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Energies 2015, 8(6), 6215-6229; doi:10.3390/en8066215

Finite Time Analysis of a Tri-Generation Cycle

1
School of Mechanical and Systems Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
2
Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
3
School of Marine Sciences and Technology, Newcastle University International Singapore (NUIS), Singapore 599493
*
Author to whom correspondence should be addressed.
Academic Editor: Chang Sik Lee
Received: 28 February 2015 / Revised: 13 June 2015 / Accepted: 15 June 2015 / Published: 23 June 2015
(This article belongs to the Special Issue Tri-Generation Cycles, Combined Heat, Power and Cooling (CHPC))
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Abstract

A review of the literature indicates that current tri-generation cycles show low thermal performance, even when optimised for maximum useful output. This paper presents a Finite Time analysis of a tri-generation cycle that is based upon coupled power and refrigeration Carnot cycles. The analysis applies equally well to Stirling cycles or any cycle that exhibits isothermal heat transfer with the environment and is internally reversible. It is shown that it is possible to obtain a significantly higher energy utilisation factor with this type of cycle by considering the energy transferred during the isothermal compression and expansion processes as useful products thus making the energy utilisation larger than the enthalpy drop of the working fluid of the power cycle. The cycle is shown to have the highest energy utilisation factor when energy is supplied from a low temperature heat source and in this case the output is biased towards heating and cooling. View Full-Text
Keywords: tri-generation; finite time; combined cooling heat and power cycles (CCHPC); Carnot cycle tri-generation; finite time; combined cooling heat and power cycles (CCHPC); Carnot cycle
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Agnew, B.; Walker, S.; Ng, B.; Tam, I.C.K. Finite Time Analysis of a Tri-Generation Cycle. Energies 2015, 8, 6215-6229.

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