Ventilation Model Experiment Of Reefer Container Ship Cargo Hold

Now ship owners would rather carry reefer containers with air-cooled condensers than carry water-cooled reefer containers, and then the designing for cargo hold ventilations of container ships will be more difficult than before. With the developments of the computer technique and numerical simulation, analyses and optimize the air flow in the container ships'cargo holds by CFD software becomes an economical and high efficient method. AIRPAK is used in the study of the ventilation design for No.5 cargo hold of the target ship and the reliability is proved by experiments. The results are as follows in this paper:1. An similar experiment model of No.5 cargo hold was designed and established based on the similarity theories. Analyses the air flow in the cargo hold under different ventilation conditions (mechanical supply, mechanical exhaust, variable heat emission from condensers, etc.) and compare the numerical simulation results and experiment results. The distributions of the temperature in computer model and experiment model are similar and this shows that the numerical simulation of cargo hold ventilation is reliable.2. An experiment model of the partial No.5 cargo hold towards single reefer container with scale of 1:1 was established. The distribution of the air flow under different mechanical supply air volumes and different condensing heat was investigated. It shows that the distribution of temperature and velocity is greatly influenced by positions of the model supply air outlet and the air inlet / outlet of the condensing unit of the reefer container.3. A computer model of the 1:1 experiment model was established by AIRPAK. The numerical boundary settings are same as those of numerical simulation for whole No.5 cargo hold, and the result of CFD simulation matches actual example in general. Combined with the similar model experiment and its numerical simulation, the mathematic model selections, boundary settings and soft setups in the CFD software (AIRPAK) are reasonable, and the numerical simulation results are acceptable. Technical foundation is prepared for optimizing cargo hold ventilation by AIRPAK in later design.