A FEASIBILITY STUDY ON SPACE COOLING WITH OUTDOOR AIR USING A DYNAMIC ENERGY SIMULATION PROGRAM PART 1: PARAMETRIC STUDY ON FEASIBILITY OF SPACE COOLING WITH OUTDOOR AIR ON SEVERAL WEATHER CONDITIONS

ABSTRACT As a part of our research on energy conservation and thermal comfort of detached houses having centralized HVAC systems, study with numerical simulation techniques was started. The model is the house that has mechanical supply and exhaust ventilation systems with a centralized air duct equipped with a sensible heat exchanger and has large return air (4 times an hour). The parameters in the simulation are the set point temperature and outdoor air flow rate. The authors have already showed energy calculation results for Tokyo, and it has been discussed that the utilization of fresh outdoor air as a cooling source during the intermediate season save a few percent of the annual heating/cooling loads (Matsumoto et al. 2003). However, whether this finding is sure except for Tokyo is not clear. This paper discusses the generality of this finding by showing the results of the similar energy calculations using several weather data differing from that of Tokyo. As a result, it would be rash to conclude that the effect of space cooling with outdoor air is small without considering of building conditions, for example, in case of the building with high heat storage performance, large solar heat gain and large internal heat load during intermediate season.