JPH07127894A - Operation controlling method for air conditioner - Google Patents

Abstract

PURPOSE:To conduct a comfortable dehumidifying operation by improving startup characteristics when the operation is started from a stopping state. CONSTITUTION:When a temperature difference DELTAT between a set temperature Ts and an indoor temperature Tr is located between a heating set value a and a cooling set value beta (alpha>DELTAT>beta), a dehumidifying operation is started, a compressor 1 and a cooling circulation pump 12 are turned ON, and a refrigerant circulating circuit and a chilled water circulating circuit are started. After the water circulating circuit is started, a heat source apparatus 13 and a heating circulating pump 19 are started to start a hot water circulating circuit, thereby supplying chilled water to a cooling indoor heat exchanger 9 and supplying hot water to a heating side indoor heat exchanger 16, and supplying an air flow of a suitable temperature which does not alter an indoor temperature Tr.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold water circulation circuit having a cold water generator having a refrigerant circulation circuit, a circulation pump and an indoor heat exchanger, and a hot water circulation having a heat source device, a circulation pump and an indoor heat exchanger. The present invention relates to an operation control method for an air conditioner that includes a circuit and can perform dehumidifying operation in addition to cooling operation and heating operation.

[0002]

2. Description of the Related Art Recently, many air conditioners are capable of performing a dehumidifying operation in which a cooling operation and a heating operation are simultaneously performed in addition to a cooling operation and a heating operation. Room temperature T detected by the temperature detector
The temperature difference ΔT = Ts−Tr is calculated by comparing r with the set temperature Ts, and if the temperature difference ΔT is equal to or higher than the heating set value α (for example, + 3 ° C.) (ΔT ≧ α), the heating operation, the temperature difference ΔT is Dehumidification operation is performed between the heating setting value α and the cooling setting value β (for example, −2 ° C.) (α>ΔT> β), and when the temperature difference ΔT is less than or equal to the cooling setting value β (ΔT ≦ β) During the cooling operation, when starting the dehumidification operation from the air conditioner stopped state, both the compressor of the refrigerant circulation circuit and the heat source device of the hot water circulation circuit are turned on, and the temperature difference ΔT becomes equal to the heating set value α and cooling. The dehumidifying operation is started when it is within the set value β (α>ΔT> β). The indoor temperature detector is installed at the outlet of the indoor heat exchanger, and detects the hot air or cold air blowing temperature to obtain the indoor temperature Tr.

[0003]

However, a refrigerant circulation circuit provided with a compressor, an expansion device, a condenser, and an evaporator, and a cold water generator, a circulation pump, and an indoor heat exchanger to which the evaporator of the refrigerant circulation circuit is connected. In a cold water circulation circuit having a heater, a heat source unit, a circulation pump, and a hot water circulation circuit having a hot water circulation circuit having an indoor heat exchanger, in a so-called cold / hot water air conditioner, when the dehumidifying operation is started from the stopped state of the air conditioner, The rise time of the cold water circulation circuit is added to the rise time of the cold water circulation circuit to the rise time of the hot water circulation circuit, so the time when cold water is supplied to the indoor heat exchanger and the blowing of cold air is delayed. In the beginning, warm air is blown out from the indoor heat exchanger of the warm water circulation circuit having a short rise time (for example, 1 to 2 minutes), and the indoor temperature Tr
There was a fear of rising. During the dehumidifying operation (rainy season, autumn rainy season, etc.), the rise in room temperature due to the warm air at the start of the dehumidifying operation gives an uncomfortable feeling and is inconvenient. Further, in the above operation control method, when the dehumidifying operation is started from the stopped state of the air conditioner, warm air is blown out first to raise the room temperature Tr and the temperature difference ΔT becomes equal to or less than the cooling set value β. Shift to cooling operation, and the hot water circulation circuit is stopped. However, when cold water begins to circulate in the cold water circulation circuit, cold air begins to blow out from the indoor heat exchanger and the indoor temperature Tr decreases, and the temperature difference ΔT is between the heating set value α and the cooling set value β (α>ΔT> β). However, since the hot water circulation circuit is temporarily stopped, the supply of hot water is delayed and the indoor temperature Tr continues to decrease, and the temperature difference ΔT becomes equal to or higher than the heating set value α, and the heating operation is performed. And the chilled water circulation circuit is stopped (the refrigerant circulation circuit is also stopped). When the warm water reaches the radiator and the heating operation is started after the lapse of the rising time, the indoor temperature Tr rises and the temperature difference ΔT is between the heating setting value α and the cooling setting value β (α>ΔT> β). However, if the compressor is restarted immediately after the operation is stopped, an excessive load will be applied and it will cause a failure. Therefore, the compressor will be forcibly stopped for a predetermined time (for example, 3 minutes). Therefore, the compressor cannot be immediately started. During that time, the warm water circulation circuit is operating, so the room temperature T rises, and the temperature difference ΔT eventually becomes less than the cooling set value β. The hot water circulation circuit is also stopped and the monitoring state is entered. As described above, dehumidifying operation → cooling operation → dehumidifying operation →
Since the operation mode change from heating operation to dehumidification operation to monitoring status is performed regardless of the actual room temperature (which is different from the room temperature Tr detected by the room temperature detector), the indoor humidity and room temperature are controlled. There was a problem that the power consumption becomes excessive with the delay.

An object of the present invention is to improve a rising characteristic when starting a dehumidifying operation from a stopped state in an air conditioner having a refrigerant circulating circuit and a hot water circulating circuit, and to perform a comfortable dehumidifying operation. An operation control method of an air conditioner is provided.

[0005]

In order to achieve the above object, an operation control method of an air conditioner according to the present invention is a refrigerant circulation circuit having a compressor, an expansion device, a condenser and an evaporator, and a refrigerant circulation circuit. A cold water generator having an evaporator connected thereto, a circulation pump having a circulation pump and an indoor heat exchanger, and a hot water circulation circuit having a heat source device, a circulation pump and an indoor heat exchanger. In an air conditioner capable of performing dehumidification operation, the refrigerant circulation circuit and the cold water circulation circuit are started first at the start of the dehumidification operation, and the hot water circulation circuit is started later than the refrigerant circulation circuit and the cold water circulation circuit. . A delay timer may be provided in the hot water circulation circuit, the delay timer may be activated when the dehumidifying operation is started, and the hot water circulation circuit may be activated after a predetermined time elapses after activation of the refrigerant circulation circuit and the cold water circulation circuit. It should be noted that the condenser of the refrigerant circulation circuit is an evaporative condenser, and a detecting means for detecting the water level in the drain pan of the evaporative condenser is provided, and when the dehumidifying operation is started, the water level of the evaporative condenser is equal to or more than a predetermined value. The hot water circulation circuit may be activated at the same time when the water supply operation is completed and the compressor is activated. Further, the outgoing cold water temperature detecting means may be provided in the outgoing pipe of the cold water circulation circuit, and at the start of the dehumidifying operation, the hot water circulation circuit may be activated after confirming that the outgoing cold water temperature has become equal to or lower than a predetermined value. It is a thing. Furthermore, a cooling heat exchanger temperature detection means is provided in the indoor heat exchanger of the cold water circulation circuit, and when the dehumidifying operation starts,
The indoor fan may be started after confirming that the temperature of the cooling heat exchanger has become equal to or lower than a predetermined value.

[0006]

In the air conditioner including the refrigerant circulation circuit, the cold water circulation circuit, and the hot water circulation circuit and capable of performing the cooling operation, the heating operation, and the dehumidification operation, the refrigerant circulation circuit and the cold water circulation circuit are provided at the start of the dehumidification operation. To start the hot water circulation circuit later than the refrigerant circulation circuit and the cold water circulation circuit to start cold air from the indoor heat exchanger of the cold water circulation circuit and warm air from the indoor heat exchanger of the hot water circulation circuit. Are blown out almost at the same time, and the warm air does not blow out from the indoor heat exchanger in the hot water circulation circuit to raise the indoor temperature Tr before the cold air blows out from the indoor heat exchanger in the cold water circulation circuit. As a means for starting the hot water circulation circuit later than the refrigerant circulation circuit and the cold water circulation circuit, a delay timer is provided in the hot water circulation circuit and the delay timer is started at the start of dehumidification operation, or the refrigerant circulation circuit is condensed. The evaporator is an evaporative condenser, and the water level in the drain pan of the evaporative condenser reaches or exceeds a predetermined value to end the water supply operation, and at the same time when the compressor is activated, the hot water circulation circuit is activated, or cold water circulation is performed. Start the hot water circulation circuit after confirming that the outgoing cold water temperature of the circuit is below a predetermined value.
Further, there is means for activating the indoor fan after confirming that the temperature of the cooling heat exchanger of the cold water circulation circuit has become equal to or lower than a predetermined value.

[0007]

EXAMPLE An air conditioner to which the present invention is applied will be described. In FIG. 2, the refrigerant circulation circuit includes a compressor 1, an evaporative condenser 2, a capillary tube (expansion device) 3,
The evaporator 4 and the evaporator 4 are sequentially connected by a refrigerant pipe. The evaporative condenser 2 is provided with a cooling fan 21 and a pumping funnel 22 which are driven by a drive motor 20, and a condensation heat exchange tube which is arranged around the pumping funnel 22 and which is connected to the compressor 1 and the capillary tube 3, respectively. 23, a drain pan 24 arranged at the bottom, a drain pipe 25 connected to the drain pan 24 and having a drain solenoid valve 26, a drain water level detection electrode 27 for detecting the water level in the drain pan 24, and a water supply pipe 28. A cooling-side makeup water pipe 280 having a cooling-side makeup water solenoid valve 281 and an overflow pipe 29 connected to the upper portion of the drain pan 24 are provided.

The cold water circulation circuit is the evaporator 4 of the refrigerant circulation circuit.
A cooling water generator 5 having a built-in unit and a cooling indoor heat exchanger 9 include a cooling outflow pipe 6 having a check valve 7 and a first flow rate control valve 8, an air separator 11 and a cooling circulation pump 12. The cooling water return pipe 10 is provided, and a cooling water temperature detection thermistor 32 is provided in the cooling outflow pipe 6 near the outlet of the cooling water generator 5, and a cooling indoor heat exchanger 9 is provided with a cooling heat exchanger temperature detection thermistor. 30 is provided. In the heating circulation circuit, the heating outflow pipe 14 connected to the hot water supply side of the water heater (heat source device) 13 is the second.
The heating return pipe 17 connected to the inlet side of the heating indoor heat exchanger 16 via the flow rate control valve 15 and connected to the outlet side of the heating indoor heat exchanger 16 is connected to the expansion tank 18, and the heating circulation pump 19
The expansion tank 18 and the water inlet side of the water heater 13 are connected by a water inlet pipe 171 provided with a heating indoor heat exchanger 16 provided with a heating heat exchanger temperature detection thermistor 31,
A high limit switch 33 and a heating thermistor 34 are provided at 14, and a water level detection electrode 20 is provided at the expansion tank 18. A heating indoor heat exchanger 16 is arranged downstream of the cooling indoor heat exchanger 9 in the indoor blowing fan (not shown) blowing direction (see arrow). Expansion tank
18 is a solenoid valve for heating side makeup water that is branched from the water supply pipe 28.
A heating side makeup water pipe 181 equipped with 182 is connected. In addition, the cooling and heating switching pipe 6 and the heating and cooling switching pipe 14 are connected to each other by the cooling and heating switching valve 36.
The air separator 11 and the heating return pipe 17 are communicated with each other by the cooling / heating switching bypass pipe 37. The water heater 13 includes a heat exchanger 131, a gas burner 132, a combustion fan 136, a spark plug and a frame rod 137, and a gas proportional pipe 133 and a gas solenoid valve are provided in a gas supply pipe connected to the gas burner 132. 134 and a gas source solenoid valve 135.

The operation will be described. During the cooling operation, the cooling / heating switching valve 36 is closed to drive the compressor 1 to transfer the refrigerant to the compressor 1, the evaporative condenser 2, the capillary tube 3,
It is circulated to the evaporator 4, and the water in the cold water generator 5 is cooled by the evaporator 4. The cooling circulation pump 12 is driven, and the cold water in the cold water generator 5 is supplied to the cooling indoor heat exchanger 9 through the cooling outflow pipe 6 via the check valve 7 and the first flow control valve 8 to generate cold air. , Cooling room heat exchanger 9 to air separator 11
It is recirculated to the cooling circulation pump 12 via. At this time, the cooling capacity is controlled by adjusting the opening degree of the first flow control valve 8. On the other hand, during heating operation, the heating circulation pump 19 and the water heater 13 are operated, and hot water flows from the heating outflow pipe 14 to the second flow control valve.
After being supplied to the heating indoor heat exchanger 16 via 15 to generate warm air, it is returned to the expansion tank 18. At this time, the heating capacity is controlled by adjusting the opening degree of the second flow rate control valve 15. To increase the heating capacity, the compressor 1 and the cooling circulation pump 12 are stopped and the cooling / heating switching valve 36 is opened, so that the cooling indoor heat exchanger 9 and the heating indoor heat exchanger 16 are provided.
At the same time, supply hot water. Further, during the dehumidifying operation, the compressor 1 and the cooling circulation pump 12 are started to operate the refrigerant circulation circuit and the cooling water circulation circuit to supply the cooling water to the cooling indoor heat exchanger 9 located on the upstream side, and at the same time, the heating circulation pump. 19 and the water heater 13 are activated to operate the hot water circulation circuit to supply hot water to the heating-side indoor heat exchanger 16 and to blow a proper temperature air that does not change the indoor temperature Tr.

Next, the control operation will be described with reference to the flow chart of FIG. 1. The difference ΔT = Ts−Tr between the set temperature Ts and the detected room temperature Tr is calculated to obtain the temperature difference Δ.
When T is equal to or higher than the heating set value α (α> 0, for example, α = 3 ° C), the heating operation is performed, and the temperature difference ΔT is the cooling set value β (β <
0, for example, β = −2 ° C.) or less, the cooling operation is performed, and the temperature difference ΔT is between the heating setting value α and the cooling setting value β (α>ΔT> β, that is, 3 ° C.). >ΔT> -2 ° C)
At the time, it shifts to dehumidification operation.

When the operation of the air conditioner is started, the temperature difference Δ
It is determined whether T is equal to or higher than the heating set value α (ΔT ≧ α), and if the temperature difference ΔT is equal to or higher than the heating set value α (ΔT ≧ α), the heating operation is performed, and the compressor 1 and The cooling circulation pump 12 is turned off to stop the operation of the refrigerant circulation circuit and the cold water circulation circuit, and the opening degree of the second flow control valve 15 is controlled to adjust the hot water flow rate of the hot water circulation circuit to control the heating amount. To do. When the temperature difference ΔT is less than the heating set value α (ΔT <α), it is determined whether the temperature difference ΔT is less than or equal to the cooling set value β (ΔT ≦ β), and the temperature difference ΔT is set to the cooling set value β. Below (Δ
If T ≦ β), the operation shifts to the cooling operation, the compressor 1 and the cooling circulation pump 12 are turned on to operate the refrigerant circulation circuit and the cold water circulation circuit, and the opening degree of the first flow control valve 8 is adjusted. Adjust the cooling water flow rate of the cooling water circulation circuit to control the cooling capacity,
The second flow control valve 15 is fully closed to stop the flow of hot water in the hot water circulation circuit. Next, when the temperature difference ΔT is less than the heating setting value α (ΔT <α) and the temperature difference ΔT exceeds the cooling setting value β (ΔT> β), the temperature difference ΔT is the heating setting value α.
Between the air conditioner and the cooling set value β (α>ΔT> β), the dehumidifying operation is started as described later.

When the room temperature Tr is between the heating set value α and the cooling set value β (α>ΔT> β), the dehumidifying operation is started and the compressor 1 and the cooling circulation pump 12 are turned on to circulate the refrigerant. After the operation of the circuit and the cold water circulation circuit is started, and the cold water circulation circuit is activated, the heat source device 13 and the heating circulation pump 19 are started to activate the hot water circulation circuit, thereby cooling the indoor heat exchanger 9 in the cooling water. Is supplied to the heating-side indoor heat exchanger 16, and a suitable temperature air that does not change the indoor temperature Tr is blown. The following means can be considered as means for activating the hot water circulation circuit after the cold water circulation circuit has been activated. A delay timer is provided in the controller of the hot water circulation circuit, and when the dehumidification operation start signal is input from the stopped state of the air conditioner,
After the cold water circulation circuit is activated, the hot water circulation circuit is activated after the set time has elapsed by the delay timer. With this configuration, the hot water circulation circuit can be activated after the cold water circulation circuit is activated with a simple configuration, and there is no fear that hot air will blow out into the room. . After the drain water level detection electrode 27 detects that the water level in the drain pan 24 of the evaporative condenser 2 reaches or exceeds a predetermined value and the water supply operation is completed, the compressor of the refrigerant circulation circuit is activated and hot water is simultaneously supplied. Activate the circulation circuit. According to this configuration, after confirming that the refrigerant circulation circuit is ready for activation, the hot water circulation circuit is activated at the same time as the refrigerant circulation circuit.
The cold water and the hot water are supplied to the heating indoor heat exchanger 16 of the hot water circulation circuit at substantially the same time, and there is no fear that hot air will blow out into the room. After confirming that the outgoing cold water temperature has become equal to or lower than a predetermined value determined by the outgoing cold water temperature detection thermistor 32 provided in the cooling outgoing pipe 6 of the cold water circulating circuit, that is, after confirming that the cold water circulating circuit has been activated. , Start the hot water circulation circuit. With this configuration, the hot water circulation circuit is started after confirming that cold water is supplied to the cooling room heat exchanger 9 of the cold water circulation circuit. Therefore, the heating indoor heat exchanger of the hot water circulation circuit is activated.
There is no fear that hot air will blow out into the room because the hot water supply to 16 is too early. After confirming that the temperature of the cooling heat exchanger has become equal to or lower than a predetermined value by the cooling heat exchanger temperature detection thermistor 30 provided in the cooling room heat exchanger 9 of the cooling water circulation circuit,
An indoor fan (not shown) that blows air to the indoor heat exchangers 9 and 16
To start. According to this configuration, the cooling room heat exchanger 9
Since the indoor fan is started after confirming that the temperature of the cooling heat exchanger is below a predetermined value, only hot air is not supplied to the room, and there is no fear that hot air will blow out into the room. .

Although the above means are described as being adopted individually, two or more kinds of means are used in combination, and after the chilled water circulation circuit is activated, any one of the means adopted is The hot water circulation circuit may be activated when it is filled. Alternatively, two or more types may be used in combination, and after the cold water circulation circuit is activated, the hot water circulation circuit may be activated when all the conditions of the adopted means are satisfied.

Next, if the room temperature Tr is within the range of Ts-β>Tr> Ts-α (β <ΔT <α) with respect to the set temperature Ts, the dehumidifying operation is continued. When the room temperature Tr rises and the temperature difference ΔT from the set temperature Ts becomes equal to or less than the cooling set value β (ΔT = Ts-Tr ≦ β <0), the cooling operation is started and the water heater 13 is turned off. . Further, when the room temperature Tr decreases and the temperature difference ΔT from the set temperature Ts becomes the heating set value α or more (ΔT = Ts −Tr ≧ α> 0), the compressor 1 and the cooling circulation pump 12 are turned off to cool the cold water. The circulation circuit is stopped to shift to heating operation, and the second flow control valve 15 is controlled.

[0015]

Since the present invention is constructed as described above, it has the following effects. An air conditioner that includes a refrigerant circulation circuit, a cold water circulation circuit, and a hot water circulation circuit, and can perform cooling operation, heating operation, and dehumidifying operation,
When the dehumidifying operation is started, the refrigerant circulation circuit and the cold water circulation circuit are started first, and the hot water circulation circuit is started later than the refrigerant circulation circuit and the cold water circulation circuit, so that cold air from the indoor heat exchanger of the cold water circulation circuit The hot air from the indoor heat exchanger of the hot water circulation circuit will blow out almost at the same time, and before the cold air blows out from the indoor heat exchanger of the cold water circulation circuit, the hot air will blow out from the indoor heat exchanger of the hot water circulation circuit. Temperature Tr
Never rises. As a means for starting the hot water circulation circuit later than the refrigerant circulation circuit and the cold water circulation circuit, a delay timer is provided in the hot water circulation circuit, and the delay timer is started at the start of dehumidification operation, whereby the cold water circulation is performed with a simple configuration. The hot water circulation circuit can be activated after the circuit is activated, and there is no fear that hot air will blow out into the room. Also, the condenser of the refrigerant circulation circuit is an evaporative condenser, and the water level in the drain pan of the evaporative condenser reaches or exceeds a predetermined value and the water supply operation ends, and at the same time the compressor starts, the hot water circulation circuit is activated. By confirming that the refrigerant circulation circuit is ready for activation by activating it, by activating the hot water circulation circuit at the same time as the refrigerant circulation circuit, the cold water in the cooling room heat exchanger of the cold water circulation circuit is Since hot water is supplied to the heating indoor heat exchanger at about the same time, there is no fear that hot air will blow out into the room. Also, by confirming that the outgoing cold water temperature of the cold water circulation circuit is below a predetermined value, and activating the hot water circulation circuit, the cold water is supplied to the cooling room heat exchanger of the cold water circulation circuit. Since the hot water circulation circuit is started after confirmation, there is no fear that hot air will be blown into the room because the hot water supply to the heating indoor heat exchanger in the hot water circulation circuit is too early. Furthermore, by confirming that the temperature of the cooling heat exchanger of the chilled water circulation circuit has become equal to or lower than the predetermined value, the indoor fan is started to set the temperature of the cooling heat exchanger of the cooling indoor heat exchanger 9 to the predetermined value. Since the indoor fan is started after confirming that it is below the specified value,
Only hot air is not supplied to the room, and there is no fear that hot air will blow out into the room.

[Brief description of drawings]

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

FIG. 2 is a schematic configuration diagram showing an example of an air conditioner to which the present invention is applied.

[Explanation of symbols]

1 Compressor, 2 Evaporative condenser, 3 Capillary tube (expansion device) 4 Evaporator, 5 Cold water generator, 6 Cooling forward pipe, 7 Check valve 8 1st flow control valve, 9 Cooling room heat exchanger, 10 Cooling return pipe 11 Air separator, 12 Cooling circulation pump, 13 Water heater (heat source device) 14 Heating outflow pipe, 15 Second flow control valve, 16 Heating indoor heat exchanger 17 Heating return pipe, 18 Expansion tank, 19 Heating circulation pump , 24 Drain pan 27 Drain water level detection electrode, 30 Cooling heat exchanger temperature detection thermistor 31 Heating heat exchanger temperature detection thermistor, 32 Forward cooling water temperature detection thermistor

Claims (5)

[Claims] 1. A cold water circulation circuit having a refrigerant circulation circuit including a compressor, an expansion device, a condenser, and an evaporator, and a cold water generator, a circulation pump, and an indoor heat exchanger to which the evaporator of the refrigerant circulation circuit is connected. And a hot water circulation circuit having a heat source device, a circulation pump and an indoor heat exchanger, and an air conditioner capable of performing cooling operation, heating operation and dehumidifying operation, in a dehumidifying operation, a refrigerant circulating circuit and a cold water circulating circuit. Is started first, and the hot water circulation circuit is started later than the refrigerant circulation circuit and the cold water circulation circuit, and the operation control method of the air conditioner. 2. A delay timer is provided in the hot water circulation circuit, the delay timer is activated at the start of dehumidification operation, and the hot water circulation circuit is activated after a predetermined time has elapsed after activation of the refrigerant circulation circuit and the cold water circulation circuit. Claim 1 characterized by the above-mentioned.
A method for controlling operation of the air conditioner described. 3. A condenser of the refrigerant circulation circuit is an evaporative condenser, detection means for detecting the water level in the drain pan of the evaporative condenser is provided, and the water level of the evaporative condenser is predetermined at the start of dehumidification operation. The operation control method for an air conditioner according to claim 1, wherein the hot water circulation circuit is activated at the same time when the water supply operation is completed when the water temperature reaches a predetermined value or more and the compressor of the refrigerant circulation circuit is activated. 4. A cold water temperature detecting means is provided in the forward pipe of the cold water circulation circuit, and when the dehumidifying operation is started, the hot water circulation circuit is started after confirming that the temperature of the cold water is below a predetermined value. The operation control method for an air conditioner according to claim 1, wherein: 5. The indoor heat exchanger of the chilled water circulation circuit is provided with a cooling heat exchanger temperature detecting means, and when the dehumidifying operation is started, it is confirmed that the cooling heat exchanger temperature is below a predetermined value. The operation control method for an air conditioner according to claim 1, wherein a fan is started.