JPH0882459A - Refrigerator with non-azeotropic refrigerant mixture of hfc system - Google Patents

Abstract

PURPOSE: To make a uniform composition of refrigerant mixture between an inlet port and an outlet port of a heat exchanging coil of a condensor or an evaporator and to reduce a variation in temperature by a method wherein at least one means for mixing refrigerant of gas-liquid mixed state is installed at the heat exchanging coil of the condensor and/or evaporator and even under a condition in which the non-azeotropic refrigerant mixture is applied. CONSTITUTION: Mixing members 11a having a plurality of buffle plates 10a arranged therein are installed in a heat exchanging coil 7 at a position of a length of about a half of an entire length ranging from an inlet port to an outlet port of the heat exchanging coil. Or, mixing members 11b having porous plates 10b arranged within the heat exchanging coil 7 are arranged at a position of about half of an entire length between the inlet port and the outlet port of the heat exchanging coil. Or, mixing members having a propeller arranged are installed at a position of about 2/3 of the entire length within the heat exchanging coil 7. Or, mixing members having a Konigs static mixer composed of a plurality of dividing plates are installed within the heat exchanging coil 7 at the same positions as above.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating apparatus using an HFC-based non-azeotropic refrigerant mixture, and more specifically to a non-flammable HFC which does not have a risk of depleting the ozone layer.
The present invention relates to a refrigerating apparatus which can be stably operated for a long period of time because the composition change of the refrigerant mixture in the refrigeration cycle can be reduced even when a non-azeotropic refrigerant mixture is used.

[0002]

2. Description of the Related Art Conventionally, a refrigerant used in a refrigerator is composed of dichlorodifluoromethane (hereinafter referred to as R-12) or an azeotropic mixed refrigerant R-12 and 1,1-difluoroethane (R-152a). There are many R-500s. R
The boiling point of −12 is −29.65 ° C. at atmospheric pressure, and the boiling point of R500 is −33.45 ° C., which is suitable for a normal refrigeration system and is a mineral compatible with a CFC-based refrigerant such as R-12. Refrigeration cycles that use refrigerating machine oils such as oils and alkylbenzene-based oils have reached high quality levels such as reliability and durability.

However, due to their high ozone depletion potential, each of the above refrigerants destroys the ozone layer when it reaches the ozone layer above the earth by being released into the atmosphere.
The destruction of the ozone layer is caused by chlorine groups (Cl) in the refrigerant. Therefore, a refrigerant having a low chlorine group content, for example, chlorodifluoromethane (HCFC-22,
R-22), chlorine-free refrigerants such as difluoromethane (HFC-32, hereinafter R-32), pentafluoroethane (HFC-125, hereinafter R)
-125) or 1,1,1,2-tetrafluoroethane (HFC-134a, hereinafter R-134a),
Alternatively, mixtures of these are considered as alternative refrigerants for these. The boiling point of R-22 is -40.
At 82 ° C., the boiling point of R-32 is −51.7 ° C. and R-1.
The boiling point of 25 is -48.5 ° C, and the boiling point of R-134a is
It is -26.5 degreeC.

The HFC-based refrigerant mixture is a mixture of HFC-based refrigerants.
It is a mixture of three or more kinds, and usually, there are many combinations in which the boiling point and the dew point of the mixture are different. In the present invention, these mixtures are referred to as HFC-based non-azeotropic refrigerant mixture. The HFC-based non-azeotropic refrigerant mixture is specifically, for example,
R125 / R143a / 134a (weight ratio 44/52 /
4) (R404A, boiling point -46.78 ° C, dew point -46.
08 ° C, trade name: HP62, manufactured by DuPont), R32 /
R125 / 134a (weight ratio 20/40/40) (R4
07A, boiling point -45.4 ° C, dew point -38.8 ° C, trade name: KLEA60G2, manufactured by ICI).

FIG. 6 shows an example of a typical refrigeration circuit. 1 is a compressor, 2 is a condenser, 3 is a dryer, 4 is a capillary tube, 5 is an evaporator, and 6 is an accumulator.
The arrow indicates the flow direction of the refrigerant. Since the refrigeration cycle using the HFC-based non-azeotropic refrigerant mixture is a non-azeotropic mixture, the composition of the refrigerant mixture changes in each part of the refrigeration cycle, and for example, the inlet of the heat exchange coil of the condenser 2 changes depending on the day of operation. Between the outlet and the outlet, or between the inlet and the outlet of the heat exchange coil of the evaporator 5, the composition of the refrigerant mixture is large, and the temperature change is large, and the refrigerating capacity and the refrigerating capacity are not uniform, so that it is stable for a long time. There is a drawback that you can not drive.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to use an HFC-based non-azeotropic refrigerant mixture which is non-flammable and has no risk of depleting the ozone layer, and the inlet and outlet of the heat exchange coil of the condenser. It is to provide a refrigerating apparatus which can be operated stably over a long period of time by making the composition of the refrigerant mixture uniform between the two or between the inlet and outlet of the heat exchange coil of the evaporator and reducing the temperature change. .

[0007]

Means for Solving the Problems As a result of intensive research conducted by the present inventor in view of the above problems, as a result of providing a means for mixing a refrigerant in a gas-liquid mixed state inside a heat exchange coil, the problems can be solved by mixing the refrigerant. They have found that they can be solved and have completed the present invention.

That is, the present invention comprises a condenser for condensing and liquefying a refrigerant, a capillary tube, an evaporator for evaporating a liquefied refrigerant, an accumulator, and a compressor for compressing the evaporated and vaporized refrigerant and discharging it to the condenser. In a refrigerating apparatus using an HFC-based non-azeotropic refrigerant mixture as a refrigerant compressed by a compressor, a means for mixing a refrigerant in a gas-liquid mixed state with a heat exchange coil of the condenser and / or a heat exchange coil of the evaporator. HFC characterized by having at least one
The present invention relates to a refrigerating apparatus using a non-azeotropic refrigerant mixture.

[0009]

In the present invention, the refrigerant mixture comprising a mixing member in which a member selected from a baffle plate, a perforated plate, a propeller, a static mixer, etc. is disposed inside the heat exchange coil of the condenser or the heat exchange coil of the evaporator. At least one means is provided at a suitable position between the inlet and the outlet of the heat exchange coil, and the refrigerant in the gas-liquid mixed state flowing in the heat exchange coil is mixed to thereby form a refrigerant mixture at the inlet and the outlet of the heat exchange coil. The change in composition can be minimized, and the change in temperature can be minimized. In the present invention, the location where the mixing member is arranged may be any location as long as it is a gas-liquid mixing section of the heat exchange coil and is not particularly limited.
The temperature, pressure, and refrigerant composition of the heat exchange coil can be appropriately determined so as to minimize the composition change of the refrigerant mixture between the inlet and the outlet of the heat exchange coil and minimize the temperature change. Specific examples of the location where the mixing member is provided include the central portion of the entire length from the inlet to the outlet of the heat exchange coil, the location ⅔ of the overall length from the inlet, or both locations. In the present invention, the refrigerating machine oil is not particularly limited. Mineral oil-based lubricating oil, alkylbenzene-based lubricating oil, ester-based lubricating oil, ether-based lubricating oil, or a mixture thereof can be preferably used.

[0010]

EXAMPLES The contents of the present invention will be described more specifically below with reference to examples, but the present invention is not limited to these contents. FIG. 1 shows the heat exchange coil 7 of the condenser 2 of the refrigeration system using the HFC-based non-azeotropic refrigerant mixture. Reference numeral 8 denotes a refrigerant inlet 8, and 9 denotes a refrigerant outlet. The arrow indicates the flow direction of the mixed refrigerant.

FIG. 2 shows a mixing member 1 in which a plurality of baffles 10a are arranged inside the heat exchange coil 7 at a position approximately half the total length from the inlet to the outlet of the heat exchange coil shown in FIG.
The example which provided 1a is shown. The arrow indicates the flow direction of the mixed refrigerant.

In FIG. 3, a mixing member 11b having a perforated plate 10b inside the heat exchange coil 7 is provided at a position of about half the total length from the inlet to the outlet of the heat exchange coil shown in FIG. Here is an example. The arrow indicates the flow direction of the mixed refrigerant.

FIG. 4 shows a mixing member 11 in which a propeller 10c is arranged inside the heat exchange coil 7 at a position about 2/3 of the total length from the inlet to the outlet of the heat exchange coil shown in FIG.
The example which provided c is shown. The arrow indicates the flow direction of the mixed refrigerant.

FIG. 5 shows a Kenix state consisting of a plurality of division plates 10d inside the heat exchange coil 7 at a position about 2/3 of the total length from the inlet to the outlet of the heat exchange coil shown in FIG. An example in which a mixing member 11d provided with an ick mixer is provided will be shown. The arrow indicates the flow direction of the mixed refrigerant. Dividing plate 1
The refrigerant is divided by 0d and mixed by changing the streamline, and the mixing proceeds in such a manner that it is folded in half each time it passes through one element.

In the present invention, since the refrigerant mixing means including the mixing members shown in FIGS. 2 to 5 is provided in the heat exchange coil 7 shown in FIG. 1, the gas phase of the refrigerant in the heat exchange coil 7 in the gas-liquid mixed state. And the liquid phase can be mixed well. as a result,
The composition change of the refrigerant mixture at the inlet 8 and the outlet 9 of the heat exchange coil 7 can be minimized and the temperature change can be minimized.

[0016]

INDUSTRIAL APPLICABILITY The refrigerating apparatus using the HFC-based non-azeotropic refrigerant mixture according to the present invention has no risk of depleting the ozone layer, and the non-flammable HFC-based non-azeotropic refrigerant mixture is used in the refrigeration cycle. Since the change in composition of the refrigerant mixture can be reduced, stable operation can be achieved for a long period of time. Since the composition change of the refrigerant mixture at the inlet and the outlet of the heat exchange coil of the condenser or the heat exchange coil of the evaporator can be minimized and the temperature change can be minimized, the design and performance of the heat exchange coil can be easily set.
Even if the refrigerant mixture leaks to the outside of the system during the refrigeration cycle operation, the composition of the refrigerant mixture is uniform regardless of the leak location, so that maintenance management is easy. The refrigerating apparatus of the present invention is economical because it has a simple structure, and has a large effect as described above and a high industrial utility value.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a heat exchange coil.

FIG. 2 is an explanatory cross-sectional view of a heat exchange coil provided with a refrigerant mixing member.

FIG. 3 is a cross-sectional explanatory view of a heat exchange coil provided with another refrigerant mixing member.

FIG. 4 is a cross-sectional explanatory view of a heat exchange coil provided with another refrigerant mixing member.

FIG. 5 is a cross-sectional explanatory view of a heat exchange coil provided with another refrigerant mixing member.

FIG. 6 is an example of a refrigeration circuit of a typical refrigeration system.

[Explanation of symbols]

 1 Compressor 2 Condenser 3 Dryer 4 Capillary tube 5 Evaporator 6 Accumulator 7 Heat exchange coil 8 Inlet 9 Outlet 10a Baffle plate 10b Perforated plate 10c Propeller 10d Dividing plate 11a, 11b, 11c, 11d Mixing member

Claims (5)

[Claims] 1. A condenser for condensing and liquefying a refrigerant, a capillary tube, an evaporator for evaporating a liquefied refrigerant, an accumulator, a compressor for compressing the evaporated vaporized refrigerant and discharging it to the condenser, and the like. In a refrigerating apparatus using an HFC-based non-azeotropic refrigerant mixture as the refrigerant to be used,
Refrigeration using an HFC-based non-azeotropic refrigerant mixture, characterized in that the heat exchange coil of the condenser and / or the heat exchange coil of the evaporator are provided with at least one means for mixing a refrigerant in a gas-liquid mixed state. apparatus. 2. The refrigerating apparatus according to claim 1, wherein the means comprises a mixing member in which a member selected from a baffle plate, a perforated plate, a propeller, and a static mixer is arranged in a heat exchange coil. 3. The refrigerating apparatus according to claim 1 or 2, wherein the means is provided so that a composition change of the refrigerant mixture at an inlet and an outlet of the heat exchange coil is minimized. 4. The refrigerating apparatus according to claim 1, wherein the means is provided so that the temperature difference between the inlet and the outlet of the heat exchange coil is minimized. 5. The refrigerating apparatus according to claim 1, wherein the refrigerating machine oil is a mineral oil type lubricating oil, an alkylbenzene type lubricating oil, an ester type lubricating oil, an ether type lubricating oil or a mixture thereof.