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Titolo:
Performance analysis of a closed regenerated brayton heat pump with internal irreversibilities
Autore:
Chen, LG; Ni, N; Wu, C; Sun, FR;
Indirizzi:
USN Acad, Dept Mech Engn, Annapolis, MD 21402 USA USN Acad Annapolis MD USA 21402 , Dept Mech Engn, Annapolis, MD 21402 USA
Titolo Testata:
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
fascicolo: 12, volume: 23, anno: 1999,
pagine: 1039 - 1050
SICI:
0363-907X(19991010)23:12<1039:PAOACR>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
FINITE-TIME THERMODYNAMICS; POWER-PLANTS; EFFICIENCY; ENGINE;
Keywords:
Brayton heat pump; irreversibilities;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Wu, C USN Acad, Dept Mech Engn, 121 Blake Rd, Annapolis, MD 21402 USA USN Acad 121 Blake Rd Annapolis MD USA 21402 Annapolis, MD 21402 USA
Citazione:
L.G. Chen et al., "Performance analysis of a closed regenerated brayton heat pump with internal irreversibilities", INT J ENERG, 23(12), 1999, pp. 1039-1050

Abstract

This paper analyses the performance of a real heat pump plant via methods of entropy generation minimization or finite-time thermodynamics. The analytical relations between heating load and pressure ratio, and between coefficient of performance (COP) and pressure ratio of real closed regenerated Brayton heat pump cycles coupled to constant- and variable-temperature heat reservoirs are derived. In the analysis, the irreversibilities include heat transfer-irreversible losses in the hot- and cold-side heat exchangers and the regenerator, the non-isentropic expansion and compression losses in thecompressor and expander, and the pressure drop loss in the pipe and system. The optimal performance characteristics of the cycle may be obtained by optimizing the distribution of heat conductances or heat transfer surface areas among the two heat exchangers and the regenerator, and the matching between working fluid and the heat reservoirs. The influence of the effectiveness of regenerator, the effectiveness of hot- and cold-side heat exchangers, the efficiencies of the expander and compressor, the pressure recovery coefficient and the temperature of the heat reservoirs on the heating load and COP of the cycle are illustrated by numerical examples. Published in 1999by John Wiley & Sons, Ltd.

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Documento generato il 31/05/20 alle ore 13:28:39