Studies on Prediction Methods of Water Temperature in the Distribution and Water Supply Pipes : Part 1-The results of Investigation on Water Temperature at purification facilities in each region and Prediction Methods of Water Temperature in Distribution Pipes

Abstract

The energy required in the hot water supply system is determined by how many degrees the water temperature is raised to meet a given hot water supply temperature. Therefore, the hot water supply temperature constitutes an important factor in considering energy conservation in the hot water supply system. In this report we measured water temperatures at purification facilities in 9 major cities in Japan, conducted correlation analysis in relation to air temperature, and established regression equations to predict water temperature from air temperature. A prediction method of water temperature is indicated based on the calculation models for two separate water passages: one from the source of rivers to purification facilities, the other from purification facilities to distribution pipes.