Heating performance of space heating heat pump based on dual-cylinder rotary compressor in ultra-low temperature

doi:10.11949/0438-1157.20190247

Abstract

Abstract:

The heating performance of space heating heat pump (SHHP) with dual-cylinder rotary compressor was tested at low ambient temperature (T_od) in the range of -30—0℃, and water outlet temperature (T_wo) in the range of 41—50℃. The results show that ambient temperature has great influence on its discharge temperature and evaporating temperature, but little on condensing temperature; hot water outlet temperature has great influence on its condensing temperature, and little influence on its discharge temperature and evaporating temperature. With the decrease of ambient temperature, the heat capacity of SHHP decreases sharply, when T_wo = 41℃, T_od decreases from 0℃ to -30℃, and the heat capacity decreases by 62.16%. With the increase of outlet temperature, the heat capacity of SHHP decreases slowly, when T_od = 0℃, T_wo rises from 41℃ to 45℃, the heat capacity decreases by only 5.61%. The influence of ambient temperature on COP_h value is also obvious, when T_wo = 41℃, T_od decreases from 0℃ to -30℃, COP_h decreases from 2.94 to 1.38, a drop of 53.06%. The SHHP with dual-cylinder rotary compressor has good practical value to be applied in low temperature condition of -30—0℃.

Key words: low ambient temperature, space heating heat pump, heat transfer, compressor, phase change, coefficient of performance

摘要：

对双缸滚动转子式压缩机采暖热泵在环境温度（T_od）为-30～0℃，出水温度（T_wo）为41～50℃范围内的制热进行测试。研究表明：外界环境温度对排气温度、蒸发温度影响很大，对冷凝温度影响很小；热水出水温度对冷凝温度影响很大，对排气温度、蒸发温度影响很小。随着外界环境温度的降低，采暖热泵的制热量急剧下降，当T_wo=41℃时，T_od从0℃下降到-30℃，制热量的降幅达62.16%；随着出水温度的升高，采暖热泵的制热量下降缓慢，当T_od=0℃时，T_wo从41℃上升到45℃，制热量降幅仅为5.61%；外界环境温度对COP_h值的影响也显著，当T_wo=41℃时，T_od从0℃下降到-30℃，COP_h值从2.94下降到1.38，降幅达53.06%。双缸滚动转子式压缩机采暖热泵应用于-30～0℃的低温工况下，具有良好的实用价值。

关键词: 低环境温度, 采暖热泵, 传热, 压缩机, 相变, 性能系数

CLC Number:

TB 61⁺5

Yingde YIN, Dongsheng ZHU, Shijie LIU, Zhou YE, Feiyang WANG. Heating performance of space heating heat pump based on dual-cylinder rotary compressor in ultra-low temperature[J]. CIESC Journal, 2019, 70(S2): 220-227.

尹应德, 朱冬生, 刘世杰, 叶周, 王飞扬. 双缸滚动转子式压缩机采暖热泵低温制热性能[J]. 化工学报, 2019, 70(S2): 220-227.

Figures/Tables 10

Fig.1 Profile diagram of dual-cylinder rotary compressor1—exhaust tube；2—shell；3—stator；4—rotor；5—crank axle；6—cylinder 1；7—baffle；8—cylinder 2；9—suction tube；10—oil container

Fig.2 Schematic diagram of experimental setup

Table 1 Experiment conditions

Operating mode (heating)	Outdoor
Operating mode (heating)	T_db/℃	T_wb/℃
Case 1	0	-3
Case 2	-6	-8
Case 3	-12	-14
Case 4	-20	—
Case 5	-25	—
Case 6	-30	—

Table 2 Performance test of nominal working conditions

Operating mode

Outdoor

Heating water outlet

T_wo/℃

Fig.3 Variation of discharge temperature with outdoor temperature and water outlet temperature

Fig.4 Variation of evaporating temperature with outdoor temperature and water outlet temperature

Fig.5 Variation of condensing temperature with outdoor temperature and water outlet temperature

Fig.6 Variation of heating capacity with outdoor temperature and water outlet temperature

Fig.7 Variation of consumed power with outdoor temperature and water outlet temperature

Fig.8 Variation of COP with outdoor temperature and water outlet temperature

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