Feasibility Study of Ammonia-Water Vapor Absorption Heat Transformer

Abstract

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°Cand 10°≤Tsink≤27°C.