鉴于房屋的采暖和空调所消耗的能量往往占一个国家耗能量的四分之一,因此利用太阳能来实现房屋的采暖和空调已受到各国的重视。例如,西德1977—1980年太阳能利用的科研经费为一亿四千万马克,而其中五千万马克用于太阳能采暖和空调的研究;美国的太阳能利用发展规划中,把太阳能采暖的空调放在最 Given that the energy consumed by heating and air conditioning in a home often accounts for one-fourth of the energy consumed in a country, the use of solar energy for heating and air conditioning in homes has received the attention of countries. For example, the scientific research funding for solar energy utilization in West Germany from 1977 to 1980 was 140 million DM, of which 50 million DM was used for solar energy heating and air conditioning research; in the US solar energy development development plan, solar heating air conditioning was put in In the most