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Performance evaluation of a vertical ground‐source heat pump system in Izmir, Turkey
Author(s) -
Hepbasli A.
Publication year - 2002
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.839
Subject(s) - heat pump , coefficient of performance , environmental science , nuclear engineering , thermal diffusivity , heat pipe , cooling load , air source heat pumps , engineering , mechanical engineering , heat transfer , thermodynamics , air conditioning , physics , heat exchanger
Abstract This study summarizes the cooling performance of a ground‐source heat pump system which was installed in a 65‐m 2 room in the Solar Energy Institute, Ege University, Izmir (568 degree‐days cooling, base: 22°C; 1226 degree‐days heating, base: 18°C) Turkey. The institute, built in 1986, has a liveable floor area of 3000 m 2 , and uses passive solar techniques. The heating and cooling loads of the room were, respectively, 3.8 and 4.2 kW at design conditions. The system was commissioned in May 2000 and the performance tests have been carried out since then. Based upon the measurements, the heat rejection rate to the soil with an average thermal diffusivity of 0.00375 m 2 h −1 in the cooling mode was found to be in average 51 W m −1 of bore depth, while the maximum entering water temperature to the unit was recorded as 35.9°C. The cooling coefficient of performance of the heat pump and the whole system was relatively low when compared to other heat pumps operating under conditions at or near design values. The primary reasons for this were discussed in detail and the potential for performance improvements was also suggested. Copyright © 2002 John Wiley & Sons, Ltd.