Feasibility Study of Ammonia-Water Vapor Absorption Heat Transformer

[+] Author and Article Information
A. Ertas, J. J. Luthan

Mechanical Engineering Department, Texas Tech University, Lubbock, Tex. 79409

P. Gandhidasan

Mechanical Engineering Department, University of the West Indies, St. Augustine, Trinidad

J. Energy Resour. Technol 109(2), 96-100 (Jun 01, 1987) (5 pages) doi:10.1115/1.3231332 History: Received September 01, 1986; Revised April 27, 1987; Online October 22, 2009


Many industrial sectors reject heat to the atmosphere in the form of hot water with a temperature between 40° and 70°C. This low grade heat can be upgraded by using a vapor absorption heat transformer (AHT). The present study considers a single stage AHT with binary mixture of NH3 –H2 O as the working fluid. The performance characteristics of the system have been evaluated by solving the governing mass and energy balance equations using a digital computer. It is found that the permissible range of concentration across the absorber is 0.04<ΔX <0.075 for the following operating conditions:

Tuseful heat≤120°C,
43°≤Twaste heat≤88°C

Copyright © 1987 by ASME
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