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An Experimental Study on Low-temperature Cool Storage Systems and Characteristics of Cool Charge and Discharge

Author: WuBiRong
Tutor: TongMingWei
School: Chongqing University
Course: Refrigeration and Cryogenic Engineering
Keywords: Eutectic salt Regenerator material Cryogenic storage Ice coil Heat transfer coefficient
CLC: TB66
Type: Master's thesis
Year: 2004
Downloads: 219
Quote: 2
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Abstract


Development of storage technology is to achieve grid \The current storage technology is mainly used in building air-conditioning, along with the development of technology, is expected to expand its scope of application, research and development of low-temperature storage technology has great theoretical and practical significance. Some of this eutectic salt system for the screening experiments, found a phase transition temperature of -10.7 ℃ eutectic salt storage material having a phase change stable, latent heat of fusion is large, no phase separation, etc., are expected to In the beer refrigeration station, some chemical production and refrigerated areas in the applications. Established a horizontal coil inside the melting ice cool storage bench, in this experimental setup was carried out above the eutectic salt storage materials storage and let cool features of experiments, the main research contained refrigerant inlet temperature and flow rate affect it the experimental phenomena and results are analyzed; and phase change interface movement law, put cold storage process heat transfer characteristics are analyzed theoretically. The results showed that: (1) the carrier into the storage tank refrigerant inlet temperature for storage and put cold process while the effect of load on the storage and flow of refrigerant to cool the process less affected. Through the storage process analysis is contained refrigerant inlet temperature of -17.5 ℃, flow rate of 1.23m 3 / h when more appropriate. (2) the process of storage and put cold side and the disc contained refrigerant heat transfer resistance of the tube wall outer thermal resistance compared to the much smaller heat storage material, so the focus is to enhance the heat transfer enhancement coil outside the regenerator material with coil heat transfer coefficient. (3) for the storage and put cold heat transfer process analysis, the experimentally measured tube outer heat transfer coefficient and thermal conductivity by concentric assumptions are based on principles of the calculated values ??are compared. The results show that the heat transfer enhancement of natural convection, which is particularly evident during cool. (4) for the storage of ice during the freezing process before lap concentric cylinder model was established using the resistance method to solve the model, the movement of solid-liquid interface has been studied. (5) for the entire storage process was analyzed, and the storage capacity to be under the experimental conditions suitable relational: Q / Q max = 0.043Fo 0.7401 Ste 0.5595 Re 0.3366 , 0 lt; Fo lt; 40,0.01 lt; Ste lt; 0.06,100 lt; Re lt; 400. (6) to cool the entire process was analyzed, the amount to be released and out of the cold under the experimental conditions suitable relational: Q / Q max = 0.1403Fo 0.6728 Ste 0.6565 Re 0.151 , 0 lt; Fo lt; 50,0.07 lt; Ste lt; 0.15,200 lt; Re lt; 800.

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