CN115746792A - Environment-friendly heat transfer working medium matched with constant-temperature and constant-humidity air conditioning system - Google Patents
Environment-friendly heat transfer working medium matched with constant-temperature and constant-humidity air conditioning system Download PDFInfo
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- 238000012546 transfer Methods 0.000 title claims abstract description 32
- 238000004378 air conditioning Methods 0.000 title claims abstract description 29
- FFTOUVYEKNGDCM-OWOJBTEDSA-N (e)-1,3,3-trifluoroprop-1-ene Chemical compound F\C=C\C(F)F FFTOUVYEKNGDCM-OWOJBTEDSA-N 0.000 claims abstract description 22
- VPAYJEUHKVESSD-UHFFFAOYSA-N trifluoroiodomethane Chemical compound FC(F)(F)I VPAYJEUHKVESSD-UHFFFAOYSA-N 0.000 claims abstract description 21
- UHCBBWUQDAVSMS-UHFFFAOYSA-N fluoroethane Chemical compound CCF UHCBBWUQDAVSMS-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000005057 refrigeration Methods 0.000 claims abstract description 18
- 238000007906 compression Methods 0.000 claims abstract description 13
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 6
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- CDOOAUSHHFGWSA-OWOJBTEDSA-N (e)-1,3,3,3-tetrafluoroprop-1-ene Chemical compound F\C=C\C(F)(F)F CDOOAUSHHFGWSA-OWOJBTEDSA-N 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 58
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- QCMKXHXKNIOBBC-UHFFFAOYSA-N 3-fluoroprop-1-ene Chemical compound FCC=C QCMKXHXKNIOBBC-UHFFFAOYSA-N 0.000 claims 1
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- 238000009835 boiling Methods 0.000 description 4
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- 230000001105 regulatory effect Effects 0.000 description 2
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- LVGUZGTVOIAKKC-UHFFFAOYSA-N 1,1,1,2-tetrafluoroethane Chemical compound FCC(F)(F)F LVGUZGTVOIAKKC-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention belongs to the field of environmental temperature and humidity precise regulation, discloses an environment-friendly heat transfer working medium matched with a constant-temperature and constant-humidity air conditioning system, and provides a working medium containing 3, 3-trifluoropropene (CH) 2 ＝CHCF 3 ) Monofluoroethane (CH) 3 CH 2 F) And trifluoroiodomethane (CF) 3 I) Three components, and further mixing with performance regulator, wherein the performance regulator is 1, 2-tetrafluoroethane (CHF) 2 CHF 2 ) Trans-1,3,3,3-tetrafluoropropene (trans-CHF = CHCF) 3 ) And hexafluoropropylene (CF) 3 ＝CF 3 ) The quaternary mixed heat transfer working medium has excellent comprehensive performance, replaces a high-temperature chamber effect working medium commonly used by the existing air conditioner, and is specially used in a constant-temperature and constant-humidity air conditioning unit. Compared with R134a and R410A which are widely used in the current common air conditioner, the GWP value of the invention is greatly reduced, the invention is very suitable for the development strategy of 'double carbon', the operating pressure is equivalent to that of R134a, the basic requirement of a 'direct pouring type alternative' working medium substitution method is met, and the invention has compatibilityThe technical advantages of the current R134a system component assembly, namely the refrigeration cycle performance coefficient is higher than that of R134a and R410A, the energy-saving significance is remarkable, the exhaust temperature is not high, and the positive significance is realized on the optimization of the compression process.
Description
Technical Field
The invention belongs to the field of environmental temperature and humidity precise adjustment, relates to an environment-friendly heat transfer working medium matched with a constant-temperature and constant-humidity air conditioning system, and particularly relates to a mixed heat transfer working medium matched with a vapor compression refrigeration cycle.
Background
The nobel physics awards hasselman and true panzerls in 2021, manifesting its "physical modeling of the earth's climate to quantify variability and reliably predict global warming". The global warming problem has become more serious and widely focused at home and abroad, and is generally considered to be related to human activities and greenhouse gas emission at present. In order to realize sustainable development, in 12 months in 2015, the climate change of 21 st united nations passes Paris protocol, establishes international coping climate change mechanism arrangement taking the objective of national autonomous contribution as the main body after 2020, and each party makes a promise of controlling the global average temperature to be increased to a level lower than 2 ℃ and strives for a 1.5 ℃ temperature control objective. In 2016, the 28 th treaty of the Montreal protocol, passed on the Bulgarian amendments, the 18 Hydrofluorocarbons (HFCs) were included in the regulatory domain and specified a specific phase-out schedule. In 2021, 6 months, the book was officially submitted by the "Bulgarian amendments" of the Chinese government. Since 2024, the production and usage of HFCs for controlled use in our country will be frozen at baseline levels, with a 10% reduction in 2029, a 30% reduction in 2035, a 50% reduction in 2040, and no more than 20% baseline predicted in 2045.
Many HFCs are widely used in Heating Ventilation and Air Conditioning (HVAC) applications because of their ozone depletion potential, excellent thermal properties, wide sources, and good safety and applicability. HFCs are the main substitute of ozone layer destroying substances and contribute significantly to the protection of the ozone layer. In particular, R134a (CF) 3 CH 2 F) And R410A (CF) 2 H 2 And CF 3 CF 2 H equal mass ratio mixtures) are currently being widely used in a variety of refrigeration heat pumps and air conditioning devices. However, the greenhouse effect potential (GWP) of R410A and R134a, respectively, is CO 2 2088 times and 1360 times (in terms of 100 years). From sustainable development of energy and technology in the context of "dual carbonIn view of the above, it is necessary to research new environment-friendly heat transfer working media.
The main products of the unit of application of the invention are a cooling tower and a constant temperature and humidity air conditioner, and the unit of application of the invention comprises a plurality of products which take R410A and R134a as heat transfer working media. The constant temperature and humidity air conditioner is an important environment temperature and humidity precise regulation and control device, and is mainly used in occasions with strict requirements on indoor environment temperature, humidity fluctuation and regional deviation, such as electronic component production workshops, biological culture devices, medical clean rooms, data center machine rooms, high-grade storerooms, laboratories and the like. Compared with the conventional vehicle-mounted air conditioner and the household air conditioner, the constant-temperature and constant-humidity air conditioner has higher control precision requirement. The common constant temperature and humidity air conditioner can simultaneously or independently keep the temperature fluctuation +/-1 ℃ to +/-0.5 ℃ and the humidity fluctuation +/-5% to +/-2% in the regulated and controlled closed area; the high-precision constant-temperature and constant-humidity air conditioner can simultaneously or independently keep the temperature +/-0.5- +/-0.3 ℃ and the humidity +/-2%; the temperature adjusting precision of part of the ultrahigh-end unit can reach +/-0.1 ℃.
The inventor analyzes and considers that: firstly, compare in the required complicated external environment condition that faces of heat pump air conditioner commonly used, especially the evaporation temperature that is very low when showing humiture fluctuation and severe winter, the evaporation temperature when constant temperature and humidity air conditioner operation generally is higher than the zero degree, and the operating mode is undulant the interval less moreover, and this can provide bigger choice for novel meticulous screening and the multi-factor comprehensive balance consideration that matches environmental protection heat transfer working medium.
Secondly, in order to meet the requirements of stability and accuracy of the outlet air temperature of the constant temperature and humidity air conditioning unit, a heat compensation design is usually adopted. In consideration of the problem of high energy consumption caused by the electric heating method, a reheater is usually designed for the constant temperature and humidity air conditioning unit, so that the problems of split flow (non-equal split) and re-confluence of the working medium are involved. If the gas-liquid phase relation among the components of the used mixed working medium is not considered, the actual working performance of the unit can be seriously influenced.
Thirdly, the condensation heat of the conventional air conditioner is directly released to the environment, but the constant temperature and humidity air conditioner usually recycles part of the condensation heat, and the devices through which the heat transfer working medium passes and the total flow path are increased, so the heat exchange capacity and the flow transport property at medium and high temperatures need to be considered in a detailed manner.
Fourthly, the air conditioner is obviously different from a household air conditioner in that a user of the constant temperature and humidity air conditioner is an enterprise. On the one hand, the greenhouse effect value of the working medium may affect the carbon emission index of the usage unit; on the other hand, the constant temperature and humidity unit usually runs continuously for a long time, and the influence which cannot be ignored is revealed after long-term accumulation no matter the overall energy efficiency level is considered from the economical point of view or from the carbon emission point of view.
Fifthly, considering from the angle of the working occasion of the constant temperature and humidity air conditioner, once working medium leakage occurs, the performance and the operation stability of the unit are influenced, and disaster influence on precision devices and a high-cleanness production process is possibly caused. In order to reduce the occurrence probability of leakage, in addition to strengthening the sealing performance of the air conditioning unit, a corresponding optimization strategy should be developed from the viewpoint of the physicochemical properties of the working medium.
In conclusion, the invention provides an environment-friendly heat transfer working medium specially matched with a constant-temperature and constant-humidity air conditioning system based on earlier-stage research.
Disclosure of Invention
In response to the deficiencies and needs in the art, the present invention provides compositions comprising 3, 3-trifluoropropene (CH) 2 ＝CHCF 3 ) Monofluoroethane (CH) 3 CH 2 F) And trifluoroiodomethane (CF) 3 I) And a performance regulator is further required to be mixed, so that a quaternary mixed type heat transfer working medium with excellent comprehensive performance is formed, the working medium replaces a high-temperature chamber effect working medium commonly used by the existing air conditioner, and the working medium is specially used in a constant-temperature and constant-humidity air conditioning unit.
In order to achieve the purpose, the invention adopts the technical scheme that:
an environment-friendly heat transfer working medium matched with a constant-temperature and constant-humidity air conditioning system is prepared from a mixed heat transfer working medium which comprises 3, 3-trifluoropropene (a first component), monofluoroethane (a second component), trifluoroiodomethane (a third component) and a performance regulator through mixing according to the mass ratio of the components by using a conventional physical mixing method. The first component 3,3-trifluoropropene accounts for 20-80% of the total mass of the mixture, monofluoroethane accounts for 8.0-30.0% of the total mass of the mixture, and trifluoroiodomethane accounts for 10-40% of the total mass of the mixture. The property modifier is 1, 2-tetrafluoroethane (CHF) 2 CHF 2 ) Trans-1,3,3,3-tetrafluoropropene (trans-CHF = CHCF) 3 ) And hexafluoropropylene (CF) 3 ＝CF 3 ) According to the requirements of different specific constant-temperature and constant-humidity air conditioning units, different performance regulators are selected, and the performance regulators account for 2.0-10.0% of the total mass of the mixture.
The key physicochemical properties of the 3, 3-trifluoropropene, monofluoroethane, trifluoroiodomethane, 1, 2-tetrafluoroethane, trans-1, 3-tetrafluoropropene, and hexafluoropropene are shown in table 1:
TABLE 1 important physicochemical Properties of several substances
The development of heat transfer working medium of air conditioning system has already entered into the stage of solving the global warming problem, namely the substitute takes hydrofluorocarbon substances R410A, R134A, R404A, etc. as the representative; rather than the ozone depletion problem that has been addressed today as generally addressed in the previous stage of research, namely the last stage of replacement is represented by hydrochlorofluorocarbons R22, R142 b. Therefore, the design idea of the research and development technical scheme of the novel environment-friendly heat transfer working medium also needs to be developed therewith. The current main solution is to comprehensively consider the basic thermophysical property, the environmental influence, the safety risk and the cycle performance when the working medium is applied to the refrigerating and air-conditioning system, as well as the cost and the energy efficiency, and to research and develop the working medium according to the characteristics of the specific refrigerating and air-conditioning system and the operating condition thereof. The invention provides an environment-friendly heat transfer working medium matched with a constant-temperature and constant-humidity air conditioning system, which is designed for the working characteristics of the constant-temperature and constant-humidity air conditioning system, is based on three main components forming performance complementation with each other, and is additionally provided with a performance regulator to strengthen performance or expand the application range.
The action analysis of the first, second and third main components and the performance regulator is as follows: the first component 3, 3-trifluoropropene is HFOs (fluoroolefin) substances, is one of new-generation environment-friendly artificially synthesized heat transmitters, does not destroy the ozone layer, has extremely low potential value of greenhouse effect, is very close to the standard boiling point temperature of R134a, has working pressure very close to R134a under the same temperature condition, has excellent comprehensive thermodynamic property, and is considered to have better development potential in the field of HVAC. The present invention uses 3, 3-trifluoropropene as the first component in consideration of the operating conditions of the thermostatic and humidistatic air conditioning system. The second component of monofluoroethane is added to strengthen the heat exchange capability of the mixed working medium at lower temperature and the short-term compatibility of lubricating oil with lower cost, and the monofluoroethane is HFCs which is not limited by the Bulgarian amendments. The results of previous tests show that the mixture of the first component and the second component has flammability, and a flame retardant needs to be added to reduce the explosion risk. The invention adds trifluoroiodomethane with high flame-retardant efficiency, small greenhouse effect and proper thermal physical property as a third component. Finally, in order to further adjust the comprehensive performance of the mixed working medium to meet the operation requirements of the constant temperature and humidity air conditioner under various working conditions, the performance regulator 1, 2-tetrafluoroethane, trans-1, 3-tetrafluoropropene or hexafluoropropylene is added. <xnotran> , 1,1,2,2- 1,1,2,2- R134a (1,1,1,2- ) , : </xnotran> One is that 1,1, 2-tetrafluoroethane has a greenhouse effect value about 20% lower than that of R134 a; secondly, 1, 2-tetrafluoroethane has flame retardant capability; and thirdly, the normal boiling point temperature is closer to that of R13I1 which plays a flame retardant effect in the main component (compared with the substitute R134 a). The trans-1, 3-tetrafluoropropene is selected as the regulator considering that it is in the same family as the first component and has a close boiling point, and it is said that the production capacity is planned to be expanded and the cost is expected to be further reduced. Finally, the hexafluoropropylene is selected as the regulator, so that the hexafluoropropylene and the first component have the same family, the environmental protection property and the flame pressing capability are outstanding, and the boiling point temperature is very suitable.
Compared with the prior art, the invention has the beneficial effects that:
(1) The GWP value (calculated by 100 years) of the novel heat transfer working medium suitable for the constant-temperature and constant-humidity air conditioning system is about 1.3-113.8, and compared with the R134a and R410A which are widely used at present, the GWP value of the novel heat transfer working medium has great reduction (99.9 percent can be reduced to the maximum), and the novel heat transfer working medium is very suitable for a double-carbon development strategy.
(2) The novel multi-element mixed working medium provided by the invention is composed of three main components and a performance adjusting component, the operating pressure of the novel multi-element mixed working medium is equivalent to that of R134a in a wider concentration proportioning interval, the basic requirements of a direct pouring type alternative working medium substitution method are met, and the novel multi-element mixed working medium has the technical advantage of being compatible with a part component of a current R134a system.
(3) The novel quaternary mixed heat transfer medium provided by the invention has the refrigeration cycle performance coefficient higher than that of R134a and R410A, and has remarkable energy-saving significance.
(4) The novel quaternary mixed heat transfer medium has the compression ratio lower than that of R134a and R410A, has low exhaust temperature and has positive significance for optimizing the compressor.
Detailed Description
In order to further refine the contents and characteristics of the present invention and to facilitate the understanding of the present invention by those skilled in the art, some specific examples of the present invention are given below. Unless otherwise specified, the experimental methods adopted by the invention are all conventional methods, and experimental equipment, materials, reagents and the like used in the experimental method can be obtained from commercial sources.
Specific example 1: the first component (3, 3-trifluoropropene) accounts for 20% of the total mass of the mixture, the second component (monofluoroethane) accounts for 30% of the total mass of the mixture, the third component (trifluoroiodomethane) accounts for 40% of the total mass of the mixture, and the fourth component (1, 2-tetrafluoroethane) accounts for 10% of the total mass of the mixture. The quaternary mixture of the conditioning agents 1, 2-tetrafluoroethane had a relative molecular mass of about 88.1g/mol, a critical temperature of about 102.7 ℃ and a critical pressure of about 4421.0kPa.
Specific example 2: the first component (3, 3-trifluoropropene) accounts for 80% of the total mass of the mixture, the second component (monofluoroethane) accounts for 8% of the total mass of the mixture, the third component (trifluoroiodomethane) accounts for 10% of the total mass of the mixture, and the fourth component (1, 2-tetrafluoroethane) accounts for 2% of the total mass of the mixture. The quaternary mixture of the conditioning agents 1, 2-tetrafluoroethane used had a relative molecular mass of about 93.5g/mol, a critical temperature of about 103.0 ℃ and a critical pressure of about 3745.0kPa.
Specific example 3: the first component (3, 3-trifluoropropene) accounts for 50% of the total mass of the mixture, the second component (monofluoroethane) accounts for 20% of the total mass of the mixture, the third component (trifluoroiodomethane) accounts for 25% of the total mass of the mixture, and the fourth component (1, 2-tetrafluoroethane) accounts for 5% of the total mass of the mixture. The quaternary mixture of conditioning agents 1, 2-tetrafluoroethane used had a relative molecular mass of about 89.8g/mol, a critical temperature of about 102.2 deg.C, and a critical pressure of about 4083.4kPa.
Specific example 4: the first component (3, 3-trifluoropropene) accounts for 20% of the total mass of the mixture, the second component (monofluoroethane) accounts for 30% of the total mass of the mixture, the third component (trifluoroiodomethane) accounts for 40% of the total mass of the mixture, and the fourth component (trans-1, 3-tetrafluoropropene) accounts for 10% of the total mass of the mixture. The quaternary mixture of conditioning agents 1, 3-tetrafluoropropene used had a relative molecular mass of about 88.9g/mol, a critical temperature of about 100.7 ℃ and a critical pressure of about 4304.5kPa.
Specific example 5: the first component (3, 3-trifluoropropene) accounts for 80% of the total mass of the mixture, the second component (monofluoroethane) accounts for 8% of the total mass of the mixture, the third component (trifluoroiodomethane) accounts for 10% of the total mass of the mixture, and the fourth component (trans-1, 3-tetrafluoropropene) accounts for 2% of the total mass of the mixture. The quaternary mixture of conditioning agents 1, 3-tetrafluoropropene used had a relative molecular mass of about 93.6g/mol, a critical temperature of about 102.7 ℃ and a critical pressure of about 3727.9kPa.
Specific example 6: the first component (3, 3-trifluoropropene) accounts for 50% of the total mass of the mixture, the second component (monofluoroethane) accounts for 20% of the total mass of the mixture, the third component (trifluoroiodomethane) accounts for 25% of the total mass of the mixture, and the fourth component (trans 1, 3-tetrafluoropropene) accounts for 5% of the total mass of the mixture. The quaternary mixture of conditioning agents 1, 3-tetrafluoropropene used had a relative molecular mass of about 90.2g/mol, a critical temperature of about 101.36 ℃ and a critical pressure of about 4034kPa.
Specific example 7: the first component (3, 3-trifluoropropene) accounts for 20% of the total mass of the mixture, the second component (monofluoroethane) accounts for 30% of the total mass of the mixture, the third component (trifluoroiodomethane) accounts for 40% of the total mass of the mixture, and the fourth component (hexafluoropropene) accounts for 10% of the total mass of the mixture. The quaternary mixture using the regulator hexafluoropropylene has a relative molecular mass of about 90.6g/mol, a critical temperature of about 99.1 deg.C, and a critical pressure of about 4271.3kPa.
Specific example 8: the first component (3, 3-trifluoropropene) accounts for 80% of the total mass of the mixture, the second component (monofluoroethane) accounts for 8% of the total mass of the mixture, the third component (trifluoroiodomethane) accounts for 10% of the total mass of the mixture, and the fourth component (hexafluoropropene) accounts for 2% of the total mass of the mixture. The relative molecular mass of the quaternary mixture using the regulator hexafluoropropylene is about 94.0g/mol, the critical temperature is about 102.4 ℃, and the critical pressure is about 3721.7kPa.
Specific example 9: the first component (3, 3-trifluoropropene) accounts for 50% of the total mass of the mixture, the second component (monofluoroethane) accounts for 20% of the total mass of the mixture, the third component (trifluoroiodomethane) accounts for 25% of the total mass of the mixture, and the fourth component (hexafluoropropene) accounts for 5% of the total mass of the mixture. The relative molecular mass of the quaternary mixture of the hexafluoropropylene serving as a regulator is about 91.1g/mol, the critical temperature is about 100.6 ℃, and the critical pressure is about 4017.6kPa.
The temperature and humidity regulation and control capacity of the constant temperature and humidity air conditioning system on the environment is mainly based on the refrigeration cycle characteristics of the unit. Establishing a single-stage vapor compression refrigeration theoretical circulation model, operating in a mode of isentropic compression and equal enthalpy values of working media before and after throttling, and comparing and analyzing the main technical performance difference of the specific embodiments 1-9 compared with R134a in a refrigeration system under the working conditions of 10 ℃ of evaporation temperature, 50 ℃ of condensation temperature, 20 ℃ of compressor suction temperature and 10 ℃ of condenser outlet supercooling temperature. Parameters of significant interest include: the coefficient of performance COP of the refrigeration cycle, the condensing pressure, the exhaust temperature, the refrigerating capacity per unit volume, and the compression ratio, and the comparison results are shown in Table 2.
Table 2 difference in refrigeration cycle performance of specific examples of the invention compared to R134a
The coefficient of performance COP of the refrigeration cycle of embodiments 1 to 9 of the present invention is generally slightly higher than that of R134a, which means that the refrigeration system using the novel mixture of the present invention has less power consumption and certain energy saving significance under the condition of satisfying the same refrigerating capacity requirement. The compression ratios of the embodiments 1 to 9 of the invention are all smaller than R134a (relatively-7.0% to-9.8%), which has positive significance for the optimization of the compressor. The difference between the discharge temperature of the compressor and the discharge temperature of the R134a is not significant (relatively minus 3.5 percent to plus 6.8 percent), the maximum absolute difference value is about 4 ℃, and additional work is not needed in the aspects of lubricating oil viscosity number selection and system overheating prevention treatment in the embodiments 1 to 9 of the invention. The condensation pressure of the embodiments 2, 3, 5, 6, 8 and 9 of the present invention is substantially equivalent to that of R134 a. The person skilled in the art can find out by a little analysis that the quaternary mixture proposed by the present invention can satisfy the basic requirement of 'direct pouring type substitution' of R134a in a wider concentration ratio range, which lays the pressure condition foundation for compatibly using the components in part of the original R134a units. Generally, working media with higher operating pressures have a greater cooling capacity per unit volume. In the embodiments 1,4 and 7 of the present invention, it is considered that in order to increase the refrigerating capacity per unit volume to reduce the volume of the working chamber of the compressor, the operation pressure can be appropriately increased to obtain a larger refrigerating capacity per unit volume when the pressure resistance of the refrigerating system allows. From the comparison results, it can be seen that, compared with R134a, the embodiments 1,4 and 7 of the present invention show larger increase of the cooling capacity per unit volume and better effect under the condition of the same increase ratio of the condensing pressure.
Establishing a single-stage vapor compression type refrigeration theoretical circulation model, operating in a mode of isentropic compression and equal enthalpy values of working media before and after throttling, and comparing and analyzing the main technical performance difference of the specific embodiments 1-9 compared with the R410A used for a refrigeration system under the working conditions of 10 ℃ of evaporation temperature, 50 ℃ of condensation temperature, 20 ℃ of compressor suction temperature and 10 ℃ of condenser outlet supercooling temperature. Parameters of significant interest include: the coefficient of performance COP of the refrigeration cycle, the condensing pressure, the exhaust temperature, the refrigerating capacity per unit volume, and the compression ratio, and the comparison results are shown in Table 3.
Table 3 differences in refrigeration cycle performance for specific examples of the invention compared to R410A
The cycle performance coefficient COP of the specific embodiments 1 to 9 of the invention is obviously higher than that of R410A (+ 8.9 to + 10.6%), which means that if the novel mixed working medium is used for replacing R410A, under the condition of meeting the same refrigerating capacity requirement, the power consumption of a refrigerating system is less, and the energy-saving significance is obvious. In the embodiments 1 to 9 of the present invention, the condensing pressure and the exhaust temperature of the compressor are both far lower than that of R410A, the condensing pressure is reduced by more than half, the maximum reduction range of the exhaust temperature can reach 20%, and the compression ratio is also reduced, which has wider requirements on temperature resistance and pressure resistance of the refrigeration cycle system equipment, and is convenient for material selection, preparation, cost reduction and design and implementation of risk reduction measures. It should be noted that, compared to R410A, the working pressure of embodiments 1 to 9 of the present invention is reduced under the above-mentioned working condition, which also causes a significant reduction in the cooling capacity per unit volume. Although the latter is less reduced than the former, it is prudent to consider that the novel mixed working fluid of the invention is not recommended to be directly used in the original R410A compressor.
On the basis of the working conditions, assuming that constant-temperature and constant-humidity air conditioners respectively taking embodiments 1 to 9, R134a and R410A of the invention as heat transfer media have the same refrigerating capacity, a comparison value of the theoretically required circulating capacity of the heat transfer media can be obtained by relying on the established single-stage vapor compression refrigeration theoretical circulating model. Further, the reduction of the equivalent greenhouse effect potential (GWP) can be obtained. The comparative analysis results are shown in Table 4. Compared with R134a and R410A, the specific embodiments 1-9 of the invention can maximally reduce the potential for greenhouse effect (GWP) by 99.9%, and the environmental protection effect of the invention is quite remarkable.
TABLE 4 GWP reducing ability of embodiments of the invention
The above embodiments 1 to 9 are intended to further refine the contents and features of the present invention, and are intended to facilitate those skilled in the art to better understand the present invention. The invention also provides a method for protecting the electronic device.
Claims (6)
1. An environment-friendly heat transfer working medium matched with a constant-temperature and constant-humidity air conditioning system is characterized in that the environment-friendly heat transfer working medium is a quaternary mixed type heat transfer working medium specially matched with a vapor compression type constant-temperature and constant-humidity air conditioning refrigeration cycle, and comprises a first component 3, 3-trifluoropropene, a second component monofluoroethane, a third component trifluoroiodomethane and a performance regulator, and is obtained by mixing according to the mass ratio of the components by using a conventional physical mixing method.
2. An environment-friendly heat transfer working medium matched with a constant-temperature constant-humidity air conditioning system is characterized in that the performance regulator is 1, 2-tetrafluoroethane CHF 2 CHF 2 Trans 1,3,3,3-tetrafluoropropene trans-CHF = CHCF 3 And hexafluoropropylene CF 3 ＝CF 3 One kind of (1).
3. The environment-friendly heat transfer working medium matched with the constant-temperature and constant-humidity air conditioning system as claimed in claim 1, wherein the first component 3, 3-trifluoropropene accounts for 20-80% of the total mass of the mixture.
4. The environment-friendly heat transfer working medium matched with the constant-temperature and constant-humidity air conditioning system as claimed in claim 1, wherein the second component monofluoroethane accounts for 8.0-30.0% of the total mass of the mixture.
5. The environment-friendly heat transfer working medium matched with the constant-temperature and constant-humidity air conditioning system as claimed in claim 1, wherein the third component of trifluoroiodomethane accounts for 10-40% of the total mass of the mixture.
6. The environment-friendly heat transfer working medium matched with the constant-temperature and constant-humidity air conditioning system as claimed in claim 1, wherein the performance regulator accounts for 2.0-10.0% of the total mass of the mixture.
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| CN114716975A (en) * | 2022-04-08 | 2022-07-08 | 大连理工大学 | Heat transfer working medium suitable for reverse Carnot circulation system |
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