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24
2019-07
Do you know the characteristics of these common refrigerants?
R717 (Ammonia) R717 Ammonia: Ammonia is currently the most widely used medium pressure refrigerant. The solidification temperature of ammonia is -77.7 ℃, the standard evaporation temperature is -33.3 ℃, and the condensation pressure is generally 1.1~1.3MPa at normal temperature, even when the cooling water temperature is as high as 30 ℃ in summer, it does not exceed 1.5MPa. Mainly used in large-scale industrial refrigeration and commercial refrigeration field. ◆ Easy to obtain, low price, moderate pressure, large unit cooling capacity, high heat release coefficient, almost insoluble in oil, small flow resistance, easy to find when leaking. But there is a pungent odor, toxic
2019-07-24
24
2019-07
Introduction of cold storage construction design considerations
1. The size of the cold storage volume of the cold storage should be calculated according to the volume that the storage products must occupy in the cold storage, plus the inter-row aisle, the space between the pile and the wall and the ceiling, and the gap between the packaging room. After determining the capacity, determine the length and height of the cold storage. Cold storage design should also consider the necessary ancillary buildings and facilities, such as workshop, packaging and finishing room, tool warehouse and loading and unloading station, so that the quality of cold storage can be guaranteed. 2, the choice of heat insulation material is very important to the quality of cold storage, cold storage insulation material selection must be adapted to local conditions, not only to have good heat insulation performance, but also economical and practical. Insulation material is divided into several
2019-07-24