TY - JOUR
T1 - Performance evaluation of a water-to-water heat pump with a floor panel heating system
AU - Min, Man Ki
AU - Kim, Yongchan
AU - Lee, Sang Hyeok
AU - Ko, Cheol Soo
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1999/8
Y1 - 1999/8
N2 - The performance of heat pump is severely degraded as the temperature of the heat source is decreased. For air source heat pumps, this results in a serious mismatch of heat pump output and space heating demand. Although the outdoor temperature is below 0°C, the use of a water-to-water heat pump with a floor panel heating system can operate for extended periods of time without frost-defrost cycling and therefore at a high seasonal efficiency. This paper focuses on the performance of a water-to-water heat pump that uses well water as a heat source and a floor panel heating system as a sink. Field tests of a water-to-water heat pump combined with the floor panel heating system in a heavily insulated miniature test house were conducted to obtain its cyclic performance as well as the seasonal performance. The test house, which had a floor area of 27.5 m2, consisted of three rooms that were equipped with panel heating coils under floor surface. The heating capacity of the water-to-water heat pump was 3.95 kW with double tube heat exchangers. The averaged COP of the water-to-water heat pump system was measured for every cycle throughout the intermediate season and analyzed as a function of outdoor temperature. The cyclic performance such as part load factor, cyclic operation performance, and degradation coefficient degraded as the outdoor temperature increased, because of relatively increasing off-cycle duration in the cycle as well as lengthening of the cycle duration.
AB - The performance of heat pump is severely degraded as the temperature of the heat source is decreased. For air source heat pumps, this results in a serious mismatch of heat pump output and space heating demand. Although the outdoor temperature is below 0°C, the use of a water-to-water heat pump with a floor panel heating system can operate for extended periods of time without frost-defrost cycling and therefore at a high seasonal efficiency. This paper focuses on the performance of a water-to-water heat pump that uses well water as a heat source and a floor panel heating system as a sink. Field tests of a water-to-water heat pump combined with the floor panel heating system in a heavily insulated miniature test house were conducted to obtain its cyclic performance as well as the seasonal performance. The test house, which had a floor area of 27.5 m2, consisted of three rooms that were equipped with panel heating coils under floor surface. The heating capacity of the water-to-water heat pump was 3.95 kW with double tube heat exchangers. The averaged COP of the water-to-water heat pump system was measured for every cycle throughout the intermediate season and analyzed as a function of outdoor temperature. The cyclic performance such as part load factor, cyclic operation performance, and degradation coefficient degraded as the outdoor temperature increased, because of relatively increasing off-cycle duration in the cycle as well as lengthening of the cycle duration.
KW - Cyclic performance
KW - Floor panel heating system
KW - Water-to-water heat pump
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U2 - 10.1007/BF03184558
DO - 10.1007/BF03184558
M3 - Article
AN - SCOPUS:0033177241
VL - 13
SP - 642
EP - 649
JO - KSME International Journal
JF - KSME International Journal
SN - 1226-4865
IS - 8
ER -