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

As a part of our research on energy conservation and thermal comfort of detached houses havingcentralized HVAC systems, study with numerical simulation techniques was started. The model is thehouse that has mechanical supply and exhaust ventilation systems with a centralized air duct equippedwith a sensible heat exchanger and has large return air (4 times an hour). The parameters in thesimulation are the set point temperature and outdoor air flow rate. The authors have already showedenergy calculation results for Tokyo, and it has been discussed that the utilization of fresh outdoor air asa 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. Thispaper discusses the generality of this finding by showing the results of the similar energy calculationsusing several weather data differing from that of Tokyo. As a result, it would be rash to conclude thatthe effect of space cooling with outdoor air is small without considering of building conditions, forexample, in case of the building with high heat storage performance, large solar heat gain and largeinternal heat load during intermediate season.