2.1 Unit structure The unit consists of five systems: refrigeration system, cooling water system, air duct system, evaporator end
and electric air system. 2.1.1 Refrigeration system The refrigeration system of the ultra-low temperature quick freezer is
composed of a high temperature level refrigeration system and a low temperature level refrigeration system. The heat exchange tube
Using high-efficiency tubes, the heat exchange capacity is better. The condenser has compact structure, small footprint and high
heat transfer coefficient. Detachable structure for easy maintenance and cleaning. The evaporator adopts the copper tube aluminum
fin evaporator designed by the company (or aluminum plate), high-efficiency copper tube is used, and the heat exchange effect is
good. Expansion valve, filter drier, sight glass, Expansion tank, regenerator and other accessories, all adopt Internationally
renowned brand products can ensure the efficient and reliable operation of the system. 2.1.2 Electrical system The unit adopts
programmable controller to automatically complete the operation and protection functions of the unit. Our company's unit selection
The programmable controller has the advantages of small size, light weight, high reliability, large storage capacity and many
control points. Coupled with the unique analog input expansion module of the controller, the control accuracy of the system is
greatly improved. According to According to user requirements, the programmable controller can be equipped with a dedicated
communication interface, so as to realize the remote control and centralized real-time control of the unit. control, so that the
unit can flexibly cooperate with the building automatic control system to realize multi-directional automatic intelligent control.
2.1.3 Cooling water system The water system consists of condenser, cooling tower, circulating water pump, stop valve, check valve,
filter and pipeline.