1967年夏天,位于华盛顿的国际货币基金组织(下称IMF)大楼的空调系统改为由数字计算机直接控制。实践证明,使用计算机是实现“全自动”大楼的关键。 IMF大楼的经验表明,用计算机实现空调系统自动化的收益短期(25个月)就偿清了投资(加装计算机约用了48000美元,全部新建则为71600美元)。该大楼为十三层,空调面积475,000英尺~2(约53000米~2)。五年的运行表明,年毛收益45156美元。 In the summer of 1967, the air-conditioning system of the International Monetary Fund (IMF) building in Washington DC was replaced by a digital computer. Practice has proved that the use of computers is the key to realizing a “fully automatic” building. The experience of the IMF building shows that the benefits of using computers to automate air-conditioning systems have paid off in the short term (25 months) (approx. US$ 48,000 for additional computers and US$ 7,1600 for all new builds). The 13-storey building has an air-conditioned area of ​​475,000 feet-2 (approximately 53,000 meters-2). The five-year operation shows that the annual gross return is 45,156 US dollars.