Refrigerant

Abstract

The invention discloses a novel environment-friendly refrigerant which comprises 55 to 10wt% of propane and 45-90wt% of difluoromethane. The ODP value of the refrigerant is zero, and an atmospheric ozone layer is not destroyed; compared with HCFC-22 and a traditional substitute R410A, the GWP value is greatly lowered, and the environmental protection performance is better. The lower combustion limit of the refrigerant is much higher than that of HC-290, the exhaust temperature is much lower than that of HFC-32, the thermal performance is equivalent to that of the R410A, the refrigerant can be used in a system which originally uses the R410A, and the charging quantity can be reduced. The refrigerant can be used as a long-term substitute of the HCFC-22 and the R410A and provides a reliable technology with easy generalization and application and rapid effect taking for coping with global warming.

Description

technical field [0001] The invention relates to a refrigerant, in particular to a refrigerant used in refrigeration, air-conditioning, heat pumps and other equipment to replace HCFC-22 and its current substitute R410A, which has zero potential to destroy atmospheric ozone, very low greenhouse effect, and strong practicability Environmentally friendly refrigerants provide a reliable technology that is easy to popularize and apply, and has quick results for the global response to climate warming. Background technique [0002] HCFC-22 has become the most widely used refrigerant with the best comprehensive performance in the refrigeration and air-conditioning industry at home and abroad due to its excellent physical, chemical and thermodynamic properties as well as good use safety and economy. However, HCFC-22 has ODP (ozone depletion Potential) value and higher GWP (global warming potential) value, which is not friendly to the environment, and has been required by the Conferenc...

AI Technical Summary

Problems solved by technology

[0004] Most of the above-mentioned mixed refrigerants are mixtures of ternary and above components, among which there are either high GWP values, strong flammability, unknown toxicity of one of the components, or a certain element that is expensive or not yet available. Containing HCFC-22 and other problems, only R410A and R407C have been widely used, and R407C has been gradually replaced by R410A due to reasons such as high slip temperature. In fact, so far, R410A is the most popular alternative to HCFC-22 thing

However, R410A has a higher GWP value than HCFC-22. When the world is extremely concerned about global warming, refrigerants with high GWP value are also facing the situation of being restricted and eliminated. At this time, R410A is not an ideal HCFC. -22 substitutes

At present, from the point of view of the new requirements for environmental protection with equal emphasis on ODP and GWP, HFC-32 (ODP=0, GWP=675) and HC-290 (ODP=0, GWP=20) are the best alternatives for HCFC-22 as pure working fluids. The best substitute, HC-290 is not only environmentally friendly, but also has excellent thermal performance, but it has strong flammability, and the lower limit of combustion is 2.3%, which greatly limits its application. The lower limit is higher (13.3%), but its pressure is high, especially the exhaust temperature is 20-30°C higher than that of R410A, which may have an extremely adverse effect on the compressor in actual application, and the practicability is poor

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