Chanikarn Yimprayoon | Kasetsart University (original) (raw)

Papers by Chanikarn Yimprayoon

ARCC Conference Repository, 2011

Building energy simulation plays an important role in decision makings involving energy conservat... more Building energy simulation plays an important role in decision makings involving energy conservation measures and choices of renewable energy systems in building designs. Traditional simulation tools rely on weather data sets called Typical Meteorological Year (TMY), representing a typical year of weather at ground weather stations throughout the United States. These data sets are constructed using an algorithm to select the "most typical" month of the many years in the database for each month. Some recent publications suggest that one-year TMY data is no longer sufficient to evaluate long-term performance of PV systems, because a typical year does not taken into account extreme weather, and thus does not address the meteorological uncertainty that might occur. Actual electricity outputs from photovoltaic systems vary from year to year. Having more accurate information about production performance should help facilitate system selections that match building designs and how to operate them. In this study, four sets of weather data, Detroit TMY2, Ann Arbor TMY3, Ann Arbor 15-year NSRDB, and Ann Arbor 13-year SolarAnywhere®, are used as inputs in PV system performance simulation. Their impacts on the PV system electricity output availability, variability and uncertainty are analyzed and compared. The magnitude and consequences of the analyses of different weather data sets are presented.

Zero Energy Building (ZEB) is a building designed to make use of natural free resources in order ... more Zero Energy Building (ZEB) is a building designed to make use of natural free resources in order to reduce energy use in building, install energy efficient systems, and generate energy from renewable sources equal to or more than energy used in the project. Medium and large scale, cost effective zero energy buildings are expected to be viable in the next 15-20 years. However, rapid building technology development and determined building owners and designers had made medium and large scale buildings become successful today. This paper explored design guidelines applicable for zero energy building in Thailand and demonstrate that cost effective and repeatable zero energy buildings could be possible. Future research opportunities in the field of zero energy building design in the tropic are also identified.

Proceedings of SimBuild, 2010

IOP conference series, Nov 21, 2020

Nakhara : Journal of Environmental Design and Planning, Jun 30, 2022

Multilayer materials of built-in furniture components emit volatile organic compounds (VOCs) into... more Multilayer materials of built-in furniture components emit volatile organic compounds (VOCs) into the indoor environment. Although many green building rating systems have set criteria for indoor environments, typical buildings in Thailand have not implemented these requirements, especially for local furniture. This study aimed to identify the magnitude of VOC emissions and the relationships between these VOC emissions and inner structures, finishing techniques used for built-in components, and the cost of interior built-in furniture built by local contractors. A total of 33 specimens of built-in components normally found in Thailand were prepared and wrapped in plastic before being transported to the test facility. The total volatile organic compound (TVOC) and formaldehyde (HCHO) emission rates were measured using emission test chambers, as per the ISO 16000-9 standard, with a size of 0.21 m³, at a temperature of 23 °C, a relative humidity of 45%, an air exchange rate of 0.5 ACH, and a loading factor of 0.42 m²m-³. The measurements were conducted 3 days and 28 days after the specimens were unwrapped. It was found that specimens finished with coating techniques had the highest TVOC and HCHO emission rates, while those with single-layer materials that used covering techniques had the lowest TVOC and HCHO emission rates. The covering techniques were found to be cheaper but less durable than coating techniques. All specimens exhibited high emission concentrations in the chambers (i.e., more than the standard limit) even after 28 days. This should help raise awareness of the importance of selecting built-in furniture based on finishing techniques that make use of low-VOC materials, which are available on the market and provide better indoor air quality.

Applied Mechanics and Materials, Aug 1, 2013

Grid-connected photovoltaic (PV) system efficiency can be maximized with building demand matching... more Grid-connected photovoltaic (PV) system efficiency can be maximized with building demand matching. Computer simulations were used to investigate the priorities of energy efficient measures commonly used in residential and commercial buildings in Thailand that decreased the electricity demand while producing load profiles that matched the unique output profiles from PV systems. Residential and commercial buildings in Thailand were modeled in existing conditions. Then they were made compliant with ASHRAE energy standard requirements which can reduce electricity consumption 16-36% in residential buildings and 8-19% in commercial buildings. With energy efficient design measures, electricity production from PV systems could satisfy the remaining consumption and peak electricity demand reduction could reach up to 70% in residential buildings. Electricity consumption and peak demand reduction in commercial buildings was not high. Reducing lighting power density in residential buildings, using higher glazing efficiency in small offices and using thermal mass in big offices were found to be able to reduce more peak load when electricity output from PV systems were incorporated in the buildings compared with other measures. Energy efficient design measures suitable for different purposes in each building type have been identified. Building owners and electricity utilities can use this information to select the best energy efficient design measures that fit their objectives.

The use of photovoltaic (PV) systems on buildings has increased in the last few decades due to de... more The use of photovoltaic (PV) systems on buildings has increased in the last few decades due to decreasing price and growing concern about non-renewable energy usage. Photovoltaic technology provides renewable energy to utility grids while also reducing reliance on the grids. Several incentive, rebate and net metering programs help make PV systems more affordable. In the United States, homes account for 37% of all electricity use and 22% of all primary energy consumption. This significant impact on energy usage makes it necessary to shift toward more environmentally responsible sources of energy. Existing residential buildings can play a significant role in deploying photovoltaic technology. This study demonstrates a potential deployment of PV systems on housing in a northern climate where people usually believe that solar irradiation is insufficient to make PV systems feasible. The results show that, with available incentive programs and other system benefits, PV systems can compete with purchasing electricity from the grids. However, more incentive programs or the integration of PV systems into building skins could make the investment return more favorable.

Procedia Engineering, 2011

Facade and roof greenings enhance thermal comfort in building environment both indoor and outdoor... more Facade and roof greenings enhance thermal comfort in building environment both indoor and outdoor by reducing heat transfer to and from building envelope. They shade buildings from solar radiation, absorb solar radiation for photosynthesis and evapo-transpiration, reduce solar reflection and re-radiation to atmosphere. Green façade and roof has been included as one of major green building evaluation criteria for many sustainable cities in the world nowadays. This research aims to study the use of climbing plants as vertical shading devices, "biofacade", for naturally ventilated building with windows facing west. Blue trumpet vine (Thunbergia grandiflora) was selected due to its fast growth and consistently full leave coverage. Two experiments were carried out to compare air temperature of a room with biofacade and a room without. Natural ventilation were added to both rooms and the thermal performances were compared. It has been found that biofacade performance increased when room air velocity was high from the case with natural ventilation. The room air temperature was reduced from outside ambient air temperature to the maximum of 9.93 °C, with an average of 3.63 °C during day time (9:00 a.m.-8:30 p.m.). When air velocity was low, the temperature difference had maximum of 6.72 °C, average of 0.91 °C lower than normal room. At night (9:00 p.m.-8:30 a.m.), however, biofacade had slightly higher air temperature than normal room and outside ambient air in both cases. Unexpectedly, leaves of the selected climbers did not obstruct wind when cross ventilation was provided and air velocity inside room with biofacade was higher than room without biofacade especially in the daytime. Besides, in tropical climate, air behind leaves always maintain lower temperature than ambient air temperature, which is different from research in temperate climate where air behind leaves can sometime obtain higher temperature. From the 2 experiments, the room temperature with biofacade reduced significantly but still could not reach comfort zone (22-28 °C) during the day time. However, the application can be recommended to use for pre-cooling the fresh air-intake of air conditioning systems, so it can help reduce cooling load efficiently.

Nakhara : Journal of Environmental Design and Planning, Jun 30, 2022

Procedia Engineering, 2011

Building energy simulation plays an important role in decision makings involving energy conservat... more Building energy simulation plays an important role in decision makings involving energy conservation measures and choices of renewable energy systems in building designs. Traditional simulation tools rely on weather data sets called Typical Meteorological Year (TMY), representing a typical year of weather at ground weather stations throughout the United States. These data sets are constructed using an algorithm to select the “most typical” month of the many years in the database for each month. Some recent publications suggest that one-year TMY data is no longer sufficient to evaluate long-term performance of PV systems, because a typical year does not taken into account extreme weather, and thus does not address the meteorological uncertainty that might occur. Actual electricity outputs from photovoltaic systems vary from year to year. Having more accurate information about production performance should help facilitate system selections that match building designs and how to operat...

Residential buildings can play a significant role in deploying solar technology using their rooft... more Residential buildings can play a significant role in deploying solar technology using their rooftops. However, shading from trees and surroundings can limit the access of solar radiation to the building. To correctly quantify the effect of shading cast by trees and nearby buildings for medium to large projects, the method of utlizing Light Detection And Ranging (LiDAR) and orthophotograph maps to measure obstruction heights and locations for three-dimensional modeling is presented. Rooftop shadows from houses in a neighborhood are simulated and analyzed to quantify the amount of solar reduction due to the surroundings at the present time and in the future.

Reduce load Optimum size? Item Details References Wall Construction layers  Wood frame 2x6, 16 i... more Reduce load Optimum size? Item Details References Wall Construction layers  Wood frame 2x6, 16 in o.c.  Wood/plywood  1 in polystyrene (R4)  Insulation o Miami R-0 (U= 0.089) o Houston,

Applied Mechanics and Materials, Oct 10, 2013

Applied Mechanics and Materials, 2013

Facade and roof greenings enhance thermal comfort in building environment both indoor and outdoor... more Facade and roof greenings enhance thermal comfort in building environment both indoor and outdoor by reducing heat transfer to and from building envelope. They shade buildings from solar radiation, absorb solar radiation for photosynthesis and evapo-transpiration, reduce solar reflection and re-radiation to atmosphere. Green façade and roof has been included as one of major green building evaluation criteria for many sustainable cities in the world nowadays. This research aims to study the use of climbing plants as vertical shading devices, "biofacade", for naturally ventilated building with windows facing west. Blue trumpet vine (Thunbergia grandiflora) was selected due to its fast growth and consistently full leave coverage. Two experiments were carried out to compare air temperature of a room with biofacade and a room without. Natural ventilation were added to both rooms and the thermal performances were compared. It has been found that biofacade performance increased when room air velocity was high from the case with natural ventilation. The room air temperature was reduced from outside ambient air temperature to the maximum of 9.93 °C, with an average of 3.63 °C during day time (9:00 a.m. -8:30 p.m.). When air velocity was low, the temperature difference had maximum of 6.72 °C, average of 0.91 °C lower than normal room. At night (9:00 p.m. -8:30 a.m.), however, biofacade had slightly higher air temperature than normal room and outside ambient air in both cases. Unexpectedly, leaves of the selected climbers did not obstruct wind when cross ventilation was provided and air velocity inside room with biofacade was higher than room without biofacade especially in the daytime. Besides, in tropical climate, air behind leaves always maintain lower temperature than ambient air temperature, which is different from research in temperate climate where air behind leaves can sometime obtain higher temperature. From the 2 experiments, the room temperature with biofacade reduced significantly but still could not reach comfort zone (22-28 °C) during the day time. However, the application can be recommended to use for pre-cooling the fresh air-intake of air conditioning systems, so it can help reduce cooling load efficiently.

ARCC Conference Repository, 2011

Proceedings of SimBuild, 2010

IOP conference series, Nov 21, 2020

Nakhara : Journal of Environmental Design and Planning, Jun 30, 2022

Applied Mechanics and Materials, Aug 1, 2013

Procedia Engineering, 2011

Nakhara : Journal of Environmental Design and Planning, Jun 30, 2022

Procedia Engineering, 2011

Building energy simulation plays an important role in decision makings involving energy conservat... more Building energy simulation plays an important role in decision makings involving energy conservation measures and choices of renewable energy systems in building designs. Traditional simulation tools rely on weather data sets called Typical Meteorological Year (TMY), representing a typical year of weather at ground weather stations throughout the United States. These data sets are constructed using an algorithm to select the “most typical” month of the many years in the database for each month. Some recent publications suggest that one-year TMY data is no longer sufficient to evaluate long-term performance of PV systems, because a typical year does not taken into account extreme weather, and thus does not address the meteorological uncertainty that might occur. Actual electricity outputs from photovoltaic systems vary from year to year. Having more accurate information about production performance should help facilitate system selections that match building designs and how to operat...

Applied Mechanics and Materials, Oct 10, 2013

Applied Mechanics and Materials, 2013

Facade and roof greenings enhance thermal comfort in building environment both indoor and outdoor... more Facade and roof greenings enhance thermal comfort in building environment both indoor and outdoor by reducing heat transfer to and from building envelope. They shade buildings from solar radiation, absorb solar radiation for photosynthesis and evapo-transpiration, reduce solar reflection and re-radiation to atmosphere. Green façade and roof has been included as one of major green building evaluation criteria for many sustainable cities in the world nowadays. This research aims to study the use of climbing plants as vertical shading devices, "biofacade", for naturally ventilated building with windows facing west. Blue trumpet vine (Thunbergia grandiflora) was selected due to its fast growth and consistently full leave coverage. Two experiments were carried out to compare air temperature of a room with biofacade and a room without. Natural ventilation were added to both rooms and the thermal performances were compared. It has been found that biofacade performance increased when room air velocity was high from the case with natural ventilation. The room air temperature was reduced from outside ambient air temperature to the maximum of 9.93 °C, with an average of 3.63 °C during day time (9:00 a.m. -8:30 p.m.). When air velocity was low, the temperature difference had maximum of 6.72 °C, average of 0.91 °C lower than normal room. At night (9:00 p.m. -8:30 a.m.), however, biofacade had slightly higher air temperature than normal room and outside ambient air in both cases. Unexpectedly, leaves of the selected climbers did not obstruct wind when cross ventilation was provided and air velocity inside room with biofacade was higher than room without biofacade especially in the daytime. Besides, in tropical climate, air behind leaves always maintain lower temperature than ambient air temperature, which is different from research in temperate climate where air behind leaves can sometime obtain higher temperature. From the 2 experiments, the room temperature with biofacade reduced significantly but still could not reach comfort zone (22-28 °C) during the day time. However, the application can be recommended to use for pre-cooling the fresh air-intake of air conditioning systems, so it can help reduce cooling load efficiently.