The Flow Field And Temperature Field Simulation Analysis And Experimental Research Inside-60℃Low Temperature Frozen Cabinet

With the continuous development of cold chain logistics, at present, the market demand for cold storage plate which freezing point at-35℃is very big, the cold storage plate in the Working Capital of food circulation can be used to store refrigerated temperatures less demanding some food, and allow food to maintain a low temperature for a long time, extending its shelf life. The paper focuses on researching and developing BYF-400BCD type-60℃low temperature frozen cabinet, freezing-35℃cold storage agent rapidly, to meet the needs of cold chain logistics industry rapid development.The paper analyzes and summarizes the design principles and methods of low temperature quick-frozen cabinet, making thermodynamic calculation, model configuration and overall design for the main components of a refrigeration system equipment and accessories. Establishes the physical model of vertical low temperature quick-frozen cabinet, using the FLUENT software to simulate and calculate the flow field and temperature field inside cabinet. On the other hand, establishes a cold storage plate model, solves the cooling model of the freezing time and the temperature changes using MATLAB by programming. At the same time, using the ANSYS15.0simulates and solves the cold storage plate in the freezing process of internal temperature field distribution and ice advancing speedTest the performance of the vertical low temperature quick-frozen cabinet BYF-400BCD test prototype by experiments, the main experimental test work have:(1) Through testing out and inlet parameters such as temperature and wind speed of the low temperature quick-frozen cabinet, determines the boundary conditions in the numerical calculation;(2) Test the set point temperature and wind speed in low temperature quick-frozen cabinet under the condition of empty load, finding out the heat transfer performance negative points, then optimize and adjust the temperature field and flow field inside cabinet, so that the inside cabinet temperature field and flow field uniform distributed as soon as possible. The last measurement the temperature field and flow field under the condition of full load inside the cabinet whether meet the requirements.(3) Change outlet wind speed, place mode of cold storage plates, studying the cold storage plates frozen time and power consumption at different outlet wind speed and cold storage plates place mode.(4) Through horizontal comparisons and analysis with relevant cryogenic frozen cabinet, points out the necessity of60℃low temperature cabinet design.Through numerical simulation and experimental results, verifies the correctness of the model. The error of the simulation data and experimental data is that under the condition of empty load the temperature value maximum error of the point inside cabinet is12.4%, the speed value maximum error is13%; The error of the simulation data and experimental data is that under the condition of full load the temperature value maximum error of the point inside cabinet is11.5%, the speed value maximum error is15.3%. On the other hand, with the contrast of freezing time numerical results and experimental results of single piece of cold storage plate and analysis shows that the numerical calculation results is220min, the experiment results is190min, the error is15.78%between the two, in the whole process of cooling the surface temperature maximum error between experimental data and numerical solution is17.36%.The last, apply the orthogonal method to analyze and evaluate the experimental data, and confirm:BYF-400BCD type low temperature frozen cabinet supply air wind speed is1.8m/s, putting the cold storage plates with neatly placed vertically in the same floor and neatly stacked between the upper and lower levels is a manner reasonable design. The-35℃cold storage plates completely frozen take21.67h, power consumption is27.89KWh under these conditions.