Abstract
Absorption chillers at cogeneration plants generate chilled water using steam supplied by heat recovery steam generators. The chillers are mainly of double effect type. The COP of double effect varies from 0.7 to 1.2 depending on operation and maintenance practices of the chillers. Heat input to the chillers during operations could have impact on the COP of the chillers. This study is on relative COP changes with increasing the heat input temperatures for a steam absorption chiller at a gas fueled cogeneration plant. Reversible COP analysis and zero order model were used for evaluating COP of the chiller for 118 days operation period. Results indicate increasing COP trends for both the reversible COP and zero model COP. Although the zero model COP are within the range of double effect absorption chiller, it is not so for the actual COP. The actual COP is below the range of normal double effect COP. It is recommended that economic replacement analysis to be undertaken to assess the feasibility either to repair or replace the existing absorption chiller.
Highlights
MethodologyThe first two approaches are adopted from [2]
2 MethodologyThree approaches were used to evaluate COP for this study
The high values of reversible COP in comparison to lower values of zero order COP is in agreement as reported by [2]
Summary
The first two approaches are adopted from [2] The choice of these two models is based on their usefulness to evaluate the influence of COP to increasing heat input temperatures. Additional to COP evaluation, effectiveness of the heat exchanger was evaluated. Eq (1) was used for calculating the reversible COP of SAC [1]. The effectiveness of heat exchanger was calculated using equation (8), [2]; ߝுா
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