JPS5959779A - Refrigerant - Google Patents

Abstract

PURPOSE:To provide a refrigerant which shows an improved performance coefficient higher than those of flon 12 or 22 and is suitable for use in a heat-pump type room heater, prepared by adding 1,1-dichloro-1,1-difluoroethane to chlorodifluoromethane. CONSTITUTION:The refrigerant is prepared by mixing, preferably, 95-10wt% chlorodifluoromethane with 5-90wt% 1,1-dichloro-1,1-difluoroethane. It is a non- azeotropic composition and its temperature gradient can be approximated to that of a fluid to be cooled in an evaporator to have high refrigeration efficiency, i.e. a high performance coefficient.

Description

[Detailed description of the invention] The present invention relates to refrigerants, ie, the working fluids of refrigerators.

Hitherto, as refrigerants, talolofluorohydrocarbon purple, full-A hydrocarbons, azeotropic compositions thereof, or compositions close to these have been known, and currently dichlorodifluoromethane (hereinafter referred to as Freon-12) and chlorodifluoromethane ( (hereinafter referred to as Freon-22) is used as a refrigerant.

In recent years, there has been an increasing desire to greatly improve the refrigeration performance, especially the coefficient of performance, of such refrigerants.

An object of the present invention is to provide an IC refrigerant with an improved coefficient of performance. The coefficient of performance here is expressed as refrigerant capacity/compression work, and refrigeration capacity is liquid cooling N per unit time.
The coefficient of performance corresponds to the efficiency of the refrigerant, since it is the amount of heat taken away from one body, and the compression work is the work color of the power for operating the refrigerator per unit time (expressed in thermal units). It is something that can be written.

As a result of research into refrigerants with improved coefficient of performance, the present inventors found that 1-chloro-1
, 1-difluoroethane was found to be able to provide a refrigerant with an improved coefficient of performance that exceeds that of dichlorodifluoromethane (Freon-12) and chlorodifluoromethane (Freon-22). The present invention has been completed based on new findings.

The present invention relates to chlorodifluoromethane and 1-chloro-
Concerning refrigerants consisting of 1,1-difluoroethane, in particular 95-10% of talolodifluoromethane and 1
-Chloro-1,1-difluoroethane 5-90% by weight
A negative medium consisting of p, r t t, and i. 1-chloro-1
, 1-difluoroethane is less than 5% by weight or more than 90% by weight, Freon-12 or Freon-2
No significant improvement in the coefficient of performance was obtained compared to the case of 2 alone.

In addition, the refrigerant of the present invention has a large refrigerating capacity, especially Freon-121;
0 wt. and 1-chloro-1,1=difluoroethane
It exhibits a significantly large refrigerating capacity at a composition of 5 to 90% by weight.

The refrigerant according to the present invention has a specific heat ratio lower than that of Freon-22, and the discharge gas temperature of the compressor is lower than Freon-22J.
It is also suitable to use water as a medium for refrigeration cycles with a high I15u.

The refrigerant of the present invention is a non-azeotropic composition. In general, for A-compounds and azeotropic compositions, the evaporation temperature applied to the evaporator is constant because evaporation is carried out under constant pressure, but for non-azeotropic mixture compositions, the evaporation temperature is constant. Low temperature in humans [],
The temperature becomes high at the evaporator outlet. On the other hand, the fluid to be cooled is flowed against the flow of refrigerant in the evaporator so as to exchange heat,
Even if the evaporation temperature of the refrigerant is constant, there is a temperature gradient along the flow.

That is, within the evaporator, the temperature difference between the refrigerant and the fluid to be cooled becomes smaller as the fluid to be cooled advances. In the present invention, by using the refrigerant as a non-azeotropic mixture composition, it is possible to approach the temperature gradient of the fluid to be cooled in the evaporator, thereby increasing the effectiveness of refrigeration. 'rj, that is, the coefficient of performance was excellent.

The present invention will be explained below with reference to Examples and Comparative Examples.

Examples 1 to 18; J> and Comparative Examples 1 to 6 In the same 1 horsepower cold WI machine, 8 degrees (of the refrigerant) in the condenser population is set to 40 degrees Celsius, and the minimum evaporation rate m is listed in the following table. The refrigerant of the present invention, Freon-12 (comparative example) and Freon-22 (comparative example), having the composition shown in the following table, was set at a predetermined temperature to cool the temperature. ! ! The machine was operated and the maximum evaporation temperature, refrigeration capacity, coefficient of performance, and degree of superheat were measured.

The results are shown in the table below. Note that 1-chloro-1°1-difluoroethane is roughly equivalent to Freon-142b.

Between procedural amendments (voluntary) November 19, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi 1 Indication of the case Patent Application No. 171307 of 1983 2 Name of the invention Refrigerant 3 Person making the amendment Relationship with the case Patent applicant ( 285) Daikin Industries, Ltd. 4 Agent 5 Date of amendment order - ``Sponsorship 6 Section 7 of ``Detailed explanation of the invention 1 in the specification subject to amendment'' Contents of amendment I□ Contents of amendment 1 Description cylinder 2nd member 2 (Correct "refrigerant" in -1 to [refrigeration-1] 1゜2 Correct "refrigerant 4 to 1 refrigeration" on page 2, line 7 of the specification.

3 In the table on page 6 of Akirall1ll, the entry r2.00 2, OOj in the column of coefficient of performance in the second column from the right is corrected to 1'2.00 2,01.

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Claims (1)

[Claims] ■ Chlorodifluoromethane and 1-chloro-1,1
- A refrigerant consisting of difluoroethane. ■ Chlorodifluoromethane 95-1071N? )%
and 1-chloro-1,1-difluoroethane 5-90
% by weight of the refrigerant according to claim 1.