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Solar Powered Cascading Cogeneration Cycle with ORC and Adsorption Technology for Electricity and Refrigeration

Lookup NU author(s): Professor Tony Roskilly

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Abstract

As a renewable source, solar energy has received more and more attention in recent years. Solar energy can readily provide heat efficiently within the temperature range of 70-100 degrees C. For the utilization of this energy source, a cascading cycle was designed and was discussed. An organic Rankine cycle (ORC) and an adsorption refrigeration cycle were combined to provide the first- and second-stage energy conversion cycle, respectively. In the analysis, R600 was used as the working fluid for the ORC and a silica gel-water working pair was analyzed for the adsorption refrigeration cycle. The energy efficiency for electrical generation and refrigeration, as well as the exergy efficiency of the cascading cycle, was assessed. For an environmental temperature of 30 degrees C and a refrigeration temperature of 12 degrees C, the results showed that typically 1 kW of electricity and 6.3 kW of refrigeration could be generated from approximately 15 kW heating power. The electricity generation efficiency was between 0.1 and 0.15, while the refrigeration coefficient of performance was approximately 0.8. The exergy efficiency was found to be between 0.84 and 0.89 and between 0.32 and 0.46 for the single ORC and adsorption refrigeration cycle, respectively. The overall exergy efficiency was between 0.56 and 0.74.


Publication metadata

Author(s): Wang LW, Roskilly AP, Wang RZ

Publication type: Article

Publication status: Published

Journal: Heat Tranfer Engineering

Year: 2014

Volume: 35

Issue: 11-12

Pages: 1028-1034

Print publication date: 16/01/2014

ISSN (print): 0145-7632

ISSN (electronic): 1521-0537

Publisher: Taylor & Francis

URL: http://dx.doi.org/10.1080/01457632.2013.863067

DOI: 10.1080/01457632.2013.863067


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