2단 가열식 지열시스템의 경제성 분석

This paper provides an economic analysis of a new geothermal heat pump system that reuses condenser waste heat from a Ground Source Heat Pump (GSHPch) to provide energy for a hot water Ground Source heat pump (GSHPhw). After conducting feasibility tests using GLD and TRNSYS simulations, the proposed system was effectively installed and thoroughly tested. We observe that 1) the Coefficient of Performance (COP) of the GSHPhw and the GSHPch during cooling mode improves by up to 62% and 7%, respectively; 2) the number of bore holes can be reduced by two; and 3) the hot water supply temperature of the GSHPhw increases by up to 60°C. We further conclude that 1) the reduction of two bore holes can save approximately ten million Won from the initial cost investment; and 2) the increased COP of the GSHPhw can save approximately one million Won in annual electricity costs.