The thermal performances of two types of Building Structure Thermal Storage HVAC system, the Ceiling Plenum type (SC) and Underfloor Plenum type (SF), were analyzed through real scale experiments under maximum cooling loads. Subsequently, they were compared with the performances of the ordinary HVAC systems without heat storage, with the ceiling air supply system (OC) and underfloor air supply system (OF) operated with and without pre-cooling operating hours. The results obtained were as follows:
1) The SF system, that provides heat storage during the nighttime, in some cases supplies the stored heat inconveniently to building structures in the daytime cooling mode. Therefore the total daily loads for the SF system is greater for than the SC system. However, it reduces the cooling loads in the daytime.
2) The pre-cooling operating mode in both the OC system and OF system is effective for the reduction of cooling loads in the daytime, but slightly inferior to the operation of the SC system and SF system.
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