Journal of Shandong University(Engineering Science) ›› 2019, Vol. 49 ›› Issue (5): 58-63.doi: 10.6040/j.issn.1672-3961.0.2019.155

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

Performance analysis for an absorption refrigeration system driven by parabolic trough solar collector

Tongtong WANG1(),Jianan SUN1,Tao ZHANG2,Zeting YU1,*(),Jiqiang YIN1   

  1. 1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
    2. Shandong Electric Power Engineering Consulting Institute Co., Ltd, Jinan 250013, Shandong, China
  • Received:2019-04-11 Online:2019-10-20 Published:2019-10-18
  • Contact: Zeting YU E-mail:201744126@mail.sdu.edu.cn;yuzt@sdu.edu.cn
  • Supported by:
    国家自然科学基金资助项目(61733010);山东省自然科学基金资助项目(ZR2019MEE045)

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Abstract:

In order to make rational use of solar energy, enhance the seasonal adaptability of the refrigeration system, a medium temperature solar driven ammonia water absorption refrigeration system was proposed. Based on the parabolic trough solar collector (PTSC) driven ammonia single-effect absorption refrigeration system, according to the laws of thermodynamics and the energy balance equation, under the engineering equation solver (ESS), the solar collector model and the refrigeration system model were established respectively, and the key parameters of the system were calculated. The effects of system high pressure, system low pressure, evaporator outlet temperature and rectifier outlet mass fraction on the system were analyzed from three aspects: refrigeration capacity, rectification heat and coefficient of performance (COP). The results showed that the cooling capacity decreased with the increase of the system low pressure; the rectification heat and COP increased with the increasing of the system low pressure; when the outlet temperature of the evaporator rised, the cooling capacity and COP increased; when the rectifier mass fraction increased from 0.977 to 0.999, the COP showed a maximum when the ammonia mass fraction was 0.992. The results provided a theoretical basis for the feasibility of the single-stage absorption refrigeration cycle driven by solar energy.

Key words: solar energy, parabolic trough solar collector, ammonia-water, refrigeration system, COP

CLC Number: 

  • TM911

Fig.1

Schematic diagram of PTSC-driven ammonia absorptionrefrigeration system"

Table 1

System input parameters"

环境温度/℃ 环境压力/MPa IAM PTSC开口宽度/m PTSC长度/m 工质流速/(kg·h-1) 单个集热器模块面积/m2 集热器模块数量/个 吸收器出口温度/℃ 泵等熵效率/%
20 0.1 0.93 2.3 22.54 1 200 30 4 40.1 80

Table 2

Solar collector calculation results"

集热管出口温度/K 槽式聚光镜吸收的太阳能/(W·m-1) 集热管能量损失/(W·m-1) 集热器模块间压降/kPa 太阳能集热器效率/% 支架能量损失/kW 玻璃管能量损失/kW
369.84 1 040 117.9 0.567 42.43 43.029 20.81

Table 3

Calculation results of points in the refrigeration cycle"

状态点 压力/MPa 温度/K ω(氨)/% 焓/(kJ·kg-1) 熵/(kJ·K-1)
1 0.288 313.1 0.397 50.0 0.461
2 1.555 313.2 0.397 48.8 0.460
3 1.555 397.2 0.297 358.0 1.562
4 0.280 350.0 0.297 358.0 1.617
5 1.555 374.9 0.958 1516.0 4.811
6 1.555 374.9 0.397 229.4 1.270
7 1.555 317.6 0.999 129 8 4.184
8 1.555 313.1 0.999 190.4 0.658
9 0.288 262.9 0.999 190.4 0.735
10 0.288 278.1 0.999 1293.0 4.907

Fig.2

Effect of system low voltage on refrigeration system"

Fig.3

Effect of system high pressure on refrigeration system"

Fig.4

Effect of evaporator outlet temperature onrefrigeration system"

Fig.5

Effect of rectifier outlet concentration onrefrigeration system"

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