The Experts below are selected from a list of 8745 Experts worldwide ranked by ideXlab platform
Ahmet Caglar - One of the best experts on this subject based on the ideXlab platform.
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performance analysis of a solar assisted heat pump with an evacuated tubular collector for domestic heating
Energy and Buildings, 2012Co-Authors: Ahmet Caglar, Cemil YamaliAbstract:Abstract Performance of a solar-assisted heat pump with an evacuated tubular collector has been analyzed both theoretically and experimentally. A domestic heating system has been designed, constructed and tested. The evacuated tubular solar collector has been used to achieve higher collector efficiencies. The effects of evaporation Temperature on the heating capacity and performance of the system have been investigated. Evaporation Temperature varies between 5.2 and 20.7 °C while Storage Tank Temperature varies between 9 and 35 °C. The maximum value of the coefficient of performance of the solar assisted heat pump is obtained as 6.38 experimentally. The calculated and experimental results are seen to be in a good agreement. A cost analysis of the proposed system is made comparing with a non-solar heat pump system.
Mazhar Unsal - One of the best experts on this subject based on the ideXlab platform.
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energy analysis and modeling of a solar assisted house heating system with a heat pump and an underground energy Storage Tank
Solar Energy, 2012Co-Authors: Recep Yumrutas, Mazhar UnsalAbstract:Abstract An analytical model is presented and analyzed to predict the long term performance of a solar assisted house heating system with a heat pump and an underground spherical thermal energy Storage Tank. The system under investigation consists of a house, a heat pump, solar collectors and a Storage Tank. The present analytical model is based on a proper coupling of the individual energy models for the house, the heat pump, useful solar energy gain, and the transient heat transfer problem for the thermal energy Storage Tank. The transient heat transfer problem outside the energy Storage Tank is solved using a similarity transformation and Duhamel’s superposition principle. A computer code based on the present model is used to compute the performance parameters for the system under investigation. Results from the present study indicate that an operational time span of 5–7 years will be necessary before the system under investigation can attain an annually periodic operating condition. Results also indicate a decrease in the annually minimum value of the Storage Tank Temperature with a decrease in the energy Storage Tank size and/or solar collector area.
Christos Papamarcou - One of the best experts on this subject based on the ideXlab platform.
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modelling of a thermosyphon solar water heating system and simple model validation
Renewable Energy, 2000Co-Authors: Soteris A Kalogirou, Christos PapamarcouAbstract:A thermosyphon solar water heater consisting of two flat plate collectors of total aperture area of 2.7 m2 and 150 l Storage Tank is modelled using TRNSYS. Simple experiments were conducted in order to validate the model. During the experiments weather conditions were measured every 10 min and integrated over an hour. The Temperature of the water in the Storage Tank was also measured at the beginning and at the end of the day. The Storage Tank Temperature rise was used to validate the model by using the actual weather data as input to the program. Validation tests were performed for 25 days spread over 6 months and the mean deviation between the predicted and the actual values of water Temperature rise is 4.7% which is very satisfactory. Subsequently, long term system performance is estimated by using TRNSYS model run with the weather values of TMY file for Nicosia, Cyprus. The annual solar fraction obtained was 79% and the system could cover all the hot water needs of a house of four people during the three summer months. The maximum auxiliary energy was needed during the months of December and January (about 280 MJ/month). In addition, an economic analysis of the system was carried out. The pay-back time of the system was found to be 8 years and the present worth of life cycle savings was found equal to C£ 161.
Ayse Ecevit - One of the best experts on this subject based on the ideXlab platform.
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effect of hot water load Temperature on the performance of a thermosyphon solar water heater with auxiliary electric heater
Energy Conversion and Management, 1995Co-Authors: Adnan Shariah, Ayse EcevitAbstract:A thermosyphon solar water heating system with an in-Tank auxiliary electric heater has been simulated for different hot water load Temperatures using the TRNSYS simulation program. The results of the simulation show that the annual efficiency and solar fraction are functions of the hot water load Temperatures. The effect of load Temperature on the solar fraction is found to be very large when the daily load volume (the volume of hot water delivered to load) to collector area ratio is large. The influence of Storage Tank volume to collector area ratio on the efficiency of the collector is observed only when this ratio is less than or equal to 40 1 m2 for all collector areas and load Temperatures studied. Generally, the annual average Storage Tank Temperature depends on the load Temperature and had lower values for high load Temperatures. The response of the system performance to the area of the collector is found to be very large when the system operates with a solar fraction below 70%.
Cemil Yamali - One of the best experts on this subject based on the ideXlab platform.
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performance analysis of a solar assisted heat pump with an evacuated tubular collector for domestic heating
Energy and Buildings, 2012Co-Authors: Ahmet Caglar, Cemil YamaliAbstract:Abstract Performance of a solar-assisted heat pump with an evacuated tubular collector has been analyzed both theoretically and experimentally. A domestic heating system has been designed, constructed and tested. The evacuated tubular solar collector has been used to achieve higher collector efficiencies. The effects of evaporation Temperature on the heating capacity and performance of the system have been investigated. Evaporation Temperature varies between 5.2 and 20.7 °C while Storage Tank Temperature varies between 9 and 35 °C. The maximum value of the coefficient of performance of the solar assisted heat pump is obtained as 6.38 experimentally. The calculated and experimental results are seen to be in a good agreement. A cost analysis of the proposed system is made comparing with a non-solar heat pump system.