JPS61152786A - Hydraulic medium mixture - Google Patents

Abstract

PURPOSE:The titled mixture suitable for heat pump. etc., having high heat recovery efficiency, slightly being influenced by various metallic materials of each part of devices, lubricant, water content, etc., comprising n-perfluorooctane and a specific halogenated hydrocarbon as essential components. CONSTITUTION:The aimed mixture comprising (A) n-perfluorooctane (n-C8F18), and (B) a halogenated hydrocarbon (preferably 1-4C hydrocarbon, such as CCl4, CHBrCl2, CCl3, CCl3, CHClFCCl2F, CCl2=CCl2, etc.) having 5-110 deg.C standard boiling point difference between the components A and B, as essential components.

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 heat pumps and the like.

[Conventional technology] Research is progressing to recover energy from heat sources in the medium and low temperature range, which is lower than the temperature obtained by burning fuels such as heavy oil and petroleum.
Ocean temperature difference power generation - 9 Geothermal binary power generation, waste heat recovery power generation, solar thermal power generation, temperature increase using heat pumps, heat exchange technology using heat pipes, etc. have been put into practical use or are being tested. The working media used in these recovery techniques include water, hydrocarbons such as propane and butane, and fluorocarbons such as trichloromonofluoromethane (R-11) and 1,2-dichlorotetrafluoroethane (R-114). , ammonia, etc. are known.

[Problems to be solved by the invention] Since fluorocarbons have low toxicity, are non-flammable, and are chemically stable, and various fluorocarbons with different boiling points are easily available, evaluation research as a working medium has been actively conducted. The present invention provides novel fluorocarbons that have high heat recovery efficiency, particularly for freezers, refrigerators, air-conditioning equipment, oil dispensers, or heat pump systems for the purpose of waste heat recovery.

[Means for Solving the Problems] The present invention is characterized in that n-perfluorooctane and a halogenated hydrocarbon having a standard boiling point difference of 5 to 110°C with n-perfluorooctane are essential components. The invention relates to working medium mixtures that

The standard boiling point of n-perfluorooctane (n-CsF+s) is 105°C, but the difference in boiling point from this is 5 to 110°C.
It has been found that a non-azeotropic medium mixed with a halogenated hydrocarbon at ℃ can improve the coefficient of performance, heating capacity, etc. of a heat pump system compared to the single component before mixing. n-0
As the halogenated hydrocarbon having a standard boiling point difference of 5 to 110°C with 8F18, the following compounds having 1 to 4 carbon atoms are preferable.

As methane derivatives, CG11, CChF, CHGI
3eCICI2F, CH2C12, CBrC13,
CBrz 012 , CBr3 CI , CBr1C1
zF.

CBr2CIF, GBr2F2, CHBrC12, C
HBr2CI, CHBr5 +CHBrCIF, CH
Br2 F , CH2B re 1 , CH2Br2.
012 BrF, CH3Br.

can be mentioned.

As an ethane derivative, CC1xCC13, CG13C
CI2F.

CG12FCC1zF, CChCCIFz, CC1z
FCCIFz, CC15CF3゜CCIhCC1h
, CC1zFCh , CBr1zCBrFz , CC1
5CF3゜CHCl2 CCl2 F , CC13CH
CIF, CHChCClh, CHCIFCChF
.

CC15CF3. CHClzCh , GHCIFCCI
Fz, CHClzCHCIz.

(:C13GHzCI, CH2ClCCl2F, CH
CIFCHCIF, C) IC12CHF2゜CCIF2
0H2CI, CC1FCHF2. CH2ClCF3. C
ClF20H2F.

12CH2C1, CCl3CH3, CHCIFG in CH
HzCI, CC12FCH: +.

CH2ClCF3, CHhCHtF, C1hC; IC
1hC1, CIC120H+.

CH2CICHz F , CHCIFcHa , CH2
FGHz F , CH2CICHs can be mentioned.

As an ethylene derivative, CCh-CC1z-GOIF-
GCI2*CCIF51CGIF, CGIF-CGIF
, CC1z-CFz, CHCl-CCl2.

CHCI affected CCIF, CG12-〇HF, 0101. H
ClCl, CHCl cue t.

012 CCl2. CHCl 禦CHF, C) 101 wing C
) IF.

As a cyclic compound, C1z-Oh-Ch to CCl2-
.

CGIF-CGIF-Ch-Ch, CGIF-Oh
-Ch-Ch.

L-11111"L-11111" CHCl-
CC12-CFz-CF2. CC1z-Oh-CF
z-C1h.

"L-11111" can be mentioned. - These halogenated hydrocarbons can be used alone or as a mixture of two or more. In particular, isomers have similar physical properties and can be used in mixtures without adversely affecting performance.

The present invention will be described in detail below with reference to FIG. 1, which shows a flow sheet of a heat pump system using the working medium of the present invention. 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, 8, 8'
indicates piping for heat source fluid.

In the heat pump system shown in FIG. 1, the working medium is cooled and condensed in the compression az by the load fluid introduced through the pipe 3. On the other hand, the load fluid is introduced into the condenser 2 through the pipe 6, heated by the heat source fluid discharged through the pipe B', and then sucked into the compressed Al again, repeating the above cycle.

FIGS. 2 and 3 show the cycles of the working medium in the heat pump system shown in FIG. 1 on pressure-enthalpy diagrams.

When saturated vapor as a working medium is adiabatically compressed, a wet state is shown in Fig. 2, and a dry state is shown in Fig. 3.

Changes in the working medium caused by the compressor in Figure 1 are shown in Figures 2 and 3.
In the change from 8 to 9 or 13 to 14 in the figure, the change in working medium due to the condenser is 9 → lO → 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 heat pump system shown in FIG. 1 using the working medium 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 condensation of the working medium in the condenser. Starting temperature (
A temperature of 9 or 15 (hereinafter referred to as condensation temperature) was set. As can be understood from Tables 1 to 4, which show the coefficient of performance, heating capacity per unit horsepower of the compressor, and circulation amount of the working medium in the above heat pump system using the working medium of the present invention, the mixing By doing so, the performance is improved compared to the single component before mixing. Also, n-
C (for IFIB, for example, R-21 (dichloromonofluoromethane), R-113 (1,1,2-)dichloro-1,2,2-trifluoromethane), R-1
23 (1,1-dichloro-2,2,2-trifluoroethane) or R-133 (1-chloro-1,2,2-trifluoroethane) in an Il amount (about o in molar fraction, al
One of their characteristics is that just by mixing them, the performance is better than that of each component alone. The preferred mixing ratio (molar ratio) is 1, for example R-21:n-C5F+e
So l2o, 4~t:10, R-113:n-C5F+
1:1 to 1:10 for a, R-123:n-CaFta
Then 1:0.8 to 1:10. R-133:n
-C3F+8 is l:tl, 5 to 1:10.

The working medium mixture of the present invention is particularly effective when applied to a heat pump system using a medium-low temperature heat source, but it can also be used as a working medium for Rankine cycle or various other heat recovery technologies. The working medium mixture has excellent thermal stability and does not require stabilizers under normal conditions of use, but if improved thermal stability is required due to severe conditions of use, dimethyl phosphite, diisopropyl Phosphite-based compounds such as phosphite, diphenylphosphite, thiophosphite-based compounds, or phosphine sulfide-based compounds such as triphenoxyphosphine, rulphide, trimethylphosphine sulfide, and other stabilizers per 100 parts by weight of the working medium. , may be added in a small amount of around 1 part by weight.

Table 1 (Evaporation temperature = 100'' C9 condensation temperature 150℃) Table 2 (Evaporation temperature: 100℃, Condensation temperature 150℃) Table 3 (Evaporation temperature: 100℃, Condensation temperature 150℃) Table 4 (Evaporation temperature: 100℃, Condensation temperature 150℃) Temperature: 100°C, condensation temperature 150°C) [Effects of the invention] Compared to the individual components before mixing, the working medium mixture of the present invention has
For example, the heating capacity and coefficient of performance of heat pumps can be improved. Furthermore, n-CaFta has high-temperature thermal stability, that is, it is not easily affected by various metal materials, lubricating oil, moisture, etc. in various parts of the device, so the working fluid mixture of the present invention containing n-CaFta also has high-temperature thermal stability. It can be improved.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet of a heat pump for explaining one embodiment of the present invention, and FIGS. 2 and 3 are pressure-enthalpy diagrams showing cycles using the working medium of the present invention.

Claims (1)

[Claims] 1. A working medium mixture comprising as essential components n-perfluorooctane and a halogenated hydrocarbon having a standard boiling point difference of 5 to 11.0°C with n-perfluorooctane.