The absorption power generator is an apparatus for generating power from low temperature heat. It is a recent invention, protected by U.S. Pat #4,662,820. It has possible application in the fields of geothermal power generation, waste heat utilization, and cogeneration. The basic components are an evaporator with vertical heating tubes, a prime mover, an absorber, a solution pump, a solution heater, a condenser, a condensate pump, a condensate cooler, and a heat exchanger. A vaporous fluid, like ammonia, and an absorbent liquid, like water, are used in the process. The flow of high pressure vapor, generated in the evaporator, is divided into two parts. One part is expanded in the prime mover. The low pressure vapor, coming off the prime mover, is then absorbed in a spray of absorbent liquid in the absorber. The other part of the high pressure vapor flow is condensed in a high pressure condenser where the temperature is held above that of the available cooling medium