CN; mso-bidi-language: AR-SA">Â Refrigeration equipment is a combination of a chiller and a facility that uses cold capacity. Refrigeration units are designed and constructed to efficiently use cold quantities to refrigerate food or other items; to perform product performance tests and scientific research tests at low temperatures; to achieve certain cooling processes in industrial production, or to perform air conditioning.
When the item is cooled or frozen, a certain amount of heat is released, and the enclosure of the refrigeration unit also introduces a certain amount of heat when it is used. Therefore, in order to maintain the low temperature conditions in the refrigeration unit, it is necessary to install a refrigerator to continuously remove the heat, or to absorb the heat by melting the ice or sublimation of the dry ice.
Before the development of artificial refrigeration began, humans have known to use natural ice and snow to maintain low temperature conditions in simple equipment, that is, to use natural cold sources. In China, natural ice preserved food was used about 3,000 years ago. In the 7th century BC, the Book of Songs contains poems about collecting, storing and using natural ice-refrigerated food. Until modern times, natural sources of ice, snow and groundwater were still being used.
Refrigerators cooled with natural ice or artificial ice can only achieve limited low temperatures, poor technical conditions and sanitary conditions, and it is difficult to meet various requirements. Modern refrigeration units use a chiller to cool.
There are two types of cooling methods for direct cooling and indirect cooling. Direct cooling is to install the evaporator of the refrigerator in the cabinet or building of the refrigeration device, directly cool the air by evaporation of the refrigerant, and cool the object to be cooled by the cold air. The advantage of this cooling method is that the cooling rate is fast, the heat transfer temperature difference is small, and the system is relatively simple, so it is widely used.
Indirect cooling relies on the evaporation of refrigerant in the evaporator of the refrigerator to cool the brine ( such as brine ) , and then the refrigerant is introduced into the cabinet or building of the refrigeration unit, and the air is cooled by the heat exchanger. This cooling method has a slow cooling rate, a large total heat transfer temperature difference, and a complicated system, so it is only used in a small number of occasions, such as brine ice making and cold storage with constant temperature requirements.
According to the cooling purpose and the cooling utilization mode, the refrigeration device can be roughly classified into four types: a refrigeration refrigeration device, a test refrigeration device, a production refrigeration device, and an air conditioning refrigeration device.
Refrigeration refrigeration equipment is mainly used to store or transport food and other goods under low temperature conditions, including various refrigerators, cold storage, refrigerated trucks, refrigerated boats and refrigerated containers.
The refrigerator, also known as the freezer, is a small, integrated refrigerating device that is usually formed of a metal structure that integrates the refrigerator with the refrigerator. The refrigerator can be divided into household refrigerators, medical refrigerators, store refrigerators ( cold counters, cold kitchen windows, etc. ) and kitchen refrigerators according to the use, among which household refrigerators are used. Household refrigerators are generally established, and are available in single and double doors. The box body is composed of a metal shell and a plastic inner tank, and a polyurethane foam is cast between them to ensure heat insulation. A magnetic seal is placed around the door of the door, which acts as a suction and seal when closed.
Household refrigerators are mostly cooled by a compression chiller, with Freon as a refrigerant. The evaporator is installed in the upper part of the refrigerating compartment, wherein the evaporation of the refrigerant directly cools the air in the tank to form a low temperature zone, and the temperature can reach -12 ～
The freon vapor evaporated in the evaporator is increased by the compressor compression pressure, then condensed into a liquid in the condenser, and then depressurized by capillary throttling, and then returned to the evaporator to continue to evaporate and cool. Some domestic refrigerators also use absorption diffuser refrigerators, called absorption refrigerators. There is also a semiconductor refrigerator using a semiconductor refrigerator, but it consumes a large amount of power and is rarely used.
The test refrigeration device mainly uses a refrigeration method to simulate a natural environment or a low temperature condition in a production process in order to perform performance tests or scientific research tests on products and materials. The test refrigeration device is roughly classified into three types according to the test object and requirements: low temperature test, climate test and high altitude test.
The cryogenic test device is only required to keep the temperature low (
The production refrigeration devices mainly include ice making devices, dry ice devices, devices for producing ice cream and cold drinking water, and other devices for industrial production processes. The air conditioning refrigeration device is mainly used for an air conditioning device and a dehumidifier for maintaining a constant temperature and humidity of the indoor air.
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