연구홍보포털

논문 초록 (Abstract)

There is a need for hot water generation in a more efficient and environmentally friendly way for heating, ventilating, and air conditioning systems, and the heat pump is a great candidate f or that. In this paper, hot water temperatures generated by ground sour ce heat pump (GSHP) systems in Korea are analysed. It is also importan t to minimize the use and emission of refrigerants with high global warming potential (GWP) and ozone depletion potential (ODP) to reduce their impact onthe environment. In this regard, refrigerants that are used in GSHP units in Korea are investigated. The database is com posedof 86 GSHP units certified in Korea according to governmental regu lation. The GSHP units are divided into three types: water-to-water, wat er-to-air, and water-to-air multi heat pump units. The average hot wate r temperature generated by the certified GSHP units is 43.8 de grees C with the Korean standard test conditions (NR GT 101). Temper ature difference 3.8 degrees C between inlet and outlet of condens er is less than 5 degrees C as presented by the European Standard (NF E N standard). In order to replace the boiler and the convention al air conditioning unit with a highly efficient GSHP system, there is the need to increase the hot water generation temperature. With the refrigerants, 53.8% of the 78 water-to-water GSHP units use the hydro chlorofluorocarbon (HCFC) refrigerant, R22, while the other s use the hydrofluorocarbon (HFC) refrigerants, R410A, R407C, and R13 4a. All water-to-air and water-to-air multi heat pump units use R41 0A refrigerant. Because R22 is a HCFC and has high GWP and ODP , it is being replaced with HFC and natural refrigerants. However, HFC refrigerants also have high GWP. It is therefore recommend ed to encourage the responsible use or replacement of HFC refrig erants with natural and other alternative refrigerants in