JPH07294047A - Air conditioner - Google Patents

Abstract

PURPOSE:To easily obtain an indoor temperature responsive to a resident's favorite or a temperature distribution by dividing an indoor heat exchanger into two, connecting the divided exchangers in series, and providing switching means for switching refrigerant introducing and discharging directions to and from both the exchangers. CONSTITUTION:An air conditioner has a refrigerant circuit having a compressor 1, an outdoor heat exchanger 6, a throttle 5, an indoor heat exchanger, etc., and sealing non-azeotropic refrigerant, in such a manner that the indoor exchanger is divided into a plurality and heat exchangers 3A, 3B are connected in series and comprises switching means (four-way valve) 8 for switching refrigerant introducing and discharging directions to and from the exchangers 3A, 3B. At the time of heating, the refrigerant is heated by the exchanger 3A, and then further heated by the exchanger 3B. Thus, when the exchanger 3A is installed in a room R1 and the exchanger 3B is installed in a room R2, the temperature in the room R1 can be set to a higher temperature than the temperature in the room R2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner containing a non-azeotropic mixed refrigerant.

[0002]

2. Description of the Related Art A refrigerant circuit diagram of a conventional air conditioner is shown in FIG. 4, and FIG. 5 shows a Mollier diagram of a non-azeotropic mixed refrigerant enclosed in the refrigerant circuit of this air conditioner. ing.

During heating operation of the air conditioner, the gas refrigerant discharged from the compressor 1 is a four-way valve 2 as indicated by a broken line arrow.
After entering the indoor heat exchanger 3 in the state of a, the heat is exchanged with the indoor air in the process of passing through the indoor heat exchanger 3 to be condensed and liquefied along the condensation line a to become the liquid refrigerant in the state of b.

This liquid refrigerant is throttled by the throttle 5 such as an expansion valve and adiabatically expanded along the expansion line (b) to become a gas-liquid two-phase refrigerant in the state of c. This gas-liquid two-phase refrigerant enters the outdoor heat exchanger 6 in the state of c, evaporates and vaporizes along the evaporation line c by exchanging heat with the outside air in the process of passing through this, and is the gas refrigerant in the state of d. Becomes

This gas refrigerant is sucked into the compressor 1 through the four-way valve 2 and compressed in the compressor 1 along the compression line 2 to be discharged in the state a.

During cooling operation of the air conditioner, by switching the four-way valve 2, the refrigerant circulates as indicated by the solid arrow, contrary to the above. In FIG. 5, E is a saturated vapor line, F is a critical point, G is a saturated liquid line, and J and L are isotherms.

The non-azeotropic mixed refrigerant is a mixture of two or more kinds of refrigerants having different boiling points, and in a gas-liquid two-phase state, the temperature of the refrigerant changes according to the change in dryness even under a constant pressure.
Therefore, during the cooling operation, the refrigerant at the inlet of the indoor heat exchanger 3 is on the isotherm, but the dryness increases as the refrigerant evaporates, and the temperature of the refrigerant rises accordingly. The refrigerant at the time of completion of evaporation is located on the isotherm H that is higher than the isotherm.

Further, during the heating operation, the refrigerant in the indoor heat exchanger 3 at the start of condensation is located on the isotherm line, but at the completion of condensation, the refrigerant is located on the isotherm line at a temperature lower than the isotherm line. .

[0009]

In the above conventional air conditioner, the temperature of the air blown out into the room after being heated or cooled by the indoor heat exchanger 3 becomes a substantially constant temperature. When both the person who likes warm and the person who likes cold are present in the room, there is a problem that the preferences of both persons cannot be satisfied at the same time.

[0010]

The present invention has been invented to solve the above-mentioned problems, and the gist of the first invention is to provide a compressor, an outdoor heat exchanger, a throttle, an indoor heat. In an air conditioner in which a non-azeotropic mixed refrigerant is sealed in a refrigerant circuit including an exchanger, the indoor heat exchanger is divided into two, and the divided heat exchangers are connected in series with each other. The air conditioner is characterized in that switching means for switching the inflow and outflow directions of the refrigerant to and from the two heat exchangers is provided.

The switching means may be a four-way switching valve.

The gist of the second invention is that a non-azeotropic mixed refrigerant is enclosed in a heat pump cycle in which a compressor, a cooling / heating switching four-way valve, a throttle and an indoor heat exchanger are connected in this order. In the heat pump type air conditioner configured as described above, the indoor heat exchanger is divided into a plurality of pieces, the plurality of divided heat exchangers are connected in series with each other, and the inflow / outflow direction of the refrigerant to the plurality of heat exchangers is switched An air conditioner characterized by having means.

[0013]

In the present invention, since the non-azeotropic mixed refrigerant flows through the plurality of divided heat exchangers in series, during the heating operation, the non-azeotropic mixed refrigerant passes through the upstream divided heat exchanger and is blown out into the room. The temperature of the blown air is higher than the temperature of the blown air that passes through the split heat exchanger on the downstream side and is blown out into the room, and during the cooling operation, it passes through the split heat exchanger on the upstream side and enters the room. The temperature of the blown air that is blown out is lower than the temperature of the blown air that flows through the split heat exchanger on the downstream side and is blown into the room.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT One embodiment of the present invention is shown in FIGS. As shown in the refrigerant circuit diagram of FIG. 1, the indoor heat exchanger is divided into a plurality (two in the figure), and the divided heat exchangers 3A and 3B are connected in series with each other. Further, a switching means 8 composed of a four-way valve for switching the inflow and outflow directions of the refrigerant to and from the heat exchangers 3A and 3B is provided. Other configurations are similar to those of the conventional one shown in FIG. 4, and corresponding members are designated by the same reference numerals.

During heating operation, the cooling / heating switching four-way valve 2 is switched as shown by the broken line in the figure. Then, when the switching means 8 is switched as shown by the broken line in the figure, the non-azeotropic mixed refrigerant discharged from the compressor 1 has the four-way valve 2, the switching means 8, the heat exchanger 3A, the heat exchanger 3B, Switching means 8, throttle 5, outdoor heat exchanger 6, cooling / heating switching four-way valve 2
And then returns to the compressor 1.

At this time, the heat exchangers 3A and 3B both function as condensers, and the non-azeotropic mixed refrigerant is used as the heat exchangers 3A and 3B.
Heat is radiated to the room air in the process of passing through the refrigerant to gradually condense and liquefy, but during this period, the dryness gradually decreases under a constant refrigerant condensing pressure.

Therefore, as shown in FIG. 2 (A), the heat exchanger
The temperature of the refrigerant at the outlet of 3A is located above the isotherm, while the temperature of the refrigerant at the outlet of the heat exchanger 3B is located above the isotherm that is lower than the isotherm.

As a result, the temperature of the air heated by passing through the heat exchanger 3A and blown out into the room is higher than the temperature of the air heated by passing through the heat exchanger 3B and blown out into the room. Get higher

However, as shown in FIG. 3 (A), when the heat exchangers 3A and 3B are installed on the wall W of the single room R with a space, the blowout airflow blown out from the heat exchanger 3A. The temperature of A can be made higher than the temperature of the blown airflow B blown from the heat exchanger 3B.

As shown in FIG. 3B, if the heat exchanger 3A is installed in the room R1 and the heat exchanger 3B is installed in the room R2, the room temperature in the room R1 can be higher than the room temperature in R2.

As shown in FIG. 3C, the heat exchangers 3A and 3B are installed in the ceiling-embedded air conditioner AC embedded in the ceiling S of the room R.
By disposing, the temperature of the blowout airflow A passing through the heat exchanger 3A can be made higher than the temperature of the blowout airflow B passing through the heat exchanger 3B.

Further, as shown in FIG. 3 (D), the air that has passed through the heat exchangers 3A and 3B of the ceiling-embedded air conditioner AC passes through the duct D and is installed in the ceiling S at the outlets 01 and 02. Can also be blown into the room R.

Further, as shown in FIG. 3 (E), the blowout airflows A and B passing through the heat exchangers 3A and 3B installed in the floor-standing air conditioner RAC can be blown out in different directions.

When the inflow and outflow directions of the refrigerant to and from the heat exchangers 3A and 3B are switched in the opposite direction by switching the switching means 8 as shown by the solid line, the gas refrigerant flows through the heat exchanger 3B, Since it flows through the heat exchanger 3A, the temperature of the blowout airflow B passing through the heat exchanger 3B can be made higher than the temperature of the blowout airflow A passing through the heat exchanger 3A.

During the cooling operation, the cooling / heating switching four-way valve 2 is switched as shown by the solid line. When the switching means 8 is switched as shown by the solid line, the non-azeotropic refrigerant discharged from the compressor 1 is shown by the solid arrow, the four-way valve 2, the outdoor heat exchanger 6, the throttle 5, the switching means. 8, heat exchanger 3
It returns to the compressor 1 through A, the heat exchanger 3B, the switching means 8, and the four-way valve 2 in this order.

At this time, the heat exchangers 3A and 3B both function as an evaporator, and the non-azeotropic refrigerant gradually evaporates by absorbing heat from the outside air while flowing through the heat exchangers 3A and 3B. During this period, the dryness gradually increases under a constant refrigerant evaporation pressure.

Therefore, as shown in FIG. 2 (B), the heat exchanger
The temperature of the refrigerant at the outlet of 3B is located on the isotherm, while the temperature of the refrigerant at the outlet of the heat exchanger 3A is located on the isotherm Y, which is lower than the temperature of the isotherm.

As a result, the temperature of the airflow B which is cooled by passing through the heat exchanger 3B and blown out into the room is the temperature of the airflow A which is cooled by passing through the heat exchanger 3A and blown out into the room. It will be lower than the temperature.

If the switching means 8 is switched in the opposite manner, the temperature of the blowout airflow B passing through the heat exchanger 3B can be made higher than the temperature of the blowout airflow A passing through the heat exchanger 3A.

In the above embodiment, two indoor heat exchangers are used.
Although it is divided into two, it is possible to divide them into a plurality and to connect them in series. In this case, the temperature of the blown airflow that has passed through the divided heat exchangers can be made different sequentially.

[0031]

According to the present invention, the temperatures of the air streams blown into the room through the divided heat exchangers can be made different from each other. Therefore, the room temperature according to the preference of the person in the room can be reduced. Alternatively, the temperature distribution can be easily obtained.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram of an air conditioner according to an embodiment of the present invention.

FIG. 2 is a Mollier diagram of the above embodiment, (A) shows a heating operation, and (B) shows a cooling operation.

3 (A), (B), (C), (D), and (E) are schematic configuration diagrams showing different installation procedures of the air conditioner according to the above embodiment.

FIG. 4 is a refrigerant circuit diagram of a conventional air conditioner.

FIG. 5 is a Mollier diagram of a conventional air conditioner.

[Explanation of symbols]

 1 compressor 2 four-way valve for switching between cooling and heating 6 outdoor heat exchanger 5 throttles 3A, 3B split heat exchanger 8 switching means

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location F25B 5/04 Z 6/04 Z 29/00 321

Claims (3)

[Claims] 1. An air conditioner in which a non-azeotropic mixed refrigerant is enclosed in a refrigerant circuit including a compressor, an outdoor heat exchanger, a throttle, an indoor heat exchanger, etc. An air conditioner characterized in that it is provided with a switching means for connecting the divided heat exchangers in series with each other and for switching the inflow and outflow directions of the refrigerant to and from the heat exchangers. 2. The air conditioner according to claim 1, wherein the switching means is a four-way switching valve. 3. A heat pump type air conditioner in which a non-azeotropic mixed refrigerant is enclosed in a heat pump cycle in which a compressor, a cooling / heating switching four-way valve, a throttle and an indoor heat exchanger are connected in this order, The indoor heat exchanger is divided into a plurality, the plurality of divided heat exchangers are connected in series with each other, and means for switching the inflow and outflow directions of the refrigerant to and from the plurality of heat exchangers are provided. Air conditioner.