cooling energy conservation

Recently, natural ventilation, which is a traditional cooling method in Japan, has become considered as the key method for cooling energy conservation. The results of experiments are presented to measure the indoor thermal environment and cooling power consumption in an experimental dwelling by simulating occupants' life-style including thermal control with natural ventilation and air conditioning. Based on the experimental results the cooling power consumption from July to September has been estimated.

In summer, most areas in Japan are hot and humid. Hokkaido Island, which is the most northern part of Japan, is the only exception. However, air conditioning systems have become the norm in all big buildings in Japan, even in Hokkaido, due to increased internal generation of heat from lights and equipment such as computers and printers. However, the outside air temperature often drops below 26C during summer everywhere in Japan even when cooling and air conditioning is turned on.