Study On Analysis Of Energy Consumption And Optimization Of Refrigerated Transportation Equipment

With the influence of global warming and energy crisis, the energy conservation of cold chain, especially refrigerated transportation, is more and more important. Now, the problem of quality and safety of perishable food and energy conservation are the key topic in the development of refrigerated transportation. The entire analysis of energy consumption of refrigerated transportation is the solution of these questions. Based on investigation, statistics, simulation and experimentation, the mechanism of energy consumption and measure of energy conservation were obtained in this dissertation. Then, optimal design of refrigerated transportation unit has been done.·The status and energy investigation of refrigerated transportationThe status of refrigerated transportation was investigated all over the world by document retrieval, conference, discussion, survey, questionnaire, etc. The equipment development, management status and energy consumption of railway refrigerated transportation were emphasized.It showed that the sale and output of perishable food was increased rapidly all over the world. In our country, the energy consumption was large and the quality of perishable food was not good because of old refrigerated transportation equipment and incomplete cold chain. The solution of the question is mending management system, improving technology and operation, optimizing transportation equipment, especially holding the mechanism of energy consumption of refrigerated transportation.·The analysis of energy consumption of refrigerated transportationAn analytic system was set up to simulate the heat condition and energy consumption of refrigerated transportation. In this system, heat balance model (HBM) was chosen as the analyzed tool. It includes climate model outdoors, heat balance model of insulated layer (heat transfer model of the insulated layer, exterior and interior surface heat balance model of insulated layer), heat balance model of the air in the vehicle, etc. In this dissertation, a special climate model of refrigerated transportation was established, exterior surface heat balance model of insulated layer was completed, the response factor method was introduced in the unsteady heat transfer of refrigerated transportation, and the mechanism of air infiltration was studied. The model properly reflects the dynamic pattern of energy consumption of refrigerated transportation and provides a basis for holistic evaluation and optimum controlling on energy conservation. It was validated by ANSI/ASHRAE Standard 140-2004. At the same time, a simulating test-bed of refrigerated transportation condition was designed. Based on the model and test-bed, the parameters such as the category of perishable food, season, the climate outside the door, velocity, respiration heat, air tightness, heat leak performance, precooling, control strategy, etc were analyzed by this model linking to energy consumption of refrigerated transportation. The measures of energy conservation were advised.·The optimal design of refrigerated transportation unitBased on investigated, simulation and experimentation, the optimal design has been done on the refrigerated transportation unit. The airflow distribution of B₁₀ type railway refrigerated car has been ameliorated. Furthermore, the application of energy conservation technology such as air curtain, foaming technology, air supply pattern, new refrigeration, air-air exchanger, etc were discussed.