Commercial refrigeration commonly used refrigerants (1)
commercial refrigeration refrigerant
C02
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02 It was mainly used in commercial refrigeration for half a century because of its good performance on land. After 1930, the widespread use of
CFC refrigerant eliminated C02. Due to the current elimination of CFC, CO2 has been valued and applied again. C02's ODP=O, GWP=1, safety level Al
, becoming an important substitute for CFC and HCFC substances. Its other advantages are: the refrigeration rupee R22 is 5 times larger; the pressure ratio of the compressor is small; the heat transfer performance is good
; the relative pressure loss during flow is small; the price is low; it is compatible with machine materials. However, the critical temperature of CO2 is 31°C, which makes the pressure on the high-pressure side under normal cooling conditions exceed
and the boundary pressure is as high as 10MPa. Therefore, in 1994, Lorentzen proposed the CO2 transcritical cycle and measures to achieve high cycle efficiency, and the automobile air-conditioning device developed accordingly Heleng
water heating device has been applied. When the C02 and ammonia are combined into a cascade unit, the C02 cycle is the low-temperature level of the cascade device. When used in frozen food, it can avoid direct contact between ammonia and cold
frozen food.
Hydrocarbons
The common feature of commercial refrigeration refrigerants is: low freezing point,It does not react chemically with water and does not corrode metals; it has good oil solubility. They are products of the petrochemical stream , which are easy to obtain and inexpensive. The common shortcoming is strong flammability. Therefore, they are mainly used as refrigerants in petrochemical refrigeration equipment. Petroleum chemical production has strict fire-proof and explosion-proof safety facilities, and the refrigerant is the product of the process itself, and its suitability is obvious. For refrigeration systems that use hydrocarbons as refrigeration agents, the low pressure side should maintain positive pressure or the system should be strictly sealed, otherwise, once the air infiltrates, there is a danger of explosion. Currently commonly used are alkanes and alkenes hydrocarbon refrigerants. The chemical nature of the former is very inactive; the chemical nature of the latter is active. They are not soluble in water, but easily soluble in organic solvents. For example, ethane is easily soluble in ether and alcohol organics; ethylene and propylene are easily soluble in alcohol and other organic solvents.
The refrigerating temperature range of propylene is equivalent to that of R22. It can be used in two-stage compression refrigeration equipment, and can also be used as a high-temperature refrigerant in cascade refrigeration equipment. Ethane,
ethylene has the same refrigeration temperature range as R13, and is only used in the low temperature part of the cascade refrigeration system. Methane can be combined with ethylene and ammonia (or propane) to form a ternary cascade
refrigeration system to obtain a low temperature of about 1500C for use in natural gas liquefaction plants. N-butane, isobutane or a mixture of n-butane and isobutane can be used in domestic commercial refrigeration
. The GWP of hydrocarbons is very low, about 20, and the safety level is A3. Their flammability issues need to be considered in conjunction with the size and layout of the cooling or heating space.
can be determined according to standards (eg: IEC60335-2-40:2005, IEC60335-2d89:2007, EN378:2008). The allowable filling volume of the equipment. The UL standard (such as UL471:2009) does not limit the filling volume, but specifies the leakage volume. The above article comes from refrigerated showcase commercial refrigeration. For details, please visit the company's website: www.ihdjx.com
Free order hotline: +86 18019567573
Contact: Mr. Shao 60n n3662nn50@0n n 2608nn6
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