Comparative Economic and Experimental Assessment of Air Source Heat Pump and Gas-Fired Boiler: A Case Study from Turkey (original) (raw)
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Energies
This study quantifies the potential of a 4.0 kW air source heat pump (ASHP) unit retrofitted to a 12.0 kW, 1000 L electric boiler coupled to a 1000 L storage tank. A data acquisition system was built to monitor the performance of the electric boiler and the ASHP water heater. The annual electrical energy saving and the load factor reduction from the electric boiler because of the ASHP unit retrofit was 34,805.94 kWh and 0.124. The net present value payback period of the ASHP system was 1.60 years. A Wilcoxon rank sum test was employed to compare both the volumes of hot water and electrical energy consumed by the two systems. Linear regression models of the daily volumes of hot water and electrical energy consumed by both systems were established. The results should be of great value to the management of universities that are considering energy-efficient interventions with a significant return on investment.
Heat Pumps and Cost Optimal Building Performance
European Scientific Journal, 2014
Slovenia has established comparative methodology framework for the minimum energy performance requirements on the basis of article 5 of the Directive EPBD-Recast (2010/31/EU) and in accordance with Annex III, differentiating between different categories of buildings. Choosing a single family house, energy performance of the buildings was calculated with IDA Indoor Climate and Energy as a whole year detailed and dynamic multizone simulation study of indoor climate and energy use. The minimum energy performance requirements are represented by the area of the cost curve that delivers the lowest cost for the end-user and society. The results demonstrate that the minimum requirements set for new single family houses in national building codes in force are more severe than the minimum requirements corresponding to the cost optimal level, mainly due to the national energy and climate policy targets in the building sector. Among systems, heat pumps proved to be important competitors in seeking the cost optimal building performance. It was shown, that heat pumps are environmentally acceptable and economically efficient way of heating with plausible positive social multiplied effects. Heat pumps have support of local economy and are based on well-established technology, their operational is efficient, reliable and are suitable for almost all buildings. In the future it is expected to reach higher coefficient of performance (COP), especially at lower temperatures. Higher COP, together with further increase of renewables share in national electrical power system is making heat pumps important foundation for further sustainable development in line with sustainable principles.
Science, Technology and Innovation, 2018
The subject of the research was an air-water heat pump, model PCUW 2.5kW from HEWALEX, installed in a single-family house. The pump is only used for heating water. The research was carried out from 25-08-2017 to 18-09-2017 in the village of Zborowice, in Malopolska region, Poland. The data were recorded from the heat pump system: temperature of the lower heat source (external air), temperature of the upper heat source (water temperature in the tank), time of heat pump was calculated during the analysed cycle of work and electrical energy consumption. The Coefficient Of Performance (COP) of the analysed air-water heat pump was determined. The analysis of the results was carried out using the MATLAB and EXCEL statistical tools. The correlation between COP coefficient and external air temperature is strong: 0.67.
Journal of Energy in Southern Africa, 2021
Air source heat pump (ASHP) water heaters are efficient devices for sanitary hot water heating. The coefficient of performance (COP) of the air to water heat pump (AWHP) is constantly lower than that of the corresponding ASHP unit. The study focused on determining the COP of both the ASHP unit and the AWHP. This was achieved by the implementation of both experimental and simulation methods, with the help of a data acquisition system and the REFPROP software. The system comprised of a 1.2 kW split type ASHP unit and a 150 L high pressure geyser. A power meter, flow meters, temperature sensors, pressure sensors, ambient temperature and relative humidity sensor were installed at precise locations on the split type AWHP. Controlled volumes of 150, 50 and 100 L were drawn off from the AWHP during the morning, afternoon and evening for a year. The average COP for the summer and winter, in terms of the input electrical and output thermal energies of the AWHP were 3.02 and 2.30. The COPs of...
Energy Procedia, 2017
The space heating of buildings represents one of the most important causes of energy consumption in Europe. The necessity to increase the share of renewable energy within the sector is hindered by the difficulty to renew and refurbish the existing building stock. In this context, heat pumps can have an important role in helping increase the renewable share of thermal energy production for the civil sector, in particular in those countries in which the electricity generation mix has large contributions from renewable energy sources. The paper presents a real-data analysis and a numerical simulation to evaluate the opportunity to substitute traditional heat generation systems (natural gas boilers) with air-source heat pumps or hybrid solutions. Three buildings located in Turin (Italy) are taken as case-study, and the hourly profiles of outdoor temperature, water supply temperature and absorbed thermal power are used to simulate four heat generation scenarios, that are compared in terms of primary energy consumption. Results show that (1) the substitution of the traditional natural gas boiler with a heat pump (with backup electric resistance) is always favorable (18% to 32% of primary energy reduction); (2) the influence of water supply temperature of each building on the overall primary energy saving is very high; (3) the adoption of a hybrid system (heat pump and natural gas boiler working alternatively) provides advantages in terms of reduced primary energy consumption only if the required supply water temperature is high. Further studies will investigate the economic aspects and will introduce comparisons with condensation natural gas boilers.
Renewable Energy, 2015
In this study, the economic and environmental feasibility of air-to-air and geothermal heat pump systems is examined. The significance of the insulation level of the envelope on the economic and environmental feasibility of heat pump systems is demonstrated. The goal of this study is to quantify the extent to which the local climate and the building insulation level influences the economic and environmental feasibility of a geothermal water-to-air heat pump system and an external air-to-air heat pump system. In this study, the seasonal coefficient of performance SCOP is predicted for both heat pump systems for a residential building with varying insulation levels representative locations of the United States. The SCOP of both heat pump systems is calculated in a dynamic calculation process for use in a representative residential building with three different insulation levels of the building envelope. Results show a huge sensibility of SCOP values and feasibility studies towards the insulation level of the building envelope and the location.
Exergetic And Sustainability Evaluation Of A Building Heating System In Izmir, Turkey
2014
Heating, cooling and lighting appliances in buildings<br> account for more than one third of the world's primary energy<br> demand. Therefore, main components of the building heating systems<br> play an essential role in terms of energy consumption. In this context,<br> efficient energy and exergy utilization in HVAC-R systems has been<br> very essential, especially in developing energy policies towards<br> increasing efficiencies. The main objective of the present study is to<br> assess the performance of a family house with a volume of 326.7 m3<br> and a net floor area of 121 m2, located in the city of Izmir, Turkey in<br> terms of energetic, exergetic and sustainability aspects. The indoor<br> and exterior air temperatures are taken as 20°C and 1°C, respectively.<br> In the analysis and assessment, various metrics (indices or indicators)<br> such as exergetic efficiency, exergy flexibility ratio and susta...
Energy Engineering
The building sector contributes a large ratio of final energy consumption, and improving building energy efficiency is expected to play a significant role in mitigating its carbon dioxide emission. Herein, we collected the on-site measurement data to investigate the techno-economic performances of different heat pump types that exist in building space heating projects in Qingdao, China. An in-depth analysis revealed the temperature variations of measured low-grade heat sources over the whole heating supply period, and urban sewage water shows high stable heat energy quality compared with seawater and geothermal heat resources. Operational behaviors including cycling inlet and outlet temperature of the selected heat pumps were illustrated, and analysis evaluated detailed effects of operational parameters on energy efficiency performances. Then the relationship between COPs distributions of heat pumps and operational conditions was examined further, and the positive effect of the rising temperature of heat sources on energy efficiency improvement of heat pump is highlighted when the heating supply temperature is higher. Furthermore, we analyzed the economic and carbon emission performance of the heat pump system, and results show that electricity price plays a vital role in the lifespan energy cost saving potential, and the heat pump could serve as a promising approach in reducing CO 2 related to the building space heating. Finally, we recommended suggestions for improving the overall energy efficiency and cost competitiveness of decentralized heat pump systems for building space heating.
2020
The study focused on comparing the electrical energy and the volume of hot water consumed using the inefficient 18 kW, 1600 L electric boiler and an efficient and renewable air source heat pump (ASHP) unit with an input power of 6.0 kW, as retrofit to the electric boiler, for sanitary hot water production. A data acquisition system was built and deployed, to monitor the baseline while the electric boiler was in used and the performance assessment were the ASHP water heater was in operation. The results showed that the annual energy saving and the load factor reduction, due to the retrofitting of the electric boiler with the ASHP unit, was 52117.630 kWh and 0.092. One-way ANOVA test depicted that the p-value of the average month-day electrical energies consumed by the electric boiler and the ASHP water heater during the entire monitoring period was 1.09 x 10-22. A very small p-value confirmed a significant difference existed in at least one of the among four groups of the average mon...
Performances of heat pump systems as users of renewable energy for building heating/cooling
WSEAS Transactions on Heat and Mass Transfer
The heat pumps are alternative heating/cooling systems more energy efficiency and unless pollutant in comparison with classical systems (liquid or gas fuel boiler). A large number of heat pump systems have been used in residential and commercial buildings throughout the world due to the attractive advantages of high energy and environmental performances. This paper presents the economic, energy and environmental performance criteria which show the opportunity to implement a heat pump in a heating/cooling system. A computational model of annual energy consumption for an air-to-water heat pump based on the degreeday method and the bin method implemented in a computer program is developed. In addition, from a case study a comparative economical analysis of heating solutions for a building is performed and the energy and economic advantages of building heating solution with a water-to-water heat pump are reported. Finally, the renewable energy sources contribution from heat pump sales ...