22 May 2008

PERFORMANCE IMPROVEMENT OF GROUND SOURCE HEAT PUMP SYSTEMS BY APPLYING MULTI-SPLIT HEAT PUMPS AND LOW FLOW CIRCULATION SYSTEM


In order to promote installation of the ground source heat pump (GSHP) system to
the medium-scale building in moderate climate region, the authors have developed a low
flow circulation (LF) GSHP multi-split system. This system applies low flow and large
temperature difference circulation system in primary side and multi-split system in secondary
side and can reduce energy consumption for circulating the thermal medium. The authors
have been conducted field experiment of the LF-GSHP multi-split system since June 2006.
Until present, the result of cooling operation demonstrated that the output and COP with the
highest output in this field test were almost equal to the one in laboratory experiment. This
was similar to the result of heating operation. Result of cooling operation with the output of
around 7 kW provided the largest COP of 6~8.