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Refrigerant is a kind of refrigeration working medium used in refrigeration cycle systems in refrigeration equipment. This article will introduce the characteristics and functions of several common refrigerants.
The nature of the refrigerant is directly related to the refrigeration effect of the refrigeration device, and even personal safety. Therefore, it is very necessary to understand some commonly refrigerant gases and their properties.
1. Refrigerant R717 (ammonia)
Ammonia is currently the most widely used medium pressure and medium temperature refrigerant. The solidification temperature of ammonia is -77.7°C, the standard evaporation temperature is -33.3°C, and the condensation pressure at room temperature is generally 1.1-1.3MPa, even when the cooling water temperature in summer is as high as 30°C, it does not exceed 1.5MPa. Mainly used in large-scale industrial refrigeration and commercial refrigeration and cold storage.
Easy to obtain, low price, moderate pressure, large unit refrigeration capacity, high heat release coefficient, almost insoluble in oil, low flow resistance, and easy to find when leaking. But it has a pungent odor, is toxic, can burn and explode, and has a corrosive effect on copper and copper alloys.
Refrigerant R22: Refrigerant R22 is a medium-temperature refrigerant. Its standard boiling point is -40.8°C. The solubility of water in Refrigerant R22 is very small, and it dissolves with mineral oil. Refrigerant R22 does not burn or explode and has little toxicity. , Refrigerant R22 has a strong penetrating ability, and leakage is difficult to find.
Widely used in air conditioners, heat pumps, dehumidifiers, refrigeration dryers, cold storage, food refrigeration equipment, marine refrigeration equipment, industrial refrigeration, commercial refrigeration, refrigeration condensing units, supermarket display cabinets, and other refrigeration equipment.
Refrigerant R134a is an alternative refrigerant to Refrigerant R12. Refrigerant R134a has very low toxicity and is non-flammable in the air. GF is used in: refrigerators, freezers, water dispensers, automobile air conditioners, central air conditioners, dehumidifiers, cold storage, commercial refrigeration, ice water machines, ice cream machines, refrigeration condensing units, and other refrigeration equipment
The chemical stability of Refrigerant R134a is very good. However, due to its high water solubility, it is not good for the refrigeration system. Even if there is a small amount of water, it will produce acid, carbon dioxide, or carbon monoxide under the action of lubricating oil. Corrosion or "copper plating" is produced, so Refrigerant R134a requires higher drying and cleaning of the system.
Refrigerant R404a is a mixture of HFC125, HFC-134a, and HFC-143. It is a colorless gas at room temperature and a colorless and transparent liquid under its own pressure. It is a non-azeotropic refrigerant without chlorine. It is suitable for new commercial refrigeration equipment, transportation refrigeration equipment and refrigeration equipment at medium and low temperature.
Refrigerant R404a is mainly used to replace Refrigerant R22 and Refrigerant R502. It has the characteristics of cleanliness, low toxicity, non-combustibility, and a good cooling effect. It is widely used in medium and low-temperature refrigeration systems. Its ODP is 0, so Refrigerant R404a is a refrigerant that does not destroy the ozone layer of the atmosphere.
Refrigerant R410a is mainly used to replace Refrigerant R22 and Refrigerant R502. It has the characteristics of cleanliness, low toxicity, non-combustibility, and a good cooling effect. It is widely used in household air conditioners, small commercial air conditioners, household central air conditioners, etc.
The working pressure is about 1.6 times that of the ordinary Refrigerant R22 air conditioner, and the cooling (heating) efficiency is high. Refrigerant R410a refrigerant is composed of two quasi-azeotropic mixtures, Refrigerant R32 and Refrigerant R125, each consisting of 50%, mainly composed of hydrogen, fluorine, and carbon elements. Refrigerant R410a is internationally recognized as the most suitable refrigerant to replacing Refrigerant R22, and it has been popularized in Europe, America, Japan, and other countries.
Refrigerant R290 (propane), also known as cold coal, is a new type of environmentally friendly refrigerant. Mainly used in central air conditioners, heat pump air conditioners, household air conditioners, and other small refrigeration equipment. High-purity Refrigerant R290 is used as a temperature-sensing working fluid; premium and first-class Refrigerant R290 can be used as a refrigerant to replace Refrigerant R22 and Refrigerant R502, compatible with the original system and lubricating oil, and used for central air conditioning, heat pump air conditioning, household air conditioning, and Other small refrigeration equipment.
The test proves that the perfusion volume of Refrigerant R290 under the same system volume is about 43% of that of Refrigerant R22. Since the latent heat of vaporization of Refrigerant R290 is about twice that of Refrigerant R22, the refrigerant circulation volume of the refrigeration system using Refrigerant R290 is smaller. Using Refrigerant R290 refrigerant, the energy-saving rate can reach 10~35%.
The fatal flaw of Refrigerant R290 "flammable and explosive" is extremely lethal. Refrigerant R290 can form an explosive mixture when mixed with air. It may burn and explode when exposed to heat sources and open flames.
Refrigerant R23 refrigerant does not destroy the ozone layer at all. It is an environmentally friendly refrigerant recognized and recommended by most countries in the world, and it is also one of the mainstream environmentally friendly refrigerants.
Refrigerant R23 is a widely used ultra-low temperature refrigerant. Due to the good comprehensive performance of HFC-23, Refrigerant R23 is mainly used in environmental test chambers/equipment (thermal shock test machines), freeze dryers/freeze dryers, ultra-low temperature refrigerators or freezers, Cryogenic equipment such as blood bank refrigerators, and biochemical test chambers, including scientific research refrigeration, medical refrigeration, etc., are often used in low-temperature grades of these cascade refrigeration systems.
Refrigerant R507 is a non-chlorine azeotropic mixed refrigerant. It is a colorless gas at room temperature and pressure. It is a compressed liquefied gas stored in a cylinder. Refrigerant R507 and Refrigerant R404A are the same refrigerants used to replace Refrigerant R502, but Refrigerant R507 can usually reach a lower temperature than Refrigerant R404A. Refrigerant R507 is suitable for new commercial refrigeration equipment at medium and low temperatures, supermarket refrigerated cabinets, cold storage, display cabinets, transportation, ice-making equipment, transportation refrigeration equipment, marine refrigeration equipment, or updated equipment. It is suitable for all Refrigerant R502 that can operate normally surroundings.
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