JPH0762551B2 - Dehumidifying operation method of air conditioner - Google Patents

Description

The present invention relates to an air conditioner having a refrigeration cycle using a compressor and a brine circulation cycle using a heating device, and particularly to a method for controlling dehumidification operation. It is about.

(B) Conventional technology As a conventional technology for such an air conditioner, there is
There was something like that described in Japanese Patent No. 52262. The one described in this publication is to perform the cooling operation by operating the refrigeration cycle during the cooling operation and to perform the heating operation by circulating the brine heated by the heating device during the heating operation.

(C) Problem to be Solved by the Invention In the conventional air conditioner as described above, if the cooling operation and the heating operation are performed at the same time, cooling is performed using the refrigeration cycle,
Dehumidified air can be reheated using a brine cycle and fed to the conditioned room. That is, the dehumidifying operation was performed.

When performing such dehumidifying operation, it was necessary to operate the compressor and the heating device at the same time.However, due to the off-season of heating or the transition of the season, forgetting to supply power to the heating device, gas, kerosene, etc. If the fuel supply is forgotten, the compressor is driven and only the cooling operation by the refrigeration cycle is performed. For this reason, although the dehumidifying effect is provided, the conditioned room is also cooled at the same time, and operation is performed that does not suit the user's intention.

With respect to such a problem, the present invention provides a dehumidifying operation method capable of performing dehumidification without lowering the temperature of the controlled room even when the heating device does not operate.

(D) Means for Solving the Problems The present invention relates to a refrigeration cycle in which a compressor, a condenser, a decompression device, and an evaporator whose capacity can be changed are sequentially connected in an annular shape by a refrigerant pipe, a heating device, a radiator, and a pump. Is equipped with a brine circulation cycle that is connected in an annular shape by brine piping, and an evaporator is installed in the air passage that blows air to the room to be conditioned, and a radiator is installed on the leeward side of this evaporator to cool it with the evaporator. In an air conditioner that is configured to perform dehumidifying operation by heating the air in the controlled room with a radiator, the temperature of the radiator reaches a specified temperature after a certain time from the start of dehumidifying operation during dehumidifying operation. When it has not reached, the compressor is set to a low capacity, and the air blown to the room to be conditioned is set to intermittent operation or alternating operation of strength and weakness.

Also, in the dehumidifying operation, if the temperature of the radiator after a certain time from the start of the dehumidifying operation is not higher than the temperature of the radiator after the dehumidifying operation starts by a predetermined temperature or more, set the compressor to low capacity and move to the room to be conditioned. Is set to intermittent operation or alternating operation of strength and weakness.

(E) Operation In the air conditioner configured in this way, during dehumidifying operation,
When the temperature of the radiator has not reached the specified value after a certain time has passed from the start of the dehumidifying operation, or the temperature of the radiator is not higher than the temperature of the radiator when starting the dehumidifying operation by more than the specified temperature, the heat source device operates. It is determined that the compressor is not operated, and the compressor is set to have a low capacity, and the blower is set to intermittent operation or alternating operation of strength and weakness to obtain a dehumidifying effect without cooling the conditioned chamber too much.

(F) Embodiments Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a refrigerant circuit diagram showing a refrigeration cycle of an air conditioner including an outdoor unit 1 and an indoor unit 2 and a brine circulation cycle. In this figure, 3 is a compressor having a three-phase induction motor, 4 is a condenser, 5 is a decompression device, 6 is an evaporator, and 7 is an accumulator, each of which is connected annularly by a refrigerant pipe to form a refrigeration cycle. is doing. A radiator 12 is provided on the leeward side of the air passage of the evaporator 6 so that the brine flows close to the evaporator 6. The radiator 12 includes a heating device 8 (burner), a pressure tank 9, a reserve tank 10,
A circulation cycle in which brine circulates is configured together with a pump having a three-phase induction motor. By operating the compressor in the refrigeration cycle, the refrigerant flows in the direction of the solid arrow, and the evaporator 6 performs cooling operation. By igniting the burner 8 and operating the pump 11, the brine heated by the burner 8 flows to the radiator 12 for heating operation.

The evaporator 6 and the radiator 12 are provided at the same time in the air passage of the blower, and the evaporator 6 is provided on the windward side and the radiator 12 is provided on the leeward side. Therefore, when both the compressor 3 and the burner 8 are operated, the air blown by the blower 30 is first cooled by the evaporator 6 and then heated by the radiator 12. That is, the dehumidifying operation is performed. At this time, if the cooling capacity or the heating capacity is adjusted, the warming dehumidifying operation and the cooling dehumidifying operation can be performed. Reference numeral 13 denotes a floor heating mat, which circulates the brine before being heated by the burner 8 by operating the pump 11. That is, the pump 11
Drive the brine and burner 8 and mat 13 (mat
It is not supplied when 13 is not connected) and is supplied. Therefore, the brine, which has been once radiated by the radiator 12, flows into the mat 13, and the radiant temperature of the mat 13 is lower than the radiant temperature of the radiator 12. The pressure tank 9 stores a part of the brine in the reserve tank 10 when the pressure in the circulation cycle of the brine is equal to or higher than a predetermined pressure due to thermal expansion of the brine and discharge pressure of the pump 11. Reference numeral 14 is a float switch for detecting the liquid level of the brine in the reserve tank 10.

The burner 8 is a burner motor 15, a first combustion section 16, a second
A combustion section 17, combustion switching valves 18 and 19, a proportional valve 20 that proportionally controls the fuel supply amount, and a solenoid valve 21 that shuts off the fuel supply,
The amount of combustion is adjusted by adjusting the opening of the proportional control valve 20, and the combustion section is selected (or both sections) to meet the required heating amount.

FIG. 2 is a perspective view of the outdoor unit shown in FIG.
This unit 1 includes a compressor 3, a condenser 4, a pressure reducing device 5,
Burner 8, pressure tank 9, reserve tank 1
It houses 0, a pump 11, a blower for the condenser 4 (FIG. 3), and an outdoor control unit (not shown). 22 is the suction port of the blower.

FIG. 3 and FIG. 4 are a front view and a top view of the outdoor unit shown in FIG. 2 with the cover removed. In these drawings, 23 is a fan, which together with the electric motor 24 constitutes a blower. Reference numerals 25 and 26 are compartments for housing the compressor 3 and the like and compartments for housing the condenser 4 and the like, and are surrounded by partition walls 27 and 28. Incidentally, 29 is a panel covering the front side of the compartment 26, and a portion corresponding to the fan 23 is cut out in a circular shape to form an air passage. In the compartment 25, a vertical burner 8 is arranged side by side with the compressor 3, and the combustion heat in the lower portion flows upward, during which brine (for example, water) is heated.

The pump 11 sucks in the brine as indicated by the solid arrow and then discharges it. The brine piping through which the brine flows is omitted.

FIG. 5 is an electric circuit diagram used for the indoor unit 2 shown in FIG. In the figure, reference numeral 31 is a microprocessor, which controls the burners of the respective devices after performing predetermined calculation and judgment processing based on input data and set values. The main operation of the microprocessor 30 will be described later using a flowchart. Reference numerals 32 and 33 denote temperature sensors (negative characteristic thermistors and the like), which are provided at positions where the temperature of the radiator 12 and the room temperature of the controlled room can be detected. 34,3
5 is a resistor, which is connected to the temperature sensors 32 and 33 in series with the power supply terminal + Vc
It is connected between c and the analog reference input terminal P0 of the microprocessor 31. Therefore, the voltage between the temperature sensor and the resistor changes depending on the temperature detected by the temperature sensors 32 and 33. This voltage is applied to the terminals A1 and A2 of the microprocessor 31. In addition, 36 to 39 are capacitors for absorbing noise, which prevent voltage fluctuation due to noise.

Reference numeral 40 is an inverter circuit, and the three-phase output is supplied to the electric motor of the blower 30. This motor is a three-phase induction motor,
It may be either a three-phase brushless motor or an induction motor with a speed adjustment terminal. When the three-phase induction motor is used, a switching signal for controlling the output frequency by the PWM method is output from the terminal I of the microprocessor 31 to the inverter circuit 40, and the frequency-controlled three-phase power is supplied from the inverter circuit 40 to the blower device 30. Supply to the motor to control the air flow. When a three-phase brushless motor is used, the rotational position of the rotor of the electric motor is detected, and the coil to be energized is switched based on this rotational position, and the rotational speed is controlled by switching the voltage applied to the coil. Further, when the induction motor is provided with a speed adjustment terminal, the rotation speed of the electric motor is changed by switching the terminal for supplying electric power.

Reference numeral 41 denotes a display unit, which is a liquid crystal display plate for displaying the operation mode of the air conditioner, a set value of room temperature, and the start time of timer operation, an LED lamp and a display plate on which display characters are written.

Reference numeral 42 denotes a wireless signal receiving unit, which receives the operation signal from the remote controller 43 and outputs the operation signal to the terminal 42 of the microprocessor 31. As this operation signal, a selection signal of an operation mode (heating, cooling, dehumidifying operation),
A signal such as a room temperature setting signal, an air flow rate setting signal of the blower, a time or time setting signal for timer operation, an air conditioner operation stop signal, or the like is transmitted.

44 is an interface circuit, a microprocessor
It transmits and receives signals between the 31 and the microprocessor of the outdoor unit. The signals sent from the indoor unit to the outdoor unit include the operation / stop signal of the compressor 3, the capacity setting signal of the compressor 3 (capacity switching signal, rotation speed signal, frequency signal of the inverter output), operation / stop of the burner 8. Signals, a burner 8 combustion amount setting signal, a pump 11 operation / stop signal, a pump 11 speed signal, and the like. The signals sent from the outdoor unit to the indoor unit include equipment such as compressors, burners, and pumps, refrigeration cycle, and signals when the brine circulation cycle is abnormal.

FIG. 6 is a flow chart showing the main operation of the microprocessor shown in FIG. First, in step S1, the signals and the like sent from the mote controller 43 are stored as respective data values. Next, in step S2, it is determined whether the operation mode is set to cooling, heating, or dehumidification. When "cooling" is set, the process proceeds to step S4. In step S4, the burner 8 and the pump 11 are stopped, and a signal for operating only the compressor 3 is sent to the outdoor unit to perform cooling operation. When "heating" is set, the process proceeds to step S3. In step S3, the compressor 3 is stopped and a signal for operating the burner 8 and the pump 11 is sent to the outdoor unit to perform heating operation. When "dehumidification" is set, the process proceeds to step S5. In step S5, it is determined whether or not the operation is currently set, and if it is not in the operating state, the process proceeds to step S6 and a stop process is performed to keep the air conditioner in the stopped state. In the operating state, the process proceeds to step S7. In step S7, it is determined whether the operating state has changed from the OFF state to the ON state, and the following steps S8 to S10 are performed. The temperature T ₁ of the step S8~S10 radiator 12 of the start of operation in to and store measurement, after the start of the dehumidifying operation warmed Gimi to start counting the timer. The warming dehumidification operation is a simultaneous operation of the cooling operation of the refrigeration cycle using the compressor 3 and the heating operation of the circulation cycle of the brine using the burner 8. Therefore, after the air cooled and dehumidified by the evaporator 6 is heated by the radiator 12, it is discharged into the conditioned chamber by the air blower. At this time, the combustion amount of the burner 8 is set so that the heating amount of the radiator 12 is appropriately larger than the cooling amount of the evaporator 6. That is, the temperature of the discharged air is set to be slightly higher, and the dehumidifying operation is performed while the room to be conditioned is warmed appropriately. The combustion amount of the burner 8 is adjusted according to the amount of air blown by the air blower 30. Alternatively, the temperature of the discharge air may be detected, and the combustion amount of the burner 8 may be adjusted so that this temperature always becomes a constant value (room temperature +2 to 3 ° C).

In step S11, it is determined whether the operating state has changed from the ON state to the OFF state. In the OFF state, stop processing is performed in step S6.

In step S12, it is determined whether or not the timer that started time counting in step S10 is timer UP (time counting 3 minutes).
This time is set according to the capacity of the air conditioner, the length of the brine circulation system, and the installation conditions. Time U in step S12
After the storing were measured temperature T ₂ of the radiator 12 in step S13 when P is determined, the process proceeds to step S14, the temperature of the temperatures T ₁ and the radiator 12 after time UP operation start of the radiator 12 Make the following judgment from T ₂ . "T ₁ +3 <T _2" when the filled proceeds to step S15, the process proceeds to step S16 when not. In this step, it is determined whether or not the burner 8, the pump 11 and the like are operating normally and the heating amount in the radiator 12 is normally obtained. Therefore, this determination is not limited to this condition, and may be, for example, "T ₂ ≥T ₀ " (T ₀ is a constant of about 35 ° C to 40 ° C), "T ₂ > T ₁ ", and the like. In addition, when the heated brine does not flow to the radiator due to some abnormality, only the evaporator 6 dehumidifies and cools, so the radiator 12 on the leeward side is cooled and the temperature T of the radiator 12 increases. ₂ is lower than the temperature T ₁ at the start of operation.

When the condition of step S14 is satisfied, step S
If not, the process proceeds to step S15 and then to step S15.

In step S16, it is judged that there is some abnormality in the circulation cycle of the brine, for example, the burner 8 is cut off, the fuel cock to the burner 8 is forgotten to open, or the pump 11 is broken. Is to do. During the cold dehumidification operation, the operation of the burner 8 and pump 11 was stopped,
After the compressor 3 is operated at a low capacity, the blower device 30 is operated intermittently or switched between strong and weak. By intermittently operating the air blower 30, while the air is being blown, dehumidification in the room to be conditioned and cooling operation with low capacity are performed,
When the air is not blown, the temperature in the conditioned room rises because cooling is not performed. Therefore, although the temperature of the controlled room is lowered by the amount of cooling, the operating capacity of the compressor is set to a low capacity, so that the temperature drop of the controlled room can be suppressed to a small level. The amount of air blown is strong or weak (the amount of strong air blow is about 2 to 3 times the amount of weak air blow, and the amount of weak air blow is close to 0). The dehumidification operation of Gigi can be performed.

In step S15, the warming or cold dehumidifying operation is continuously performed. After this step again
Return to S1.

In the air conditioner configured as described above, when the dehumidifying operation is performed and the reheating by the radiator cannot be obtained due to some abnormality, the dehumidifying effect is automatically obtained by only the operation of the refrigeration cycle. It was done. Also, if you want to obtain the dehumidifying effect of coldness, you can automatically dehumidify the coldness by intentionally shutting off the fuel supply to the burner.

(G) Effect of the Invention The present invention is a refrigeration cycle in which a compressor, a condenser, a decompression device, and an evaporator whose capacities can be changed are sequentially connected in an annular shape by a refrigerant pipe, and a heating device, a radiator, and a pump are connected by a brine pipe. With a brine circulation cycle that is connected in an annular shape, an evaporator is installed in the air passage that blows air into the room to be conditioned, and a radiator is installed on the leeward side of this evaporator, and the conditioned environment is cooled by the evaporator. In an air conditioner configured to heat the room air with a radiator to perform dehumidifying operation, during the dehumidifying operation, the temperature of the radiator has not reached a predetermined value after a certain time from the start of the dehumidifying operation, Or, if the temperature of the radiator is not higher than the temperature of the radiator at the start of dehumidifying operation by more than a predetermined temperature, it is judged that the heat source device is not operating, the compressor is set to low capacity, and the blower is operated intermittently. Or set to alternate operation of strength and weakness,
Since the dehumidifying effect can be obtained without cooling the controlled room too much, the dehumidifying effect can be obtained even when there is no abnormality in the brine circulation cycle such as the heating device and pump, and the radiator does not heat the operation. And can be maintained.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram of an air conditioner showing an embodiment of the present invention, FIG. 2 is a perspective view of the outdoor unit shown in FIG. 1, and FIG. 3 is a cover from the outdoor unit shown in FIG. FIG. 4 is a front view with the cover removed from the outdoor unit shown in FIG. 2, and FIG. 5 is a main part electronic used for the indoor unit of the air conditioner shown in FIG. A circuit diagram, FIG. 6 is a flow chart showing the operation of the microprocessor shown in FIG. 1 ... outdoor unit, 2 ... indoor unit, 3 ... compressor, 8 ... burner, 11 ... pump, 12 ... radiator, 30
...... Blower.

Claims (2)

[Claims] 1. A refrigeration cycle in which a compressor, a condenser, a decompression device, and an evaporator whose capacities can be changed are sequentially connected in a ring with a refrigerant pipe, and a heating device, a radiator, and a pump are connected in a ring with a brine pipe. And a brine circulation cycle consisting of
An evaporator is installed in the air path that blows air into the room to be conditioned, and a radiator is installed on the leeward side of this evaporator to heat the air in the room to be conditioned cooled by the radiator for dehumidification operation. In the air conditioner configured as described above, in the dehumidifying operation, when the temperature of the radiator does not reach the predetermined temperature after a certain time has passed from the start of the dehumidifying operation, the compressor is set to a low capacity and the room to be conditioned is set. Dehumidifying operation method for an air conditioner, characterized in that the air blown to the air conditioner is set to intermittent operation or alternating alternating operation of strength and weakness. 2. A refrigeration cycle in which a compressor, a condenser, a decompression device, and an evaporator whose capacity can be changed are sequentially connected in a ring with a refrigerant pipe, and a heating device, a radiator, and a pump are connected in a ring with a brine pipe. And a brine circulation cycle consisting of
An evaporator is installed in the air path that blows air into the room to be conditioned, and a radiator is installed on the leeward side of this evaporator to heat the air in the room to be conditioned cooled by the radiator for dehumidification operation. In the air conditioner configured as described above, in the dehumidifying operation, when the temperature of the radiator is not higher than the temperature of the radiator at the start of the dehumidifying operation by a predetermined temperature or more after a certain time from the start of the dehumidifying operation, the compressor has a low capacity. The method for dehumidifying operation of an air conditioner is characterized in that the air blown to the room to be conditioned is set to intermittent operation or alternating operation of strength and weakness.