Researches On Simulation Of Characteristics Of Small-scale Cold Storage

Based on the theory of thermodynamic of refrigeration system, i.e., the viewpoint of dynamic, distributed parameters and parameters quantitatively coupled, and with the application of microelement method, this thesis is contains a theoretical and experimental research on the structural characteristics and performance of small-scale cold storage. Main contents of this thesis are as what follows:First, the key component sub-models for a small-scale cold storage are developed. Concentrative parameter model and non-homogeneous model of dynamic distribution parameter are respectively adopted in the compressor and the heat exchangers. A dynamic concentrative parameter model is adopted in the thermostatic expansion valve On the basis of the analysis of the characteristics of enclosure structure, the dynamic mathematics model is established through the simplification of boundary condition.Second, on the basis of the above study, the coupled relationship among parameters of every part of refrigeration system and air convection cool system of small-scale cold storage is deeply analyzed and some appropriate numerical techniques are put forward for dynamic simulation. A dynamic simulation model of the small-scale cold storage refrigeration installation is established and calculated. Calculation results fit experimental data well.At last, in order to further discover the matching between the two systems of small-scale cold storage, PHOENICS-CFD general software is applied in the study on 3-D distributions of the airflow and temperature fields in the chamber of the small-scale cold storage. Buoyancy model in the simulation are considered and the results are in agreement with the experimental data. Then the 3-D airflow and temperature fields are calculated respectively in different positions of evaporator. A comparison of different calculation results shows that the difference between evaporator positions much influents the 3-D distributions of the airflow and temperature fields.The above theoretical and experimental researches offer a theoretical basis for dynamic simulation and optimization of small-scale cold storage.