What is the principle of the refrigerator What are the types of refrigerators 【Introduction】

What is the principle of the refrigerator What are the types of refrigerators 【Introduction】 You may feel strange when it comes to refrigerators. In fact, refrigerators are very common in our lives. A refrigerator is a machine that transfers the heat of a cooled object with a lower temperature to an environmental medium to obtain cooling capacity. The refrigerator is widely used in industry, agriculture and daily life. The following small series introduces the principles and types of refrigerators for everyone. Refrigerator ‍ The main performance indicators of refrigerators are working temperature (evaporation temperature and condensation temperature for vapor compression refrigerators, temperature of objects to be cooled and temperature of cooling medium for gas compression refrigerators and semiconductor refrigerators), cooling capacity ( The amount of heat removed from the cooled object per unit time of the refrigerator, power or heat consumption, refrigeration coefficient (a measure of the economic efficiency of a compression refrigerator, which refers to the amount of cooling available per unit of work consumed), and thermal coefficient (a measure of absorption The economic index of the type and steam jet refrigerator refers to the cooling capacity that can be obtained by consuming unit heat).   ‍    refrigerators can be divided into: compression refrigerators, absorption refrigerators, steam jet refrigerators, semiconductor refrigeration. Among them, vapor compression chillers (piston, rotary, screw, centrifugal), absorption chillers and steam jet chillers are widely used. At present, in addition to a few large-capacity and special-purpose refrigerators, general-purpose piston, centrifugal, screw, scroll, lithium bromide absorption, steam jet refrigerators, as well as freezing, cold storage, low temperature tests, etc. The equipment can be manufactured by itself. The main features of various types of refrigerators are as follows:    1. Compression refrigeration    1) Screw chiller: simple structure, less wearing parts, long service life, high single-stage compression ratio, and there is a tendency to replace the piston type in the range of large and medium-sized cooling capacity.    2) Piston refrigerator: The technology is relatively mature, high efficiency, wide use temperature range, can be made into large, medium and small products of various specifications, is the most widely used model of various refrigerators.    3) Centrifugal refrigerator: the impeller with high-speed rotation is used to obtain the kinetic energy of the refrigerant gas, and then the pressure is increased by the diffuser, cooled and liquefied, throttled and cooled. It has the characteristics of compact structure, large stand-alone cooling capacity and energy adjustment. R11 and R12 refrigerants are mostly used in air conditioners.    2. Absorption refrigeration   Using the absorption effect of the absorbent on the refrigerant to evaporate the refrigerant and cool it. Commonly used are ammonia-water absorption chillers and lithium bromide-water absorption chillers, which use a heat source as power, consume less power, operate smoothly, have fewer wearing parts, and have a large energy adjustment range. It is a new development. Variety of refrigerators.   Refrigerators are commonly used in industry and how do we make the refrigerator energy-saving? We must grasp two main points, one is to increase the evaporation temperature, and the other is to reduce the condensation temperature. Thus, the renovation of the cooling tower was increased to ensure the cooling water efficiency. In this way, high efficiency and energy saving can be achieved and the industry can save money. When we use the refrigerator, we must pay attention to regular repairs and maintenance, so as to extend its service life.

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