The general principle of design and layout of display cooler refrigeration system

1. The determination of the type of refrigerant mainly decides whether to use ammonia (R717) or Freon. Generally speaking, if it is a large-tonnage, large-bay display cooler for aquatic products and low-temperature meat display cooler, and the control accuracy is not high, you can use the ammonia display cooler. If it is a display cooler with a small bay and high control precision (for example, if the vegetable display cooler), the fluorine machine display cooler has an irresistible advantage.

2. The determination of the compressor type is mainly to determine whether the compressor is screw type or piston type, and the compressor is semi-closed or fully closed.

3. Determining the number of compressor stages is to determine whether to use single-stage or double-stage. The criterion for determining the selection of single and dual-stage compressors is the compression ratio P~/Po. For ammonia systems, pk/Po≤ single-stage at 8 and dual-stage at pk/po>8. For halogenated hydrocarbon systems, pk/po≤ single-stage at 10, and dual-stage at lpo>10. The two-stage compressor used can be a single two-stage compressor, or a matched two-stage compressor.

4. Determination of the liquid supply mode of the refrigeration system The liquid supply mode of the refrigeration system is divided into direct liquid supply, gravity liquid supply, liquid pump liquid supply and air pump liquid supply. DC liquid supply is suitable for small ammonia display cooler refrigeration devices, systems with stable load, and fluorine refrigeration devices. Gravity liquid supply is suitable for medium and small ammonia display cooler refrigeration devices. In the brine ice refrigeration system, because the ammonia separator can be located near the ice making pool, there is no need to build an additional attic to place the ammonia separator: at the same time, the brine evaporator has a large heat load and intense heat exchange, which can be achieved by natural convection. Get better heat exchange effect. Therefore, the salt water ice making is still dominated by gravity. Liquid pump supply is much superior to direct liquid supply and gravity liquid supply. It has been widely used in domestic and foreign refrigeration devices and is the most widely used liquid supply method for large and medium-sized display cooler refrigeration devices in China. Air pump liquid supply has its unique characteristics, and there have been successful application examples at home and abroad. However, in view of its higher requirements for automatic control components and other reasons, there are not many applications in China.

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