Experimental study of a closed loop vertical ground source heat pump system
Küçük Resim Yok
Tarih
2003
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Pergamon-Elsevier Science Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Ground source heat pumps (GSHPs), also known as geothermal heat pumps, are a promising new technology that has been used for the last three years in the Turkish market. The main objective of the present study, which was performed for the first time in Turkey at the university level, is to investigate the performance characteristics of a GSHP system with a 50 in vertical 1(1)/(4) in. nominal diameter U-bend ground heat exchanger. This system was installed in a 65 m(2) room in the Solar Energy Institute, Ege University, Izmir (568 degree days cooling, base: 22 degreesC, 1226 degree days heating, base: 18 degreesC), Turkey. The Institute, built in 1986, has a livable floor area of 3000 m(2) and uses passive solar techniques. The heating and cooling loads of the room were 3.8 and 4.2 kW at design conditions, respectively. The system was commissioned in May 2000 and performance tests have been conducted since then. Based upon the measurements made in the heating mode, the heat extraction rate from the soil, with an average thermal diffusivity of 0.00375 m(2)/h, was found to be, on average, 11 W/m of bore depth, while the required borehole length in meter per kW of heating capacity was obtained as 14.7. The entering water temperature to the unit ranged from 5.5 to 13.2 degreesC, with an average value of 8 degreesC. The heating coefficient of performance of the heat pump and the whole system was extremely 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. (C) 2002 Elsevier Science Ltd. All rights reserved.
Açıklama
Anahtar Kelimeler
coefficient of performance, energy efficiency, geothermal heat pumps, ground source heat pumps, heat pumps, heating and cooling systems, Izmir (Turkey)
Kaynak
Energy Conversion and Management
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
44
Sayı
4
