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Commonly used refrigerants properties
in Chinese household air conditioning, there are four commonly used refrigerant R22, r410a, R32, R290, that these are what features, let's look at the characteristics of them.
1, the physical and chemical properties:
refrigerant name
R22
R290
R410A
R32
formula
CHClF2
C3H8
CH2F2 / C2HF5 ( Mixture)
CH2F2
molecular weight
86. 47
44。 1
72。 58
52。 02
2, environmental protection features:
refrigerant name
R22
R290
R410A
R32
the ODP
0. 0 05
0
0
GWP
1810
two
2100
675
3, toxicity aspects: specific data are shown in table 1, four kinds of occupational exposure limit of refrigerant volume concentration, the same relative R22, R32 and acute toxicity of R410A is lower, and R290 slightly higher.
4, combustion characteristic aspects: from the burning lower limit temperature, automatic lighting, minimum ignition energy, combustion rate and combustion heat five metrics ( Specific value shown in table 1) , the flammability of R290 was much higher than that of R32, R290 is A3 level security and R32 A2L safety level. Non-combustible, R22 and R410A A1 security levels.
note: burning level is divided into: 1 No flammable, 2 - Moderate combustible, 3 - Highly flammable, 2 l - The combustible. Highly flammable refrigerants are: R290 and R1270, R600a, R161, etc; Micro flammable refrigerants are: R32, R717, R1234yf, etc.
5, saturated vapor pressure, the index is higher, the higher the system pressure requirements
refrigerant name
R22
R290
R410A
R32
%
100%
89 ~ 93%
157 ~ 159%
162%
6, density, the smaller the parameter values, the smaller the refrigerant filling quantity
refrigerant name
R22
R290
R32 saturated liquid density
100%
41. 2% ~ 41. 78年
4%。 6% ~ 82. 8%
saturated vapor phase density
100%
41. 1% ~ 45. 103年
4%。 6% ~ 112. 1%
7, specific heat at constant pressure, the indexes, the greater the heat transfer effect, the better.
refrigerant name
R22
R290
R32
liquid phase specific heat capacity
1
2. 13 ~ 2. 186 times
1. 484-1. 649 times
saturated gas heat capacity than
1
2. 313-2. 425 times
1. 653-2. 083 times
8, phase change latent heat: the indexes, the greater the heat transfer effect better and refrigerant mass flow rate, the smaller cycles.
refrigerant name
R22
R290
R32
%
1
1. 825-1. 841 times
1. 401-1. 552
9, filling quantity contrast: the direct response filling quantity index relative size.
refrigerant name
R22
R290
R410A
R32
%
100%
40%
113%
91%
10, compared with R22, thermodynamic cycle analysis conclusion is as follows:
theory to investigate and compression ratio, under a given thermal conditions, investigate the cannot reflect the actual effect, here don't give a conclusion.
exhaust temperature: the better the reliability index is lower, the compressor
refrigerant name
R22
R290
R410A
R32
nominal working condition of refrigeration
0
- 16. 8℃
+ 4。 8℃
+ 13。 5 ℃
high temperature working condition of refrigeration
0
- 20. 7℃
+ 5。 4℃
+ 17。 1 ℃
the quality system of refrigeration/heat: the smaller the index, the greater the refrigerant circulation flow.
refrigerant name
R22
R290
R410A
R32
nominal working condition of refrigeration
100%
177. 101年
1%。 152年
5%。 5%
nominal working condition of heating
100%
177. 2%
105. 156年
3%。
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