JPH08157810A - Control of composition change during transfer of mixed liquid of non-azeotropic cooling medium - Google Patents

Abstract

PURPOSE: To provide the subject controlling method useful for filling a cooling medium into a cylinder at a cooling-medium manufacturer, filling the cooling medium into an air conditioning machine at an air-conditioning-machine manufacturer, as well as useful in the field of filling the medium from a service can to the air conditioning machine during repairing or during the supplementation of leakage. etc. CONSTITUTION: A non-azeotropic cooling-medium mixture filled in the first cooling-medium container and consisting of R32, R125 and R134a is dividedly transferred into at least two of the second cooling-medium containers. The objective composition change-controlling method during the transferring of the non-azeotropic cooling-medium mixture comprises a process in which the composition of R32 and R125 in the mixed liquid filled in the first cooling- medium container is respectively adjusted to 23.4-24.0wt.% and 25.2-26.0wt.% before the first turn of transferring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting the compositional change when a non-azeotropic refrigerant mixed liquid is refilled within a certain range.

[0002]

2. Description of the Related Art In recent years, due to the environmental problem of ozone layer depletion due to the influence of chlorofluorocarbons, it has been decided to abolish chlorofluorocarbons by the end of 1995. In addition, hydrochlorofluorocarbons, which have little influence on the destruction of the ozone layer, will eventually be completely abolished. Therefore, as a substitute refrigerant for these chlorofluorocarbons or hydrochlorofluorocarbons, it is difficult to substitute a single-component refrigerant or an azeotropic refrigerant, so that the adoption of a non-azeotropic mixed refrigerant has become effective.

With respect to the single-component or azeotropic refrigerants that have been used up to now, there is no change in the composition. Therefore, there is a technique for adjusting the composition change especially in the gas phase filling or the liquid phase filling at the time of transfer filling. I didn't need it.

[0004]

A similar filling method to a single component can be considered when filling a non-azeotropic mixed refrigerant, but at that time, a component having a low boiling point selectively evaporates to the gas phase side.
An accurate liquid composition cannot be filled by the vapor phase filling method.
On the other hand, even in the liquid-phase filling method, the volume of the gas phase in a refrigerant container such as a cylinder increases with transfer and the low boiling point components are selectively vaporized to the gas phase side, resulting in a change in the liquid composition. There is a problem that it will end up. Therefore, when the refrigerant is filled in the refrigerant container in the air conditioner, the composition of the refrigerant changes one by one, which makes it difficult for all the air conditioners to exhibit the same refrigerating capacity. Further, due to this change in composition, it is uneconomical because all the refrigerant in the cylinder cannot be used up.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a method for adjusting the composition change when a non-azeotropic refrigerant mixed liquid is refilled.

That is, according to the present invention, difluoromethane (R32), 1, 1, 1, filled in the first refrigerant container is used.
2,2-pentafluoroethane (R125) and 1,
When separately transferring the non-azeotropic refrigerant mixture liquid consisting of 1,1,2-tetrafluoroethane (R134a) to two or more second refrigerant containers, the first transfer is performed prior to the first transfer.
R32 and R in the mixed liquid filled in the refrigerant container of
The mixed liquid composition of 125 is R32 = 23.4 to 24.0 wt.
% And R125 = 25.2 to 26.0 wt%, the mixed liquid composition in the transferred second refrigerant container is R32 / R125 / R134a = 23 ± 1/25 ± 2 /
It is a composition change adjusting method at the time of refilling a non-azeotropic refrigerant mixed liquid, which is characterized in that it is adjusted to a range of 52 ± 2 wt%.

R32 / R125 / R134a = 23/2
A non-azeotropic mixed refrigerant composed of 5/52 wt% is drawing attention as an alternative refrigerant for chlorodifluoromethane. In order to maintain the characteristics of the air conditioner and the like, this non-azeotropic refrigerant mixed liquid is used as R32 / R125 / R134 in the refrigerant container in the air conditioner.
It is necessary to maintain and manage so that a = 23 ± 1/25 ± 2/52 ± 2 wt%.

The above non-azeotropic refrigerant mixture liquid is transferred from a first refrigerant container such as a cylinder to two or more second refrigerant containers, for example, a service can or the like, or the first refrigerant such as a cylinder or a service can. The container may be refilled with two or more second refrigerant containers, for example, a refrigerant container in an air conditioner. in this case,
The non-azeotropic refrigerant mixed liquid in the cylinder or the service can is usually used up by transferring and filling a plurality of times instead of using it up in a single operation.

If the operation is not performed once, the above-mentioned problem that the composition of the non-azeotropic refrigerant mixed liquid varies occurs. Prior to the first transfer and filling, R32 and R1 in the non-azeotropic refrigerant mixed liquid filled in a refrigerant container such as a cylinder or a service can.
The mixed liquid composition of 25 is R32 = 23.4 to 24.0 wt%
And by setting R125 = 25.2 to 26.0 wt%, it is possible to adjust the composition variation due to the multiple transfer filling.

According to the method of the present invention, when a refrigerant manufacturer transfers and fills one cylinder to two or more other cylinders or service cans, when an air conditioner manufacturer fills the refrigerant from one cylinder to two or more air conditioners, Alternatively, it can be preferably used when repairing or leaking, when filling a refrigerant from one service can into two or more air conditioners.

[0011]

EXAMPLES Examples 1 and 2 below are examples, and Example 3 is a comparative example.

"Example 1" R32 / R125 / R134a =
9 liters of a 10 liter original cylinder was filled with a refrigerant having a composition of 23.4 / 26.0 / 50.6 (wt%), and 0.9 liters was added from this original cylinder to a 1 liter child cylinder by the liquid phase filling method. Transfer and filling were performed one by one.

Analysis of the liquid composition of the child cylinders transferred and filled revealed that the compositions of R32, R125 and R134a were all within the ranges of 23 ± 1, 25 ± 2 and 52 ± 2 wt%.

"Example 2" R32 / R125 / R134a =
9 liters of a 10 liter original cylinder was filled with a refrigerant having a composition of 24.0 / 25.2 / 50.8 (wt%), and 0.9 liter was added from this original cylinder to a 1 liter child cylinder by a liquid phase filling method. Transfer and filling were performed one by one.

When the liquid composition of the transfer-filled cylinder was analyzed, the compositions of R32, R125 and R134a were in the range of 23 ± 1, 25 ± 2 and 52 ± 2 wt% in all cases.

"Example 3" R32 / R125 / R134a =
A 10-liter original cylinder was filled with 9 liters of a refrigerant having a composition of 23/25/52 (wt%), and 0.9 liters were transferred from this original cylinder to a 1-liter sub-cylinder by a liquid phase filling method. .

Analysis of the liquid composition of the transfer-filled subsidiary cylinder revealed that R3 in the 9th and last packed subsidiary cylinders was analyzed.
2, the composition of R125 and R134a is 23 ± 1,25
It was not within the range of ± 2 and 52 ± 2 wt%.

[0018]

According to the present invention, the composition change can be adjusted when the non-azeotropic mixed refrigerant is refilled. This method can be used in fields such as cylinder filling by a refrigerant manufacturer, refrigerant filling in an air conditioner by an air conditioner manufacturer, repair, and filling from a service can into an air conditioner at the time of leakage.

Claims (3)

[Claims] 1. Difluoromethane (R32), 1,1,1,2,2-pentafluoroethane (R125) and 1,1,1,2-tetrafluoroethane (R134a) filled in a first refrigerant container. ), The non-azeotropic refrigerant mixture liquid is divided into two or more second refrigerant containers and transferred,
Prior to the first transfer and filling, the composition of the mixed solution of R32 and R125 in the mixed solution filled in the first refrigerant container was changed to R
32 = 23.4 to 24.0 wt% and R125 = 2
By setting it to be 5.2 to 26.0 wt%, the mixed liquid composition in the transferred second refrigerant container becomes R32 / R125 / R.
134a = 23 ± 1/25 ± 2/52 ± 2 wt%, a composition change adjusting method at the time of refilling a non-azeotropic refrigerant mixed liquid, characterized in that it is adjusted to fall within a range of 23 ± 1/25 ± 2/52 ± 2 wt%. 2. The method of claim 1, wherein the first refrigerant container is a cylinder or a service can. 3. The method of claim 1, wherein the second refrigerant container is a refrigerant container in an air conditioner.