Experimental investigation of the heating performance of refrigerant injection heat pump with a single-cylinder inverter-driven rotary compressor

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Abstract

Applying the refrigerant injection technology to air-source heat pump had been proved to be an effective access to acquire a better performance in the cold regions. In this paper, the test-bed of R410A single-cylinder rotary compressor vapor injection (SCRCVI) system with flash tank was built and measured by changing the compressor frequency f and injection pressure Pinj under various ambient temperatures. The experimental results indicated that the effect of refrigerant injection became stronger as the ambient temperature decreased. So the SCRCVI showed a superior heating performance at lower ambient temperature, and the conventional single-stage vapor compression (CSVC) system would exhibit higher COPh, while the ambient temperature was beyond the critical value. Compared with the CSVC system, the Qh and COPh were improved by 9.1 ~ 29.5 and 5.35 ~ 7.89%, respectively, under the ambient temperature Tod = − 10 °C. The injection pressure ratio Rp under different operating conditions was varied in the range between 0.2 and 0.22. Specifically, the trend in variation of Rp was reliably used to optimize the refrigerant injection system design and the control strategy.

Keywords

Rotary compressor Refrigerant injection Flash tank Heat pump Heating performance Variable speed 

Abbreviation

COP

Coefficient of performance

CSVC

Conventional single-stage vapor compression

EEV

Electronic expansion valve

FTVIC

Flash tank vapor injection

SCRCVI

Single-cylinder rotary compressor vapor injection

SCVIC

Sub-cooler vapor injection

TCRCVI

Twin-cylinder rotary compressor vapor injection

List of symbols

f

Compressor frequency

h

Specific enthalpy (J kg−1)

\(\dot m\)

Mass flow rate (kg s−1)

P

Pressure (kPa)

Q

Capacity (W)

Rm

Injection mass flow ratio

Rp

Injection pressure ratio

T

Temperature (K)

W

Power consumption (W)

Subscripts

air

Air side

com

Compressor

DB

Dry bulb temperature

dis

Discharge

h

Heating

inj

Injection

in

Air inlet

m

Mass

od

Outdoor

out

Air outlet

s

Suction

to

Total

WB

Wet bulb temperature

WC

Working chamber

Notes

Acknowledgements

This research was supported by the South Wisdom Valley Innovative Research Team Program (Serial Number: Shunde District of Foshan City Government Office [2014] No. 365) and the 2017 Guangzhou Collaborative Innovation Major Projects (Nos. 201604016048 and 201604016069).

References

  1. 1.
    Heo J, Jeong MW, Baek C, Kim Y. Comparison of the heating performance of air-source heat pumps using various types of refrigerant injection. Int J Refrig. 2011;34:444–53.CrossRefGoogle Scholar
  2. 2.
    Xu X, Hwang Y, Radermacher R. Refrigerant injection for heat pumping/air conditioning systems: literature review and challenges discussions. Int J Refrig. 2011;34:402–15.CrossRefGoogle Scholar
  3. 3.
    Banister CJ, Collins MR. Development and performance of a dual tank solar-assisted heat pump system. Appl Energy. 2015;149:125–32.CrossRefGoogle Scholar
  4. 4.
    Lv X, Yan G, Yu J. Solar-assisted auto-cascade heat pump cycle with zeotropic mixture R32/R290 for small water heaters. Renew Energy. 2015;76:167–72.CrossRefGoogle Scholar
  5. 5.
    Lazzarin R, Noro M. Experimental comparison of electronic and thermostatic expansion valves performances in an air conditioning plant. Int J Refrig. 2008;31:113–8.CrossRefGoogle Scholar
  6. 6.
    Adhikari RS, Aste N, Manfren M, Marini D. Energy savings through variable speed compressor heat pump systems. Energy Procedia. 2012;14:1337–42.CrossRefGoogle Scholar
  7. 7.
    Raveendran PS, Sekhar SJ. Exergy analysis of a domestic refrigerator with brazed plate heat exchanger as condenser. J Therm Anal Calorim. 2017;127:2439–46.Google Scholar
  8. 8.
    Saravanakumar R, Selladurai V. Exergy analysis of a domestic refrigerator using eco-friendly R290/R600a refrigerant mixture as an alternative to R134a. J Therm Anal Calorim. 2014;115:933–40.CrossRefGoogle Scholar
  9. 9.
    Rashidi S, Mahian O, Languri EM. Applications of nanofluids in condensing and evaporating systems. J Therm Anal Calorim. 2018;131:2027–39.CrossRefGoogle Scholar
  10. 10.
    Qiao H, Aute V, Radermacher R. Transient modeling of a flash tank vapor injection heat pump system—part I: model development. Int J Refrig. 2015;49:169–82.CrossRefGoogle Scholar
  11. 11.
    Liu Z, Soedel W, editors. An investigation of compressor slugging problems. International compressor engineering conference. Purdue; 1994.Google Scholar
  12. 12.
    Anand S, Tyagi SK. Exergy analysis and experimental study of a vapor compression refrigeration cycle. J Therm Anal Calorim. 2012;110:961–71.CrossRefGoogle Scholar
  13. 13.
    Sánta R, Garbai L. Measurement testing of heat transfer coefficients in the evaporator and condenser of heat pumps. J Therm Anal Calorim. 2015;119:2099–106.CrossRefGoogle Scholar
  14. 14.
    Róbert S, Garbai L, Fürstner I. Numerical investigation of the heat pump system. J Therm Anal Calorim. 2017;130:1133-44.CrossRefGoogle Scholar
  15. 15.
    Ma G-Y, Zhao H-X. Experimental study of a heat pump system with flash-tank coupled with scroll compressor. Energy Build. 2008;40:697–701.CrossRefGoogle Scholar
  16. 16.
    Wang B, Shi W, Han L, Li X. Optimization of refrigeration system with gas-injected scroll compressor. Int J Refrig. 2009;32:1544–54.CrossRefGoogle Scholar
  17. 17.
    Wang B, Li X, Shi W. A general geometrical model of scroll compressors based on discretional initial angles of involute. Int J Refrig. 2005;28:958–66.CrossRefGoogle Scholar
  18. 18.
    Wang B, Shi W, Li X. Numerical analysis on the effects of refrigerant injection on the scroll compressor. Appl Therm Eng. 2009;29:37–46.CrossRefGoogle Scholar
  19. 19.
    Wang B, Shi W, Li X, Yan Q. Numerical research on the scroll compressor with refrigeration injection. Appl Therm Eng. 2008;28:440–9.CrossRefGoogle Scholar
  20. 20.
    Xu X, Hwang Y, Radermacher R. Transient and steady-state experimental investigation of flash tank vapor injection heat pump cycle control strategy. Int J Refrig. 2011;34:1922–33.CrossRefGoogle Scholar
  21. 21.
    Qiao H, Xu X, Aute V, Radermacher R. Transient modeling of a flash tank vapor injection heat pump system—part II: simulation results and experimental validation. Int J Refrig. 2015;49:183–94.CrossRefGoogle Scholar
  22. 22.
    Ko Y, Park S, Jin S, Kim B, Jeong JH. The selection of volume ratio of two-stage rotary compressor and its effects on air-to-water heat pump with flash tank cycle. Appl Energy. 2013;104:187–96.CrossRefGoogle Scholar
  23. 23.
    Heo J, Jeong MW, Kim Y. Effects of flash tank vapor injection on the heating performance of an inverter-driven heat pump for cold regions. Int J Refrig. 2010;33:848–55.CrossRefGoogle Scholar
  24. 24.
    Heo J, Yun R, Kim Y. Simulations on the performance of a vapor-injection heat pump for different cylinder volume ratios of a twin rotary compressor. Int J Refrig. 2013;36:730–44.CrossRefGoogle Scholar
  25. 25.
    Heo J, Kang H, Kim Y. Optimum cycle control of a two-stage injection heat pump with a double expansion sub-cooler. Int J Refrig. 2012;35:58–67.CrossRefGoogle Scholar
  26. 26.
    Ma M, Huang B, Geng W, Zhu F. Performance investigation of the vapor-injection rotary compressor for residential heat pump systems. J Refrig. 2012;33:52–4 (in Chinese).Google Scholar
  27. 27.
    Jia Q, Feng L, Yan G. Experimental research on heating performance of rotary compression system with vapor injection. J Refrig. 2015;36:65–70 (in Chinese).Google Scholar
  28. 28.
    Jia Q, Feng L, Yan G. Experimental research on rotary compression system with vapor injection. Refrig Air Cond. 2014;14:128–32 (in Chinese).Google Scholar
  29. 29.
    Wang B, Liu X, Shi W. Comparative research on air conditioner with gas-injected rotary compressor through injection port on blade. Appl Therm Eng. 2016;106:67–75.CrossRefGoogle Scholar
  30. 30.
    Liu X, Wang B, Shi W, Zhang P. A novel vapor injection structure on the blade of a rotary compressor. Appl Therm Eng. 2016;100:1219–28.CrossRefGoogle Scholar
  31. 31.
    Wang B, Liu X, Shi W. Performance improvement of air source heat pump using gas-injected rotary compressor through port on blade. Int J Refrig. 2017;73:91–8.CrossRefGoogle Scholar

Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  • Jinfei Sun
    • 1
    • 2
    • 3
    • 4
  • Dongsheng Zhu
    • 1
    • 2
    • 3
  • Yingde Yin
    • 1
    • 2
    • 3
  • Xiuzhen Li
    • 1
    • 2
    • 3
    • 4
  1. 1.Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhouChina
  2. 2.Key Laboratory of Renewable EnergyChinese Academy of SciencesGuangzhouChina
  3. 3.Guangdong Key Laboratory of New and Renewable Energy Research and DevelopmentGuangzhouChina
  4. 4.University of Chinese Academy of SciencesBeijingChina

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