OPTIMAL CAPACITY PLANNING OF HEAT PUMP/THERMAL STORAGE SYSTEM USED FOR DISTRICT HEATING AND COOLING

摘要

An optimal capacity planning method is proposed tor heat pump/thermal storage system used for district heating and cooling. Equipment capacities and utility maximum demands are determined so as to minimize the annual total cost in consideration of the system's operational strategy for the hourly varying energy demand in a year. The operational problem of the heat pump/thermal storage system is large scale one and a numerical method is proposed to solve the problem by using sensitivity analysis method. In a numerical study for district heating and cooling, seasonal utilization is investigated for thermal storage tanks from the economic viewpoint. From the result obtained, it is ascertained that the proposed method is a useful tool for the fundamental system's planning problem.