CN114907817B

CN114907817B - Environment-friendly mixed refrigeration working medium, refrigerant and refrigeration system

Info

Publication number: CN114907817B
Application number: CN202210737095.XA
Authority: CN
Inventors: 张宗云; 曾婧; 宋美琪; 江世恒
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2023-11-10
Anticipated expiration: 2042-06-27
Also published as: CN114907817A

Abstract

The application provides an environment-friendly mixed refrigerant, a refrigerant and a refrigerating system. The environment-friendly mixed refrigeration working medium comprises the following components in percentage by mass: propane 1-42%; 1 to 67 percent of trifluoroiodomethane; 25-70% of cyclopropane. According to the application, through the synergistic effect of the components, compared with the R134a refrigeration working medium, the mixed working medium has lower GWP, the GWP is less than 50, and the environment-friendly advantage is obvious. The environment-friendly mixed refrigerant disclosed by the application has excellent thermodynamic performance, the refrigerating capacity Qv and the coefficient of performance COP of unit volume are close to or better than those of R134a, and the refrigerating cycle performance is better. In addition, the boiling point, critical temperature, critical pressure and operating pressure of the refrigerant are similar to those of R134a, and the refrigerant can be directly applied to the air conditioner refrigeration field on the premise of not changing main devices of the existing system, so that the refrigerant becomes an environment-friendly refrigerant for replacing R134a.

Description

Environment-friendly mixed refrigeration working medium, refrigerant and refrigeration system

Technical Field

The application relates to the technical field of refrigeration, in particular to an environment-friendly mixed refrigeration working medium, a refrigerant and a refrigeration system.

Background

With the increasing global warming, environmental protection is becoming more and more important, the chlorine-containing and hydrogen-free fluorocarbon CFCs in freons have the greatest environmental destruction, and the hydrogen-containing and chlorine-containing fluorocarbon HCFCs are inferior to each other, so that these freon gases are dissipated into the stratosphere, and due to the effect of ultraviolet rays, chlorine atoms decomposed from chlorofluorocarbons destroy the ozone layer, which results in the great enhancement of ultraviolet rays reaching the earth surface, damages the balance of biological environment, seriously affects the living environment of human beings, and needs to be eliminated.

R134a used in the current air conditioning system has good thermal performance, ODP (ozone potential value) is 0, but because GWP is 1430 and the GWP is in the controlled range of the basic plus modification, phase-out is already a necessary trend, so that it is urgent to find working media which meet the requirements of environmental protection and the energy efficiency of the air conditioning system. At present, from the point of view of single working medium and refrigerant composition, substitution research of novel low GWP value refrigerants is often carried out internationally, mainly including novel HFCs substitutes, hydrofluoroolefin (HFOs) substitutes and hydrocarbon refrigerant natural working media, and proper compositions are sought to meet the requirements of an air conditioning system on the refrigerants. The refrigerant compositions disclosed in the prior art have the defects of higher GWP or insufficient cycle performance, and the like, so that development of new refrigerants with better refrigeration performance, better compatibility with the existing systems and safer and more environment-friendly performance is needed.

Disclosure of Invention

The application mainly aims to provide an environment-friendly mixed refrigerant, a refrigerant and a refrigerating system, which are used for solving the problems of high GWP and insufficient refrigeration cycle performance of the refrigerant in the prior art.

In order to achieve the above object, according to one aspect of the present application, there is provided an environment-friendly mixed refrigerant comprising, in mass percent: propane 1-42%; 1 to 67 percent of trifluoroiodomethane; 25-70% of cyclopropane.

Further, the environment-friendly mixed refrigerant comprises the following components in percentage by mass: propane 1-14%; 31-67% of trifluoroiodomethane; 32-68% of cyclopropane.

Further, the environment-friendly mixed refrigerant comprises the following components in percentage by mass: propane 1-8%; 52-67% of trifluoroiodomethane; 25-40% of cyclopropane; and the GWP of the environment-friendly mixed refrigerant is less than or equal to 36.

Further, the environment-friendly mixed refrigerant comprises the following components in percentage by mass: propane 1-14%; 31-58% of trifluoroiodomethane; 36-55% of cyclopropane; the relative coefficient of performance of the environment-friendly mixed refrigerant is more than or equal to 1.012, and is the ratio of the coefficient of performance of the environment-friendly mixed refrigerant and the coefficient of performance of 1, 2-tetrafluoroethane.

Further, the environment-friendly mixed refrigerant comprises 6% of propane, 39% of trifluoroiodomethane and 55% of cyclopropane by mass percent; or the environment-friendly mixed refrigerant comprises 14% of propane, 31% of trifluoroiodomethane and 55% of cyclopropane; or the environment-friendly mixed refrigerant comprises 36% of propane, 13% of trifluoroiodomethane and 51% of cyclopropane.

According to another aspect of the present application, there is provided a refrigerant comprising the environmentally friendly mixed refrigerant of the present application.

Further, the refrigerant also comprises any one or more of solubilizer, lubricant and dispersing agent.

Further, the lubricant is selected from any one or more of mineral oil, silicone oil and polyol ester.

According to another aspect of the present application there is provided a refrigeration system comprising a compressor, a condenser, an evaporator, a throttling element, the compressor, condenser, evaporator, throttling element being connected by a closed loop having the refrigerant of the present application therein.

Further, the refrigeration system is an air conditioning system.

By applying the technical scheme of the application, the mixed working medium has lower GWP (global warming potential) than R134a refrigeration working medium by the synergistic effect of the components, and has obvious environmental protection advantage, wherein the GWP is less than 50. The environment-friendly mixed refrigerant disclosed by the application has excellent thermodynamic performance, the refrigerating capacity Qv and the coefficient of performance COP of unit volume are close to or better than those of R134a, and the refrigerating cycle performance is better. In addition, the boiling point, critical temperature, critical pressure and operating pressure of the refrigerant are similar to those of R134a, and the refrigerant can be directly applied to the air conditioner refrigeration field on the premise of not changing main devices of the existing system, so that the refrigerant becomes an environment-friendly refrigerant for replacing R134a.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 illustrates a compression refrigeration cycle system diagram of the present application;

wherein the above figures include the following reference numerals:

1. a compressor; 2. a condenser; 3. an evaporator; 4. a throttling element.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

Term interpretation:

r134a:1, 2-tetrafluoroethane.

Refrigerating capacity Qv per unit volume: refrigerating capacity generated when a unit volume of refrigerant flows in the refrigerating system.

Coefficient of performance COP: the cooling capacity obtained by unit power consumption.

Operating pressure: evaporation pressure and condensation pressure.

Compression ratio: the ratio of the evaporation pressure to the condensation pressure.

Slip temperature: the difference between the bubble point temperature and the dew point temperature corresponding to 0.1 MPa.

As described in the background art of the application, the prior art has the problems of higher GWP and insufficient refrigeration cycle performance of the refrigerant. In order to solve the above problems, in an exemplary embodiment of the present application, there is provided an environment-friendly mixed refrigerant, including, in mass percent: propane 1-42%; 1 to 67 percent of trifluoroiodomethane; 25-70% of cyclopropane.

Through the synergistic effect between the energy efficiency of each capacity of the refrigerating working medium of the components and the components with different GWP values, the mixed working medium has lower GWP (global warming potential) than the existing R134a refrigerating working medium, has the GWP of <300, and has obvious environmental protection advantage. The environment-friendly mixed refrigerant disclosed by the application has excellent thermodynamic performance, the refrigerating capacity Qv and the coefficient of performance COP of unit volume are close to or better than those of R134a, and the refrigerating cycle performance is better. In addition, the boiling point, critical temperature, critical pressure and operating pressure of the refrigerant are similar to those of R134a, and the refrigerant can be directly applied to the air conditioner refrigeration field on the premise of not changing main devices of the existing system, so that the refrigerant becomes an environment-friendly refrigerant for replacing R134a. In addition, the molecular mass of the mixed refrigerant is smaller than R134a, the fluidity is good, and the service life of the compressor is prolonged; the sliding temperature is small, and adverse effects caused by temperature sliding can be eliminated; compression ratios lower than R134a may reduce compressor power consumption and may be beneficial for long term operation of the compressor.

In a preferred embodiment, the environment-friendly mixed refrigerant comprises, in mass percent: propane 1-14%; 31-67% of trifluoroiodomethane; 32-68% of cyclopropane. When the mass percentages of the three components contained in the refrigerant composition are respectively in the ranges, the refrigerant composition has lower GWP, has GWP of less than 50, has advantages in the aspect of low carbon and environmental protection, and has better thermodynamic cycle performance.

Preferably, the environment-friendly mixed refrigerant comprises the following components in percentage by mass: propane 1-8%; 52-67% of trifluoroiodomethane; 25-40% of cyclopropane; the trifluoroiodomethane has smaller GWP, and the GWP of the environment-friendly mixed refrigerant with the composition is less than or equal to 36. When the mass percentages of the three components contained in the refrigerant composition are respectively in the ranges, the GWP is less than 50, and the refrigerant composition also has higher coefficient of performance COP and excellent cycle performance.

Preferably, the environment-friendly mixed refrigerant comprises the following components in percentage by mass: propane 1-14%; 31-58% of trifluoroiodomethane; 36-55% of cyclopropane; the cyclopropane has smaller molecular weight, the relative coefficient of performance of the environment-friendly mixed refrigerant with the composition is more than or equal to 1.012, and the relative coefficient of performance is the ratio of the coefficient of performance of the environment-friendly mixed refrigerant and the coefficient of performance of 1, 2-tetrafluoroethane.

In some embodiments, the environmentally friendly mixed refrigerant comprises, in mass percent, 6% propane, 39% trifluoroiodomethane and 55% cyclopropane; or the environment-friendly mixed refrigerant comprises 14% of propane, 31% of trifluoroiodomethane and 55% of cyclopropane; or the environment-friendly mixed refrigerant comprises 36% of propane, 13% of trifluoroiodomethane and 51% of cyclopropane, and has better comprehensive performance.

In yet another exemplary embodiment of the present application, a refrigerant is also provided, including the environmentally friendly mixed refrigerant of the present application, having a lower GWP value and good refrigeration cycle performance.

In order to improve the fluidity of the refrigerant and the applicability of the system, in a preferred embodiment, the refrigerant further comprises any one or more of a lubricant, a solubilizing agent and a dispersing agent. There is no particular limitation on the kind of lubricant, and lubricants commonly used in the art are suitable for the present application. In a preferred embodiment, the lubricant is selected from any one or more of mineral oil, silicone oil, polyol ester.

In yet another exemplary embodiment of the present application, there is also provided a refrigeration system, as shown in fig. 1, comprising a compressor 1, a condenser 2, an evaporator 3, a throttling element 4, wherein the compressor 1, the condenser 2, the evaporator 3, the throttling element 4 are connected by a closed circuit, the closed circuit having the refrigerant of the present application therein. The low-pressure mixed refrigerant (refrigerant) exchanges heat between the evaporator 3 and indoor air to release cold energy, then the low-pressure gaseous refrigerant enters the compressor 1 to be compressed into a high-temperature high-pressure gaseous state, exchanges heat with outdoor air through the condenser 2 to release heat, condenses into a high-pressure liquid refrigerant, and throttles into a gas-liquid two-phase low-pressure refrigerant through the throttling element 4.

In a preferred embodiment, the refrigeration system is an air conditioning system, and the refrigerant of the present application can be used for the air conditioning system to directly replace the existing environment-friendly refrigerant of R134a.

The application is described in further detail below in connection with specific examples which are not to be construed as limiting the scope of the application as claimed.

The present application combines a refrigerant composition comprising propane (R290), trifluoroiodomethane (R13I 1) and cyclopropane (RC 270) as follows. Wherein the proportion of the components is mass percent, and the sum of the mass percent of the components of each refrigerant composition is 100 percent. When the combination mode is determined, the refrigerant components are physically mixed according to the corresponding mass ratio under the conditions of the temperature of 23-27 ℃ and the pressure of 0.1 MPa. The basic parameters of each component are shown in Table 1.

TABLE 1

Example 1

R290, R13I1 and RC270 were physically mixed at a mass percent of 1:58:41 in the liquid phase.

Example 2

R290, R13I1 and RC270 were physically mixed at a mass percent of 6:39:55 in the liquid phase.

Example 3

R290, R13I1 and RC270 were physically mixed at a mass percent of 6:58:36 in the liquid phase.

Example 4

R290, R13I1 and RC270 were physically mixed at a mass percent of 8:52:40 in the liquid phase.

Example 5

R290, R13I1 and RC270 were physically mixed in the liquid phase at a mass percent of 14:31:55.

Example 6

R290, R13I1 and RC270 were physically mixed at a mass percent of 8:67:25 in the liquid phase.

Example 7

R290, R13I1 and RC270 were physically mixed at a mass percent of 22:31:47 in the liquid phase.

Example 8

R290, R13I1 and RC270 were physically mixed at a mass percent of 24:6:70 in the liquid phase.

Example 9

R290, R13I1 and RC270 were physically mixed at a mass percent of 36:13:51 in the liquid phase.

Example 10

R290, R13I1 and RC270 were physically mixed at a mass percent of 42:2:56 in the liquid phase.

Comparative example 1

R290, R13I1 and RC270 were physically mixed in the liquid phase at a mass percent of 56:30:14.

Comparative example 2

R290, R13I1 and RC270 were physically mixed at a mass percent of 62:23:15 in the liquid phase.

Comparative example 3

The refrigerant is single R134a.

Comparative example 4

R290 and R13I1 were physically mixed in the liquid phase at a mass percent of 50:50.

Comparative example 5

R290 and RC270 were physically mixed at a mass percent of 50:50 in the liquid phase.

Comparative example 6

The R13I1 and RC270 were physically mixed at a mass percent of 50:50 in the liquid phase.

The performance parameters of the mixed refrigerant in examples 1 to 10 and comparative examples 1 to 6 are shown in table 2.

TABLE 2

As can be seen from table 2, the refrigerant provided in the embodiment of the application has lower GWP, the GWP is less than 50, and the GWP is less than 36 in the preferred range, so that the refrigerant has more obvious environmental protection advantage compared with R134a. Meanwhile, the molecular weight is smaller than that of R134a, so that the material has better fluidity and contributes to prolonging the service life of the compressor. The boiling point, critical temperature and critical pressure are similar to those of R134a, and can be used as long-term substitutes of R134a. In addition, the sliding temperature of the mixed refrigerant is smaller, and the sliding temperature of the listed embodiments is lower than 3 ℃, belongs to near-azeotropic mixtures, and eliminates adverse effects caused by temperature sliding.

The examples of the present application allow the above-described mixed working fluids to have lower GWP by synergistic action between the respective capacity energy efficiency of the refrigerant of a specific component and components having different GWP values, as compared with comparative examples 4 to 6.

The comparative results of the thermodynamic parameters (i.e., compression ratio and discharge temperature) and the relative thermodynamic properties (i.e., relative refrigerating capacity per unit volume and relative efficiency COP) of the above examples 1 to 10 and comparative examples 1 to 6 under the refrigerating conditions (i.e., evaporation temperature of 10 ℃, condensation temperature of 45 ℃, degree of superheat of 3 ℃, degree of supercooling of 7 ℃, and adiabatic efficiency of compressor of 0.7) are shown in table 3.

TABLE 3 Table 3

As can be seen from Table 3, the evaporating pressure and condensing pressure of the refrigerant in each embodiment of the application are similar to those of R134a, and the refrigerant can be directly used instead of R134a, and the compression ratio is lower than that of R134a, so that the power consumption of the compressor can be reduced and the refrigerant is beneficial to long-term operation of the compressor. And the coefficient of performance COP and the refrigerating capacity per unit volume of each embodiment are equal to or better than those of R134a, and the cycle performance is excellent. As can be seen from comparative examples 1 and 2, the coefficient of performance COP of the refrigerant is relatively low when the composition of the refrigerant is outside the ratio range of the present application.

Compared with comparative examples 4 to 6, the embodiment of the present application makes the above-mentioned mixed working medium refrigeration cycle performance better by the synergistic effect between the respective capacity energy efficiency of the refrigeration working medium of a specific component and the components having different GWP values.

In summary, under the working condition of a design system and in the preferred proportion range of theoretical calculation, the refrigerant provided by the application not only has the environment-friendly characteristics of low GWP value and zero ODP, but also has excellent thermal performance, the refrigerating capacity Qv and coefficient of performance COP of unit volume are close to or better than R134a, the operating pressure is close to R134a, and the refrigerant can be directly applied to the field of air conditioning refrigeration to become the environment-friendly refrigerant for replacing R134a.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. The environment-friendly mixed refrigerant is characterized by comprising, by mass, 6% of propane, 39% of trifluoroiodomethane and 55% of cyclopropane; or alternatively

The environment-friendly mixed refrigerant comprises 14% of propane, 31% of trifluoroiodomethane and 55% of cyclopropane; or alternatively

The environment-friendly mixed refrigerant comprises 36% of propane, 13% of trifluoroiodomethane and 51% of cyclopropane.

2. A refrigerant comprising a refrigerant medium, wherein the refrigerant medium is the environment-friendly mixed refrigerant medium of claim 1.

3. The refrigerant of claim 2, further comprising any one or more of a solubilizing agent, a lubricant, a dispersant.

4. A refrigerant according to claim 3, wherein the lubricant is selected from any one or more of mineral oil, silicone oil, polyol ester.

5. A refrigeration system comprising a compressor, a condenser, an evaporator, a throttling element, the compressor, the condenser, the evaporator, the throttling element being connected by a closed circuit having a refrigerant therein, wherein the refrigerant is the refrigerant of any of claims 2 to 4.

6. The refrigeration system of claim 5 wherein the refrigeration system is an air conditioning system.