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Titolo:
Thermodynamic optimization of finned crossflow heat exchangers for aircraft environmental control systems
Autore:
Vargas, JVC; Bejan, A;
Indirizzi:
Duke Univ, Sch Engn, Dept Mech Engn & Mat Sci, Durham, NC 27708 USA Duke Univ Durham NC USA 27708 t Mech Engn & Mat Sci, Durham, NC 27708 USA
Titolo Testata:
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
fascicolo: 6, volume: 22, anno: 2001,
pagine: 657 - 665
SICI:
0142-727X(200112)22:6<657:TOOFCH>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
2ND LAW ANALYSIS; DESIGN; FLOW;
Keywords:
entropy generation minimization; optimal geometry; constructal design; geometry; topology; thermodynamic optimization; crossflow heat exchangers; finned surfaces;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Bejan, A Duke Univ, Sch Engn, Dept Mech Engn & Mat Sci, Box 90300, Durham,NC 27708USA Duke Univ Box 90300 Durham NC USA 27708 0300, Durham, NC 27708USA
Citazione:
J.V.C. Vargas e A. Bejan, "Thermodynamic optimization of finned crossflow heat exchangers for aircraft environmental control systems", INT J HEA F, 22(6), 2001, pp. 657-665

Abstract

This paper shows that the main geometric features of a flow component can be deduced from the thermodynamic optimization of the global performance ofthe largest flow system that incorporates the component. This approach represents a departure from the usual approach, where a flow component is optimized in isolation. The example chosen is the counterflow heat exchanger ofthe environmental control system (ECS) used on modern aircraft. The heat exchanger is fitted. with a diffuser and a nozzle for the ram air, and the ECS runs on the boot strap air cycle, employing an additional compressor andturbine. Two heat transfer surface types are considered, finned and smoothparallel plates. Numerical results are reported for the external geometricaspect ratios of the heat exchanger, and for the plate-to-plate spacing ofthe smooth-plates model. It is shown that the optimized geometry for the core with finned surfaces is nearly the same as the optimized geometry for the core with smooth plates. Several of the optimized geometric features arerobust with respect to changes in external parameters that vary from one application to the next. The method illustrated in this paper - the thermodynamic (constructal) optimization of flow geometry - is applicable to any system that runs on the basis of a limited amount of fuel (exergy) installed onboard, e.g., automobiles, ships, portable tools. (C) 2001 Elsevier Science Inc. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 16/07/20 alle ore 06:23:58