仅在美国，商业热水的生产就消耗了约1.06四分之一的能源。燃气加热器的一次能源效率约为90%，而电加热器的一次能源效率约为32%。在这两种情况下，高质量、高（火用）能量被一对一地直接转化为极低质量的能量，产生极低的第二定律效率。开发了一种燃气热水吸收式热泵，该热泵结合了发电机-吸收器热交换（GAX），以在60°C（140°F）以上的温度下输送热水。 燃气COP为1.54时，三分之一用于商业热水的燃气可以节约。热泵还提供“免费”冷却，蒸发器温度低至-10°C。预计对典型商业客户的回报约为两年。本文总结了原型热泵的设计和测试，验证了组件性能、热泵容量、温升、供水温度和COP。单位:双引文:研讨会论文，大西洋城，2002年

About 1.06 quads of energy are consumed in the U.S. alone in the production of commercial hot water. The primary energy efficiency is about 90% for gas heaters and 32% for electric. In both cases, high-quality, highly exergetic energy is directly converted one-for-one into very low quality energy, yielding very low second law efficiencies.A gas-fired hot water absorption heat pump has been developed, incorporating generator-absorber heat exchange (GAX) to deliver hot water at temperatures above 60°C (140°F). With a gas COP of 1.54, one-third of the gas used for commercial water heating can be conserved. The heat pump also provides "free" cooling with evaporator temperatures as low as -10°C. The projected payback to the typical commercial customer is about two years.This paper summarizes the prototype heat pump design and testing, verifying component performance, heat pump capacity, temperature lift, water delivery temperature, and COP.Units: Dual