JPH01153786A - Working medium mixture - Google Patents

Abstract

PURPOSE:To obtain a novel working medium mixture, intending to recover heat and having high freeze- and heat-efficiency, comprising dichlorotetrafluoroethane, etc., and dichlorotrifluoroethane as essential components. n, Cu) to give a regenerating agent. CONSTITUTION:The aimed mixture is obtained by mixing (A) one or more compounds selected from dichlorotetrafluoroethane, tetrafluoroethane, diflu oroethane and octafluorocyclobutane with (B) dichlorotrifluoroethane, usually in the molar ratios of 1:99-99:1 as essential components.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a novel working medium mixture that can be used in refrigerators, heat pumps, etc.

[Prior Art] Air conditioning, refrigeration and refrigeration equipment (refrigeration cycle/heat pump cycle), waste heat recovery power generation (Rankine cycle), heat exchange equipment (heat pipe), etc. have been put into practical use or tested and developed. Working media used in these devices include water, hydrocarbons such as propane and butane, trichlorofluoromethane (R11), and chlorodifluoromethane (R11).
CFCs such as 22) or ammonia are known.

[Problems to be solved by the invention] Freon has low toxicity, is non-flammable, and is chemically stable, and various types of fluorocarbons with different standard boiling points are easily available, so evaluation research as a working medium has been actively conducted. It is being done. The present invention improves heat recovery efficiency, especially in freezers, refrigerators,
The objective is to provide new fluorocarbons that are highly efficient for heating and cooling equipment, hot water supply equipment, and heat pump systems for the purpose of waste heat recovery.

[Means for solving the problems] The present invention provides dichlorotetrafluoroethane, tetrafluoroethane, monochlorodifluoroethane, difluoroethane, and octafluorocyclobutane (RC31B).
The present invention relates to a working medium mixture characterized in that it contains at least one member selected from the following and dichlorotrifluoroethane as essential components.

Dichlorotrifluoroethane in the present invention includes 1,
1-dichloro-2,2,2-)lifluoroethane (R1
23), 1,2-dichloro-1,2,2-)lifluoroethane (R123a) and 1,1-dichloro-1
, 2,2-trifluoroethane (R123b) are known, but since their physical properties are similar to each other, they can be used alone or as a mixture. good. For dichlorotetrafluoroethane, 1,2-dichlorotetrafluoroethane (R114)
and 1,1-dichlorotetrafluoroethane (R11
Two types of isomers of 4a) are known, and since their physical properties are similar to each other, these may be used alone or a mixture thereof may be used. Tetrafluoroethane includes 1,1,2,2-tetrafluoroethane (R1
34) and 1,1,1,2-tetrafluoroethyl 7 (R
Two types of isomers of 134a) are known, and since they have similar physical properties, they may be used alone or a mixture thereof may be used. In addition, as monochlorodifluoroethane, 1-chloro-2,2-difluoroethane (R142), 1-chloro-1,2-difluoroethane (R142a) and 1-chloro-1,1
Three types of isomers of -difluoroethane (R142b) are known, and R142b is particularly preferred. As difluoroethane, 1,2-difluoroethane (R15
Two types of isomers are known: 2) and 1,1-difluoroethane (R152a), and R152a is particularly preferred. In the following explanation, R123 and R114, R
123 and R134a, R123 and R142b,
R123 and R152a and R123 and I'H1; 31
An example using 8 working medium mixtures is shown.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to FIG. 1, which shows a flow sheet of a refrigeration cycle system using the working medium mixture of the present invention (hereinafter sometimes simply referred to as working medium). In FIG. 1, 1 is a compressor, 2 is a condenser, 3 and 3' are load fluid pipes, 4 is a pressure reducing device, 5 is an evaporator, and 6 and 6' are heat source fluid pipes.

In the refrigeration cycle system shown in FIG. 1, a working medium is compressed by a compressor 1 and then led to a condenser 2, where it is cooled and condensed by a load fluid introduced through a pipe 3. On the other hand, the load fluid is reversely heated in the condenser 2 and passed through the pipe 3' for load heating. Next, the condensed working medium is depressurized by the pressure reducing device 4, and then led to the evaporator 5, where it is heated by the heat source fluid introduced from the pipe 6 and discharged from the pipe 6', and then heated again. It is sucked into the compressor 1 and the above cycle is repeated. On the other hand, the heat source fluid is reversely cooled in the evaporator 5 and is provided for cooling through the tube 6'.

2 and 3 are pressure-enthalpy diagrams showing the cycles of the working medium mixture in the refrigeration cycle system shown in FIG. 1. Figure 2 shows what becomes wet when the working medium, saturated steam, is compressed adiabatically.
Figure 3 shows what is in a dry state.

The change in the working medium due to the compressor in Figure 1 is the change from 8 to 9 or from 13 to 14 in Figures 2 and 3, and the change in the working medium due to the condenser is 9→10→11 or 1.
The change in working medium due to the pressure reducing device is from 11 to 12 or from 17 to 18, and the change in working medium due to the evaporator is from 12 to 8 or 1.
This corresponds to the change from 8 to 13, respectively.

The operating conditions of the refrigeration cycle system shown in FIG. 1 using the working medium mixture of the present invention are the evaporation path temperature of the working medium in the evaporator (temperature 7 or 13, hereinafter referred to as evaporation temperature) and the working medium in the condenser. temperature at the beginning of condensation (temperature with code 9 or 15; hereinafter referred to as condensation temperature)
It was set. Tables 1 to 10 show the coefficient of performance and refrigeration capacity per unit volume of the compressor in the above refrigeration cycle system using the working medium mixture of the present invention, along with comparative examples.

As understood from the table, R123, which is one component of the working medium mixture of the present invention, is R114, R134a, R1
Although it has the advantage of having a higher coefficient of performance than RC318, R152a, and RC318, it has the disadvantage of having a low refrigerating capacity per unit volume of the compressor. on the other hand,
Although R114, R134a, R142b, R152a and RC318 are superior to R123 in terms of refrigerating capacity per unit volume of the compressor, they have the disadvantage of a low coefficient of performance. That is, it can be seen that by using the working medium mixture of the present invention, each of the disadvantages can be improved and the advantages can be utilized, and it is extremely effective. That is, by using the working medium mixture of the present invention, the refrigerating capacity per compressor unit volume of R123 and R114, R134a, R142b, R152a
And the coefficient of performance of RC318 can be greatly improved. In particular, the mixing molar ratio of R123 and R114 is about i9
0:10, R123/R134a (1) The mixing molar ratio is about 80:20, the mixing molar ratio of R123/R142b is about 80:20, the mixing molar ratio of R123/R152a is about 80:20, and the mixing of R123 and RC318. Each working medium mixture having a molar ratio of about 80:20 has an extremely high improvement rate in the coefficient of performance and can be said to be extremely effective. Furthermore, R142, which is a component of the working medium mixture of the present invention,
Since R152a and R152a are flammable, there is a problem in terms of safety. However, it also has the characteristic that it can be made nonflammable by mixing it with nonflammable R123.

The working medium mixture of the present invention is particularly effective for refrigeration cycle applications for air conditioning, refrigeration and refrigeration in low to high temperature fields, but can also be used as a working medium for various other heat recovery techniques such as the Rankine cycle. You can also do that.

The working medium mixture of the present invention has excellent thermal stability and does not require stabilizers under normal conditions of use; however, when it is necessary to improve thermal stability due to severe conditions of use, dimethyl phosphite may be added. , phosphite compounds such as diisopropyl phosphite and diphenyl phosphite, thiophosphite compounds, phosphine sulfide compounds such as triphenoxyphosphine sulfide and trimethylphosphine sulfide, and other stabilizers such as glycidyl ethers as the working medium. It may be added in a small amount of around 1 part by weight per 100 parts by weight.

Table 1 (7) Vibrantness: O”0.
Degree of supercooling: 20℃) Table 3 (Supercooling temperature: O' (1!, Degree of supercooling: 60℃, Degree of supercooling: 20℃) Table 4 (Evaporation temperature: O' (1!, Degree of supercooling: 20℃)
°C, condensation temperature = 40 °C, supercooling degree 20 °C) Table 5 (Call length: O'C, thermal conductivity: 60 °C9 supercooling degree 20 °C) Table 6
Table (Steam slope M knee 20°C9 condensing temperature: 40°C, degree of supercooling 20°C) Table 7 (Zhengshima Watari: 0°C, Jealousy Watari: 60°C,
Supercooling degree: 0℃) Table 8 (Zheng Mito knee 20℃, Jeongi Odo:
40℃, degree of supercooling: 0℃) Table 9 (Evaporation temperature: 20℃, degree of supercooling: 60℃, degree of supercooling: 20℃) Table 10 (Evaporation temperature: 20℃, degree of supercooling: 20℃) Table 10: 40°C2 supercooling degree 20°C) [Effects of the invention] The working medium mixture of the present invention is particularly excellent in refrigeration cycle efficiency, that is, freezing and heating efficiency, and has excellent refrigeration cycle efficiency, ie, freezing and heating efficiency, and is suitable for dichlorotrifluoroethane, dichlorotetrafluoroethane, tetrafluoroethane, monochloro A significant improvement is observed compared to difluoroethane, difluoroethane and octafluorocyclobutane.

[Brief explanation of the drawing]

Fig. 1 is a flow sheet of a refrigeration cycle for explaining one embodiment of the present invention, and Figs. 2 and 3 are pressure-enthalpy diagrams of a cycle using the working medium mixture of the present invention as a refrigerant. It is a diagram. January A, 1986

Claims (1)

[Scope of Claims] 1. A working medium comprising at least one member selected from dichlorotetrafluoroethane, tetrafluoroethane, monochlorodifluoroethane, difluoroethane, and octafluorocyclobutane and dichlorotrifluoroethane as essential components. blend. 2. The mixture molar ratio of at least one selected from dichlorotetrafluoroethane, tetrafluoroethane, monochlorodifluoroethane, difluoroethane and octafluorocyclobutane and dichlorotrifluoroethane is 1:99 to 99:1. A working medium mixture according to claim 1.