CN112111249B - Mixed refrigerant, heat exchange system and household appliance - Google Patents
Mixed refrigerant, heat exchange system and household appliance Download PDFInfo
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- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
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Abstract
The invention provides a mixed refrigerant, a heat exchange system and a household appliance, wherein the mixed refrigerant comprises a first component, a second component and a third component, the first component is trifluoroiodomethane, the second component is at least one of 1, 1-difluoroethane, 3,3, 3-trifluoropropene and 2,3,3, 3-tetrafluoropropene, and the third component is ammonia. The mixed refrigerant is used for a dehumidification system for stepped temperature reduction, and a refrigeration dehumidification system using the mixed refrigerant has good environmental protection performance, has low GWP, and is equivalent to or even superior to COP of a traditional refrigeration dehumidification system of R134 a.
Description
Technical Field
The invention relates to the technical field of refrigerants, in particular to a mixed refrigerant, a heat exchange system and a household appliance.
Background
With the trend toward environmental protection becoming more serious, and with respect to the "greenhouse effect" of HFCs, the montreal protocol amendment requires a refrigerant having a low GWP (global warming potential) value without damaging the ozone layer to replace the current high GWP refrigerant, and is effectively applied to a refrigeration system. In the existing dehumidification system, most of the refrigerants used in the system are R134a (GWP: 1430), but at present, no perfect solution for replacing R134a has been found, and due to the characteristics of R134a, the refrigeration system using R134a has a low capacity per unit volume, so that the compressor has a large volume (large displacement), and finally the system COP (relative coefficient of performance) is low. Since the mixed refrigerant has the characteristic of balancing the physical properties of the refrigerant, the research on the mixed refrigerant becomes a hot spot of research of scholars and enterprises at home and abroad. To the dehumidification system who uses non-azeotropic mixture refrigerant, can realize the ladder cooling dehumidification, and then reduce the heat transfer loss of traditional dehumidification process by a wide margin, reduced the dehumidification energy consumption, promoted the advantage of dehumidification efficiency
Patent document CN109762526A discloses a mixed refrigerant replacing R134a, but the thermal performance of the replaced mixed refrigerant is only equivalent to R134a, even worse than R134 a. Patent document CN102676119A also proposes a low GWP refrigerant as a substitute for R134a refrigerant, and although this refrigerant has improved COP and capacity refrigeration compared with the mixed refrigerant of CN109762526A, some of the examples have inferior COP to R134 a.
Disclosure of Invention
The first purpose of the invention is to provide a mixed refrigerant for a stepped temperature reduction dehumidification system, and a refrigeration dehumidification system using the mixed refrigerant has good environmental protection performance, has low GWP, and is equivalent to or better than COP of a traditional refrigeration dehumidification system of R134 a.
The second purpose of the invention is to provide a heat exchange system adopting the mixed refrigerant.
A third object of the present invention is to provide a household appliance having the above heat exchange system.
In order to achieve the first object, the present invention provides a mixed refrigerant comprising a first component, a second component and a third component, wherein the first component is trifluoroiodomethane, the second component is at least one of 1, 1-difluoroethane, 3,3, 3-trifluoropropene, and 2,3,3, 3-tetrafluoropropene, and the third component is ammonia. In a preferred embodiment, the content of the first component is 50 to 75 wt%, the content of the second component is 20 to 40 wt%, and the content of the third component is 5 to 15 wt%.
In a further scheme, the second component is 1, 1-difluoroethane; the content of the first component is 60% to 70%, the content of the second component is 20% to 30%, and the content of the third component is 10% to 15%.
In a preferred embodiment, the second component is 3,3, 3-trifluoropropene; the content of the first component is 50% to 65%, the content of the second component is 20% to 30%, and the content of the third component is 10% to 15%.
In a further scheme, the content of the first component is 60%, the content of the second component is 25%, and the content of the third component is 15%.
In a preferred embodiment, the second component is 2,3,3, 3-tetrafluoropropene; the content of the first component is 50-75%, the content of the second component is 20-40%, and the content of the third component is 5-15%.
In a further scheme, the content of the first component is 50%, the content of the second component is 35%, and the content of the third component is 15%.
In order to achieve the second objective, the invention provides a heat exchange system, which adopts the mixed refrigerant.
One preferred scheme is that the heat exchange system is a stepped temperature reduction and dehumidification system.
In order to achieve the third object, the invention provides a household appliance comprising the heat exchange system.
The refrigerant mixture has the advantages that the GWP value of the refrigerant in the system is low, and the refrigerant mixture meets the requirement of environmental protection regulations in various regions all over the world. Not only the thermal performance is better than that of R134a under a proper proportion, but also the dehumidification efficiency of the system is higher than that of the traditional refrigeration dehumidification system. Trifluoroiodomethane is a non-flammable refrigerant, and can reduce or even eliminate the flammability of the flammable refrigerant when being mixed with the flammable refrigerant, thereby improving the safety of the system.
Drawings
FIG. 1 is a system block diagram of a stepped temperature reduction dehumidification system.
Fig. 2 is a system block diagram of a conventional dehumidification system.
The invention is further explained with reference to the drawings and the embodiments.
Detailed Description
Mixed refrigerant and heat exchange system embodiments
The heat exchange system of this embodiment is ladder cooling dehumidification system, adopts mixed refrigerant as heat transfer medium, and this mixed refrigerant exchanges heat in heat exchange system's unit, is compressed, the throttle, replaces R134a refrigerant.
The mixed refrigerant is used for a stepped temperature reduction and dehumidification system as shown in fig. 1, and the working principle is as follows: the high-temperature high-pressure mixed gaseous refrigerant discharged from the exhaust port of the compressor 1 enters the first condenser 4 for condensation, R13I1 (trifluoroiodomethane) with a higher boiling point is preferentially condensed into liquid, the gas-liquid mixture enters the first gas-liquid separator 2 for separation, and the liquid in the first gas-liquid separator 2 enters the first evaporator 9 for evaporation after being throttled by the first throttling valve 12. The mixed refrigerant gas from the first gas-liquid separator 2 enters a second condenser 5 for condensation, the second component refrigerant with the second boiling point is preferentially condensed into liquid, the gas-liquid mixture enters a second gas-liquid separator 3 for separation, and the liquid in the second gas-liquid separator 3 enters a second evaporator 8 for evaporation through throttling of a second throttling valve 11. The refrigerant gas from the second gas-liquid separator 3 enters a third condenser 6 for condensation, and the third component refrigerant condensed into liquid enters a third evaporator 7 for evaporation through a third throttling valve 10. For the air side, the air is cooled to be saturated wet air by the first evaporator 9, dehumidified by the second evaporator 8, and further dehumidified by the third evaporator 7 having a lower surface temperature, and compared with the conventional dehumidification system shown in fig. 2, the dehumidification efficiency can be improved.
The preparation method of the mixed refrigerant is that the first component, the second component and the third component are physically mixed into a ternary mixture according to the corresponding mass ratio under the normal temperature and pressure liquid phase state. Wherein the first component is trifluoroiodomethane, the second component is one of 1, 1-difluoroethane, trifluoropropene and 2,3,3, 3-tetrafluoropropene, and the third component is ammonia. The basic parameters of each component are shown in Table 1.
TABLE 1 basic parameters of the constituent substances in the mixed refrigerant
In accordance with the above-described method, a plurality of specific examples and comparative examples are given below, in which the proportions of substances are mass ratios and the sum of the mass percentages of the substances of each refrigerant is 100%. In each of the examples and comparative examples, the substances were physically mixed in a liquid phase at a constant mass ratio under normal temperature and pressure, and mixed uniformly to obtain a mixed refrigerant.
In example 1, three components of trifluoroiodomethane (R13I1), 1-difluoroethane (R152a) and ammonia (R717) are physically mixed in a mass ratio of 70:20:10 under normal temperature and pressure liquid phase, and an environment-friendly mixed refrigerant is obtained after uniform mixing.
In example 2, three components of trifluoroiodomethane (R13I1), 1-difluoroethane (R152a) and ammonia (R717) are physically mixed in a mass ratio of 60:30:10 under normal temperature and pressure liquid phase, and an environment-friendly mixed refrigerant is obtained after uniform mixing.
In example 3, three components of trifluoroiodomethane (R13I1), 1-difluoroethane (R152a) and ammonia (R717) are physically mixed at the normal temperature and pressure and in the mass ratio of 60:25:15, and an environment-friendly mixed refrigerant is obtained after uniform mixing.
In example 4, three components of trifluoroiodomethane (R13I1), 3,3, 3-trifluoropropene (R1243zf) and ammonia (R717) are physically mixed according to the mass ratio of 58:29:13 under normal temperature and pressure, and an environment-friendly mixed refrigerant is obtained after uniform mixing.
In example 5, three components of trifluoroiodomethane (R13I1), 3,3, 3-trifluoropropene (R1243zf) and ammonia (R717) are physically mixed at the normal temperature and pressure in a mass ratio of 65:20:15, and the mixture is uniformly mixed to obtain the environment-friendly mixed refrigerant.
In example 6, three components of trifluoroiodomethane (R13I1), 3,3, 3-trifluoropropene (R1243zf) and ammonia (R717) were physically mixed at a mass ratio of 60:25:15 at normal temperature and pressure, and an environmentally friendly mixed refrigerant was obtained after uniform mixing.
In example 7, three components of trifluoroiodomethane (R13I1), 2,3,3, 3-tetrafluoropropene (R1234yf) and ammonia (R717) were physically mixed at a mass ratio of 75:20:5 at normal temperature and pressure, and an environmentally friendly mixed refrigerant was obtained after uniform mixing.
In example 8, three components of trifluoroiodomethane (R13I1), 2,3,3, 3-tetrafluoropropene (R1234yf) and ammonia (R717) were physically mixed at a mass ratio of 50:40:10 under normal temperature and pressure, and an environmentally friendly mixed refrigerant was obtained after uniform mixing.
In example 9, three components of trifluoroiodomethane (R13I1), 2,3,3, 3-tetrafluoropropene (R1234yf) and ammonia (R717) were physically mixed at a mass ratio of 60:30:10 under normal temperature and pressure, and an environmentally friendly mixed refrigerant was obtained after uniform mixing.
In example 10, three components of trifluoroiodomethane (R13I1), 2,3,3, 3-tetrafluoropropene (R1234yf) and ammonia (R717) were physically mixed at a mass ratio of 50:35:15 at normal temperature and pressure, and an environmentally friendly mixed refrigerant was obtained after uniform mixing.
In comparative example 1, three components of trifluoroiodomethane (R13I1), 1-difluoroethane (R152a) and ammonia (R717) are physically mixed according to the mass ratio of 45:40:15 under normal temperature and normal pressure liquid phase, and the environment-friendly mixed refrigerant is obtained after uniform mixing.
In comparative example 2, three components of trifluoroiodomethane (R13I1), 1-difluoroethane (R152a) and ammonia (R717) are physically mixed according to the mass ratio of 70:15:15 under normal temperature and pressure and are uniformly mixed to obtain the environment-friendly mixed refrigerant.
In comparative example 3, three components of trifluoroiodomethane (R13I1), 1-difluoroethane (R152a) and ammonia (R717) are physically mixed according to the mass ratio of 60:20:20 under normal temperature and normal pressure liquid phase, and the environment-friendly mixed refrigerant is obtained after uniform mixing.
In comparative example 4, three components of trifluoroiodomethane (R13I1), trifluoropropene (R1243zf) and ammonia (R717) are physically mixed according to the mass ratio of 45:40:15 under normal temperature and pressure and are uniformly mixed to obtain the environment-friendly mixed refrigerant.
In the comparative example 5, three components of trifluoroiodomethane (R13I1), trifluoropropene (R1243zf) and ammonia (R717) are physically mixed according to the mass ratio of 70:15:15 under normal temperature and pressure and are uniformly mixed to obtain the environment-friendly mixed refrigerant.
In the comparative example 6, three components of trifluoroiodomethane (R13I1), trifluoropropene (R1243zf) and ammonia (R717) are physically mixed according to the mass ratio of 60:20:20 under normal temperature and pressure and are uniformly mixed to obtain the environment-friendly mixed refrigerant.
In comparative example 7, three components of trifluoroiodomethane (R13I1), 2,3,3, 3-tetrafluoropropene (R1234yf) and ammonia (R717) are physically mixed according to the mass ratio of 45:40:15 under normal temperature and pressure and are uniformly mixed to obtain the environment-friendly mixed refrigerant.
In the comparative example 8, three components of trifluoroiodomethane (R13I1), 2,3,3, 3-tetrafluoropropene (R1234yf) and ammonia (R717) are physically mixed according to the mass ratio of 70:15:15 under normal temperature and pressure and are uniformly mixed to obtain the environment-friendly mixed refrigerant.
In comparative example 9, three components of trifluoroiodomethane (R13I1), 2,3,3, 3-tetrafluoropropene (R1234yf) and ammonia (R717) are physically mixed according to the mass ratio of 60:20:20 under normal temperature and pressure and are uniformly mixed to obtain the environment-friendly mixed refrigerant.
Through simulation calculation, the circulation performances of the stepped temperature reduction dehumidification system and the traditional dehumidification system are calculated under the same air side condition, namely the inlet air dry bulb temperature is 27 ℃, the wet bulb temperature is 21.2 ℃, the simulation calculation is carried out according to the isentropic efficiency of 0.7, the comparison result of the refrigeration circulation performance of the refrigeration system loop obtained through calculation in the embodiment is shown in the table 2, and the comparison result of the embodiment and R134a relative thermal performance (namely relative unit volume refrigerating capacity and relative coefficient of performance COP) is shown in the table 3.
TABLE 2 comparison of the refrigeration cycle performance of the examples with R134a
As can be seen from Table 2, the environmental performance of the cascade cooling dehumidification system adopting the mixed refrigerant of the invention is far better than R134a, the thermal performance is better than R134a, and the GWP is lower than 150.
TABLE 3 comparison of the relative thermal performance of the examples with R134a
| Refrigerant | Exhaust temperature/. degree.C | Compression ratio | Relative COP | Relative volume refrigerating capacity |
| R134a | 54.82 | 3.09 | 1 | 1 |
| EXAMPLE 1 | 64.13 | 2.85 | 1.037 | 1.31 |
| EXAMPLE 2 | 65.24 | 2.81 | 1.034 | 1.35 |
| EXAMPLE 3 | 67.54 | 2.83 | 1.039 | 1.40 |
| EXAMPLE 4 | 63.44 | 2.79 | 1.031 | 1.29 |
| EXAMPLE 5 | 66.36 | 2.78 | 1.027 | 1.28 |
| EXAMPLE 6 | 59.52 | 2.81 | 1.032 | 1.29 |
| EXAMPLE 7 | 64.65 | 2.80 | 1.023 | 1.48 |
| EXAMPLE 8 | 62.70 | 2.84 | 1.025 | 1.49 |
| EXAMPLE 9 | 62.58 | 2.85 | 1.029 | 1.46 |
| EXAMPLE 10 | 68.96 | 2.83 | 1.038 | 1.51 |
| Comparative example 1 | 66.42 | 2.84 | 0.841 | 1.15 |
| Comparative example 2 | 65.12 | 2.90 | 0.915 | 1.39 |
| Comparative example 3 | 72.14 | 2.82 | 0.893 | 1.33 |
| Comparative example 4 | 64.16 | 2.83 | 0.825 | 1.22 |
| Comparative example 5 | 67.52 | 2.84 | 0.911 | 1.28 |
| Comparative example 6 | 69.54 | 2.92 | 0.866 | 1.33 |
| Comparative example 7 | 66.65 | 2.88 | 0.925 | 1.50 |
| Comparative example 8 | 68.63 | 2.83 | 0.936 | 1.39 |
| Comparative example 9 | 73.07 | 2.82 | 0.864 | 1.55 |
As can be seen from Table 3, when the mixed refrigerant provided by the invention is used in a stepped temperature reduction dehumidification system, the volume refrigeration capacity and the efficiency COP value of the mixed refrigerant are superior to those of the traditional R134a dehumidification system, and the mixed refrigerant can be an environment-friendly refrigerant replacing R134 a.
In addition, because the stepped dehumidification system has a certain requirement on the proportion of the mixed refrigerant, when the total charge amount of the mixed refrigerant is fixed, when one component exceeds the proportion required by the right, the components of the rest refrigerants are less, and the required amount of evaporation heat exchange cannot be met, the stepped cooling effect cannot be achieved, the energy efficiency is further influenced, and the normal operation of the system is influenced.
As can be seen from comparing the first to third examples of the present invention with comparative example 1, the content of the first component is preferably in the range of 50 to 75%, which may otherwise affect the normal operation of the system.
As can be seen from comparing the first to third examples of the present invention with comparative example 2, the content of the second component is preferably in the range of 20 to 45%, which may otherwise affect the normal operation of the system.
As can be seen from comparing the first to third examples of the present invention with comparative example 3, the content of the third component is preferably in the range of 5 to 15%, which may otherwise affect the normal operation of the system.
As can be seen from comparing the fourth to sixth examples of the present invention with comparative example 4, the content of the first component is preferably in the range of 50 to 75%, which may otherwise affect the normal operation of the system.
As can be seen from comparing the fourth to sixth examples of the present invention with comparative example 5, the content of the second component is preferably in the range of 20% to 45%, which may otherwise affect the normal operation of the system.
As can be seen from comparing the fourth to sixth examples of the present invention with comparative example 6, the content of the third component is preferably in the range of 5 to 15%, which may otherwise affect the normal operation of the system.
As can be seen from comparing the seventh to tenth examples of the present invention with comparative example 7, the content of the first component is preferably in the range of 50 to 75%, which may otherwise affect the normal operation of the system.
As can be seen from comparing the seventh to tenth examples of the present invention with comparative example 8, the content of the second component is preferably in the range of 20 to 45%, which may otherwise affect the normal operation of the system.
By combining the seventh to tenth examples of the present invention with comparative example 9, it can be seen that the content of the third component is preferably in the range of 5 to 15%, which may otherwise affect the normal operation of the system.
Embodiments of the household appliance
The household appliance of the embodiment comprises the heat exchange system in the embodiment of the heat exchange system. The household appliance can be an air conditioner, a refrigerator or a dehumidifier and other equipment with a stepped temperature reduction and dehumidification system.
Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, not limitations, and various changes and modifications may be made by those skilled in the art, without departing from the spirit and scope of the invention, and any changes, equivalents, improvements, etc. made within the spirit and scope of the present invention are intended to be embraced therein.
Claims (9)
1. A mixed refrigerant characterized by consisting of a first component, a second component and a third component, the first component being trifluoroiodomethane, the second component being 1, 1-difluoroethane and the third component being ammonia;
according to the weight percentage, the content of the first component is 60-70%, the content of the second component is 20-30%, and the content of the third component is 10-15%.
2. The mixed refrigerant according to claim 1, characterized in that:
the content of the first component is 60%, the content of the second component is 25%, and the content of the third component is 15%.
3. A mixed refrigerant characterized by consisting of a first component, a second component and a third component, the first component being trifluoroiodomethane, the second component being 3,3, 3-trifluoropropene, the third component being ammonia;
the content of the first component is 58-65%, the content of the second component is 20-29%, and the content of the third component is 13-15% by weight percentage.
4. The mixed refrigerant of claim 3, wherein:
the content of the first component is 60%, the content of the second component is 25%, and the content of the third component is 15%.
5. A mixed refrigerant characterized by consisting of a first component, a second component and a third component, the first component being trifluoroiodomethane, the second component being 2,3,3, 3-tetrafluoropropene, the third component being ammonia;
the content of the first component is 50 to 75 percent, the content of the second component is 20 to 40 percent, and the content of the third component is 5 to 15 percent according to weight percentage.
6. The mixed refrigerant of claim 5, wherein:
the content of the first component is 50%, the content of the second component is 35%, and the content of the third component is 15%.
7. A heat exchange system characterized by using the mixed refrigerant according to any one of claims 1 to 6.
8. The heat exchange system of claim 7, wherein:
the heat exchange system is a stepped cooling and dehumidifying system.
9. Household appliance, characterized in that it comprises a heat exchange system according to claim 7 or 8.
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| CN110845995A (en) * | 2019-10-16 | 2020-02-28 | 珠海格力电器股份有限公司 | Environment-friendly mixed working medium, composition and heat exchange system |
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