本文讨论了日本吸收式制冷机最早是在大约20年前制造的。然后，研制了一台以蒸汽为热源生产冷冻水的蒸汽吸收式制冷机。到1965年，东京都会区几乎所有建筑的供暖锅炉都使用重油，锅炉排放的硫氧化物造成的空气污染成为一个严重的社会问题。为此，开发了一种燃气直燃吸收式冷水机组，利用城市燃气，通过直接燃烧生产冷水和热水。同时，为了达到节能的目的，制冷循环从单效式发展到了双效式。引文:德克萨斯州休斯顿ASHRAE学报第88卷第1部分

This paper discusses that in Japan, absorption refrigerating machines were first manufactured about 20 years ago. Then, a steam absorption refrigerating machine producing chilled water by using steam as heat source was manufactured. By 1965, heavy oil was used in the heating boilers of almost all the buildings in the Tokyo metropolitan district, and air pollution caused by sulfur oxides, exhausted from the boilers, became a serious social problem. For that reason, a gas direct-fired absorption water heater chiller, producing chilled and hot water by direct firing, using city gas, was developed. At the same time the refrigeration cycle was advanced from a single-effect to a double-effect type for energy-saving purposes.