Research and development of a semi-hermetic reciprocating compressor for transcritical CO 2 refrigeration cycle

Abstract

A semi-hermetic reciprocating compressor was designed and developed for the transcritical carbon dioxide (CO₂) refrigeration cycle. In addition, a mathematical model was established to simulate the thermodynamic process in this transcritical CO₂ compressor. The internal leakage, heat transfer, and flows through the suction/discharge valves together with the valve motion were taken into account in the model. In order to evaluate the overall performance of the developed compressor, a test rig was built to measure the volumetric efficiency, isentropic efficiency, and coefficient of performance (COP), and also recorded the pressure—volume diagram. The calculated indicated power deviated by 4.16 per cent from the measured one, and the maximum deviations of the isentropic and volumetric efficiencies were −2.86 per cent and 4.87 per cent, respectively. Both the calculated and measured data showed that the compressor had a cooling COP of 2.0—3.2. As the pressure ratio increased from 2.3 to 3.5, the volumetric and isentropic efficiencies ranged from 0.70 to 0.86 and from 0.62 to 0.66, respectively. The recorded p—V diagram indicated that the power losses associated with the suction and discharge processes accounted for 4.6 per cent and 6.8 per cent of the total indicated power, respectively. The validated model can be used to investigate the thermodynamic process of the reciprocating CO₂ compressor with the aim of enhancing the compressor efficiency.

Keywords

reciprocating compressor transcritical cycle carbon dioxide indicator diagram simulation

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References

Lorentzen

, ‘Revival of carbon dioxide as a refrigerant’ Int. J. Refrig. 17 5 (1994): 292–301.

Sub

J. S.

Kruse

, ‘Efficiency of the indicated process of CO₂ compressor’ Int. J. Refrig. 21 3 (1998): 194–201.

Yang

J. L.

Y. T.

M. X.

Guan

H. Q.

, ‘Energy analysis of transcritical carbon dioxide refrigeration cycle with an expander’ Energy 30 7 (2005): 1162–1175.

Sasaya

Ozakli

, ‘Pointing to the future: two-stage CO₂ compression. Heat transfer issues in ‘Natural’ refrigerant’ (College Park, MD: University of Maryland 1997).

Huff

H. J.

Hwang

Radermacher

, ‘Options for a two-stage transcritical carbon dioxide cycle’ In Proceedings of the IIR-Gustav Lorentzen Conference on Natural working fluids, Guangzhou, China, 2002, pp. 158–164.

Preissner

Huff

H. J.

Radermacher

, ‘Evaporatively cooled heat exchanger. Refrigerant Alternative Consortium’ (2000) Project Report.

Preissner

, Carbon dioxide vapor compression cycle improvements with focus on scroll expanders (College Park, MD: University of Maryland 2001) PhD Thesis.

Preissner

Cutler

Radermacher

, ‘Suction line heat exchanger for R134a, automotive air-conditioning system’ In Proceedings of the International Refrigeration Conference, Purdue, West Lafayette, IN, 2000, pp. 289–294.

Hihara

, ‘R&D on heat pumps with natural working fluids in Japan’ &D on heat pumps with natural working fluids in JapanProceedings of the Seventh International Energy Agency Conference on Heat pump technologies, Beijing, China, 2002, pp. 272–279.

10.

Seuss

Veje

, ‘Development and performance measurements of a small compressor for transcritical CO₂ applications’ In Proceedings of the Seventeenth International Compressor Engineering Conference, Purdue University, Purdue, 2004, C112.

11.

Danfoss. ‘Agreencompressor-cleanthinking, Commercial catalogue’ (2006) available from http://compressors.danfoss.com/products/quickreference/comp-co2-r744.htm.

12.

Sasaki

Koyatsu

Yoshikawa

Fujima

Mizuno

Kawai

Hashizume

, ‘The effectiveness of a refrigeration system using CO₂ as a working fluid in the trans-critical region’ ASHRAE Trans. 108 1 (2002): 413–418.

13.

Pettersen

Nekså

, ‘CO₂ refrigeration, air conditioning and heat pump technology development in Europe’ Mag. Soc. Air-Cond. Refrig. Engrs Korea 31 7 (2002): 53–64.

14.

Fagerli

B. E.

, ‘Development and experiences with a hermetic CO₂ compressor’ In Proceedings of the International Compressor Engineering Conference, Purdue, West Lafayette, IN, 23–26 July 1996, pp. 229–235.

15.

Suss

Kruse

, ‘Efficiency of the indicated process of CO₂ compressors’ Int. J. Refrig. 21 3 (1998): 194–205.

16.

Hwang

Radermacher

, ‘Development of hermetic carbon dioxide compressor’ In Proceedings of the InternationalRefrigerationConference, Purdue, West Lafayette, IN, 14–17 July 1998, pp. 171–175.

17.

Fukuta

Radermacher

Lindsay

Yanagisawa

, ‘Performance of vane compressor for CO2 cycle’ In Proceedings of the Fourth IIR-Gustav Lorentzen Conference on Natural working fluids, West Lafayette, IN, 2000, pp. 229–246.

18.

Hwang

Muehlbauer

Radermacher

, ‘Performance evaluation of a two-stage carbon dioxide compressor’ In Proceedings of the 6th Gustav Lorentzen NaturalWorking Fluids Conference, Glasgow, UK, 2004.

19.

Ooi

K. T.

Wong

T. N.

, ‘A computer simulation of a rotary compressor for household refrigerators’ Appl. Therm. Eng. 17 1 (1997): 65–78.

20.

Ooi

K. T.

, ‘Design optimization of a rolling piston compressor for refrigerators’ Appl. Therm. Eng. 25 5–6 (2005): 813–829.

21.

Nekså

Dorin

Rekstad

Bredesen

Serbisse

, ‘Development of semi-hermetic CO₂-compressors’ In Proceedings of the 20th International Congress on Refrigeration, IIR/IIF, Sydney, 1999, pp. 424–431.

22.

Nekså

Dorin

Rekstad

Bredesen

, ‘Development of two-stage semi-hermetic CO₂-compressors’ In Proceedings of the 4th IIR-Gustav Lorentzen Conference on Natural working fluids, Purdue University, USA, 2000.

23.

Hubacher

Groll

E. A.

Hoffinger

, ‘Performance measurements of a semi-hermetic carbon dioxide compressor’ In Proceedings of the International Refrigeration Conference, Purdue, West Lafayette, IN, 2002, p. R11–10.

24.

Ooi

K. T.

, ‘Assessment of a rotary compressor performance operating at transcritical carbon dioxide cycles’ Appl. Therm. Eng. 28 10 (2008): 1160–1167.

25.

Tadano

Ebara

Oda

, ‘Development of the CO₂ hermetic compressor’ In Proceedings of the 4th IIRGustav Lorentzen Conference onNatural working fluids, Purdue University, West Lafayette, IN, 25–28 July 2000, pp. 323–330.

26.

Rajewski

T. E.

, ‘Experimental study of lubricant candidates for the CO₂ refrigeration system’ In Proceedings of the 4th IIR-Gustav Lorenten Conference on Natural working fluids, Purdue University, Purdue, 2000, pp. 409–416.

27.

‘Thermodynamic properties of refrigerants and refrigerant mixtures database (REFPROP)’ (Gaithersburg, MD: National Institute of Standards and Technology 2008).

28.

Kreyszig

, Advanced engineering mathematics 5th edition, (New Delhi, Bangalore: New Age International (P) Limited, Publishers 1997).

29.

Moffat

R. J.

, ‘Describing the uncertainties in experimental results’ Expl Therm. Fluid Sci. 1 (1981): 3–17.