Multi-stage solid absorption heat transformers for recovery of industrial waste heat
This project investigates the feasibility of using solid adsorption heat pumps and heat transformers for upgrading industrial waste heat to temperatures at which it can be used for process purposes. Systems using ammonia as the working substance and metal halides as absorbents are considered. The main dimensions of a continuously operating heat pump for energy recovery from a drying process have been worked out. The design is based on a large number of elemental absorbers, comprising a rotating drum in the manner of rotating heat regenerators. A mathematical model consisting of the differential and algebraic equations for the heat transfer and reaction processes has been developed and used to simulate a few heat pump cycles. The equations are solved simultaneously by a programme complex called SPADE. The results are presented in terms of the coefficient of performance, supplemented by temperature curves showing the cyclic variation of air, gas, absorption and equilibrium temperatures. In comparison with possible outcomes if all processes proceeded reversibly, the results are disappointing. Large irreversibility occurs particularly at the low temperature end of the cycles, where the impossibility of arranging for regenerative heat exchange is felt most. In comparison with an ordinary rotary regenerator solid absorption heat pumps (and heat absorbers) are too bulky.
Bibliographic Reference: EUR 12289 EN (1989)
Record Number: 198910967 / Last updated on: 1994-12-01
Original language: en
Available languages: en