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The second refrigerant in commercial refrigeration (1)
author: supermarket refrigerated showcase category: commercial refrigeration Views: 572Time: 2016-08-22
The second refrigerant in commercial refrigeration
commercial refrigeration In the vapor compression or absorption refrigeration system, the evaporator is a cold output device, and the evaporator can be installed when used In a cold place, directly cool the object to be cooled. However, if the object to be cooled is far away from the evaporator, or it is not convenient to install the evaporator in a cold place, the refrigerant can be used to transfer the cooling capacity. The refrigerant first exchanges heat with the refrigerant in the evaporator to obtain cold capacity, and then uses a pump to transport the cooled refrigerant to various cold places to cool the object to be cooled. The advantages of using refrigerants are: the refrigeration system can be concentrated in the machine room or a small area, reducing the number of pipes and joints of the refrigeration system; facilitating system sealing and leak detection; reducing refrigerant charge; Capacity, the use of refrigerant in the centralized cooling device is convenient to solve the control and distribution of cold capacity; easy to install, the manufacturer can directly install the refrigerator, and the user only needs to install the refrigerant system on site.
1. Requirements for the properties of commercial refrigeration refrigerant
The refrigerant circulates between the evaporator and the cold place, and transmits the cold through sensible heat. The substance used as a refrigerant carrier should be kept in a liquid state at the required cold carrier temperature, no corrosion to the equipment, no harm to the human body, strong cold carrier capacity, and low transportation consumption.
commercial refrigeration refrigerant should have the following properties:
① non-toxic, non-flammable, no pungent odor. Good chemical stability, no decomposition, no oxidation, no change in physical and chemical properties under atmospheric pressure.
②It is liquid in the operating temperature range. Its freezing point should be lower than the evaporating temperature of the refrigerator, and its boiling point should be higher than the operating temperature.
③Small specific gravity, low viscosity, good heat transfer, large specific heat capacity. In this way, the flow resistance loss in the cooling system is small, the liquid circulation is small, the pump power consumption is small, and the size of the heat exchanger can be reduced.
2. Commonly used refrigerants. Commonly used refrigerants are water, aqueous inorganic salt solutions or organic liquids, which are suitable for different cooling temperatures.
(l) water
centralized commercial refrigeration air conditioning system, water is the most suitable refrigerant. The chiller in the computer room produces cold water of about 7℃ and sends it to the terminal cooling equipment in the building room for commercial refrigeration cooling. In addition, cold water can be sprayed directly into the air to achieve temperature and humidity adjustment. The freezing point of water is 0°C, which is only suitable for use when the cooling temperature is above 0°C.
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