JPH01139680A - Working medium mixture - Google Patents

Abstract

PURPOSE:To obtain the title novel mixture having excellent refrigeration and heating efficiency, usable for refrigerator, heat pump, etc., and having excellent thermal stability, by using ethane and monochlorotetrafluoroethane as essential components. CONSTITUTION:The objective mixture contains ethane and monochlorotetrafluoroethane preferably at a molar ratio of 1:99-60:40. In the case of necessitating the improvement in the thermal stability for the use under severe condition, the working medium is added with about 1wt.% of a stabilizer such as dimethyl phosphite.

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 122), ammonia, etc. 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 there is active research into evaluating it as a working medium. It is being done. The present invention improves heat recovery efficiency, especially in freezers, refrigerators,
This new product provides highly efficient fluorocarbons 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 ethane (hereinafter abbreviated as old 70) and monochlorotetrafluoroethane as essential components.

Monochlorotetrafluoroethane in the present invention includes:
1-chloro-1,2,2,2-tetrafluoroethane (
Two types of isomers are known: R124) and 1-chloro-1,1,2,2-tetrafluoroethane (R124a), but since their physical properties are similar to each other, they cannot be used alone. Alternatively, mixtures of these may also be used.

In the following description, an example will be shown in which R170 and old 24 are mixed.

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 Figure 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, 6, 6' is a heat I
IA fluid piping is shown.

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 a pressure reducing device 4, and then led to an evaporator 5, which is a heat source that is introduced through a pipe 6 in the evaporator 5 and discharged from a pipe 6. After being heated by the fluid,
It is sucked into the compressor 1 again and repeats the above cycle. 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 pressure Wj machine in Fig. 1 corresponds to the change from 8 to 9 or from 13 to 14 in Figs. 2 and 3.
, the working medium changes due to the condenser from 9 → 10 → 11 or 14 → 15 → 16 → 17, the working medium changes from 11 to 12 or from 17 to 18 due to the pressure reducing device, and the working medium changes from 11 to 12 or from 17 to 18 due to the evaporator. The change corresponds to a change 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 with code 9 or 15; hereinafter referred to as east line temperature)
It was set. Tables 1 to 12 show the coefficient of performance and refrigeration capacity per unit volume of the compressor in the above-mentioned refrigeration cycle system using the working medium mixture of the present invention, along with comparative examples.

As can be understood from the table, the coefficient of performance and refrigerating capacity of the refrigeration cycle using the working medium mixture of the present invention in which the mixing molar ratio of R170 and R124 is in the range of 1 = 99 to 60:40 are This is an improvement over the previous case, especially when the mixing molar ratio of old 70 and R124 was about 20:
It can be seen that when using the working medium mixture of the present invention, which is around 80, it is greatly improved and extremely effective. Incidentally, if the mixing ratio of R170 is too large, it is not preferable in terms of flammability.

The working medium mixture of the present invention is particularly effective in refrigeration cycle applications for air conditioning, refrigeration and refrigeration in low to high temperature fields, or can also be used as a working medium in 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, if severe conditions of use require improved thermal stability, dimethyl phosphide may be added. , 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. A small amount of about 1 part by weight may be added to 100 parts by weight of the working medium.

Table 1 (Evaporation temperature: 20℃, Condensation temperature: 260℃ 1 Degree of supercooling: 0℃) Table 2 (Evaporation temperature: 20℃, Condensation temperature:
40@C1 degree of supercooling 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 is significantly improved compared to 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 cycles using the working medium mixture of the present invention as the working medium. This is a diagram.

Claims (1)

[Scope of Claims] 1. A working medium mixture characterized by containing ethane and monochlorotetrafluoroethane as essential components. 2. The working medium mixture according to claim 1, wherein the mixing molar ratio of ethane and monochlorotetrafluoroethane is 1:99 to 60:40.