| 摘要 |
PROBLEM TO BE SOLVED: To supply fresh air into a freezing warehouse while preventing refrigeration efficiency from lowering. SOLUTION: Outer air is sucked by means of a booster 3 through an air filter 5 and a total heat exchanger 4 and fed through a first air cooler 6 to a compressor 7 thence fed through a second air cooler 9 and a heat recovery heat exchanger 10 to a turbine 8 coupled with a compressor 7. The outer air is expanded in the turbine 8 to have a freezing temperature and then fed into a freezing warehouse 1 through a snow removing machine 11. Air in the freezing warehouse 1 is used as a cold heat source for the heat recovery heat exchanger 10 and discharged through the total heat exchanger 4. Since air in the warehouse is discharged while cooling the warehouse by taking in the outer air, the warehouse can be filled with fresh air even if an article generating odor is stocked and the odor is prevented from transferring to other article. Furthermore, the total heat exchanger can prevent freezing efficiency from lowering when wet air is introduced into the warehouse.
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