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Evaporation of refrigerant HFC 407C on plain tubes or at an improved surface; Evaporation du refrigerant HFC 407C sur des tubes lisses ou a surface amelioree

Technical Report:

Abstract

The substitution of CFC refrigerants in refrigeration systems, heat pumps and organic Rankine cycles for heat recovery, requires good methods for predicting heat transfer of substitute fluids. The measurements in the LENI test facility (concentric tubes with water flowing in a counter-current flow) with HFC 407C, HFC 134a, HCFC 123, HFC 404a and HFC/HCFC 402A provide a new data bank for new refrigerants, and allow a coherent comparison with old refrigerants CFC 11, CFC 12, CFC/HCFC 502 and with existing correlations. The existing correlations were found to be inadequate. Because of this work, an improved flow pattern map and flow boiling model were developed, which resulted in a substantial progress in the accurate predict of heat transfer in plain, horizontal tubes for refrigerants without oil. The Kattan et al. correlation was programmed to calculate and compare predicted heat transfer coefficients to the new HFC 407C test data. The flow pattern map proposed by Kattan et al. was also programmed and compared to flow regimes observed for HFC 407C. It predicted the HFC 407C flow pattern data quite accurately. The original objective of the HFC 407C measurements was the validation of the Kattan et al. correlation applied to a zeotropic refrigerant  More>>
Authors:
Zuercher, O.; Favrat, D.; Thome, J. R.; Kattan, N.; Nidegger, E. [1] 
  1. Ecole polytechnique federale, Lab. d`energetique industrielle, Lausanne (Switzerland)
Publication Date:
Nov 15, 1996
Product Type:
Technical Report
Report Number:
ENET-9553972/1
Reference Number:
SCA: 420400; PA: CH-97:0E0329; EDB-97:132390; SN: 97001864473
Resource Relation:
Other Information: PBD: Nov 1996
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; REFRIGERANTS; HEAT TRANSFER; HEAT PUMPS; HALOGENATED ALIPHATIC HYDROCARBONS; CORRELATIONS; MATHEMATICAL MODELS; THEORETICAL DATA; EXPERIMENTAL DATA
Sponsoring Organizations:
Bundesamt fuer Energiewirtschaft, Bern (Switzerland)
OSTI ID:
535652
Research Organizations:
Bundesamt fuer Energiewirtschaft, Bern (Switzerland)
Country of Origin:
Switzerland
Language:
French
Other Identifying Numbers:
TRN: CH97E0329
Availability:
Available from URL http://www.bfe.admin.ch/dokumentation/energieforschung/index.html?lang=en. Enter author’s name or original publication title, or use the Text-Search option
Submitting Site:
CH
Size:
93 p.
Announcement Date:

Technical Report:

Citation Formats

Zuercher, O., Favrat, D., Thome, J. R., Kattan, N., and Nidegger, E. Evaporation of refrigerant HFC 407C on plain tubes or at an improved surface; Evaporation du refrigerant HFC 407C sur des tubes lisses ou a surface amelioree. Switzerland: N. p., 1996. Web.
Zuercher, O., Favrat, D., Thome, J. R., Kattan, N., & Nidegger, E. Evaporation of refrigerant HFC 407C on plain tubes or at an improved surface; Evaporation du refrigerant HFC 407C sur des tubes lisses ou a surface amelioree. Switzerland.
Zuercher, O., Favrat, D., Thome, J. R., Kattan, N., and Nidegger, E. 1996. "Evaporation of refrigerant HFC 407C on plain tubes or at an improved surface; Evaporation du refrigerant HFC 407C sur des tubes lisses ou a surface amelioree." Switzerland.
@misc{etde_535652,
title = {Evaporation of refrigerant HFC 407C on plain tubes or at an improved surface; Evaporation du refrigerant HFC 407C sur des tubes lisses ou a surface amelioree}
author = {Zuercher, O., Favrat, D., Thome, J. R., Kattan, N., and Nidegger, E.}
abstractNote = {The substitution of CFC refrigerants in refrigeration systems, heat pumps and organic Rankine cycles for heat recovery, requires good methods for predicting heat transfer of substitute fluids. The measurements in the LENI test facility (concentric tubes with water flowing in a counter-current flow) with HFC 407C, HFC 134a, HCFC 123, HFC 404a and HFC/HCFC 402A provide a new data bank for new refrigerants, and allow a coherent comparison with old refrigerants CFC 11, CFC 12, CFC/HCFC 502 and with existing correlations. The existing correlations were found to be inadequate. Because of this work, an improved flow pattern map and flow boiling model were developed, which resulted in a substantial progress in the accurate predict of heat transfer in plain, horizontal tubes for refrigerants without oil. The Kattan et al. correlation was programmed to calculate and compare predicted heat transfer coefficients to the new HFC 407C test data. The flow pattern map proposed by Kattan et al. was also programmed and compared to flow regimes observed for HFC 407C. It predicted the HFC 407C flow pattern data quite accurately. The original objective of the HFC 407C measurements was the validation of the Kattan et al. correlation applied to a zeotropic refrigerant blend. Local flow boiling heat transfer coefficients were measured for HFC 407C evaporating inside a microfin and a plain tube. In addition, microfin heat transfer augmentation relative to a plain tube was investigated. The presence of oil in the evaporator had a complex effect on heat transfer coefficients. Local flow boiling heat transfer coefficients were measured for refrigerant HFC 407C ester oil mixtures (Mobil EAL Arctic 68). A new thermodynamic approach for modeling mixtures of zeotropic refrigerant blends and lubricating oils was also developed. (author) figs., tabs., 14 refs.}
place = {Switzerland}
year = {1996}
month = {Nov}
}