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The purpose of this study is to suggest the cost analysis breakdown system of discount rate for decision maker in life cycle cost analysis. During the period of LCC analysis of primary cooling system, the project phases is divided into planning/design, equipment construction, maintenance/management and demolition/sell phases, and established cost items of each phases. The main results are as follows; (1) The result of LCC15(discount rate 6%～16%) of primary cooling system indicates that the absorption chiller-heater system for urban gas is the most economical system. (2) In each cost phases about LCC15(discount rate 6%-16%), the result indicates that the cost of planning/design, initial investment, support and taxes(1st) was increased and that of energy, drainage, maintenance, running labor, taxes(every year), fire insurance and demolition labor was decreased.
(3) In each process phases about LCC15(discount rate 6%-16%), the result indicates that the rate of planning/design, equipment
construction was increased and that of maintenance, demolition was decreased