JPH07294059A - Air conditioner - Google Patents

Abstract

PURPOSE:To provide a split type air conditioner in which an efficient operation can be executed by avoiding an operation for additionally reheating refrigerant while radiating by a condenser for reheating. CONSTITUTION:An air conditioner has a compressor 1, a condenser 5, a condenser flow control valve 10 sequentially located in series, a bypass flow rate control valve 9 connected in series with a series circuit of the condenser and the condenser flow control valve, a reheater 14a and an evaporator 14b for forming a refrigerating cycle for circulating refrigerant, and comprises a means for controlling a diffusing temperature of an indoor unit by controlling a flow rate of the refrigerant flowing through the valve 9 in response to a difference between the indoor temperature and a set temperature. Thus, an operation for additionally reheating the refrigerant while radiating by the condenser for reheating is avoided to perform an efficient operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner capable of dehumidifying operation.

[0002]

2. Description of the Related Art Generally, an air conditioner having a refrigeration cycle in which a compressor, a condenser, a condenser flow control valve, a reheater, and an evaporator are sequentially connected is known.

In this type, for example, the refrigerant that has passed through the condenser can be put into the reheater, and after radiating the heat there, it can be put into the evaporator to absorb the heat, so that it is directed from the evaporator to the reheater. There is a merit that so-called dehumidification with heating can be performed by sending air (for example, Japanese Patent Publication No. 2-43014).
Japanese Patent Publication No. 1-45532).

[0004]

However, in the prior art, since all the refrigerant discharged from the compressor always passes through the condenser, the heat is temporarily dissipated there. Even if the heat is introduced into the reheater, the amount of heat reheated there is not so large as compared with the amount of heat absorbed in the evaporator. In this case, there is a limit to dehumidification that tends to be heated.

For this reason, a device for heating the refrigerant is additionally provided in the outdoor unit, and the reheating amount is adjusted by the refrigerant heating device as needed.

However, in such a system, there is a problem that the efficiency is extremely low from an energy point of view, because heat is radiated by the condenser and is heated by the refrigerant heating device in order to supplement the amount of heat.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide an air conditioner capable of highly efficient operation.

[0008]

A first aspect of the present invention is an air conditioner having a refrigeration cycle in which a compressor, a condenser, a condenser flow control valve, a reheater and an evaporator are sequentially connected. And a bypass passage for bypassing the condenser flow control valve, a bypass flow control valve is provided in the bypass passage, and the valve opening degree of the bypass flow control valve is controlled according to the difference between the indoor temperature and the set temperature. A control means is provided.

A second aspect of the present invention is an air conditioner having a refrigeration cycle in which a compressor, a condenser, a condenser flow control valve, a reheater and an evaporator are sequentially connected, and the condenser and the condenser flow control are provided. A bypass passage for bypassing the valve is provided, a bypass flow rate control valve is provided in this bypass passage, and a setting means for setting the indoor blowout temperature according to the difference between the room temperature and the set temperature is provided, and the setting is performed according to this setting means. Control means for controlling the valve opening degree of the bypass flow rate control valve according to the blowout temperature is provided.

A third aspect of the invention is an air conditioner having a refrigeration cycle in which a compressor, a condenser, a condenser flow control valve, a reheater and an evaporator are sequentially connected, and the condenser and the condenser flow control are provided. A bypass passage for bypassing the valve is provided, a bypass flow rate control valve is provided in the bypass passage, a refrigerant heater connected to the compressor is further provided, the condenser flow rate control valve is closed, and the bypass flow rate control valve is opened. It is characterized in that a control means for operating the refrigerant heater is provided.

A fourth invention is an air conditioner having a refrigeration cycle in which a compressor, a condenser, a condenser flow control valve, a reheater and an evaporator are sequentially connected, and the condenser and the condenser flow control are provided. A bypass passage for bypassing the valve is provided, a bypass flow rate control valve is provided in the bypass passage, and an expansion valve is provided between the reheater and the evaporator, and when the bypass flow rate control valve is closed. It is characterized in that control means for controlling the opening degree of the expansion valve and the condenser flow control valve in association with each other is provided.

[0012]

According to the first aspect of the invention, the amount of the refrigerant flowing through the bypass flow rate control valve is controlled according to the difference between the indoor temperature and the set temperature to control the indoor blowout temperature of the indoor unit. The ratio of the amount of heat and the amount of heat radiated from the outdoor unit can be changed significantly, and the indoor blowout temperature can be controlled so that it can be continuously adjusted from cooling to dehumidifying to cooling, to dehumidifying to heating, and there is no unnecessary heat dissipation in terms of energy. It can be operated with high efficiency.

According to the second aspect of the invention, the indoor blowout temperature of the indoor unit is set according to the difference between the indoor temperature and the set temperature, and the amount of refrigerant flowing through the bypass flow control valve is controlled.
The ratio of indoor heat dissipation to outdoor unit heat dissipation can be changed significantly,
The indoor blowout temperature can be controlled so as to be continuously adjustable from cooling to cooling-like dehumidification to heating-like dehumidification, and there is no unnecessary heat release in terms of energy, and it is possible to operate with high efficiency.

According to the third invention, the compressor, the condenser, and the condenser flow control valve are arranged in series in this order, and the bypass flow control valve is connected in parallel to the series circuit of the condenser and the condenser flow control valve. , The refrigerant heating device is provided in series with the compressor, and the refrigerant is heated when the refrigerant is not circulated in the condenser, so when the heating capacity is insufficient, the refrigerant heater heats the refrigerant to provide strong heating. be able to.

According to the fourth aspect of the present invention, the heat radiation amount of the reheater and the heat absorption amount of the evaporator can be continuously adjusted by adjusting the openings of the expansion valve and the condenser flow control valve, and the efficiency is high. You can drive.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to FIG.

In FIG. 1, the separation type air conditioner includes an outdoor unit (outdoor unit) 15 and an indoor unit (indoor unit) 1.
Have six.

First, the outdoor unit 1 of the separation type air conditioner.
5 will be described.

The outdoor unit 15 includes a compressor 1, a condenser 5, a blower 6, a condenser flow control valve 10, a bypass flow control valve 9 and the like.

The condenser 5 and the condenser flow control valve 10 are connected in series to the compressor 1 in order. On the other hand, the bypass flow rate control valve 9 includes the condenser 5 and the condenser flow rate control valve 10.
Are connected in parallel to the series circuit.

The bypass flow control valve 9 bypasses the condenser 5 and the condenser flow control valve 10.
It is provided in. Further, the blower 6 blows air to the condenser 5 along the arrow W2 direction.

In the outdoor unit 15, the operation of the blower 6 for the condenser and the flow control valve 1 are preferably carried out via the control section.
It is adapted to control the operation of zero.

Next, the indoor unit 1 of the separation type air conditioner
6 will be described.

The indoor unit 16 has a reheater 14a, an expansion valve 11 and an evaporator 14b. An expansion valve 11, which is also called a flow rate control valve, is arranged between the reheater 14a and the evaporator 14b. That is, the reheater 14a, the expansion valve 11, and the evaporator 14b are sequentially arranged in series from the pipe 18. The evaporator 14b is connected to the pipe 17.

A blower 19 is arranged in the indoor unit 16. The blower 19 is for blowing air to the reheater 14a and the evaporator 14b in the arrow W1 direction.

Next, a preferred example of the control method of the illustrated separation type air conditioner will be described.

In the separation type air conditioner of the embodiment of FIG. 1, the controller 30 changes the flow rate of the refrigerant flowing through the condenser flow rate control valve 10 and the bypass flow rate control valve 9 to thereby radiate the heat Qc in the outdoor unit 15. change. As a result, the indoor unit 1
The ratio of the heat radiation amount in 6 and the heat radiation amount in the outdoor unit 15 can be greatly changed.

Before describing this, first, the flow of the refrigerant during the normal cooling operation, the cooling operation with dehumidification, and the heating operation will be described.

In the normal cooling operation, the bypass flow rate control valve 9 in FIG. 5 is closed and the condenser flow rate control valve 10 is slightly throttled.

In the normal cooling operation (forced cooling operation), the refrigerant flows in the direction shown by the broken line arrow in FIG. The refrigerant from the compressor 1 passes through the condenser 5 and the condenser flow control valve 10,
The refrigerant is throttled by the condenser flow control valve 10, and the reheater 1
At 4a, some of the refrigerant took away latent heat and evaporated (endotherm Q
After r), latent heat is taken by the remaining radiator 14b by the fully open expansion valve 11 to evaporate (heat absorption amount Qe). Therefore, after the air is cooled by both the evaporator 14b and the reheater 14a, it is blown indoors. FIG. 6 shows a Mollier diagram in the normal high-power cooling operation.

Next, in the cooling operation with dehumidification shown in FIGS. 1 and 2, the condenser flow control valve 10 and the bypass flow control valve 9 are
And the expansion valve 11 is throttled. As a result, the refrigerant circulates in the same manner as in the normal cooling operation described above, but some refrigerant passes through the condenser 5 and the bypass passage 40. By bypassing the condenser 5 with a part of the refrigerant from the compressor 1, the heat radiation amount Qr in the reheater 14a can be adjusted and the thermal loss can be reduced. The refrigerant radiates heat in the reheater 14a (heat radiation amount Qr) and absorbs heat in the evaporator 14b (heat absorption amount Qe).
To do.

During dehumidifying and cooling, as shown in the Mollier diagram of FIG. 2 (from dehumidifying from cooling to dehumidifying to heating), the evaporator 1
A heat amount Qc of the outdoor unit 15 is radiated as a heat amount obtained by adding the heat amount of the refrigerant in the compressor 1 to the evaporation heat amount Qe of 4b, and the remaining heat amount Qr is the reheater of the indoor unit 16. Move to 14a. Therefore, the indoor unit 1
The air dehumidified and cooled by the evaporator 14b of No. 6 is supplied to the reheater 14
In b, it is heated by the remaining heat amount Qr, blown out into the room, and is dehumidified and cooled.

At this time, the amount of heat Qc radiated by the condenser 5 of the outdoor unit 15 is adjusted by adjusting the opening degree of the bypass flow control valve 9 so that the refrigerant circulating amount flowing through the condenser 5 and the condenser 5 are bypassed. Bypass flow control valve 9 without radiating heat
By adjusting the circulation amount of the refrigerant flowing into the reheater 14a of the indoor unit 16 via the heat exchanger, the heat radiation amount Qc of the refrigerant in the condenser 5 of the outdoor unit 15 can be adjusted, and the fine humidity and the temperature can be adjusted. It becomes possible to control.

For example, by closing the flow control valve 10 and causing all the refrigerant to flow to the flow control valve 9 side, the heat radiation amount Qc in the condenser 5 of the outdoor unit 15 can be reduced to zero, which is extremely wide. The heat radiation amount Qc of the condenser 5 can be changed.

Therefore, the reheater 1 of the indoor unit 16
The ratio of the heat radiation amount in 4a and the heat radiation amount in the condenser 5 of the outdoor unit 15 can be largely changed.

To increase the outdoor heat radiation amount Qc by decreasing the opening of the flow control valve 9 and decreasing the flow rate of the refrigerant passing through the bypass 40 (by increasing the flow rate of the refrigerant flowing through the condenser 5). Thus, the amount of heat used for reheating the room by the reheater 14a is reduced.

Therefore, the temperature at which the indoor air is blown out is lowered, and the air is dehumidified with cooling.

That is, when the room temperature is higher than the set temperature, the refrigerant circulation amount flowing through the flow rate control valve 9 is reduced (the refrigerant circulation amount flowing through the condenser 5 is increased), and the reheater 14a is used to reheat the inside of the room. Decrease the heating amount and perform a dehumidifying operation with a slight cooling effect.

Next, the case of the heating dehumidifying operation will be described.

The flow of the refrigerant in this case is the same as that in the cooling operation as shown by the broken line in FIG. 1, but the flow control valve 9
Is increased to increase the flow rate of the refrigerant passing through the bypass flow rate control valve 9 in the bypass 40 (condenser 5
(By reducing the flow rate of the refrigerant flowing through), the outdoor heat radiation amount Qc is reduced, and the heat amount Qr used for indoor reheating by the reheater 14a is increased. Therefore, the indoor air blowing temperature becomes high, and the heating dehumidification is performed.

That is, when the indoor temperature is lower than the set temperature, the refrigerant circulation amount flowing through the bypass flow rate control valve 9 is increased (the refrigerant circulation amount flowing through the condenser 5 is decreased), and the indoor temperature by the reheater 14a is increased. The reheating amount Qr is increased and the heating dehumidifying operation is performed.

In this way, the room temperature can be adjusted to the set temperature while dehumidifying.

Next, in the normal heating operation, the flow of the refrigerant is opposite to that in the cooling operation shown in FIG. That is, the refrigerant is the evaporator 14
b, the reheater 14 a, the condenser flow control valve 10, and the condenser 5 to return to the compressor 1.

When performing the heating-like dehumidifying operation or the cooling-like dehumidifying operation shown in FIG. 1 as described above, the bypass flow rate control valve 9 is operated according to the difference between the measured current indoor temperature and the set temperature. Control the amount of refrigerant flowing through. As a result, the blowing temperature of the blowing fan 20 of the indoor unit 16 in FIG. 1 can be adjusted, and the indoor comfort can be further improved.

Alternatively, a table (experimental data) showing the relationship between the blown air amount and the refrigerant ratio of the indoor unit 16 in FIG. 1 is prepared in advance, and when performing heating dehumidifying operation or cooling taste dehumidifying operation, etc. The blowoff temperature can be set based on the table (experimental data) according to the difference between the measured current indoor temperature and the set temperature that has been set, and the bypass flow control valve 9 can be controlled by this blowout temperature.

With this method, the amount of the refrigerant flowing through the bypass flow control valve 9 can be controlled to adjust the blowout temperature of the blowout fan 20 of the indoor unit 16 shown in FIG. 1, and the indoor comfort can be improved.

Further, in the case where the above heating operation mode is changed to the strong heating dehumidification shown in FIGS. 3 and 4,
As shown in FIGS. 3 and 4, when the heating capacity is insufficient even when the refrigerant does not flow into the condenser 5, as shown in FIG.
It is possible to additionally heat the refrigerant by the refrigerant heating device 30 to further increase the amount of reheating of the refrigerant, and perform more powerful heating as compared with an air conditioner equipped with a conventional refrigerant heating device. As described above, in the embodiment of the present invention, the heating capacity is increased by the amount of heat radiated by the conventional condenser, and the energy use efficiency is improved, as compared with the conventional method. The Mollier diagram in the case of this strong heating dehumidification is shown in FIG.

When the cooling capacity is further increased from the above cooling mode, the bypass flow control valve 9 is fully closed and the opening degree of the expansion valve 11 is increased, as shown in FIGS. 5 and 6. By reducing the opening degree of the condenser flow control valve 10, the pressure of the reheater 14a decreases and the reheater 14a
The amount of heat radiation at a is reduced. If you proceed with this, reheater 1
4a becomes a low pressure side and changes to a cooler to increase the cooling capacity (the condenser flow control valve 10 changes to the operation as an expansion valve).

As described above, in the air conditioner of the present invention, it is possible to stably adjust the reheat amount in a wide range irrespective of the dehumidifying amount, and from the cooling to the cooling dehumidifying, the heating dehumidifying dehumidifying, and the heating strong. The operation can be continuously adjusted until the dehumidifying operation, and there is no unnecessary heat dissipation in terms of energy, the heat of all the refrigerants can be used, and economical operation is possible.

Next, an example of control of the condenser flow control valve 10 and the bypass flow control valve 9 based on the difference between the present room temperature T1 and the set temperature T2 will be described with reference to FIGS.

First, referring to FIG.

In the control example of FIG. 7, the amount of the refrigerant flowing through the bypass flow rate control valve 9 is controlled according to the difference between the detected room temperature T1 and the room temperature set temperature T2 to control the room blowout temperature T4, and yet the strength is strong. An example in which the refrigerant is heated by the refrigerant heating device 30 in FIG. 3 when the refrigerant is not circulated in the condenser 5 in the heating dehumidifying operation is shown.

In FIG. 7, the room temperature T1 is detected, and the detected room temperature T1 is compared with the room set temperature T2 to obtain the temperature difference. Then, the temperature difference is compared with the fully closed comparison signal RS of the condenser flow control valve 10 to control the refrigerant heating amount by the refrigerant heating device 30 of FIG. Further, the opening of the condenser flow control valve 10 is adjusted by this temperature difference.
Further, the temperature difference is compared with the reference opening degree of the bypass flow rate control valve 9 to adjust the opening degree of the bypass flow rate control valve 9.

Next, refer to FIG.

In the control example of FIG. 8, the indoor blowout temperature T3 is set based on a predetermined table (experimental data) according to the difference between the indoor temperature and the set temperature, and the bypass flow control valve 9 is set.
An example in which the refrigerant is heated by the refrigerant heating device 30 of FIG. 3 when the amount of the refrigerant flowing through the refrigerant is controlled and when the refrigerant is not circulated through the condenser 5 in the powerful heating dehumidifying operation is shown.

In FIG. 8, the room temperature T1 is detected, and the detected room temperature T1 is compared with the set temperature T2 to obtain the temperature difference. Then, this temperature difference is compared with the indoor blowout temperature T3 based on the table (experimental data) to obtain the difference.

This temperature difference is compared with the fully closed comparison signal RS of the condenser flow control valve 10 to control the refrigerant heating amount by the refrigerant heating device 30 of FIG. Further, the opening of the condenser flow control valve 10 is adjusted by this temperature difference. further,
The opening of the bypass flow control valve 9 is adjusted by comparing the temperature difference with the reference opening of the bypass flow control valve 9.

Further, referring to FIG.

In the control example of FIG. 9, the room temperature T1 is detected,
Moreover, the temperature difference between the detection chamber temperature T1 and the set temperature T2 is calculated.

Then, the bypass flow rate control valve 9 is fully closed, the opening degree of the expansion valve 11 of the indoor unit 16 is adjusted by this temperature difference, and this temperature difference is compared with the reference opening degree of the flow rate adjusting valve 10 to condense. The opening degree of the instrument flow control valve 10 is adjusted. This allows continuous adjustment from the forced heating / dehumidifying operation to the cooling operation.

In FIG. 9, the room temperature T1 is detected, and the room temperature T1 is compared with the set temperature T2 to obtain the temperature difference. The temperature difference controls the opening degree of the expansion valve 11 of the indoor unit 16, and the temperature difference and the condenser flow control valve 10 are controlled.
The reference opening of the condenser flow control valve 10 is compared to adjust the opening of the condenser flow control valve 10.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified without departing from the spirit of the present invention.

[0063]

As described above, according to the present invention, the compressor, the condenser, and the condenser flow control valve are sequentially arranged in series,
By connecting the bypass flow control valve in parallel to the series circuit of the condenser and the condenser flow control valve, and controlling the amount of refrigerant flowing through the bypass flow control valve according to the difference between the room temperature and the set temperature, the indoor unit indoor Since the blowout temperature is controlled, the ratio of the indoor heat radiation amount to the outdoor unit heat radiation amount can be greatly changed, and the indoor blowing temperature can be controlled so that it can be continuously adjusted from cooling to cooling dehumidification and heating dehumidification, and There is no unnecessary heat release in terms of energy, and it is possible to operate with high operating efficiency.

Further, according to the present invention, the indoor blowing temperature of the indoor unit is set according to the difference between the indoor temperature and the set temperature, and the amount of the refrigerant flowing through the bypass flow control valve is controlled according to the set temperature. Therefore, it is possible to greatly change the ratio between the indoor heat radiation amount and the outdoor unit heat radiation amount, and it is possible to control the indoor blowing temperature so that it can be continuously adjusted from cooling to cooling dehumidification and heating dehumidification, and energy consumption can be controlled. It is possible to operate with high efficiency without unnecessary heat dissipation.

Further, according to the present invention, when the refrigerant heating device is provided in series with the compressor and the refrigerant is not circulated in the condenser,
Since the refrigerant is heated, it is possible to continuously adjust from cooling to dehumidifying for cooling, dehumidifying for heating, and dehumidifying for intense heating, and it is possible to operate with high efficiency.

Further, according to the present invention, the compressor, the condenser, and the condenser flow control valve are sequentially arranged in series, and the bypass flow control valve is connected in parallel to the series circuit of the condenser and the condenser flow control valve. By fully closing the bypass flow control valve and adjusting the opening of the expansion valve and condenser flow control valve, it is possible to continuously adjust from the dehumidifying operation to the cooling operation. The rate of heat radiation of the machine can be changed greatly, it is possible to continuously adjust from cooling to dehumidifying to cooling, to dehumidifying to heating, and there is no unnecessary heat radiation in terms of energy.
It can be operated with high efficiency.

[Brief description of drawings]

FIG. 1 is a diagram showing a pipe system (cooling dehumidifying to heating dehumidifying operation) of a preferred embodiment of an air conditioner of the present invention.

FIG. 2 is a diagram showing an example of the Mollier diagram in FIG. 1 (from cooling dehumidifying to heating dehumidifying operation).

FIG. 3 is a diagram showing a piping system (powerful heating dehumidifying operation) of a preferred embodiment of the air conditioner of the present invention.

FIG. 4 is a diagram showing an example of a Mollier diagram (strong heating dehumidifying operation) in FIG. 3.

FIG. 5 is a diagram showing a piping system (strong cooling operation) of a preferred embodiment of the air conditioner of the present invention.

FIG. 6 is a diagram showing an example of the Mollier diagram (strong cooling operation) in FIG.

FIG. 7 is a diagram showing a control example in the present invention.

FIG. 8 is a diagram showing a control example in the present invention.

FIG. 9 is a diagram showing a control example in the present invention.

[Explanation of symbols]

 1 Compressor 5 Condenser 9 Bypass flow control valve 10 Condenser flow control valve 14a Reheater 14b Radiator 15 Outdoor unit 16 Indoor unit

Claims (4)

[Claims] 1. An air conditioner having a refrigeration cycle in which a compressor, a condenser, a condenser flow control valve, a reheater and an evaporator are sequentially connected, wherein the condenser and the condenser flow control valve are bypassed. Is provided with a bypass passage, a bypass flow rate control valve is provided in the bypass passage, and control means is provided for controlling the valve opening degree of the bypass flow rate control valve according to the difference between the room temperature and the set temperature. Air conditioner. 2. An air conditioner having a refrigeration cycle in which a compressor, a condenser, a condenser flow control valve, a reheater and an evaporator are sequentially connected, wherein the condenser and the condenser flow control valve are bypassed. A bypass passage is provided, a bypass flow rate control valve is provided in the bypass passage, and setting means for setting the indoor blowing temperature according to the difference between the indoor temperature and the set temperature is provided, and the blowing temperature set according to the setting means. An air conditioner comprising control means for controlling a valve opening degree of the bypass flow control valve according to the above. 3. An air conditioner having a refrigeration cycle in which a compressor, a condenser, a condenser flow control valve, a reheater and an evaporator are sequentially connected, wherein the condenser and the condenser flow control valve are bypassed. A bypass passage is provided, a bypass flow control valve is provided in the bypass passage, a refrigerant heater connected to the compressor is further provided, and the condenser flow control valve is closed and the bypass flow control valve is opened. An air conditioner comprising control means for operating a refrigerant heater. 4. An air conditioner having a refrigeration cycle in which a compressor, a condenser, a condenser flow control valve, a reheater and an evaporator are sequentially connected, wherein the condenser and the condenser flow control valve are bypassed. A bypass passage is provided, a bypass flow control valve is provided in the bypass passage, an expansion valve is provided between the reheater and the evaporator, and the expansion valve is provided when the bypass flow control valve is closed. An air conditioner provided with a control means for controlling the opening degree of the condenser flow control valve in association with each other.