JP2841430B2 - Working medium mixture - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a novel halogenated hydrocarbon-based mixture which can be used as a substitute for chlorofluorocarbon and has excellent properties as a working medium and the like.

[Prior art] Halogenated hydrocarbon compounds (hereinafter simply referred to as chlorofluorocarbons) are often non-flammable, nonflammable and chemically stable, and various fluorocarbons having different standard boiling points are available. Various fluorocarbons are used as a solvent, a foaming agent, a propellant or a refrigerant.
For example, 1,1,2-trichloro-1,2,2-trifluoroethane (R113) is used as a solvent, trichloromonofluoromethane (R11) is used as a blowing agent, and dichlorodifluoromethane (R12) is used as a propellant or a refrigerant. It is used.

[Problems to be Solved by the Invention] Chemically particularly stable R11, R12, R113,1,2-dichlorotetrafluoroethane (R114) and chloropentafluoroethane (R115) have a long life in the troposphere and are diffused. It reaches the stratosphere, where chlorine radicals generated by decomposition by sunlight cause a chain reaction with ozone and destroy the ozone layer, and there is a movement to regulate the use of these conventional fluorocarbons. For this reason, instead of these conventional fluorocarbons, the search for alternative fluorocarbons that are less likely to destroy the ozone layer is being actively conducted.

51.8% by weight of regulated CFC R115 and monochlorodifluoromethane (R22), a non-regulated CFC 48.
An azeotropic mixture medium consisting of 8% by weight (hereinafter referred to as R502)
In particular, the compression rise rate is small as a working medium intended for refrigeration in the low temperature field, the effect on polymer materials is small,
It has excellent features such as excellent working medium performance, is extremely useful, and there is a demand for the development of a CFC alternative.

An object of the present invention is to provide a novel CFC mixture which can be used as an alternative CFC while satisfying the excellent characteristics of conventional CFCs.

Means for Solving the Problems The present invention is a working medium mixture comprising 23.6 to 90% by weight of R22 and 76.4 to 10% by weight of pentafluoroethane (R125).

Since the mixture of the present invention has higher performance than the conventional R502 particularly as a working medium for a refrigerator, a heat pump or the like, it is extremely useful as a substitute for R502.

Since the composition of the working medium mixture according to the present invention has the advantages that the composition does not fluctuate even after recycling and that it can be used in the same way as a conventional single fluorocarbon and does not require a significant change in the prior art, the mixing ratio of the working medium mixture of the present invention is Is 23.6-90% by weight of R22 and R125
Is 76.4 to 10% by weight.

In the working medium mixture of the present invention, when improvement of thermal stability is required, phosphite-based compounds such as dimethyl phosphite, diisopropyl phosphite, diphenyl phosphite, or thiophosphite-based compounds, or triphenyl phosphine A working medium containing at least one of phosphine sulfide compounds such as sulfide and trimethyl phosphine sulfide, and other stabilizers;
A small amount of about 1 part by weight can be added to 100 parts by weight.

The working medium mixture of the present invention consisting of R22 and R125 is preferred because of its higher capacity than conventional R502.

Embodiment FIG. 1 shows a flow sheet of a refrigeration cycle system using the working medium of the present invention.

In FIG. 1, 1 is a compressor, 2 is a condenser, 3, 3 'is a pipe for a load fluid, 4 is a pressure reducing device, 5 is an evaporator, and 6, 6' is a pipe for a heat source fluid.

In the refrigeration cycle system shown in FIG. 1, after the working medium is compressed by the compressor 1, it is guided to the condenser 2, where it is cooled and condensed by the load fluid introduced from the pipe 3. On the other hand, the load fluid is heated in the condenser 2 in reverse and is supplied to the load heating via the pipe 3 '. The condensed working medium is then depressurized by the decompression device 4, guided to the evaporator 5, heated by the heat source fluid introduced from the pipe 6 in the evaporator 5 and discharged from the pipe 6 ′, and then again. The suction is performed by the compressor 1 and the above cycle is repeated. On the other hand, the heat source fluid is conversely cooled in the evaporator 5 and is provided for cooling via the pipe 6 '.

FIGS. 2 and 3 show the cycle of the working medium in the refrigeration cycle system shown in FIG. 1 on a pressure-enthalpy diagram. FIG. 2 shows a state where the saturated steam of the working medium is adiabatically compressed, and FIG. 3 shows a state where the saturated vapor becomes a dry state.

The change of the working medium by the compressor in FIG. 1 is the change of reference numerals 8 to 9 or 13 to 14 in FIGS. 2 and 3, and the change of the working medium by the condenser is 9 → 10 → 11 or 14 → 15 → 16
→ Change of working medium by decompression device from 11 to change of 17
For a change of 12 or 17 to 18, a change of the working medium by the evaporator corresponds to a change of 12 to 8 or 18 to 13, respectively.

As the operating conditions of the refrigeration cycle system shown in FIG. 1 using the working medium of the present invention, the end temperature of evaporation of the working medium in the evaporator (temperature of reference numeral 7 or 13; hereinafter referred to as evaporation temperature) and the condensation of the working medium in the condenser The initial temperature (the temperature of reference numeral 9 or 15; hereinafter, referred to as the condensation temperature) was set. Table 1 shows the coefficient of performance, the refrigerating capacity per unit volume of the compressor, the inlet / outlet temperatures of the evaporator, and the inlet / outlet temperatures of the condenser in the refrigeration cycle system using the working medium of the present invention.

[Effect of the Invention] The working medium of the present invention can be used as an alternative CFC while satisfying the excellent characteristics of the conventional CFC, and has the same usage as the conventional single CFC, which has a small variation in composition during recycling. There is an advantage that a significant change of the conventional technology is not required. Further, the working medium mixture of the present invention is particularly effective as a working medium applied to a refrigeration cycle for air conditioning, freezing and refrigeration in the low to medium temperature field, but for a Rankine cycle or other various heat recovery technologies. Can be used as a working medium.

[Brief description of the drawings]

FIG. 1 is a flow sheet of a refrigeration cycle for explaining one embodiment of the present invention, and FIGS. 2 and 3 are diagrams in which a cycle using the working medium of the present invention is entered in a pressure-enthalpy diagram. .

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) C09K 5/04 WPI / L (QUESTEL) CA (STN)

Claims (1)

(57) [Claims] 1. A working medium mixture consisting of 23.6 to 90% by weight of monochlorofluoromethane and 76.4 to 10% by weight of pentafluoroethane.