CN101395242B - Refrigerant composition - Google Patents

Abstract

A refrigerant composition consists essentially of two hydrofluorocarbon components selected from HFC134a, HFC125 and HFC143a and an additive selected from a saturated or unsaturated hydrocarbon or mixture thereof boiling in the range -5O DEG C and +4O DEG C.

Description

Refrigerant composition

Invention field

The present invention relates to a kind of special but non-refrigeration agent that only is used for refrigeration system.This system relates in particular to the refrigerant composition that atmospheric ozone layer is had no adverse effect and relates to and be used in the composition that comprises for use in the refrigeration system that the Ozone Depleting Substances (ODS) such as CFC502 (azeotropic mixture of chlorine five fluoromethane and chlorodifluoromethane) and HCFC22 (chlorodifluoromethane) design.Lubricant commonly used in these refrigerant compositions and refrigeration and the air-conditioning system is compatible, also with comprise but non-be limited to polyvalent alcohol ester oil and polyalkylene glycol oil to contain the oxygen lubricant compatible.

Composition of the present invention also can be used for new installation.

Although people prevent refrigrant leakage quite carefully in atmosphere, this situation still happens occasionally.Discharging at some regional hydrocarbon is controlled, this be for will hydrocarbon and the generation of the Tropospheric ozone that under the effect of sunlight, causes after mixing of oxygen minimize.Will be with the leakage of the composition of indication of the present invention and the hydrocarbon that causes the effect of atmosphere is minimized, the content of hydrocarbon preferably should be less than 5%, if be less than 3% better.

Background of invention

Chlorofluorocarbons (CFCs) (CFCs, for example CFC11, CFC12, CFC502) and Hydrochlorofluorocarbons (HCFCs, for example HCFC22, HCFC123) be stable, hypotoxicity and have non-inflammability can provide the working conditions of low danger when being used for refrigeration and air-conditioning system.After being released such as it, but they can diffuse into stratosphere and attack the ozonosphere that protection of the environment is avoided ultraviolet damage.The international environmental agreement Montreal protocol of being signed by more than 160 countries requires progressively to stop using CFCs and HCFCs. according to agreed timetable

CFCs and HCFCs are replaced by hydrogen fluorohydrocarbon pure fluid or mixture (HFCs, for example HFC134a, HFC125, HFC32, HFC143a, HFC152a) in air-conditioning, refrigeration and heat-pump apparatus.Yet, because HFCs does not have enough solvabilities in traditional lubricant such as mineral oil or alkylbenzene oil, so in novel appts, introduce especially the synthetic oxygen lubricant that contains.These new lubricants are expensive and have a water absorbability.

Some refrigeration agent such as R407C, it has wider (〉 4 ℃ in vaporizer and condenser) temperature glide.Equipment manufacturers more are ready to select the low refrigeration agent of temperature glide based on the experience of their gained on CFC/HCFC single fluid or azeotropic mixture.Another object of the present invention provides the HFC/ hydrocarbon miscellany that can replace R22 and azeotropic mixture R502 (CFC115/HCFC22) so that hydrocarbon lubricants can continue to use in equipment, and by providing azeotropic and nearly azeotropic formulation that the temperature glide in the heat exchanger is reduced to minimum.

Different term description refrigerant mixtures have been used in the patent documentation.Following definition comes from ASHRAE standard 34;

Azeotropic mixture: azeotropic mixture is the refrigeration agent that comprises two or more, and these refrigeration agents are identical in the vapor phase of balance with composition in the liquid phase under certain pressure.Azeotropic mixture shows the separation of the composition of certain degree under the other condition.Separation degree depend on specific azeotropic mixture with and use.

Azeotropic temperature: under specified pressure, be in the temperature of each component when each component in the gas phase has identical molar fraction in the liquid phase of mixture of equilibrium state.

Nearly azeotropic mixture: in specific analysis of using, temperature glide is little of ignoring and the zeotrope of unlikely generation error.

Zeotrope: the mixture that is formed by the different component of a plurality of volatility, when its when being used for refrigeration cycle, when evaporation (boiling) or condensation, this mixture can change capacity composition and temperature of saturation under constant pressure.

Temperature glide: the refrigeration agent in the element of refrigeration system when phase transition process begins temperature and the temperature when finishing between the absolute value of difference, do not comprise the situation that any mistake is cold or overheated.This term is commonly used to describe condensation or the evaporation of zeotrope.

The present invention relates to azeotropic, nearly azeotropic and non-azeotropic refrigerant composition, it is not flammable under ASHRAE standard 34 defined all fractionation conditions, and can be used to replace the ODS in existing or new unit and need not to change lubricant, also need not system hardware is done any large change.

A small amount of hydrocarbon added in the refrigeration agent constituent that contains HFC or HFC mixture enough hydrocarbon are dissolved in the lubricant that transmits in system, thereby keep the lubricated of compressor always, this is known in this area.But also not clear is how under all conditions (to be included in refrigeration agent from system or when lay up period leaks, under the condition of the fractionation of generation refrigerant composition) all can obtain not flammable composition.

Under the definition of ASHRAE standard 34, be not all HFCs all be non-flammable.HFC143a does not obtain the non-inflammability grading of ASHRAE.The refrigerant composition that the present invention relates to, it comprises non-flammable HFC125 and flammable HFC143a and the mixture of hydrocarbon of selected ratio; All these compositions all are non-flammable in fractionation, and these mixtures provide refrigeration and the thermomechanical property similar with its ODS that is substituted (being R502 and R22).

Although the present invention relates to the refrigerant compositions that can use with conventional lubricant such as mineral oil and alkylbenzene oil, it also is fit to use with the synthesizing oxygen-containing lubricant.

For preventing mixture or the combustibility such as ASHRAE standard 34 defined fractions that is produced by leakage, the total amount of hydrocarbon should be reduced to minimum.Simultaneously, the amount that needs to be dissolved in the hydrocarbon miscellany in the oil is increased to maximum so that the backflow of oil is good, and the zone of oil viscosity maximum in the loop especially is in vaporizer.The hydrocarbon that single boiling point is higher, as butane or Trimethylmethane certainly can be lower than boiling point hydrocarbon, in oil, show higher solubleness such as propane.If but when leakage from cylinder for example occured, the hydrocarbon of higher was concentrated in the liquid phase.Therefore, need the amount of restriction hydrocarbon to avoid when leakage closes on terminal point, generating fuel mixture.

Only use and to avoid this problem such as the low boiling hydrocarbon of propane.Yet done like this two drawbacks: the first, when existing with similar weight percent in prescription, low boiling hydrocarbon more is difficult for being dissolved in hydrocarbon lubricants in the vaporizer than high boiling hydrocarbon, so its efficient aspect the backflow that guarantees good oil is lower; The second, because its volatility is high, the low boiling hydrocarbon tendency concentrates in the gas phase of mixture.Therefore, need to limit its concentration to avoid when leaking beginning, generating fuel mixture.If more lower boiling HFC is also flammable, this problem is then more serious.

The ratio of R143a and R125 and in the presence of the Trimethylmethane of more lower boiling propane and higher, the result has produced incombustible mixture under ASHRAE standard 34 defined least favorable fractionation conditions.Following experimental result is finished by external laboratory independently:

Sample 1:%

R125 76.81

R143a 18.66

Propane 2.38

Trimethylmethane 2.16

Total hydrocarbon content 4.54

Use is carried out flammability test to this mixture according to 12 liters of flasks of ASHRAE standard 60 ℃ the time, and finds that it is not flammable.

Sample 2:%

R125 74

R143a 22

Trimethylmethane 4

Carry out same flammability test according to 1 pair of this mixture of sample, find that this mixture is flammable, and in the time of 60 ℃, have 15% ^V/The V lower flammable limit.

In the EP1238039B1 patent, owing to the combustibility of considering under worst fractionation conditions, the Roberts instruction is not included in methylpropane (Trimethylmethane) in the mixture that contains HFC.At US6, in 526, the 764B1 patent, owing to not wishing to make the pressure in the system to increase, the Honeywell instruction does not add propane.

It is shocking, we have found that propane added the composition include HFC125 and HFC143a and can produce lower combustibility during such as the HFC mixture of the higher hydrocarbon of Trimethylmethane etc., thereby so that under all fractionation conditions under the ASHRAE standard 34 this mixture not flammable.This hydrocarbon that is dissolved in simultaneously oil in the vaporizer so that the hydrocarbon total amount of this mixture reduces increases.

The invention enables flammable HFC such as HFC143a can be used for non-combustible refrigerant mixture, thereby greatly improve its performance, especially its capacity.

US5,211, No. 867 patents propose the claim of the Azeotrope compositions of R125 and R143a, but it does not instruct hydrocarbon effectively to add in the mixture of these two kinds of HFCs.A wherein key feature of the present invention is to introduce the mixture of a kind of hydrocarbon of special selection or hydrocarbon so that oil is easy to be back to compressor.It is shocking, be flammable although found HFC143a, and the mixture of selected hydrocarbon or hydrocarbon is so that said composition becomes when fractionation is non-flammable.The content of hydrocarbon increase in liquid phase when leaking has been avoided in the combination of lower boiling hydrocarbons such as propane (BP-45.5 ℃) and high boiling hydrocarbon such as butane (BP-0.5 ℃) and/or Trimethylmethane (BP-11.5 ℃), and the combustibility of the propane that volatility is stronger is then by constrain with the vapor of mixture of chemically-acting fire suppressors HFC125.

When searching was easy to replace the refrigerant mixture of R22 in the existing installation or R502, particularly importantly novel mixture should have enough refrigeration capacities.This capacity similarly should be at least 90% of its fluid that substitutes under the working conditions, be at least its fluid that substitutes 95% for preferred, most preferably be and equate with its fluid that substitutes or more.If the novel mixture that the use capacity is too low then has very large risk to allow refrigeration system can not keep the low temperature of wanting under high-load condition, thereby cause the frozen product of low tempertaure storage or other material preservation time limit to shorten.

When selecting suitable refrigerant mixture, the reliability of equipment is also very important.This mixture contains hydrocarbon, has guaranteed that the oil that leaves compressor sump is back to fuel tank, thereby prevents from staying in the system other local bearing of compressor that occurs and the lubricated inadequate situation of piston because of oil.

Another important factor is to leave the exhaust temperature of the refrigeration agent of compressor.If exhaust temperature is too high, then may be because of overheated and/or damage outlet valve because of the deposition that comes from oil and the solid decomposer of refrigeration agent.The exhaust temperature of mixture shown in the example all is lower than the exhaust temperature of R503, and more much lower than the exhaust temperature of R22.This mixture has benefited from not having the existence of chlorine equally.R502 and particularly R22 may generate corrosive hydrochloric acid when exhaust temperature, if when particularly having minor amount of water.

Mainly formed by a hydrogen fluorohydrocarbon component and an additive according to refrigerant composition of the present invention.Hydrogen fluorohydrocarbon component is by at least a following compositions of mixtures:

R125 and R143a

Additive then is selected from stable hydrocarbon or its mixture that seethes with excitement in-50 ℃ and+40 ℃ of scopes.

In the first preferred embodiment, the amount of hydrocarbon is 0.1 to 5%, and is non-flammable when said composition is in gas phase fully wherein.

In the second preferred embodiment, the amount of hydrocarbon is 0.1 to 5%, and wherein in the container that the liquids and gases of said composition all exist, gas phase and liquid phase are not flammable.

In a preferred embodiment, one can be used to replace the refrigerant composition of R502 to comprise:

(i) the about R125 of 50 to 94.9 weight percents is preferably the R125 of 66 to 84.7 weight percents; And

(ii) the about R143a of 5 to 45 weight percents is preferably the R143a of 15 to 30 weight percents; And

(iii) the approximately butane of 0.1 to 5 weight percent or Trimethylmethane or propane are preferably butane or Trimethylmethane or the propane of 0.3 to 4 weight percent.

In another embodiment, one can be used to replace the refrigerant composition of R502 to comprise:

(i) the about R125 of 45 to 94.8 weight percents is preferably the R125 of 62 to 84.4 weight percents; And

(ii) the about R143a of 5 to 45 weight percents is preferably the R143a of 15 to 30 weight percents; And

(iii) the approximately butane of 0.1 to 5 percentage by weight and approximately mixture or the mixture of butane (0.1 to 5) and propane (0.1 to 5%) or the mixture of iso-butane (0.1 to 5%) and propane (0.1 to 5%) of the iso-butane of 0.1 to 5 percentage by weight, be preferably the butane (0.3 to 4%) of 0.3 to 4 percentage by weight and mixture or the mixture of butane (0.3 to 4%) and propane (0.3 to 4%) or the mixture of iso-butane (0.3 to 4%) and propane (0.3 to 4) of iso-butane (0.3 to 4%).

In another preferred embodiment, one can be used to replace the refrigerant composition of R502 to comprise:

(i) the about R125 of 40 to 94.7 weight percents is preferably the R125 of 58 to 84.1 weight percents; And

(ii) the about R143a of 5 to 45 weight percents is preferably the R143 of 15 to 30 weight percents; And

(iii) the approximately butane of 0.1 to 5 weight percent and approximately Trimethylmethane and the about mixture of the propane of 0.1 to 5 weight percent of 0.1 to 5 weight percent are preferably the butane (0.3 to 4%) of 0.3 to 4 weight percent and the mixture of Trimethylmethane (0.3 to 4%) and propane (0.3 to 4%).

One can be used to replace the preferred composition of R502 mainly to comprise:

R125 82.4 to 68%

R143a 17 to 27%

Trimethylmethane 0.3 to 3%

Propane 0.3 to 2%

Another can be used to replace the preferred composition of R502 mainly to comprise:

R125 77％

R143a 20％

Trimethylmethane 2%

Propane 1%

Provide the Azeotrope compositions that can be used to replace R502 in another particularly preferred embodiment, it comprises: %

Mixture 1 mixture 2

R125 73.07 73.07

R143a 23.87 23.87

Propane 0.31 0.6

Trimethylmethane 2.75 2.46

One preferred composition mainly comprises:

R125 94.9 to 50%

R143a 5 to 45%

Butane 0.1 to 5%

One preferred composition mainly comprises:

[0078]R125 84.7 to 66%

R143a 15 to 30%

Butane 0.3 to 4%

[0081]One particularly preferably composition mainly comprise:

R125 77.5％

R143a 20％

Trimethylmethane 2.5%

Another preferred composition mainly comprises:

R125 78％

R143a 20％

Trimethylmethane 2%

Another preferred composition mainly comprises:

R125 79％

R143a 18％

Trimethylmethane 3%

Another preferred composition mainly comprises:

R125 77.2％

R143a 20％

Trimethylmethane 2.8%

One preferred composition mainly comprises:

R125 94.9 to 50%

R143a 5 to 45%

Trimethylmethane 0.1 to 5%

One preferred composition mainly comprises:

R125 84.7 to 66%

R143a 15 to 30%

Trimethylmethane 0.3 to 4%

One preferred composition mainly comprises:

R125 94.9 to 50%

R143a 5 to 45%

Propane 0.1 to 5%

One preferred composition mainly comprises:

R125 84.7 to 66%

R143a 15 to 30%

Propane 0.3 to 4%

One preferred composition mainly comprises:

R125 94.8 to 45%

R143a 5 to 45%

Butane 0.1 to 5%

Trimethylmethane 0.1 to 5%

One preferred composition mainly comprises:

R125 84.4 to 62%

R143a 15 to 30%

Butane 0.3 to 4%

Trimethylmethane 0.3 to 4%

One preferred composition mainly comprises:

R125 94.8 to 45%

R143a 5 to 45%

Butane 0.1 to 5%

Propane 0.1 to 5%

One preferred composition mainly comprises:

R125 84.4 to 62%

R143a 15 to 30%

Butane 0.3 to 4%

Propane 0.3 to 4%

One preferred composition mainly comprises:

R125 94.8 to 45%

R143a 5 to 45%

Trimethylmethane 0.1 to 5%

Propane 0.1 to 5%

One preferred composition mainly comprises:

R125 84.4 to 62%

R143a 15 to 30%

Trimethylmethane 0.3 to 4%

Propane 0.3 to 4%

One preferred composition mainly comprises:

R125 94.7 to 40%

R143a 5 to 45%

Butane 0.1 to 5%

Trimethylmethane 0.1 to 5%

Propane 0.1 to 5%

One preferred composition mainly comprises:

R125 84.1 to 58%

R143a 15 to 30%

Butane 0.3 to 4%

Trimethylmethane 0.3 to 4%

Propane 0.3 to 4%

One preferred composition mainly comprises:

R125 82.4 to 68%

R143a 17 to 27%

Trimethylmethane 0.3 to 3%

Propane 0.3 to 2%

One preferred composition mainly comprises:

R125 73.07％

R143a 23.87％

Propane 0.31%

Trimethylmethane 2.75%

One preferred composition mainly comprises:

R125 73.07％

R143a 23.87％

Propane 0.6%

Trimethylmethane 2.46%

One preferred composition mainly comprises:

R125 73.07％

R143a 23.87％

Trimethylmethane 3.06

This specification sheets indication per-cent and other ratio, except as otherwise noted, be by weight and in open scope, select to total amount be 100%.

In a preferred embodiment of the present invention, refrigerant composition mainly is comprised of a hydrogen fluorohydrocarbon component and an additive, and this hydrogen fluorohydrocarbon component comprises:

R125 83 to 71%;

With

R143a 17 to 29%

Additive then is selected from saturated or unsaturated hydrocarbons or its mixture of-50 ℃ and+15 ℃ interior boilings of scope.

This hydrocarbon additive can be selected from 2-methylpropane, propane, 2,2-dimethylpropane, n-butane, 2-methylbutane, pentamethylene, hexane, ethane, 2-methylpentane, 3-methylpentane 2,2-dimethylbutane, methylcyclopentane and above mixture.

Can be used to replace R502 and R22 first particularly preferably refrigerant composition mainly comprise:

R125 82.7 to 71.5%

R143a 17 to 25%

Butane 0.3 to 3.5%

Can be used to replace R502 and R22 second particularly preferably refrigerant composition mainly comprise:

R125 80.4 to 75%

R143a 19 to 22%

Butane 0.6 to 3

Can be used to replace another preferred refrigerant composition of R502 and R22 mainly to comprise:

R125 82.7 to 71.5%

R143a 17 to 25%

Trimethylmethane 0.3 to 3.5%

Can be used to replace another preferred refrigerant composition of R502 and R22 mainly to comprise:

R125 80.4 to 75%

R143a 19 to 22%

Trimethylmethane 0.6 to 3%

One can be used to replace the preferred refrigerant composition of R502 and R22 mainly to comprise:

[0198]R125 82.7 to 73%

R143a 17 to 25%

Propane 0.3 to 2%

[0201]Can be used to replace another preferred refrigerant composition of R502 and R22 mainly to comprise:

R125 80.7 to 76.5%

R143a 19 to 22%

Propane 0.3 to 1.5

Can be used to replace another preferred refrigerant composition of R502 and R22 mainly to comprise:

R125 82.4 to 71%

R143a 17 to 25%

Butane 0.3 to 2%

Trimethylmethane 0.3 to 2%

Can be used to replace another preferred refrigerant composition of R502 and R22 mainly to comprise:

R125 79.8 to 74.5%

R143a 19 to 22%

Butane 0.6 to 1.75%

Trimethylmethane 0.6 to 1.75%

Can be used to replace another preferred refrigerant composition of R502 and R22 mainly to comprise:

R125 82.4 to 71%

R143a 17 to 25%

Butane 0.3 to 2.5%

Propane 0.3 to 1.5%

Can be used to replace another preferred refrigerant composition of R502 and R22 mainly to comprise:

R125 79.8 to 75%

R143a 19 to 22%

Butane 0.6 to 2%

Propane 0.6 to 1%

Can be used to replace another preferred refrigerant composition of R502 and R22 mainly to comprise:

R125 82.4 to 71%

R143a 17 to 25%

Trimethylmethane 0.3 to 2.5%

Propane 0.3 to 1.5%

Another that can be used to replace R502 and R22 particularly preferably refrigerant composition mainly comprises:

R125 79.8 to 75%

R143a 19 to 22%

Trimethylmethane 0.6 to 2%

Propane 0.6 to 1%

Can be used to replace the most particularly preferably refrigerant composition of R502 and R22 mainly to comprise:

R125 77.5％

R143a 20％

Trimethylmethane 1.9%

Propane 0.6%

The present invention further specifies by following non-limitative example.

Example 1

Use NIST circulation D program under typical cryogenic refrigeration condition, to determine R125, R143a, the numerical value of R290 and R600a mixture.

Output cooling load 10kW

Vaporizer

Overheated 5.0 ℃

1.5 ℃ of suction line pressure drops (in the temperature of saturation)

Condenser

35.0 ℃ of mid point fluid condensing temperatures

Cross cold 5.0 ℃

1.5 ℃ of vent line pressure drops (in the temperature of saturation)

Liquid line/suction line heat exchanger

Efficient 0.3

Compressor

Compressor isentropic efficiency 0.7

Compressor volume efficient 0.82

Parasitic power

Evaporator fan 0.3kW

Condenser fan 0.4kW

Controller 0.1kW

Use the performance of above-mentioned operating condition analysis in unit cooler, the result is as shown in table 1 and table 2.

Table 1

Refrigeration agent	1	2	3	4	5	6
							% by weight 125	77.5	77.5	77.5	77.5	77.5	77.5
% by weight 143a	20	20	20	20	20	20
							% by weight 600a	1.9	1.9	1.9	1.9	1.9	1.9
% by weight 290	0.6	0.6	0.6	0.6	0.6	0.6
							Vaporization temperature (℃)	-50	-40	-30	-20	-10	0
Blowdown presssure (bar)	17.58	17.58	17.58	17.58	17.58	17.58
							Exhaust temperature (℃)	99.5	88.7	79.5	71.6	64.6	58.5
COP (system)	0.97	1.20	1.48	1.85	2.33	3.00
							Capacity (kw/m 2)	355	590	937	1434	2125	3068
Temperature glide in the vaporizer (℃)	0.37	0.42	0.47	0.52	0.56	0.60
							Temperature glide in the condenser (℃)	0.66	0.66	0.66	0.66	0.66	0.66

Table 2

Refrigeration agent	1	2	3	4	5	6
							% by weight 125	77.5	77.5	77.5	77.5	77.5	77.5
% by weight 143a	20	20	20	20	20	20
							% by weight 600a	2.5	2.5	2.5	2.5	2.5	2.5
Vaporization temperature (℃)	-50	-40	-30	-20	-10	0
							Blowdown presssure (bar)	17.26	17.26	17.26	17.26	17.26	17.26
Exhaust temperature (℃)	99.3	88.5	79.3	71.4	64.5	58.4
							COP (system)	0.98	1.20	1.48	1.85	2.34	3.01
Capacity (kw/m 2)	349	580	922	1411	2092	3021
							Temperature glide in the vaporizer (℃)	0.3	0.3	0.4	0.4	0.5	0.5
Temperature glide in the condenser (℃)	0.6	0.6	0.6	0.6	0.6	0.6

Example 2

Use NIST circulation D program under typical cryogenic refrigeration condition, to determine the numerical value of R125, R143a and R290 mixture.

Output cooling load 10kW

Vaporizer

Mid point fluid condensing temperature-30 ℃

Overheated 5.0 ℃

1.5 ℃ of suction line pressure drops (in the temperature of saturation)

Condenser

35.0 ℃ of mid point fluid condensing temperatures

Cross cold 5.0 ℃

1.5 ℃ of vent line pressure drops (in the temperature of saturation)

Liquid line/suction line heat exchanger

Efficient 0.3

Compressor

Compressor isentropic efficiency 0.7

Compressor volume efficient 0.82

Parasitic power

Evaporator fan 0.3kW

Condenser fan 0.4kW

Controller 0.1kW

Use the performance of above-mentioned operating condition analysis in unit cooler, the result is as shown in table 3.

Table 3

Refrigeration agent	1	2	3	4	5
						% by weight 125	73	75.5	77	81	74
Heavy %143a	25	23	21	17	25
						% by weight 290	2	1.5	2	2	1
Blowdown presssure (bar)	17.63	17.55	17.76	17.90	17.34
						Exhaust temperature (℃)	80.8	80.3	80.1	79.5	80.5
COP (system)	1.47	1.47	1.47	1.46	1.48
						Capacity (kw/m 2)	976	969	978	980	961
Temperature glide in the vaporizer (℃)	0.61	0.50	0.65	0.69	0.34
						Temperature glide in the condenser (℃)	0.64	0.56	0.69	0.73	0.41

Example 3

Use NIST circulation D program under typical cryogenic refrigeration condition, to determine the numerical value of R125, R143a and R600a mixture.

Output cooling load 10kW

Vaporizer

Mid point fluid condensing temperature-30 ℃

Overheated 5.0 ℃

1.5 ℃ of suction line pressure drops (in the temperature of saturation)

Condenser

35.0 ℃ of mid point fluid condensing temperatures

Cross cold 5.0 ℃

1.5 ℃ of vent line pressure drops (in the temperature of saturation)

Liquid line/suction line heat exchanger

Efficient 0.3

Compressor

Compressor isentropic efficiency 0.7

Compressor volume efficient 0.82

Parasitic power

Evaporator fan 0.3kW

Condenser fan 0.4kW

Controller 0.1kW

Use the performance of above-mentioned operating condition analysis in unit cooler, the result is as shown in table 4.

Table 4

Refrigeration agent	1	2	3	4	5	6	7
								% by weight 125	71	72	75	75	78	79.5	79
% by weight 143a	27	26.5	22.5	23	20	18	18
								% by weight 600a	2	1.5	2.5	2	2	2.5	3
Blowdown presssure (bar)	17.21	17.32	17.20	17.30	17.3	17.31	17.20
								Exhaust temperature (℃)	80.5	80.4	79.7	79.8	79.9	79.0	79.0
COP (system)	1.49	1.49	1.49	1.49	1.48	1.48	1.48
								Capacity (kw/m 2)	926	930	921	926	925	922	917
Temperature glide in the vaporizer (℃)	0.28	0.20	0.38	0.28	0.28	0.4	0.48
								Temperature glide in the condenser (℃)	0.45	0.34	0.57	0.45	0.45	0.6	0.69

Example 4

Use NIST ' circulation D program under typical cryogenic refrigeration condition, to determine the numerical value of R125, R143a and R600 mixture.

Output cooling load 10kW

Vaporizer

Mid point fluid condensing temperature-30 ℃

Overheated 5.0 ℃

1.5 ℃ of suction line pressure drops (in the temperature of saturation)

Condenser

35.0 ℃ of mid point fluid condensing temperatures

Cross cold 5.0 ℃

1.5 ℃ of vent line pressure drops (in the temperature of saturation)

Liquid line/suction line heat exchanger

Efficient 0.3

Compressor

Compressor isentropic efficiency 0.7

Compressor volume efficient 0.82

Parasitic power

Evaporator fan 0.3kW

Condenser fan 0.4kW

Controller 0.1kW

Use the performance of above-mentioned operating condition analysis in unit cooler, the result is as shown in table 5.

Table 5

Refrigeration agent	1	2	3	4	5
						% by weight 125	72	74	75.5	77	80
% by weight 143a	26.5	23.5	23	21	17
						% by weight 600	1.5	2.5	1.5	2	3
Blowdown presssure (bar)	1706	1674	1713	1698	1668
						Exhaust temperature (℃)	81.1	81.1	80.5	80.4	80.3
COP (system)	1.49	1.49	1.49	1.49	1.49
						Capacity (kw/m 2)	912	891	913	902	879
Temperature glide in the vaporizer (℃)	1.02	1.80	1.03	1.41	2.28
						Temperature glide in the condenser (℃)	0.96	1.63	0.97	1.31	2.02

Example 5

Use NIST circulation D program under typical cryogenic refrigeration condition, to determine the numerical value of R125, R143a, R600a and R600 mixture.

Output cooling load 10kW

Vaporizer

Mid point fluid condensing temperature-30 ℃

Overheated 5.0 ℃

1.5 ℃ of suction line pressure drops (in the temperature of saturation)

Condenser

35.0 ℃ of mid point fluid condensing temperatures

Cross cold 5.0 ℃

1.5 ℃ of vent line pressure drops (in the temperature of saturation)

Liquid line/suction line heat exchanger

Efficient 0.3

Compressor

Compressor isentropic efficiency 0.7

Compressor volume efficient 0.82

Parasitic power

Evaporator fan 0.3kW

Condenser fan 0.4kW

Controller 0.1kW

Use the performance of above-mentioned operating condition analysis in unit cooler, the result is as shown in table 6.

Table 6

Refrigeration agent	1	2	3	4	5
						% by weight 125	72.4	74.5	77	79.5	81
% by weight 143a	25	22.5	20	17.5	17
						% by weight 600a	2	2.5	2	1.5	1
% by weight 600	0.6	0.5	1	1.5	1
						Blowdown presssure (bar)	17.02	17.01	16.97	16.94	17.26
Exhaust temperature (℃)	80.4	80.0	79.8	79.6	79.3
						COP (system)	1.49	1.49	1.49	1.49	1.48
Capacity (kw/m 2)	913	910	904	898	915
						Temperature glide in the vaporizer (℃)	0.74	0.76	1.07	1.38	0.86
Temperature glide in the condenser (℃)	0.84	0.91	1.13	9.36	0.89

Example 6

Use NIST circulation D program under typical cryogenic refrigeration condition, to determine the numerical value of R22 and R502 mixture, with it preceding example contrast.

Output refrigeration work consumption 10kW

Vaporizer

Mid point fluid condensing temperature-30 ℃

Overheated 5.0 ℃

1.5 ℃ of suction line pressure drops (in the temperature of saturation)

Condenser

35.0 ℃ of mid point fluid condensing temperatures

Cross cold 5.0 ℃

1.5 ℃ of vent line pressure drops (in the temperature of saturation)

Liquid line/suction line heat exchanger

Efficient 0.3

Compressor

Compressor isentropic efficiency 0.7

Compressor volume efficient 0.82

Parasitic power

Evaporator fan 0.3kW

Condenser fan 0.4kW

Controller 0.1kW

Use the performance of above-mentioned operating condition analysis in unit cooler, the result is as shown in table 7.

Table 7

Refrigeration agent	R22	R50
			Blowdown presssure (bar)	14.07	15.46
Exhaust temperature (℃)	132.4	93.5
			COP (system)	1.60	25.55
Capacity (kw/m 2)	872	907
			Temperature glide in the vaporizer (℃)	0	0.12
Temperature glide in the condenser (℃)	0	0

Example 7

Use NIST circulation D program in open compressor, under typical cryogenic refrigeration condition, to determine the numerical value of R125, R143a, R290 and R600a mixture.

Output cooling load 10kW

Vaporizer

35 ℃ of mid point fluid condensing temperatures

Overheated 5.0 ℃

1.5 ℃ of suction line pressure drops (in the temperature of saturation)

Condenser

35.0 ℃ of mid point fluid condensing temperatures

Cross cold 5.0 ℃

1.5 ℃ of vent line pressure drops (in the temperature of saturation)

Liquid line/suction line heat exchanger

Efficient 0.3

Compressor

Compressor isentropic efficiency 0.7

Compressor volume efficient 0.82

Parasitic power

Evaporator fan 0.3kW

Condenser fan 0.4kW

Controller 0.1kW

Use the performance of above-mentioned operating condition analysis in unit cooler, the result is as shown in table 8.

Table 8

Refrigeration agent	1	2	3	4	5	6	R22	R502
									% by weight 125	77.5	76	77	78	79	80
% by weight 143a	20	21.5	50.5	19.5	18.4	17.3
									% by weight 600a	1.9	1.8	1.8	1.9	2	2.1
% by weight 290	0.6	0.7	0.7	0.6	0.6	0.6
									Blowdown presssure (bar)	17.59	17.62	17.58	17.60	17.60	17.61	14.07	15.46
Exhaust temperature (℃)	84.2	84.1	83.9	83.8	83.6	83.4	142.7	99.5
									COP (system)	1.33	1.33	1.33	1.33	1.33	1.33	1.44	1.40

Capacity (kw/m 2)	1238	1239	1235	1236	1235	1234	1115	1177
									Temperature glide in the vaporizer (℃)	0.46	0.46	0.45	0.45	0.47	0.48	0	0.14
Temperature glide in the condenser (℃)	0.67	0.67	0.66	0.67	0.69	0.72	0	0.01

Claims (7)

1. a refrigerant composition mainly is comprised of following by weight:

R125 62 to 84.4%

R143a 15 to 30%

And the mixture of 0.1 to 5% 2-methylpropane and 0.1% to 5% propane.

2. refrigerant composition as claimed in claim 1, it mainly comprises by weight:

3. refrigerant composition as claimed in claim 1, it mainly comprises by weight:

4. refrigerant composition as claimed in claim 1, it mainly comprises by weight:

5. refrigerant composition as claimed in claim 1, it mainly comprises by weight:

6. refrigerant composition as claimed in claim 1, it mainly comprises by weight:

7. such as the described refrigerant composition of the arbitrary claim in front, itself and mineral oil or alkylbenzene

Oil, synthesized hydrocarbon fluid agent or the synthetic oxygen lubricant that contains together are used in the unit cooler.