Measures to minimize entropy production in compression-resorption heat pumps

Conference paper (2018)

Authors

V. Gudjonsdottir Engineering Thermodynamics - Mechanical, Maritime and Materials Engineering

C.A. Infante Ferreira Engineering Thermodynamics - Mechanical, Maritime and Materials Engineering

Anton Goethals Compressor Technique

Anton A. Kiss University of Twente

Research Group

Engineering Thermodynamics (Mechanical, Maritime and Materials Engineering) (TU Delft)

Ammonia-water CRHP Entropy production Twin screw compressor

More Info

expand_more

To reference this document use:

http://resolver.tudelft.nl/uuid:cc02fddc-3ec7-4386-b155-e31f095f27fc

Published Date

2018

Language

English

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Faculty

Mechanical, Maritime and Materials Engineering

Department

Process and Energy

Research Group

Engineering Thermodynamics

Abstract

Compression-resorption heat pumps (CRHP) enhanced by wet compression are considered a very promising option to upgrade low grade waste heat from the industry. This is especially true for applications where the heat source and/or sink have a large temperature glide. But commercial solutions using wet compression are not yet available on the market. Compared to the classically used vapor compression heat pumps (VCHP), CRHP can provide much better performance but only if the efficiency of the compressor exceeds 0.7. In this respect, a twin screw compressor has been identified as a potential solution to reach this efficiency goal. This study makes use of the entropy production minimization to identify where the major irreversibilites are located in a CRHP system operated with an ammonia-water mixture. A detailed model of the wet compressor and the resorber are coupled with simplified models of other components of the HP cycle to analyze where potential improvements can be made. The results show that significant benefits can be obtained using CRHP.