JPH05256497A - Controlling method for dry operation of air conditioner - Google Patents

Abstract

PURPOSE:To efficiently perform a drying operation while isothermally dehumidifying. CONSTITUTION:A method for controlling a drying operation of an air conditioner in which a variable capacity compressor 1, an indoor heat exchanger 9, a pressure reducing unit 5 and an outdoor heat exchanger are sequentially connected and an indoor fan 12 and an electric heater 10 are provided in the exchanger comprises the steps of suitably repeating a dehumidifying zone in which a rotating speed of an indoor fan 12 is varied during drying operation and a capacity of the compressor 1 is enhanced at the time of rotating the fan 12 at a low speed and a circulating zone in which the capacity of the compressor 1 is reduced at the time of rotating the fan 12 at a high speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry operation control method for performing a dry operation in an air conditioner.

[0002]

2. Description of the Related Art Conventionally, a dry operation (dehumidification operation) performed in an air conditioner is an operation in a cooling cycle in which air dehumidified in an indoor heat exchanger is reheated by an electric heater. In this dry operation control, the compressor is operated at a low frequency to suppress the cooling capacity as much as possible, and the cooling operation is performed to correspond to the reheating capacity of the electric heater. Further, the indoor fan is operated at a low rotational speed to suppress an increase in the amount of sensible heat of dehumidified air and prevent the evaporation temperature of the refrigerant in the indoor heat exchanger from becoming higher than the dew point temperature.

[0003]

By the way, since the electric heater uses a high capacity heater of 300 to 500 W for heating backup, the sensible heat amount increases and the evaporation temperature becomes higher than the dew point temperature depending on the operating condition. Dehumidification may not be performed. In this case, it is conceivable to increase the operating frequency of the compressor to reduce the evaporation temperature, but there is a problem that the input increases with respect to the dehumidification amount and the efficiency decreases,
Further, when the cooling capacity is increased, the heating capacity of the electric heater cannot be supported, and there is a problem that the room to be dehumidified is cooled.

Therefore, an object of the present invention is to solve the above-mentioned problems and to provide an operation control method for a dry air conditioner capable of efficiently performing a dry operation while isothermally dehumidifying.

[0005]

In order to achieve the above object, the present invention provides a variable capacity compressor, an indoor heat exchanger, a pressure reducing device, and an outdoor heat exchanger, which are sequentially connected, and an indoor fan and an indoor fan. In an operation control method of an air conditioner dry air conditioner equipped with an electric heater, a dehumidifying section in which the rotation of an indoor fan is changed during dry operation and the compressor capacity is increased when the indoor fan is at a low speed, and the rotation of the indoor fan. And a circulate section in which the capacity of the compressor is reduced when the rotation speed is high. In operating the dehumidifying section and the circulate section, the compressor is kept at constant rotation and the rotation of the indoor fan is changed to lower the evaporation temperature at low speed, and the evaporation temperature is raised at high speed. The operation in the circulated section is alternately repeated.

[0006]

According to the above construction, the rotation of the indoor fan and the capacity of the compressor are changed during the dry operation to divide into a dehumidifying section and a circulating section, which are alternately repeated to enhance dehumidification mainly in the dehumidifying section. In the circulated section, the optimum dry operation can be performed by increasing the sensible heat of dehumidified air.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a heat pump cycle of an air conditioner according to the present invention.
The four-way valve 2, the outdoor heat exchanger 4, the pressure reducing device 5, and the indoor heat exchanger 9 are sequentially connected to form a heat pump cycle.

The indoor heat exchanger 9 is provided with an indoor fan 12 and a motor 11 for the indoor fan 12, and an electric heater 10 (300 to 300) for backup during heating operation and during dry operation.
(About 500 W) is provided.

The outdoor heat exchanger 4 is provided with an outdoor fan 14 and its motor 13.

An outdoor connection portion 6 is connected to the outdoor refrigerant pipe, an indoor connection portion 8 is connected to the outdoor refrigerant pipe, and these are connected by an indoor / outdoor connection pipe 7. Further, the cycle is provided with a defrosting two-way valve 3 for performing a defrosting operation by flowing a part of the high-temperature high-pressure gas of the compressor 1 into the outdoor heat exchanger 4.

The compressor 1 on the outdoor side is driven by an inverter device 15 in a variable capacity, and the inverter device 15 is driven at a command frequency from the outdoor control part 19 and the outdoor control part 19 drives a motor 13. It is like this.

The indoor motor 11 is controlled by the indoor control unit 16 so that the rotation speed is variable.

As shown in FIG. 2, the indoor heat exchanger 9 is provided with an indoor heat exchange sensor 17 for detecting the indoor heat exchanger temperature and a room temperature sensor 18 for detecting the indoor temperature.

In the above, in the normal cooling operation, the high-temperature high-pressure refrigerant gas from the compressor 1 is passed through the outdoor heat exchanger 4 to radiate (condense) it and reduce the pressure by the pressure reducing device, and then absorb the heat by the indoor heat exchanger 9. (Evaporation) and the evaporated refrigerant gas is compressed by the compressor 1
In the heating operation, the four-way valve 2 is switched to flow the high-temperature high-pressure refrigerant gas into the indoor heat exchanger 9 to radiate (condense) it, and the outdoor heat exchanger 4 absorbs the heat (evaporates) to evaporate the refrigerant. The gas is returned to the compressor 1.

Next, the dry operation of the present invention will be described.

First, the indoor control unit 16 selects a dry operation when a dry operation command is issued by a remote controller or the like, changes the rotation speed of the indoor fan 12, and changes the operation capacity of the compressor 1. In this case, the indoor control unit 16
Indicates that the indoor fan 12 has a low rotation speed (for example, 100 rp).
When it is m or stopped, the compressor 1 has a high capacity (for example, 16H).
z), the dehumidifying section operation and the circulating section operation in which the compressor 1 is operated at a low capacity (eg, 10 Hz) when the indoor fan 12 is rotating at a high speed (eg, 400 rpm) are alternately repeated.

By alternately switching the dehumidifying section operation and the circulating section operation during the dry operation as described above, dehumidification of air is promoted in the defrosting section, and the dehumidifying section becomes chilly in the circulate section. By increasing the sensible heat of the dehumidified air, it is possible to dehumidify at a substantially isothermal temperature and to perform an efficient dry operation.

The switching between the dehumidifying section operation and the circulating section operation is switched by the temperature detected by the heat exchange sensor 17, for example.

FIG. 2 shows an example in which the heat exchange sensor 17 is used for switching. Two types of evaporation temperatures TC for switching the rotation of the indoor fan 12 and the capacity of the compressor 1 are displayed in the indoor control section 16.
1 and TC2 are stored, and for example, when the evaporation temperature detected by the heat exchange sensor 17 rises and exceeds the lower limit temperature TC1, the indoor fan 12 is switched to high rotation after a lapse of T1 time, and conversely, the evaporation temperature. Is lower than the lower limit temperature TC1, T
After one hour, the indoor fan 12 is switched to low speed.

In the compressor 1, the evaporation temperature is the upper limit temperature TC2.
When the temperature exceeds T2, the compressor 1 is switched to a high capacity after a lapse of T2. On the contrary, when the evaporation temperature is lower than TC2, the capacity remains high and the evaporation temperature is lower than the lower limit temperature TC1. The compressor 1 is controlled to switch to a low capacity after T1 time and further T3 time.

By controlling as described above, the circulate section and the dehumidifying section can be alternately repeated.

FIG. 4 shows, for example, that the room temperature is 27 ° C. and the humidity is 60.
Another example of switching between the dehumidifying section operation and the circulating section operation of the dry operation control when the value is% is shown. In the indoor fan 12, as shown in FIG.
pm), stop, high rotation (400 rpm), and intermittently, for example, by fluctuation control with a cycle of 1 / f, and the compressor does not change its capacity, but the indoor fan, as shown in FIG. When the rotation speed is low (dehumidification section), the evaporation temperature is low, and when the rotation speed is high (circulation section), the evaporation temperature is high and is higher than the dew point temperature shown by the diagonal lines in the figure, thereby substantially condensing. Water can be prevented.

FIG. 5 shows that the room temperature is 27 ° C. and the humidity is 60.
In another example of switching between the dehumidifying section operation and the circulating section operation of the dry operation control at the time of%, the indoor fan 12 is rotated at a low rotation speed (100 r) as shown in FIG.
pm), stop, and high rotation (400 rpm) are intermittently switched. At the same time, as shown in FIG. 5B, when the fan is low rotation (dehumidification section), the capacity of the compressor is high (operating frequency 16
Hz), slightly higher when stopped (operating frequency 13H
z), and when the fan is rotating at high speed (circulation section)
By controlling its capacity to a low level (operating frequency 10 Hz), the evaporation temperature of the indoor heat exchanger can be adjusted as shown in FIG. 5 (c), and optimal dry operation can be performed.

[0025]

In summary, according to the present invention, during the dry operation, the rotation of the indoor fan and the capacity of the compressor are changed to divide into a dehumidifying section and a circulating section, and by repeating this alternately, a main dehumidifying section is obtained. By increasing the dehumidification and increasing the sensible heat of the dehumidified air in the circulated section, optimum dry operation can be performed.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing details on the indoor side of FIG.

FIG. 3 is a diagram showing a pattern of dry operation control in the present invention.

FIG. 4 is a diagram showing another pattern of dry operation control in the present invention.

FIG. 5 is a diagram showing still another pattern of the dry operation control in the present invention.

[Explanation of symbols]

 1 Compressor 4 Outdoor Heat Exchanger 5 Pressure Reduction Device 9 Indoor Heat Exchanger 10 Electric Heater 12 Indoor Fan 16 Indoor Control Unit

Claims (2)

[Claims] 1. An operation control method for an air conditioner dry air conditioner in which a variable capacity compressor, an indoor heat exchanger, a pressure reducing device, and an outdoor heat exchanger are sequentially connected, and an indoor fan and an electric heater are provided in the indoor heat exchanger. During the dry operation, the rotation of the indoor fan is changed and the dehumidifying section where the compressor capacity is increased when the indoor fan is at low rotation, and the circulate section where the compressor capacity is reduced when the indoor fan is rotating at high rotation A method for controlling dry operation of an air conditioner, characterized in that and are repeated appropriately. 2. An operation control method for an air conditioner dry air conditioner in which a variable capacity compressor, an indoor heat exchanger, a pressure reducing device, and an outdoor heat exchanger are sequentially connected, and an indoor fan and an electric heater are provided in the indoor heat exchanger. , The dehumidifying section where the rotation of the indoor fan is changed during dry operation and the evaporation temperature of the indoor heat exchanger is lowered when the indoor fan is at low rotation, and the evaporation temperature of the indoor heat exchanger when the rotation of the indoor fan is at high rotation A method for controlling dry operation of an air conditioner, which comprises appropriately repeating a circulated section in which the temperature is increased.