30 May 2005

DEVELOPMENT OF A DESIGN AND PERFORMANCE PREDICTION TOOL FOR GROUND SOURCE HEAT PUMP SYSTEM


This paper introduces a novel designing and performance prediction tool for the ground source
heat pump (GSHP) system which authors have developed. This tool has some advantages and features,
such as containing a user-friendly interface for input data and showing calculation result graphically to
make operators understand. First, outlines of this tool were described. Next, a performance prediction
and an installation effect feasibility of the GSHP system using steel foundation piles as ground heat
exchangers in Tokyo was performed with this tool as an example. Results of the calculations show that
the LCCO2 of the GSHP system is 1338 kg-CO2/year and it is less than half compared to conventional
systems. Also, the GSHP system can reduce LCC by 50~90 thousand Japanese-yen/year. The cost
payback time for increasing investment of the GSHP system is less than ten years against other
conventional systems.