The Operational phase of a retro-commissioning process is generally finishing phase of a retrofit project for a HVAC system. In a newly installed HVAC system, if the heat source system along with the secondary systems, such as air-handling unit, pumps, and fans, are adjusted adequately in accordance with the change of heat load every season, more energy saving would be achieved. On the other hand, since testing, adjusting, and balancing (TAB) are supposed to be carried out only the acceptance step of the construction phase as a delivery test of almost all the retrofit projects, some projects fail to meet the owners requirements which is set at the program phase for achieving more energy saving or amenities for the indoor environment, because owners would be carried out only at the end of the construction phase owing to the restrictions of the existing contract agreement. Considering this information, a functional performance test, which is a new delivery test for retrofit projects and whose procedure is prescribed in the guidelines published by HPTCJ (Heat Pump Technology Center of Japan), was performed in the operational phase of this project. By performing a series of performance tests and operational optimization for a HVAC system every season, we believe that we could provide the HVAC system with a satisfactory environmental performance to the case to in which the conventional TAB method would be applied. In this paper, the results of a functional performance test, which was performed on existing HVAC system of an office building between in July 2008 to March 2009, was shown. Moreover, the problems to be solved of the proposed method are shown.
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