JPH01139683A - 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 n-butane and dichlorotrifluoroethane as essential components. CONSTITUTION:The objective mixture contains (A) n-butane and (B) dichlorotrifluoroethane preferably at a molar ratio of 1:99-50:50. 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 or triphenoxyphosphine sulfide.

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 relates to a working medium mixture characterized in that it contains n-butane and dichlorotrifluoroethane as essential components.

The present invention uses dichlorotrifluoroethane as 1,1-dichloro-2,2,2-trifluoroethane (R123).
and 1,2-dichloro-1,2,2-)lifluoroethane (R123a) and 1,1-dichloro-1,2,2
- Three types of isomers of trifluoroethane (R123b) are known, but since their physical properties are similar to each other, these may be used alone or a mixture of these may be used. In the description, n-butane and R12
An example of using a mixture of 3 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 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 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 tube 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 through the pipe 6 and discharged from the pipe 6', and then heated again. It is sucked into compression a1 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'.

FIGS. 2 and 3 show the cycles of the working medium mixture in the refrigeration cycle system shown in FIG. 1 on pressure-enthalpy diagrams. 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 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 of code 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 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 understood from the table, the coefficient of performance and refrigeration capacity of the refrigeration cycle using the working medium mixture of the present invention in which the mixing molar ratio of n-butane and R123 is in the range of 1 = 99 to 50:50 are as follows: This is an improvement over the case where the molar ratio of n-butane and R123 is approximately 3
When using the working medium mixture of the present invention which is around 0 near 0 1. It can be seen that this has been greatly improved and is extremely effective.

In addition, if the mixing ratio of n-butane is too large, it is not preferable from the viewpoint of flammability.

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 a stabilizer under normal conditions of use, but when it is necessary to improve thermal stability due to severe conditions of use, dimethyl phosphor is used. Stabilizers such as phosphite-based compounds such as phosphite, diisopropyl phosphite, and diphenyl phosphite, or thiophosphite-based compounds, or phosphine sulfide-based compounds such as triphenoxyphosphine sulfide and trimethylphosphine sulfide, and other glycidyl ethers. A small amount of about 1 part by weight may be added to 100 parts by weight of the working medium.

Table 1 (Light temperature: 0°C, 2 Condensing temperature: 60°C, Supercooling degree: 0°C) Table 2 (Evaporation temperature: 20°C, Condensing temperature:
40°C, degree of supercooling: 0°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 recognized to be a significant improvement compared to dichlorotrifluoroethane. .

[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)

[Claims] 1. A working medium mixture comprising n-butane and dichlorotrifluoroethane as essential components. 2. The working medium mixture according to claim 1, wherein the mixing molar ratio of n-butane and dichlorotrifluoroethane is 1:99 to 50:50.