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Titolo:
Reducing cold-start emission from internal combustion engines by means of a catalytic converter embedded in a phase-change material
Autore:
Korin, E; Reshef, R; Tshernichovesky, D; Sher, E;
Indirizzi:
Ben Gurion Univ Negev, Dept Mech Engn, Pearlstone Ctr Aeronaut Engn Studies, IL-84105 Beer Sheva, Israel Ben Gurion Univ Negev Beer Sheva Israel IL-84105 4105 Beer Sheva, Israel Ben Gurion Univ Negev, Dept Chem Engn, IL-84105 Beer Sheva, Israel Ben Gurion Univ Negev Beer Sheva Israel IL-84105 4105 Beer Sheva, Israel
Titolo Testata:
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING
fascicolo: D6, volume: 213, anno: 1999,
pagine: 575 - 583
SICI:
0954-4070(1999)213:D6<575:RCEFIC>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Keywords:
cold-start emission; catalytic converters; thermal energy storage; phase-change materials;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Sher, E Ben Gurion Univ Negev, Dept Mech Engn, Pearlstone Ctr Aeronaut Engn Studies, IL-84105 Beer Sheva, Israel Ben Gurion Univ Negev Beer Sheva Israel IL-84105 r Sheva, Israel
Citazione:
E. Korin et al., "Reducing cold-start emission from internal combustion engines by means of a catalytic converter embedded in a phase-change material", P I MEC E D, 213(D6), 1999, pp. 575-583

Abstract

Under normal operating conditions, catalytic converters appear to be the most effective means of reducing air pollution from internal combustion (IC)engines. The conversion efficiency, however, declines very steeply for temperatures below about 350 degrees C and is practically zero during the starting and warming-up period. Improving the conversion efficiency under theseconditions is important, particularly in large cities, where the number ofstartings per vehicle per day tends to be high. Among the more successful solutions are preheating of the catalyst electrically, warming up of the catalyst in an external combustion chamber, installation of an auxiliary small-capacity catalytic converter, and employment of an adsorbing unit betweentwo catalysts. Although these methods are quite effective, their disadvantage lies in the fact that they require an external energy source, an additional component (a control unit) or a three-stage catalyst. In the present work an investigation was made of a solution based on the exploitation of thermal capacitance to keep the catalyst temperature high during off-operation periods. A phase-change material (PCM) with a transition temperature of 352.7 degrees C, which;is slightly above the light-off temperature of the metallic catalyst, was specially formulated, and a system comprising a catalytic converter embedded in the PCM was designed and tested. Under normal engine operating conditions, some of the thermal energy of the exhaust gases was stored in the PCM. During the time that the vehicle was not in use, the PCM underwent partial solidification, and the latent heat thus produced wasexploited to maintain the catalyst temperature within the desired temperature range for maximum conversion efficiency.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 20:46:57