Effects caused by the internal heat exchanger at the low temperature cycle in a cascade refrigeration plant
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Títol
Effects caused by the internal heat exchanger at the low temperature cycle in a cascade refrigeration plantAutoria
Data de publicació
2016Editor
ElsevierISSN
1359-4311; 1873-5606Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://www.sciencedirect.com/science/article/pii/S1359431116305622Paraules clau / Matèries
Resum
This work analyses and quantifies the effects caused by the use of an internal heat exchanger (IHX) at the
CO2 subcritical cycle in an HFC134a/CO2 cascade refrigeration plant that incorporates a gas-cooler at the
exit ... [+]
This work analyses and quantifies the effects caused by the use of an internal heat exchanger (IHX) at the
CO2 subcritical cycle in an HFC134a/CO2 cascade refrigeration plant that incorporates a gas-cooler at the
exit of the low temperature compressor. Previous theoretical and experimental studies showed that the
IHX reduces the refrigeration capacity and COP of the subcritical cycle, however, it has been seen that it
also lowers the heat to be rejected at the condenser. This reduction, when the cycle is a part of a cascade
system, allows reducing the heat load of the high temperature cycle, modifying the working conditions of
the cascade plant. The modifications result in an increment of the overall coefficient of performance of the
cascade system. The analysis here presented is based on the evaluation of an experimental
HFC134a/CO2 refrigeration plant, which has been analysed with and without internal heat exchanger in an
evaporating temperature range from -40 to -30 ºC and in a condensing one from 30 to 50 ºC. The plant
incorporates a gas-cooler at the exit of the CO2 compressor. The experimental results confirm that the IHX
slightly reduces the cooling capacity but it can increment the overall COP up to 3.7 %. [-]
Publicat a
Applied Thermal Engineering 103 (2016) 1077–1086Drets d'accés
2016 Elsevier Ltd. All rights reserved.
http://rightsstatements.org/vocab/InC/1.0/
info:eu-repo/semantics/openAccess
http://rightsstatements.org/vocab/InC/1.0/
info:eu-repo/semantics/openAccess
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