Selection of outdoor design wet-bulb temperature for summer air conditioning

Presents the climatic zoning in Chinese standard and ASHRAE Standard 90.1-2010. Analyses the difference of outdoor design wet-bulb temperature for summer air conditioning for some cities between Chinese and American standards. Selecting some typical cities in China, adopts the outdoor design parameters for summer stipulated in Chinese and American standards respectively to calculate the cooling load from outdoor design air, and finds that the results in the cities with low and middle wet-bulb temperature are very different. Compared to the outdoor design wet-bulb temperature for summer air conditioning stipulated in American standard, the design parameter for the same city in our standard is generally larger, especially in dry-hot climate area, which increasing the initial cost of air conditioning system designed by our specifications.