a e-Wa n * ,S h i nU-C h e u l-* * †a n dK i m D a eGo n * * * ,Y o o nJ o n g-H o * * * * (S u b mi td a t e :2 0 1 3 .4 .1 0. J u d g me n td a t e :2 0 1 3 .4 .1 5. P u b l i c a t i o nd e c i d ed a t e :2 0 1 3 .6 .2 4 .) Abstract:I nt h i ss t u d y ,wea n a l y z et h ep e r f o r ma n c ec h a r a c t e r i s t i c so fBu i l d i n gI n t e g r a t e dP h o t o v o l t a i c(BI P V) s y s t e m o fK Re s e a r c h Bu i l d i n g wh i c h wa sd e s i g n e dwi t h t h ea i m o fz e r oc a r b o n b u i l d i n g .I n a d d i t i o n ,BI P V s y s t e m,wh i c h i s c o n s i s to ft h r e e mo d u l e s ;G t o G(Gl a s s t o Gl a s s) ,G t o T(Gl a s s t o Te d l a r / C r y s t a l)a n d Amo r p h o u s ,h a s1 1 6. 2 k Wpo ft o t a lc a p a c i t y ,a n di sa p p l i e dt owa l l ,wi n d o w,a t r i u m a n dp a g o r ao nr o o f .

Research paper thumbnail of Calibration Procedure for Energy Performance Simulation of a Commercial Building

Journal of Solar Energy Engineering, 2003

Calibration of an energy simulation with actual data has generally been considered too difficult ... more Calibration of an energy simulation with actual data has generally been considered too difficult to be part of the energy audit procedure. The purpose of this paper is to develop a systematic method using a “base load analysis approach” to calibrate a building energy performance model with a combination of monthly utility billing data and sub-metered data such as is commonly available in large buildings in Korea. The calibration procedure was specifically developed to be suitable for use in both the audit and savings determination procedure within a retrofit process. The procedure has been visualized using a logical flow chart and demonstrated using the simulation of a 26-story commercial building located in Seoul as a case study. The results indicate that the approach developed provided a reliable and accurate simulation of the monthly and annual building energy requirements of the case study building.

Research paper thumbnail of Annual Base Performance Evaluation on Cell Temperature and Power Generation of c-Si Transparent Spandrel BIPV Module depending on the Backside Insulation Level

Journal of the Korean Solar Energy Society, 2012

Research paper thumbnail of The Prediction of Maximum Power Point Base on Artificial Neural Network for Maintenance of Building Applied Photovoltaic System

Journal of the Korean Solar Energy Society, 2021

To achieve the greatest performance, photovoltaic (PV) systems need to be continuously monitored ... more To achieve the greatest performance, photovoltaic (PV) systems need to be continuously monitored for fault detection and diagnosis, which could affect their performance under operational conditions. Various fault detection and diagnosis methods have been developed to improve these technologies. For example, the "Voltage and Current Measurement Method" based on the One-Diode model has been widely adopted in many case studies to predict a maximum power point (i.e., power, current, and voltage) and then detect any issues that occur under harsh outdoor conditions. Although the One-Diode model has demonstrated accurate performance for fault detection and diagnosis, the accuracy has typically been limited to crystalline PV modules. To overcome this limitation, many fault diagnosis methods have been proposed, and machine-learning fault detection and diagnosis methods are effective alternatives because of the nonlinear output features and varying operating conditions of PV arrays. Therefore, this study presents the prediction model of maximum power point (MPP) using artificial neural network (ANN) algorithms. The prediction model of MPP was generated through an optimization analysis. The MPP was validated by using measured data obtained from a building attached to a PV (BAPV) system in Korea. The results of the optimization study showed the highest predictive accuracy when the structure of the ANN model was trained and learned with one hidden layer, 20 neurons per hidden layer, a sigmoid function, and an 0.01 learning rate. The coefficient of variation of RMS error (CvRMSE) between the predicted value and the labelled value was 3.14%. The prediction model for MPP was verified by using the measured data. The analysis of the measured and predicted values resulted in CvRMSE values of 11.66%, 11.70%, and 18.01% for power, current, and voltage, respectively.

Research paper thumbnail of The State of the Art in BIPV Technology

Journal of the Korean Institute of Electrical and Electronic Material Engineers, 2014

The current downturn of BIPV sector has an enormous potential to rebound and expand into the PV s... more The current downturn of BIPV sector has an enormous potential to rebound and expand into the PV sector for construction market in the foreseeable future. Solar technology has already gained a significant market due to lack of natural resources in the Korean domestic market. Given the technical infrastructure of state-of-the-art fusion technology, the competitiveness of software-driven BIPV market in the world can be ver attractive and have the potential to develop as a key national technology. To do this, from the viewpoint of complexity, technical R&D, national political aspect, social aspect, economic aspect and institutional support systems need to be parallelly formulated. A dedicated BIPV sector has not yet been established, especially policy and institutional framework have very crucial impact on the establishment of BIPV sector.