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山东大学学报 (工学版) ›› 2019, Vol. 49 ›› Issue (5): 85-90.doi: 10.6040/j.issn.1672-3961.0.2019.145

• 能源与动力工程——制冷技术专题 • 上一篇    下一篇

辐射强度对直膨式太阳能热泵系统性能的影响

张茂远(),孔祥强*(),杨义孟,刘晓东   

  1. 山东科技大学机械电子工程学院, 山东 青岛 266590
  • 收稿日期:2019-04-08 出版日期:2019-10-20 发布日期:2019-10-18
  • 通讯作者: 孔祥强 E-mail:626991224@qq.com;kxqiangly@126.com
  • 作者简介:张茂远(1995—)，男，山东济南人，硕士研究生，研究方向为制冷空调与热泵技术. E-mail:626991224@qq.com
  • 基金资助:
    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)

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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摘要：

为分析太阳辐射对直膨式太阳能热泵系统性能的影响,研究了变频控制的R134a直膨式太阳能热泵热水器系统。对典型冬季试验中不同太阳辐射强度下的系统性能和关键参数进行讨论。试验结果表明,吸气过热度和系统COP(coefficient of performance)值都随太阳辐射强度的增加有不同程度的增加,压缩机平均排气温度则略有下降。在相似的环境温度下,当辐射由233 W·m-2增至631 W·m-2时,系统COP由3.39增至4.31,相对增加了28.9%。同时,集热器集热效率与太阳辐射强度呈现负相关的关系,太阳辐射越强,集热器集热效率越低。当有效集热面积为2.10 m2,太阳辐射强度由233 W·m-2增加到631 W·m-2时,集热效率由2.17减小到0.9,降低了58.5%。

关键词: 热泵, 太阳辐射强度, 过热度, 变频

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

中图分类号: 

  • TK11

表1

测量仪器的规格与精度"

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

图1

直膨式太阳能热泵热水器系统原理图"

表2

冬季试验数据表"

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

图2

冬季太阳辐射强度与环境温度的日变化曲线"

图3

辐射强度对排气温度和过热度的影响"

图4

太阳辐射强度对系统COP值的影响"

图5

太阳辐射强度对集热器集热效率的影响"

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