Summary
The paper presents experimental results of the study of heat rejection from CO2 near the critical pressure: above it and below it, both in superheated and in two phase zone. The experimental data on HTC (heat transfer coefficient) and pressure drop in a horizontal smooth tube of inner diameter 6.1 mm at the pressure 5 to 7.5 MPa, enthalpy 280 to 450 kJ*kg-1, mass flux 100 to 250 kg*m-2*s-1, and heat flux 3 to 30 kW*m-2 are provided. Experimental results are compared with correlations proposed for CO2 when available and for other refrigerants. In the results, the occurrence of condensation in superheat zone was indicated from the experimental HTC much higher than correlation proposed for single phase turbulent HTC and tube wall temperature below the saturation temperature.
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Details
- Original title: Heat rejection from R744 near the critical point.
- Record ID : 30000999
- Languages: English
- Source: 2010 Purdue Conferences. 13th International Refrigeration and Air-Conditioning Conference at Purdue.
- Publication date: 2010/12
Links
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Indexing
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Themes:
Heat transfer;
CO2 - Keywords: Heat; Heat transfer; Critical point; Expérimentation; Refrigerant; Condensation; CO2
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Heat rejection from R744 flow under uniform tem...
- Author(s) : KONDOU C., HRNJAK P.
- Date : 2011/05
- Languages : English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 34 - n. 3
- Formats : PDF
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Heat transfer and various convection structures...
- Author(s) : CHEN L., ZHANG X. R.
- Date : 2014/11
- Languages : English
- Source: Applied Thermal Engineering - vol. 72 - n. 1
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Excellent heat rejection from CO2 near the crit...
- Author(s) : KONDOU C., HRNJAK P.
- Date : 2010/06/13
- Languages : English
- Source: IIR/Eurotherm sustainable refrigeration and heat pump technology conference. Proceedings of the Eurotherm Seminar No. 88, Stockholm, Sweden, June 13-16, 2010.
- Formats : PDF
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Preliminary experimental results of CO2 gas-coo...
- Author(s) : HASHIMOTO K., SAIKAWA M.
- Date : 1997/11/06
- Languages : English
- Source: Heat transfer issues in "natural" refrigerants. International conference.
- Formats : PDF
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Heat transfer to supercritical carbon dioxide i...
- Author(s) : WALISCH T., TREPP C.
- Date : 1997/10/02
- Languages : English
- Source: Compression systems with natural working fluids. International R&D on heat pump, air conditioning and refrigerating systems. Workshop proceedings.
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