In this paper, in order to evaluate natural ventilation properties and energy saving effects of a hybrid air-conditioning system in an existing office building with flow control inlets and outlets in spring, measurements and thermal and air-flow network analyses were carried out. The following results were obtained: 1) The behavior of the hybrid air-conditioning system was shown in detail based on analyses of measured values for each floor and area within a month or a day. 2) The flow rate at all air supplies by natural ventilation was reduced to less than 1,400 m
3/h by flow control function and the average of each floor's natural ventilation rate was 13,984 m
3/h (twice the amount of required ventilation rate). 3) The mean calculation error for measurement values of ventilation rate was about 9.8%, and so the proposed calculation model had sufficient prediction accuracy. 4) In this analysis, cooling energy consumption was reduced about 22.3 % by the natural ventilation during this measurement. 5) Relations of natural ventilation rate to the flow control system, buoyancy caused by heat loads and energy consumption of cooling were clarified by case studies using the calculation model.
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