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The objective of this study is to investigate the effects of vapor injection techniques on the heating performance of a CO2 heat pump. The performances of the flash tank vapor injection (FTVI), sub-cooler vapor injection (SCVI) and FTVI with a suction line heat exchanger (FTSX) cycles were measured and analyzed with variations of the outdoor temperature, compressor frequency, and injection mass flow rate. At the outdoor temperature of -15°C and compressor frequency of 55 Hz, the heating capacity and COP of the optimized SCVI cycle were 12.1% and 12.7% higher than those of the optimized FTVI cycle, respectively, because the total mass flow rate in the SCVI cycle was higher than that in the FTVI cycle by the large temperature and pressure differences in the sub-cooler of the SCVI cycle. In addition, the optimum injection flow rate ratios in the vapor injection CO2 cycles yielding the maximum COP were determined at various compressor frequencies.
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Details
- Original title: Effects of vapor injection techniques on the heating performance of a CO2 heat pump at low ambient temperatures.
- Record ID : 30011639
- Languages: English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 43
- Publication date: 2014/07
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Indexing
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Themes:
Heat pumps techniques;
CO2 - Keywords: Vapour; Two-stage system; Heat pump; Performance; Injection; Frequency; Heating; Compressor; CO2
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Experimental study on two-stage compression ref...
- Author(s) : XU S., MA G.
- Date : 2014/01
- Languages : English
- Source: Applied Thermal Engineering - vol. 62 - n. 2
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Numerical analysis and optimization of CO2 vapo...
- Author(s) : KIM S., KIM M. S.
- Date : 2018/06/18
- Languages : English
- Source: 13th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2018). Proceedings. Valencia, Spain, June 18-20th 2018.
- Formats : PDF
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Effect of different injection vapor modes on th...
- Author(s) : LIU B., GU S., CHEN A., et al.
- Date : 2017/07/20
- Languages : English
- Source: 8th international conference on compressors and refrigeration, 2017.
- Formats : PDF
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Performance of air-to-water heat pump using 2 s...
- Author(s) : KO Y., JIN S., HA S., et al.
- Date : 2010/07/12
- Languages : English
- Source: 2010 Purdue Conferences. 13th International Refrigeration and Air-Conditioning Conference at Purdue.
- Formats : PDF
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Developing an injection type two-stage rotary c...
- Author(s) : YOKOYAMA T., SASAKI K., SEKIYA S., et al.
- Date : 2009
- Languages : English
- Source: Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers - vol. 26 - n. 3
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