Journal of Shandong University(Engineering Science) ›› 2019, Vol. 49 ›› Issue (5): 85-90.doi: 10.6040/j.issn.1672-3961.0.2019.145

• Energy and Power Engineering—Special Topic on Refrigeration Technology • Previous Articles     Next Articles

Influence of performance of direct-expansion solar-assisted heat pump system at different solar radiation intensity

Maoyuan ZHANG(),Xiangqiang KONG*(),Yimeng YANG,Xiaodong LIU   

  1. College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
  • Received:2019-04-08 Online:2019-10-20 Published:2019-10-18
  • Contact: Xiangqiang KONG E-mail:626991224@qq.com;kxqiangly@126.com
  • Supported by:
    国家自然科学基金资助项目(51776115);山东省研究生导师指导能力提升项目(SDYY17037);山东科技大学研究生导师指导能力提升计划项目(KDYC17009)

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Abstract:

To analyze the effect of solar radiation intensity on direct-expansion solar-assisted heat pump system (DX-SAHP), a direct-expansion solar-assisted heat pump water heater (DX-SAHPWH) system using variable frequency control and R134a was introduced and studied in this research. By carrying out the experiments under typical winter meteorologic conditions, the system performance and critical parameters were discussed. It revealed that the increasing solar radiation intensity made a higher superheat degree and coefficient of performance (COP), while the discharge temperature decreased with it. At similar ambient temperature, when the solar radiation intensity increased from 233 W·m-2 to 631 W·m-2, the system COP varied from 3.39 to 4.31, increased by 28.9%. Meanwhile, the solar radiation intensity had an opposite effect on the solar efficiency, which meant the higher solar radiation intensity was, the smaller collector efficiency was. Based on collector area of 2.10 m2, the solar collector efficiency decreased from 2.17 to 0.9 with the rising solar radiation intensity from 233 W·m-2 to 631 W·m-2, decreased by 58.5%.

Key words: heat pump, solar radiation intensity, superheat degree, variable frequency

CLC Number: 

  • TK11

Table 1

Specification and accuracy of measuring instruments"

传感器类型 测量参数 范围 精度
PT100铂电阻温度计 温度 -50~150 ℃ ±0.5 ℃
CYYZ11压力传感器 压力 -0.1~5 MPa 0.25%FS
TBQ-2总辐射表 太阳辐射 0~2 000 Wm-2 8.145 μV·(W·m-2) -1
TED系列功率表 电功率 220 V, 5 A 0.5%FS
FS01三杯式风速仪 环境风速 0~30 m·s-1 ±0.2 m·s -1
HSTL湿度传感器 环境湿度 0~100% 3% RH

Fig.1

Schematic diagram of a DX-SAHPWH system"

Table 2

Experimental data under winter conditions"

试验日期 天气状况 加热时间/min 环温/℃ 辐射/(W·m-2) 排气温度/℃ 过热度/℃ COP η
2017-12-27 阴 480 7.90 233 68.75 9.69 3.39 2.17
2017-11-30 晴 450 7.60 455 63.74 8.07 4.05 1.51
2018-01-13 晴 440 7.18 631 66.22 15.46 4.37 0.92

Fig.2

Variations of solar radiation intensity and ambient temperature in test days"

Fig.3

Effect of solar radiation intensity on discharge temperature and superheat degree"

Fig.4

Effect of solar radiation intensity on system COP"

Fig.5

Effect of solar radiation intensity on solar collector efficiency"

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