Abstract
Although design air-conditioning loads have been calculated on the basis of the excess probability of climatic design conditions, the room air temperature deviation from the set point caused by the lack of equipment capacity has been neglected. This paper provides a calculation method for the equipment capacity determined by the room air temperature deviation. The thermal load calculation is repeated until the room air temperature deviation becomes less than the required permission level. The number of repetitions of the equipment capacity reduction is minimized by using the first term of the weighting factors. The calculated equipment capacity results determined by the room air temperature deviation are compared with the conventional calculation results for various loads. As a result of the comparison, the actual weather years are more suitable for this calculation than the reference year. For this reason, the actual years are more severe than the reference year. As a result, the reference year cannot reproduce the actual years.
