22 May 2008

PERFORMANCE ANALYSIS OF GROUND SOURCE HEAT PUMPS FOR DOMESTIC HOT WATER SUPPLY IN THE LOW ENERGY HOUSE AND ITS APPLICATION


Two types of the heat pump unit with R410a and CO2 as the refrigerant for
supplying domestic hot water in the low energy house were analyzed. First, performance
tests of the GSHP units for DHW were carried out and the COP and heating output according
to the inlet and outlet temperature, and flow rate were investigated. Next, it was shown that
the GSHP systems for DHW with R410a and CO2 can reduce 30~ 50 % of CO2 emission
compared to the conventional oil boiler system by simulation with a design tool for the GSHP
system. In addition, the authors introduced the ground source CO2 heat pump system
application for the residential cooling and demonstrated that the total COP is 4.21 and this
system can provide SC and DHW with high efficiency by simulation.