A practical study on application of the commissioning to DHC on operation and maintenance stage : Effort and result which carried on three years from completion

Abstract

Based on the longstanding measurement result of DHC system, which had a plan of commissioning from pre-design, the following results were shown by commissioning in operation and maintenance stage. 1) As the result of a longstanding measurement and the commissioning, it was shown that DHC system had been operate with high primary energy conversion COP (about 1.2) without influence of aged deterioration, 2) As the result of the commissioning, temperature difference become about 10 degrees C and it led to realization of large-temperature-difference water supply. 3) With realization of large-temperature-difference water supply, the large thermal storage tanks were operated with high efficiency as the original plan. 4) As the result of high efficiency operation of the large thermal storage tanks, much of energy consumption shifted to midnight and chillers were operated with high load factor.