Study On The Technique Of Layout Of Vacuum Insulation Panels And The Heat Insulation Performance Of Marine Refrigerated Container Embedded With Vacuum Insulation Panels

Vacuum insulation panel has excellent heat insulation performance. Applying vacuum insulation panels to marine refrigerated container can improve the thermal insulation performance, reduce infiltration heat and the wall thickness, increase the effective volume, thus the capacity of refrigeration unit was reduced, and the initial investment and the operation power consumption were saved. Therefore, the technology upgrading of marine refrigerated container was realized, and the core competitiveness of Chinese marine refrigerated container industry can be improved. Restricted by production process, a whole piece of vacuum insulation panel can’t be made to apply to marine refrigerated containers. So the vacuum insulation panels on the refrigerated container can only splice together. This article studied the technique of layout of vacuum insulation panels from the following aspects.Firstly, the thermal conductivity of vacuum insulation panel and polyurethane foaming panel in 15, 20, 30 and 40 centigrade were calibrated respectively using Heat Flow Meter Method, and the heat insulation performance of the two kinds of materials were compared. Test results showed that the thermal conductivity of vacuum insulation panel was 0.00231 ~ 0.00239 W/(m ? K). The thermal conductivity of polyurethane foaming panel was 0.017 ~ 0.025 W /(m ? K) when the density was 50kg/m3. Compared with polyurethane foaming panel, vacuum insulation panel had a lower thermal conductivity, which was only about 10% of the polyurethane foaming panel’s.Secondly, the insulation mechanism and manufacturing technology of the pre-foaming sandwich-vacuum insulation panels were analyzed. According to the actual size of marine refrigerated container, simulation models of sidewall furnished with vacuum insulation panels were established for thermodynamic calculation. A prototype of sidewall with 9 vacuum insulation panels was made, and it’s average thermal conductivity was also measured. By comparing the results of simulation and experiment, the reasonable layout scheme was found. The results showed that the size of vacuum insulation panels in the pre-foaming sandwich-vacuum insulation panels should be as large as possible, which can reduce the thermal bridges produced by vacuum insulation panels. When applying vacuum insulation panels to marine refrigerated container, the vacuum insulation panels should not be applied in the places where there are jambs and stiffeners, to avoid connecting the thermal bridges.Finally, a detail layout scheme on marine refrigerated container of TONG LI TL-93 WCL was made. Finite element models of TONG LI TL-93 WCL furnished with vacuum insulation panels and marine refrigerated container with non vacuum insulation panels were established respectively for thermodynamic calculation. Compared with conventional refrigerated container, the thermal insulation performance of the marine refrigerated container furnished with vacuum insulation panels was assessed. Simulation and experimental research showed that using vacuum insulation panels can significantly improve the insulation performance of marine refrigerated containers. When the marine refrigerated container was furnished with vacuum insulation panels of 10 mm thick, layout area accounts for 83.9% of the total area, the heat leakage was reduced by 30.6%, the thermal insulation performance was obviously improved. Thus, smaller refrigeration unit can be used to reduce the initial investment and the operation power consumption of the refrigerated container.