Abstract
This chapter proposes an optimal operation scheme of HVAC systems for existing buildings and investigates the test results of applying the scheme in a real office building. In total optimal operation, optimal set points, which are water flow rate of secondary pump, airflow rate of supply fan in AHU, and outlet water temperature from heat pump are determined by solving an optimal problem. Total optimal operation was tested in 27/10/2001, when cooling load was small. The percentage of reducing energy consumption could be expected to be lower when it is in a peak load season because the optimal operation cuts down the excessive energy consumed by normal operation. When it is in peak load season, the excessive energy is not as much as in low load season. So the expected energy saving effect of optimal operation is not as much as that in low load season. The chapter finally compares optimal operation in a high load season with normal operation in the season by using simulation models.
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