Heat transfer coefficient, two-phase flow boiling of HFC134a
Creators
- 1. Royal Inst. of Technology, Dept. of Applied Thermodynamics and Refrigeration, S-100 44 Stockholm (Sweden)
Description
Evaporation of HFC134a inside smooth, horizontal tubes is studied. Tests are made with pure refrigerant and with oil-refrigerant mixtures. Heat flux has varied from 2 kW/m2 to 10 kW/m2. The inner diameter of the tubes are 12 mm. Two evaporators are used, 4 and 10 m long. Oil content is varied from 0 to 2.5 mass percentage (synthetic oil, EXP-0275). Oil free HFC134a is found to have higher heat transfer coefficient than HCF22 at the same heat flux, as well as mass flux. The effect of oil in the refrigerant depends on the flux. At 2 and 4 kW/m2, the heat transfer coefficient has a maximum value for an oil content of around 0.5 mass percentage. No increase at all is registered for a heat flux of 6 kW/m2. Heat transfer coefficients for pure refrigerant are also compared to existing correlations. Pierre's correlation predict values with a reasonable accuracy
Additional details
Publishing Information
- Publisher
- Purdue Univ. Press.
- Imprint Place
- West Lafayette, IN (USA)
- Imprint Title
- Proceedings of the 1990 USNC/IIR-Purdue refrigeration conference and the 1990 ASHRAE-Purdue CFC conference
- Imprint Pagination
- 500 p.
- Journal Page Range
- p. 205-214.
Conference
- Title
- USNC/IIR Purdue refrigeration conference and the ASHRAE Purdue CFC conference.
- Dates
- 17-20 Jul 1990.
- Place
- West Lafayette, IN (USA).
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 22023047
- Subject category
- S42: ENGINEERING; S36: MATERIALS SCIENCE;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- COOLING SYSTEMS; HALOGEN COMPOUNDS; HEAT FLUX; HEAT TRANSFER; REFRIGERANTS; THERMODYNAMIC PROPERTIES; TUBES; TWO-PHASE FLOW
- Descriptors DEC
- ENERGY TRANSFER; FLUID FLOW; PHYSICAL PROPERTIES
Optional Information
- Secondary number(s)
- CONF-9007177--.