PERFORMANCE ANALYSIS OF EVACUATED TUBE DIRECT-EXPANSION SOLAR-ASSISTED HEAT PUMP SYSTEMS

被引：0
|
作者：
Yu X. [1 ]
Wang T. [1 ]
Gao Z. [1 ]
机构：
[1] School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin
来源：
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2023年 / 44卷 / 11期
关键词：
coefficient of performance; direct-expansion; evacuated tube; heat pump systems; solar collectors; variable frequency;
D O I：
10.19912/j.0254-0096.tynxb.2022-1125
中图分类号：
学科分类号：
摘要：
Based on the annular vacuum of vacuum tube collector can suppress the convective heat loss around the heat absorber，which can achieve higher collector temperature and collector efficiency compared with traditiona flat plate collector，this paper proposed an evacuated tube type direct-expansion solar-assisted heat pump，which combines evacuated tube collector with direct expansion solar heat pump. This paper experimentally investigates the effects of solar radiation intensity and circulating water temperature on system performance under typical operating conditions，and explores the dynamic performance of the system under the condition of compressor frequency conversion. The results show that increasing solar radiation intensity and decreasing circulating water temperature are beneficial to improve the system performance. The system achieves the maximum COP of 5.36 at the radiation intensity of 850 W/m2 and circulating water temperature of 55 ℃. The COP of the system with the compressor frequency of 42 Hz is 4.08，which is 1.23%，8.5% and 13.6% higher than that of 45，47 and 50 Hz，respectively. © 2023 Science Press. All rights reserved.
引用
收藏
页码：166 / 173
页数：7
相关论文
共 18 条
  • [1] FAN Y, HAN Z H，, Et al., Scientific and technological progress and future perspectives of the solar assisted heat pump（SAHP）system［J］, Energy, 229, (2021)
  • [2] CHATURVEDI S K, SHEN J Y., Thermal performance of a direct expansion solar-assisted heat pump［J］, Solar energy, 33, 2, pp. 155-162, (1984)
  • [3] WANG Z C，, LI X F，, Et al., Structural optimization of collector/evaporator of direct- expansion solar/air- assisted heat pump［J］, Alexandria engineering journal, 60, 1, pp. 387-392, (2021)
  • [4] MOHAMED E，, RIFFAT S，, OMER S，, Et al., A comprehensive investigation of using mutual air and water heating in multi-functional DX-SAMHP for moderate cold climate［J］, Renewable energy, 130, pp. 582-600, (2019)
  • [5] KONG X Q，, YANG Y M，, ZHANG M Y，, Et al., Experimental investigation on a direct- expansion solar-assisted heat pump water heater using R290 with micro-channel heat transfer technology during the winter period ［J］, International journal of refrigeration, 113, pp. 38-48, (2020)
  • [6] SONG Z Y, CAI J Y，, Et al., Investigation on a direct-expansion solar- assisted heat pump with a novel hybrid compound parabolic concentrator/photovoltaic/fin evaporator ［J］, Applied energy, 299, (2021)
  • [7] Experiment and simulation study on convective heat transfer of all- glass evacuated tube solar collector［J］, Renewable energy, 152, pp. 1129-1139, (2020)
  • [8] Experimental study of a direct expansion solar- assisted heat pump（DX- SAHP）with finned- tube evaporator and comparison with conventional DX-SAHP［J］, Energy and buildings, 207, (2020)
  • [9] CHATURVEDI S K, CHEN D T，, KHEIREDDINE A., Thermal performance of a variable capacity direct expansion solar-assisted heat pump［J］, Energy conversion and management, 39, 3-4, pp. 181-191, (1998)
  • [10] SUN P L，, LI Y，, Et al., Experimental studies of a variable capacity direct-expansion solar-assisted heat pump water heater in autumn and winter conditions［J］, Solar energy, 170, pp. 352-357, (2018)
12