Analysis of cooling performance and energy consumption of nocturnal radiation and natural ventilation combined mechanical refrigeration system for outdoor prefabricated substation

Yang, Haiying; Hu, Zicheng; Ge, Fenghua; Liu, Xiaoyuan

doi:10.1016/j.applthermaleng.2023.120650

Cited by 1 publication

(2 citation statements)

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“…Since RC does not provide stable temperature maintenance, in recent works, it was used in conjunction with refrigeration machines [15]. However, when combining different cooling methods, it is necessary to determine the criteria by which one cooling method is switched to another.…”

Section: Introductionmentioning

confidence: 99%

“…This work is a continuation of [16] and is necessary for the development of a refrigeration system for fruit storage. A review of the literature [5][6][7][8][9][10][11][12][13][14][15][16] showed that the study of RC heat transfer processes in winter is based on theoretical models, the correctness of which is confirmed only for the warm period of the year. In winter, however, there is a possibility that the process of ice formation on the surface of the radiator, an increased level of cloudiness and dust content in the air can have a significant impact on RC.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of the Heat Flow and Energy Consumption during Liquid Cooling Due to Radiative Heat Transfer in Winter

Tsoy,

Granovskiy,

Koretskiy

et al. 2023

Energies

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Radiation cooling is a passive energy saving cooling technology. The process of cooling heat transfer liquid due to the combined effect of night radiative cooling and convection of air at negative temperatures (in winter) is studied. The radiator used for cooling was built into the roof of the building. Its radiating plate was made of a steel sheet coated with zinc oxide. In it, heat dissipation was carried out both from the upper and lower sides of the radiating plate. The experimental values of the heat flux ranged from 20 to 80 W·m−2 at a temperature difference between heat transfer liquid and air from 5 to 15 °C and ambient air temperature from −17 to +5 °C. The correctness of the model for calculating the heat flux in winter conditions was confirmed. A theoretical calculation showed that, in winter, the heat flux removed by the radiator will be 15% less than the heat flux in summer. The amount of heat transferred per watt of electrical power of the refrigeration unit reached 8 W·W−1. To keep the refrigeration unit with radiative heat transfer more efficient than in a conventional vapor compression chiller, the heat transfer liquid temperature should be 6 °C above the atmospheric temperature air. The results of the study show that radiative cooling can be used in winter and may be useful for the development of energy-efficient cooling systems for various purposes (air conditioning, industrial cooling systems and fruit storage chambers).

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Section: Introductionmentioning

confidence: 99%