JP2531332B2 - Dehumidifying operation method of air conditioner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has at least a compressor, a condenser, an expansion device and an evaporator, and is provided with a refrigerant circuit for circulating a refrigerant, and performs dehumidification operation in addition to cooling operation and heating operation. The present invention relates to a dehumidifying operation method for an air conditioner.

[0002]

2. Description of the Related Art Conventionally, air conditioners are roughly classified into a compressor, a condenser, an expansion device and an evaporator, and a refrigeration cycle for circulating a refrigerant, a heat source device, a circulation pump, a radiator and a hot water valve. There are often used those having a hot water circulation circuit, or those adopting a heat pump system only in a refrigeration cycle in which a refrigerant is circulated. Such an air conditioner can perform a dehumidifying operation that lowers the humidity in addition to the cooling operation and the heating operation, and switches to the dehumidifying operation when the indoor temperature reaches the set temperature during the cooling operation or the heating operation. When the difference between the room temperature and the set temperature becomes equal to or more than the predetermined value during the dehumidifying operation, the cooling operation or the heating operation is started.

For example, the one described in Japanese Patent Laid-Open No. 2-103330 has a refrigeration cycle and a hot water circulation circuit, operates only the refrigeration cycle during cooling operation, and operates only the hot water circulation circuit during heating operation. During the dehumidification operation, the refrigeration cycle and the hot water circulation circuit are operated at the same time.In the dehumidification operation, the indoor ventilation is weak, the refrigeration cycle is constantly operated, and the hot water valve opening of the hot water circulation circuit is adjusted. By adjusting the heating amount, it is intended to keep the room temperature appropriate. Moreover, what was described in Unexamined-Japanese-Patent No. 3-260539 is a compressor, a four-way valve, an outdoor heat exchanger,
In the heat pump type air conditioner consisting of a refrigeration cycle including an expansion device, an indoor heat exchanger, and a reheater, the indoor temperature detecting means and the indoor humidity detecting means are provided, and after the dehumidifying operation, the indoor temperature and humidity are When the temperature is within the predetermined range, the monitoring mode is entered, the compressor is turned off, and the heating of the reheater is turned off, thereby preventing an excessive decrease in humidity. In an air conditioner including a refrigeration cycle and a hot water circulation circuit, the compressor is turned off in the monitoring mode, and the hot water valve is fully closed to control the room temperature and humidity.

[0004]

However, in the above-described conventional dehumidifying operation method for the air conditioner, when the dehumidifying operation is performed while the refrigerating cycle is constantly operated, the indoor temperature is adjusted, but the refrigerating cycle is always operated. Since it is in operation, there was a risk that the humidity would drop excessively. Also, the one that detects the humidity shifts to the monitoring mode by stopping the circulation of the refrigerant and the circulation of the hot water during the dehumidifying operation, but when returning from the monitoring mode to the dehumidifying operation, the opening degree of the hot water valve is predetermined. Since the dehumidifying operation is restarted at a predetermined opening, an appropriate hot water flow rate, that is, a heating amount may not always be obtained due to disturbances such as fluctuations in cooling capacity, fluctuations in hot water pressure due to outdoor temperature, fluctuations in hot water temperature, etc. If the hot water flow rate (heating amount) is too small for the cooling capacity, the room temperature drops and the heating operation is performed, or the heating dehumidification operation with increased heating capacity (hereinafter referred to as heating dehumidification mode). When the indoor temperature rises and reaches the set temperature, the dehumidification operation is resumed (see Fig. 5). Conversely, if the hot water flow rate (heating amount) is excessive with respect to the cooling capacity, the indoor temperature Rises to cooling operation, or When the temperature shifts to a dehumidifying operation with a higher cooling capacity (hereinafter referred to as "cooling dehumidifying mode") and the indoor temperature drops and reaches the set temperature, the dehumidifying operation is resumed. Therefore, there is a problem that it is difficult to perform an efficient dehumidifying operation.

An object of the present invention is to provide a dehumidifying operation method for an air conditioner, which is capable of performing stable dehumidifying operation while performing stable indoor temperature control.

[0006]

To achieve the above object, a dehumidifying operation method for an air conditioner according to the present invention is a refrigeration cycle having a compressor, a condenser, an expansion device and an evaporator, a heat source device and a circulation pump. In an air conditioner equipped with a hot water valve for controlling the flow rate of hot water, a hot water circulation circuit having a radiator, an indoor temperature detecting means, and an indoor humidity detecting means, the refrigeration cycle is operated when the indoor temperature is equal to or higher than the cooling set temperature. When the room temperature is below the heating set temperature, the hot water circulation circuit is operated, and when the room temperature is between the cooling set temperature and the heating set temperature, the indoor humidity exceeds the set value. The dehumidifying operation in which the refrigeration cycle and the hot water circulation circuit are operated at the same time is performed, and when the indoor humidity is below the set value, the refrigeration cycle and the hot water circulation circuit are stopped. The method, when moving the dehumidifying operation from a monitoring mode, in which to start the dehumidifying operation in the hot water valve opening during dehumidifying operation end before moving to the monitoring mode.

[0007]

[Function] The cooling capacity is set by changing the opening degree of the hot water valve at the time of shifting from the monitoring mode to the dehumidifying operation to the warm water valve opening degree at which the warm water flow rate that matches the indoor temperature with the set temperature is obtained immediately before shifting to the monitoring mode. Since the dehumidifying operation is restarted with the heating capacity substantially equal to the heating capacity, fluctuations in the room temperature Tr are suppressed, and stable room temperature control and efficient dehumidifying operation can be performed.

[0008]

Embodiments of the present invention will be described with reference to the drawings.
In FIG. 4, a heat exchanger for cooling, that is, an evaporator 2 and a heat exchanger 3 for heating are arranged in an indoor unit 1 in order from an upstream side in an air flow path, and an indoor fan 4 is installed at a downstream position thereof. The drain pan 5 is installed below the evaporator 2 and the heat exchanger 3 for heating. The evaporator 2, the compressor 7 arranged in the outdoor unit 6, the condenser 8 that is air-cooled by the outdoor fan 11, and the capillary tube (expansion device) 9 are connected in the refrigerant circuit 10 in the refrigerant circuit to form a refrigeration cycle. The refrigerant compressed by the compressor 7 is liquefied by the condenser 8 and adiabatically expanded by the capillary tube 9, then evaporated by the evaporator 2 and exchanges heat with the air around the evaporator 2. The heating heat exchanger 3 is a water heating heat exchanger installed in the hot water heat source unit 12.
A circulation pump 14 and a warm water valve (flow rate control valve) 15 are connected to 13 by a warm water pipe 16 to form a warm water circulation circuit. The flow rate control valve 15 is driven by a stepping motor and the opening degree is determined by the number of steps, and is connected to the inlet side of the heating heat exchanger 3.

The control device 17 has an indoor temperature Tr and an indoor humidity Hr detected by a detection device 18 having an indoor temperature detection means such as an indoor temperature sensor and a humidity detection means, and a set temperature set by a setting device 19. Ts and set humidity s are input,
Indoor fan 4, compressor 7 of the cooling circuit and outdoor fan 11,
And a control signal is output to the hot water heat source device 12 of the hot water circulation circuit, the circulation pump 14 and the hot water valve 15. During the cooling operation, the indoor fan 4, the compressor 7 and the outdoor fan 11 are operated, and the hot water heat source device 12 is operated. The circulation pump 14 and the hot water valve 15 are turned off. During the heating operation, the indoor fan 4, the hot water heat source device 12 and the circulation pump 14 of the hot water circulation circuit are operated, and the opening degree of the hot water valve 15 is based on the temperature difference between the set temperature Ts and the indoor temperature Tr and the indoor temperature change rate. Is adjusted by fuzzy control to turn off the compressor 7 and the outdoor fan 11 in the cooling circuit. During the dehumidifying operation, the indoor fan 4, the compressor 7 in the cooling circuit, the outdoor fan 11, the hot water heat source device 12 in the hot water circulation circuit, and the circulation pump
14, the hot water valve 15 is turned on.

Next, the control operation will be described. The difference ΔT = Ts − between the set temperature Ts and the detected room temperature Tr.
Tr is calculated. When the temperature difference ΔT is equal to or larger than the first set value α (α> 0, for example α = 2 degrees), heating operation is performed, and the temperature difference ΔT is set to the second set value β (β <0, for example β = (-3 degrees) or less, the cooling operation is performed, and the temperature difference ΔT is the first set value α.
And the second set value β (α>ΔT> β, that is, 3>
ΔT> -2), the detected indoor humidity Hr is the set humidity Hs
When it exceeds a value obtained by subtracting a predetermined value γ (for example, γ = 5%) (Hr> Hs −γ, that is, Hr> Hs −5), the dehumidifying operation is started. During dehumidifying operation, the indoor humidity Hr is H
When s-γ or less, the mode is shifted to the monitoring mode, the compressor 7 of the refrigeration cycle is turned off, and the hot water valve 15 of the hot water circulation circuit is fully closed. The above-mentioned operation categories are shown in FIG.

An example of the control operation based on the above operation classification will be described with reference to the flowchart of FIG. 3. When the operation of the air conditioner is started, the temperature difference ΔT is the first set value α.
It is determined whether or not (α>ΔT> β) between (α = 2 degrees) and the second set value β (β = −3 degrees), that is, the room temperature T.
r is Ts-β>Tr> Ts-α with respect to the set temperature Ts
It is determined whether or not (Ts + 3>Tr> Ts-2) is satisfied, and when the indoor temperature Tr is within this range, the indoor humidity Hr is lower than the set humidity Hs by a predetermined value γ or more. (Hr ≤ Hs -γ, that is, Hr ≤ Hs -5) is determined, and if it is low, the mode shifts to the monitoring mode, the compressor 7 is turned off to stop the operation of the refrigeration cycle, and the hot water valve 15 is turned on. When fully closed, the circulation of hot water in the hot water circulation circuit is stopped. In addition,
(Ts-α) is the heating set temperature, and (Ts-β) is the cooling set temperature. The indoor humidity Hr is Hr against the set humidity Hs
When> Hs-γ (Hr> Hs-5), the dehumidifying operation is performed, the compressor 7 is turned on to perform the refrigeration cycle operation, and the opening degree of the hot water valve 15 is fuzzy controlled to thereby control the hot water. The amount of heating is controlled by adjusting the flow rate of hot water in the circulation circuit.

The room temperature Tr is Ts with respect to the set temperature Ts.
-Β>Tr> Ts-α (Ts + 3>Tr> Ts-2)
If the temperature difference ΔT does not exist within the range in which is satisfied, the temperature difference ΔT is not more than the second set value β (β = −3 degrees) (ΔT ≦ β, that is, ΔT ≦
-3) is determined, that is, the room temperature Tr is not less than the difference between the set temperature Ts and the second set value β (β = −3 degrees) (Tr ≧ Ts −β, that is, Tr ≧ Ts +3). Or not. The temperature difference ΔT is the second set value β (β = −3 degrees)
The following is true: Tr ≧ Ts −β (Tr ≧ Ts +3)
When is satisfied, the operation shifts to the cooling operation, the compressor 7 is turned on to perform the refrigeration cycle operation, and the hot water valve 15 is fully closed to stop the flow of hot water in the hot water circulation circuit. The temperature difference ΔT is not less than or equal to the second set value β (β = −3 degrees), that is, Tr ≧
If Ts-β (Tr ≧ Ts +3) is not satisfied, the temperature difference ΔT becomes equal to or larger than the first set value α (α = 2 degrees), the heating operation is started, the compressor 7 is turned off, and the refrigerating cycle is started. By stopping the operation and fuzzy controlling the opening of the hot water valve 15, the flow rate of hot water in the hot water circulation circuit is adjusted to control the heating amount. By adopting the inverter control in the refrigeration cycle, it becomes possible to perform the control with higher accuracy, and it becomes possible to perform the air conditioning control without clearly setting the operation section.

Here, the control when the dehumidifying operation shifts to the monitoring mode and further when the monitoring mode shifts to the dehumidifying operation will be described. As described above, the room temperature Tr is Ts-β> Tr with respect to the set temperature Ts. > Ts-α (Ts +
When it is within the range of 3>Tr> Ts-2), the dehumidifying operation and the monitoring mode are switched to each other according to the fluctuation of the indoor humidity Hr. In the time chart of FIG. 1, after the operation switch is turned on, the indoor humidity Hr is initially Hs-
When γ is exceeded, dehumidification operation is started at time t ₁ and the hot water valve
The opening degree of 15 is maintained at the preset initial opening degree, the hot water flow rate Q becomes the initial flow rate Q ₁ , and the heating amount (heating capacity) is smaller than the cooling capacity of the refrigeration cycle operating at this point. If so, the room temperature Tr is lower than the set temperature Ts and tends to further decrease as shown in the figure.
The opening degree of 15 is increased by fuzzy control, the hot water flow rate Q is increased to the flow rate Q _2, and the room temperature Tr is raised. When the room temperature Tr reaches or exceeds the set temperature Ts, the hot water valve 15 is fuzzy controlled to reduce its opening, the room temperature Tr reaches the set temperature Ts in the state of the stable flow rate Q ₃ , and the room humidity is reached at time t _2. When Hr becomes Hs-γ or less, the monitor mode is entered. When the time t ₃ indoor humidity Hr is greater than Hs-gamma, when moving to the dehumidifying operation mode from the monitoring mode, stable flow rate Q ₃ of immediately before entering the opening of the hot water valve 15 to the monitoring mode
Is adjusted so that the stable flow rate Q ₃ is the initial flow rate, and the dehumidifying operation is restarted (Q ₁ <Q ₃ <Q ₂ ).

Although not shown in the figure, conversely, the heating capacity by the initial flow rate Q ₁ with the hot water valve 15 as the initial opening exceeds the cooling capacity of the refrigeration cycle, and the room temperature Tr becomes the set temperature Ts.
If it tends to be higher and higher, the hot water valve
If the indoor temperature Tr becomes lower than the set temperature Ts by reducing the opening of 15 to reduce the hot water flow rate Q to the flow rate Q ₄ , the hot water valve
15 is opened to increase the warm water flow rate Q, the room temperature Tr is set to the set temperature Ts at the stable flow rate Q ₅ , and the room humidity Hr is set to Hs.
When it becomes less than -γ, it shifts to the monitoring mode and the indoor humidity Hr
When Hs-γ exceeds Hs-γ, when the monitoring mode is changed to the dehumidifying operation mode, the opening degree of the hot water valve 15 is adjusted to an opening degree to obtain the stable flow rate Q ₅ immediately before the change to the monitoring mode, and the stable flow rate Q
Restart the dehumidification operation with ₅ as the initial flow rate (Q ₁ > Q ₄ >
Q _5). In the above embodiment, α, β, γ are
Although the respective values have been described as constant values, for example, γ = 5% for the determination of the transition from the monitoring mode to the dehumidification operation, and γ = 0 for the determination of the transition from the dehumidification operation to the monitoring mode.
It is desirable to provide hysteresis.

With this configuration, when shifting from the monitoring mode to the dehumidifying operation, the cooling capacity does not exceed or fall below the heating capacity, fluctuations in the room temperature Tr are suppressed, and stable room temperature control and efficient dehumidification are performed. You can drive.

[0016]

Since the present invention is constructed as described above, it has the following effects. By setting the hot water valve opening when shifting from the monitoring mode to the dehumidifying operation to the hot water valve opening that obtains the warm water flow rate that matches the room temperature with the set temperature immediately before shifting to the monitoring mode, the cooling capacity and the heating capacity can be increased. Since the dehumidifying operation is restarted in a state where and are substantially equal to each other, fluctuations in the room temperature are suppressed, and stable room temperature control and efficient dehumidifying operation can be performed.

[Brief description of drawings]

FIG. 1 is a time chart of dehumidifying operation control according to the present invention.

FIG. 2 is an operation classification of a control operation according to the present invention.

FIG. 3 is a flowchart showing an example of a control operation according to the present invention.

FIG. 4 is a schematic configuration diagram showing an example of an air conditioner to which the present invention is applied.

FIG. 5 is a time chart of conventional dehumidifying operation control.

[Explanation of symbols]

1 indoor unit, 2 heat exchanger for cooling (evaporator), 3
Heat exchanger for heating 4 Indoor fan, 5 drain pan, 6 outdoor unit,
7 Compressor 8 Condenser, 9 Capillary tube (expansion device), 10
Refrigerant piping 11 Outdoor fan, 12 Hot water heat source device, 13 Water heating heat exchanger, 14 Circulation pump 15 Flow control valve (hot water valve), 16 Hot water piping, 17 Control device, 18 Detection device 19 Setting device

Front Page Continuation (72) Inventor Yukari Hamashika, 32, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Within Noritsu Co., Ltd. (72) Inventor, Hironobu Fujii 32, Akashi-cho, Chuo-ku, Kobe, Hyogo (56) References JP-A-2-50039 (JP, A) Actual development Sho 56-65331 (JP, U) Actual publication Sho 53-8471 (JP, Y2)

Claims (1)

(57) [Claims] 1. A refrigeration cycle having a compressor, a condenser, an expansion device and an evaporator, a heat source device, a circulation pump, a hot water valve for controlling the flow rate of hot water, a hot water circulation circuit having a radiator, and an indoor temperature detecting means. In the air conditioner provided with the indoor humidity detecting means, the cooling operation in which the refrigeration cycle is operated when the indoor temperature is equal to or higher than the cooling set temperature, and the heating operation in which the hot water circulation circuit is operated when the indoor temperature is equal to or lower than the heating set temperature. Done,
When the indoor temperature is between the cooling set temperature and the heating set temperature, when the indoor humidity exceeds the set value, the dehumidification operation is performed in which the refrigeration cycle and the hot water circulation circuit are operated at the same time, and the indoor humidity is set to the set value. When it is the following, it is a control method of shifting to the monitoring mode that stops the refrigeration cycle and the hot water circulation circuit, and when shifting from the monitoring mode to the dehumidifying operation, the hot water valve at the end of the dehumidifying operation before shifting to the monitoring mode. A dehumidifying operation method for an air conditioner, which starts dehumidifying operation at an opening.