JPH01141981A - Working medium mixture - Google Patents

Abstract

PURPOSE:To obtain the title mixture excellent in an efficiency of refrigerating cycle and usable in a refrigerating machine, a heat pump, etc., by mixing trichlorotrifluoroethane with monochlorotetrafluoroethane. CONSTITUTION:Trichlorotrifluoroethane is mixed with monochlorotetrafluoroethane at a molar ratio of 1-99:99-1, preferably, about 44:56, and a stabilizer (e.g., dimethyl phosphite) is optionally added to the mixture.

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.

The working media used in these devices include water, hydrocarbons such as propane and butane, and trichlorofluoromethane (
CFCs such as R11) and chlorodifluoromethane (R22), ammonia, and the like are known.

[Problems to be solved by the invention] Freon is less toxic, non-flammable, and 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 relates to a working medium mixture characterized in that it contains trichlorotrifluoroethane and monochlorotetrafluoroethane as essential components.

Trichlorotrifluoroethane in the present invention includes 1
, 1,2-trichlorotrifluoroethane (R113)
and 1.1.1-trichlorotrifluoroethane (R11
Two types of isomers of 3a) are known, but since their physical properties are similar to each other, these may be used alone or a mixture thereof may be used. In addition, monochlorotetrafluoroethane includes monochloro 1,2,2,2-
Tetrafluoroethane (R124) and 1-chloro-1,
2 of 1,2,2-tetrafluoroethane (R124a)
Since different types of isomers are known and their physical properties are similar to each other, these may be used alone or a mixture thereof may be used. In the following explanation, R11
An example of using a mixture of :l and R124 is shown below.

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 a working medium mixture (hereinafter also simply referred to as working medium) of the present invention. In FIG. 1, 1 is a compressor, 2 is a condenser, 3.3' is a load fluid piping, 4 is a pressure reducing device, 5 is an evaporator, and 6.6' is a heat source fluid piping.

In the refrigeration cycle system shown in FIG. 1, the 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. The condensed working medium is depressurized by the pressure reducing device 4, and then led to the evaporator 5, where the heat source is introduced through the tube 6 and discharged through the tube 6''. After being heated by the fluid,
It is sucked into the compressor 1 again and the above cycle is repeated. On the other hand, the heat source fluid is cooled in the evaporator 5, and the heat source fluid is cooled in the tube 6'.
It is then subjected to cooling.

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 FIG. 1 is the change from 8 to 9 or from 13 to 14 in FIGS. 2 and 3.
The working medium change due to the condenser is 9 → 10-+11 or 14 → 15 → 18 → 17, the working medium change due to the pressure reducing device is 11 to 12 or 17 to 18, and the working medium change due to the evaporator is 11 to 12 or 17 to 18. The changes correspond to changes from 12 to 8 or from 18 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 of the condenser (temperature of code 9 or 15, hereinafter referred to as condensing temperature)
It was set. Tables 1 to 2 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 can be seen from the table, 1 of the working medium mixture of the invention
Although R113, which is a constituent acid, has the advantage of having a higher coefficient of performance than R124, it has the disadvantage of having a lower refrigerating capacity per unit volume of the compressor. On the other hand, R1
Although Compressor No. 24 is superior to R]1:1 in terms of refrigerating capacity per unit volume of the compressor, it has 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, it is possible to greatly improve the coefficient of performance of R124 and the refrigerating capacity of R113. In particular, R113 and R12
It can be said that a working medium mixture with a mixing molar ratio of about 44:56 has an extremely high improvement in the coefficient of performance.

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. It can also happen.

The working fluid mixture of the present invention has excellent thermal stability and does not require stabilizers under normal conditions of use; however, when severe conditions of use require improved thermal stability, dimethyl phosphide may be used. , phosphite compounds such as diisopropyl phosphite and diphenyl phosphite, or thiophosphite compounds, or phosphine sulfide compounds such as triphenoxyphosphine sulfide and trimethylphosphine sulfide, and other stabilizers such as lycidyl ethers. It may be added in a small amount of about 1 part by weight per 100 parts by weight of the working medium.

Table 1 (Evaporation temperature: 0°C, Condensation temperature: 60°C 9 Supercooling degree: 0'C) Table 2 (Evaporation temperature knee 20°C 1 Condensing temperature = 40°C 1 Supercooling degree 20°C) [Invention [Effect] The working medium mixture of the present invention is particularly excellent in refrigeration cycle efficiency, that is, freezing and heating efficiency, and is seen to be significantly improved compared to trichlorotrifluoroethane and monochlorotetrafluoroethane.

[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 working medium. This is a diagram filled in. Figure 1 Figure 2 Enthalpy.

Claims (1)

[Claims] 1. A working medium mixture comprising trichlorotrifluoroethane and monochlorotetrafluoroethane as essential components. 2. The working medium mixture according to claim 1, wherein the mixing molar ratio of trichlorotrifluoroethane and monochlorotetrafluoroethane is 1:99 to 99:1.