This paper studies the influence of working fluids over the performance of heat driven ejector refrigeration systems performance by using a lumped parameter model. The model used has been selected after a comparison of different models with a set of experimental data available in the literature. The effect of generator, evaporator and condenser temperature over the entrainment ratio and the COP has been investigated for different working fluids in the typical operating conditions of low grade energy sources. The results show a growth in performance (the entrainment ratio and the COP) with a rise in the generator and evaporator temperature and a decrease in the condenser temperature. The working fluids have a great impact on the ejector performance and each refrigerant has its own range of operating conditions. R134a is found to be suitable for low generator temperature (70-100 degrees C), whereas the hydrocarbons R600 is suitable for medium generator temperatures (100-130 degrees C) and R601 for high generator temperatures (130-180 degrees C). (C) 2015 Elsevier Ltd and IIR. All rights reserved.

A study of working fluids for heat driven ejector refrigeration using lumped parameter models

BESAGNI, GIORGIO;MEREU, RICCARDO;INZOLI, FABIO
2015-01-01

Abstract

This paper studies the influence of working fluids over the performance of heat driven ejector refrigeration systems performance by using a lumped parameter model. The model used has been selected after a comparison of different models with a set of experimental data available in the literature. The effect of generator, evaporator and condenser temperature over the entrainment ratio and the COP has been investigated for different working fluids in the typical operating conditions of low grade energy sources. The results show a growth in performance (the entrainment ratio and the COP) with a rise in the generator and evaporator temperature and a decrease in the condenser temperature. The working fluids have a great impact on the ejector performance and each refrigerant has its own range of operating conditions. R134a is found to be suitable for low generator temperature (70-100 degrees C), whereas the hydrocarbons R600 is suitable for medium generator temperatures (100-130 degrees C) and R601 for high generator temperatures (130-180 degrees C). (C) 2015 Elsevier Ltd and IIR. All rights reserved.
2015
Ejector; Working fluids; COP; Entrainment ratio; Ejector refrigeration; Ejector efficiencies
File in questo prodotto:
File Dimensione Formato  
2015_IJR_Besagni_et_al.pdf

Accesso riservato

Descrizione: Paper IJR
: Altro materiale allegato
Dimensione 4.04 MB
Formato Adobe PDF
4.04 MB Adobe PDF   Visualizza/Apri
11311-984234_Besagni.pdf

accesso aperto

: Post-Print (DRAFT o Author’s Accepted Manuscript-AAM)
Dimensione 4.05 MB
Formato Adobe PDF
4.05 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/984234
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 52
  • ???jsp.display-item.citation.isi??? 45
social impact