A comprehensive study of two-stage vapor compression cycles with vapor-injection for heating applications, taking into account heat sink of finite capacity

•Determination of influential variables on the optimum COP in two-stage cycles.•Thermodynamic optimization of two-stage cycles with vapor-injection with economizer and flash tank.•Analysis of the influence of the subcooling on the optimum COP in two-stage cycles.•Correlation to estimate the optimum...

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Bibliographic Details
Published in:International journal of refrigeration 2018-09, Vol.93, p.52-64
Main Authors: Tello-Oquendo, Fernando M., Navarro-Peris, Emilio, Gonzálvez-Maciá, José
Format: Article
Language:English
Subjects:
Chemical vapor deposition
Compression bi-étagée
Correlation
Economizer
Finite capacity
Flash tank
Heat sinks
Heating
Injection de vapeur
Intermediate pressure
Optimisation
Optimization
Parameter identification
Pression intermédiaire
Pressure
Réservoir de détente
Two-stage compression
Vapor-injection
Vapors
Économiseur
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Summary:•Determination of influential variables on the optimum COP in two-stage cycles.•Thermodynamic optimization of two-stage cycles with vapor-injection with economizer and flash tank.•Analysis of the influence of the subcooling on the optimum COP in two-stage cycles.•Correlation to estimate the optimum intermediate pressure in two-stage cycles.•Study of the influence of the size of the system components on the COP. This paper presents a comprehensive study of two-stage vapor compression cycles with vapor-injection for several refrigerants considering that the heat sink has a limited capacity. The key parameters of the cycle performance are identified and the influence of these parameters on the heating COP is analyzed. The optimum intermediate conditions of the cycle are evaluated using a general model of the cycle, considering two configurations (flash tank and economizer). Based on the optimization results, a correlation is proposed in order to estimate the optimum intermediate pressure, taking into account the temperature lift in the secondary fluid imposed by the application. The correlation uses cycle subcooling as an input, which is a novelty from the current correlations proposed in the literature. In addition, an optimum subcooling control strategy is proposed and finally, the influence of the size of the system components on the COP is studied.
ISSN:0140-7007
1879-2081
DOI:10.1016/j.ijrefrig.2018.05.039