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Evaporation of new refrigerants on tubes with improved surfaces; Evaporation de nouveaux refrigerants sur des tubes a surface amelioree

Technical Report:

Abstract

The substitution of old refrigerants in refrigeration systems, heat pumps and organic Rankine cycles for heat recovery, request a good knowledge of heat transfer properties of substitute fluids. The test measurements in LENI test facility (concentric tubes with water flowing in a counter-current flow) with new refrigerants like HFC134a, HCFC123, R-404A, R-402A, have established a new data bank with new refrigerants, a comparison with old refrigerants like CFC11, CFC12 CFC/HCFC502 and with existent correlations. Correlations were programmed to calculate and compare heat transfer coefficient during the tests. To develop a new correlation based on flow regimes, a high speed Sony video tape camera is used to observe and identify flow patterns. Important images are captured, digitalized, stored for later analysis and sent to a color plotter. Several flow pattern maps were programmed and compared to flow regimes observed on the test rig. Local flow boiling heat transfer coefficients were measured for HFC134a and HCFC123 evaporating inside a microfin tube. In addition, microfin heat transfer augmentation relative to plain tube test data was investigated. The presence of oil in the evaporator has an effect on heat transfer coefficient. Local flow boiling heat transfer coefficients were measured for refrigerant HFC134a-oil ester (Mobil  More>>
Authors:
Kattan, N.; Favrat, D.; Thome, J. R.; Nidegger, E.; Zuercher, O. [1] 
  1. Ecole Polytechnique Federale, Lab. d`Energetique Industrielle (LENI), Lausanne (Switzerland)
Publication Date:
Jul 15, 1995
Product Type:
Technical Report
Report Number:
ENET-9200891/4
Reference Number:
SCA: 420400; 320106; PA: CH-96:0E0110; EDB-96:088285; SN: 96001593536
Resource Relation:
Other Information: PBD: Jul 1995
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; HEAT PUMPS; REFRIGERANTS; HEAT TRANSFER; LUBRICATING OILS; CORRELATIONS; DATA BASE MANAGEMENT; VIDEO TAPES; NUMERICAL DATA
Sponsoring Organizations:
Bundesamt fuer Energiewirtschaft, Bern (Switzerland)
OSTI ID:
229130
Research Organizations:
Bundesamt fuer Energiewirtschaft, Bern (Switzerland)
Country of Origin:
Switzerland
Language:
French
Other Identifying Numbers:
TRN: CH96E0110
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:
53 p.
Announcement Date:

Technical Report:

Citation Formats

Kattan, N., Favrat, D., Thome, J. R., Nidegger, E., and Zuercher, O. Evaporation of new refrigerants on tubes with improved surfaces; Evaporation de nouveaux refrigerants sur des tubes a surface amelioree. Switzerland: N. p., 1995. Web.
Kattan, N., Favrat, D., Thome, J. R., Nidegger, E., & Zuercher, O. Evaporation of new refrigerants on tubes with improved surfaces; Evaporation de nouveaux refrigerants sur des tubes a surface amelioree. Switzerland.
Kattan, N., Favrat, D., Thome, J. R., Nidegger, E., and Zuercher, O. 1995. "Evaporation of new refrigerants on tubes with improved surfaces; Evaporation de nouveaux refrigerants sur des tubes a surface amelioree." Switzerland.
@misc{etde_229130,
title = {Evaporation of new refrigerants on tubes with improved surfaces; Evaporation de nouveaux refrigerants sur des tubes a surface amelioree}
author = {Kattan, N., Favrat, D., Thome, J. R., Nidegger, E., and Zuercher, O.}
abstractNote = {The substitution of old refrigerants in refrigeration systems, heat pumps and organic Rankine cycles for heat recovery, request a good knowledge of heat transfer properties of substitute fluids. The test measurements in LENI test facility (concentric tubes with water flowing in a counter-current flow) with new refrigerants like HFC134a, HCFC123, R-404A, R-402A, have established a new data bank with new refrigerants, a comparison with old refrigerants like CFC11, CFC12 CFC/HCFC502 and with existent correlations. Correlations were programmed to calculate and compare heat transfer coefficient during the tests. To develop a new correlation based on flow regimes, a high speed Sony video tape camera is used to observe and identify flow patterns. Important images are captured, digitalized, stored for later analysis and sent to a color plotter. Several flow pattern maps were programmed and compared to flow regimes observed on the test rig. Local flow boiling heat transfer coefficients were measured for HFC134a and HCFC123 evaporating inside a microfin tube. In addition, microfin heat transfer augmentation relative to plain tube test data was investigated. The presence of oil in the evaporator has an effect on heat transfer coefficient. Local flow boiling heat transfer coefficients were measured for refrigerant HFC134a-oil ester (Mobil EAL Arctic 68). A new thermodynamic approach for modeling mixtures of refrigerants and lubricating oils is developed. A very high accuracy, straight vibrating tube type of density flowmeter is used to measure oil concentrations of flowing HFC134a-oil mixtures. (author) 28 figs., 25 refs.}
place = {Switzerland}
year = {1995}
month = {Jul}
}