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Thermodynamic analysis of ammonia-water power/chilling cogeneration cycle with low-grade waste heat

Lookup NU author(s): Juyne Hua, Dr Yaodong Wang, Professor Tony Roskilly

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Abstract

An ammonia-water absorption cycle for power and chilling output cogeneration from mid/low-grade waste heat was analyzed and optimized, which is a modified Kalina cycle adding an evaporator and a subcooler to realize the chilling effect. The cycle achieves higher efficiency by generating chilling output from proper internal recuperation process without consumption of additional heat resource and by realizing heat transfer with suitable ammonia concentrations for variable phase change processes to match both heat source and cooling water. Analysis of the impact of key parameters for the system on the thermal and exergy efficiencies was carried out. The results show that there are matching basic and work concentration pairs for a higher efficiency. The smaller circulation multiple and greater chilling fraction are favorable to the efficiencies but restricted respectively by heat transfer constraint of recuperator and the demand. The calculation example with the turbine inlet parameters set at 195 degrees C/2.736 MPa and the cooling water inlet temperature set at 25 degrees C with chilling fraction of 0.5 shows that the thermal efficiency and exergy efficiency reach up to 16.4% and 48.3%, about 24.24% and 8.16% higher than those of an ammonia-water power cycle under identical condition. (C) 2013 Elsevier Ltd. All rights reserved.


Publication metadata

Author(s): Hua JY, Chen YP, Wang YD, Roskilly AP

Publication type: Article

Publication status: Published

Journal: Applied Thermal Engineering

Year: 2014

Volume: 64

Issue: 1-2

Pages: 483-490

Print publication date: 01/03/2014

ISSN (print): 1359-4311

ISSN (electronic): 1873-5606

Publisher: Pergamon

URL: http://dx.doi.org/10.1016/j.applthermaleng.2013.12.043

DOI: 10.1016/j.applthermaleng.2013.12.043


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