Experimental Study on Variable-frequency Screw Compressor with Economizer under Variable Working Conditions

Qin Huanghui

doi:10.3969/j.issn.0253-4339.2018.04.123

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Experimental Study on Variable-frequency Screw Compressor with Economizer under Variable Working Conditions

更新时间：2024-07-18

- Experimental Study on Variable-frequency Screw Compressor with Economizer under Variable Working Conditions
- Journal of Refrigeration Vol. 39, Issue 4, (2018)
- 作者机构：
  
  南通航运职业技术学院
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0253-4339.2018.04.123
  CLC：
- Published：2018
- 稿件说明：
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Qin Huanghui. Experimental Study on Variable-frequency Screw Compressor with Economizer under Variable Working Conditions[J]. Journal of refrigeration, 2018, 39(4).
DOI：

Qin Huanghui. Experimental Study on Variable-frequency Screw Compressor with Economizer under Variable Working Conditions[J]. Journal of refrigeration, 2018, 39(4). DOI： 10.3969/j.issn.0253-4339.2018.04.123.

摘要

本文为提高带经济器的变频螺杆压缩机效率，实验研究了压缩机排气压力、电机频率、经济器补气压力、容积效率等参数，得出压缩机排气压力和电机频率对经济器补气压力的变化规律。当冷凝温度为40 ℃，蒸发温度为5 ℃时，电机频率从200 Hz变化至50 Hz，经济器补气压力上升了88.3 kPa；当排气压力提高30%，经济器补气压力仅上升了4.9 kPa，压缩机的容积效率仅降低约2%。结果表明：与压缩机排气压力相比，电机频率对补气压力和容积效率的影响较大。

Abstract

To improve the efficiency of a variable-frequency screw compressor with an economizer

the effect of parameters such as the discharge pressure of the compressor

motor frequency

injection pressure of the economizer

and volumetric efficiency on the efficiency of compressor were studied experiementally

and the injection pressure change rule of the economizer was obtained by changing the discharge pressure of the compressor or the motor frequency. Under the condition of a condensing temperature of 40 ℃ and evaporating temperature of 5 ℃

the economizer injection pressure rises by 88.3 kPa with the motor frequency changing from 200 Hz to 50 Hz

and only by 4.9 kPa when the discharge pressure was increased by 30%

which resulted in a 2% drop in volumetric efficiency of the compressor. The result shows that motor frequency has a greater effect on the injection pressure and volumetric efficiency compared to the discharge pressure of the compressor.

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Related Institution

School of Energy and Power Engineering, University of Shanghai for Science and Technology

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