Abstract
The authors compared various methods of outdoor design conditions for heating and cooling loads by using Tokyo hourly weather data for 15 seasons from 1972 to 1987, observed by the Tokyo district meteorological observatory. The best method is found on heat load taking account of building and operation schedule and the better method is based on outdoor temperature. TAC method is recognized too safe outdoor condition as compared with other methods. The authors propose a simplified seasonal heating and cooling loads calculation method. At first, accumulated distribution curve of daily total loads prepared by accurate computer simulation loads is divided to several sections and each section has typical outdoor condition. Secondary, by using each outdoor condition, periodic heat load calculation is made and weighting factors are multiplied to each heat load. Then seasonal heating and cooling loads are accomplished. Utilizing this method, heating and cooling capacity load and seasonal load can be calculated easily and this method is proved to be accurate comparatively.
