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Experimental Investigation on Off-Design Characteristics of R290 Rolling Piston Compressor

  • Research Article-Mechanical Engineering
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Abstract

The test platform of R290 rolling piston compressor is established to study the variation of performance parameters under different conditions, including volumetric efficiency (ηV), coefficient of performance (COP), cooling capacity (Q), electric power (W), exhaust temperature (td), electrical efficiency (ηel), comprehensive efficiency coefficient (ηcom). With the increase in suction temperature (ts), COP increases by 8.3% partly due to the increase in td; ηV increases slowly in the range of 0.86–0.87 (mainly affected by temperature coefficient); ηel and ηcom increase by 3.2% and 5.6%, respectively. At variable compression ratio (π) conditions, with the decrease of Pe (VPe), COP decreases by over 25%, while with the increase of Pc (VPc), COP decreases by over 38%, which attributes to the different decline rates of W (decreasing slightly at VPe and increasing by over 30% at VPc); ηV decreases slowly (mainly affected by volume coefficient and temperature coefficient); ηel decreases with the increase of π; the decline rate of ηcom at VPc is 2–3 times that at VPe, which indicates that the frequent fluctuation of Pc will lead to the significant decrease of ηcom. This research provides experimental basis for the design and further improvement of R290 rolling piston compressor.

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Abbreviations

π :

Compression ratio

EV:

Expansion valve

EEV:

Electronic expansion valve

Q :

Cooling capacity, [W]

W :

Electric power, [W]

f :

Frequency, [Hz]

t en :

Ambient temperature, [°C]

t e :

Evaporating temperature, [°C]

t c :

Condensing temperature, [°C]

t s :

Suction temperature, [°C]

t sc :

Subcooling temperature, [°C]

t d :

Exhaust temperature, [°C]

P e :

Evaporating (suction) pressure, [Mpa]

P c :

Condensing (exhaust) pressure, [Mpa]

COP:

Coefficient of performance

w :

Work per unit mass, [kJ kg−1]

COP 0 :

Theoretical coefficient of performance

Vts:

Variable suction temperature conditions

theo-q :

Theoretical cooling capacity per unit mass, [kJ kg−1]

t asc :

Temperature after subcooling, [°C]

VPe:

Variable compression ratio (variable evaporating pressure) conditions

VPc:

Variable compression ratio (variable condensing pressure) conditions

Vπ:

Variable compression ratio conditions

η V :

Volumetric efficiency

η el :

Electrical efficiency

η com :

Comprehensive efficiency coefficient

V cc :

Power supply voltage of compressor, [V]

η i :

Indicated efficiency

η :

Efficiency (ηV, ηel or ηcom)

λ V :

Volume coefficient

λ P :

Pressure coefficient

λ T :

Temperature coefficient

λ l :

Leakage coefficient

λ h :

Reflux coefficient

q m :

Inspiratory mass flow, [kg s−1]

v suc :

Inspiratory specific volume, [m3 kg−1]

theo-w :

Theoretical work per unit mass, [kJ kg−1]

theo-COP :

Theoretical coefficient of performance

theo-h asc :

Theoretical enthalpy after subcooling, [kJ kg−1]

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Acknowledgements

This research is sponsored by the National Natural Science Foundation of China (No. 22068024).

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Authors and Affiliations

  1. School of Mechanical and Electrical Engineering, Nanchang University, Nanchang, 330031, China

    Yuande Dai & Jiantao Qiu

  2. Nanjing Wuzhou Refrigeration Group Co., Ltd, Nanjing, 211100, China

    Xiangtao Han

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  1. Yuande Dai
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  2. Jiantao Qiu
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  3. Xiangtao Han
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Correspondence to Yuande Dai.

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Dai, Y., Qiu, J. & Han, X. Experimental Investigation on Off-Design Characteristics of R290 Rolling Piston Compressor. Arab J Sci Eng 47, 8081–8091 (2022). https://doi.org/10.1007/s13369-021-06079-4

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  • DOI: https://doi.org/10.1007/s13369-021-06079-4

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