Numerical Simulation On Heat Transfer Performance Of Spherical Encapsulated Cold Storages

With the progress of humanity civilization and the speedy development of industry modernization, the use of air conditioning technology has become increasingly popular. The cold storage technology of air conditioning has become an important measure used to adjust loads and save electricity as the result of transforming a part of high loads in the day to low loads in the night. The solid-liquid phase change is an important research subject of the engineering thermal physics and main foundation of evaluating the cold storage containers, so to have a deep research is benefit to strengthen the heat transfer of that and to have an important theory meaning.Based of that, the main research contents as follows:1. The approximate analytical solution of melting process within a spherical enclosure is to presented by contacting heat transfer.A numerical model describing the melting process is presented by considering the difference of the solid-liquid density and natural convection. From which we can get the variation of the melt-film thickness, melting rate and heat transferred. These computing results are more reasonable than those literature from the comparison.2. Under certain appropriate assumptions, a mathematical model of water undergoing solidification in the spherical enclosure is established .The perturbation technique is employed to solve this problem. The correlation of the entire solidification time under the third boundary condition.3 . A mathematical model that concerns melting and solidification of the ice storage tank with encapsulated ice is presented .A computer program is developed to solve the model.4. The experimental apparatus has been designed and constructed. By theexperimental investigation of packed capsules with solidification and melting,we get experimental data. By incorporating the experimental results and theorypredictions, the good agreements are gotten.