Determination of record period for outdoor design dry-bulb temperature against climate change background

Describes the determining method, in which based on the two basic principles of determining the record period, the standard deviation method and optimal climate model of uniform status are used to calculate the minimal record period and the optimal average respectively. Compares the two values and determines the record period for the outdoor design dry-bulb temperatures. Taking Tianjin as an example, the record period for dry-bulb temperature is 15 years at cumulative frequency of 0.4%, 1.0% and 2.0% based on ASHRAE method, while 10 years at 99.0% and 99.6%. Based on Chinese method, the record period for the outdoor design temperature for heating, outdoor design temperature for winter air conditioning and outdoor design dry-bulb temperature for summer air conditioning should be 13, 10 and 15 years respectively.