JP2000205637A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly lower an indoor temperature by suitably controlling an indoor fan air volume and rapidly raising a capacity of a refrigerating cycle when cooling is started. SOLUTION: The air conditioner comprises a refrigerating cycle constituted by connecting a compressor, a condensing side heat exchanger, a flow control valve and an evaporating side heat exchanger, and by circulating a refrigerant, and a fan control means for changing an air volume of a fluid to be heat exchanged of the evaporating side exchanger, thereby operating in an operating pattern for controlling an inlet temperature and an outlet temperature of the fluid to be exchanged in the evaporating side exchanger. A fan air volume of the evaporating side exchanger is set to an intermediate value or above of a changing range irrespective of the pattern for controlling the inlet or outlet temperature of the fluid of the evaporating side exchanger when a cooling is started.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly, to an air conditioner for controlling the flow rate of a heat exchange fluid (indoor fan flow rate) of an evaporating heat exchanger.

[0002]

2. Description of the Related Art In an air conditioner, a compressor, a condensation side (outdoor side) heat exchanger, a flow rate control valve (expansion valve), and an evaporation side (indoor side) heat exchanger are connected in order by a pipe to form a refrigerant. A refrigeration cycle is configured to circulate water. An outdoor fan is installed in the condensation-side heat exchanger, and an indoor fan is installed in the evaporation-side heat exchanger.

[0003] As an air conditioner for automatically controlling the flow rate of a heat exchange fluid of an evaporation side heat exchanger, that is, the flow rate (rotational speed) of an indoor fan, one disclosed in, for example, JP-A-10-96545 is disclosed. is there. This air conditioner
The drive frequency (compressor frequency) of the inverter-controlled compressor, that is, the compressor capacity, is controlled according to the difference between the indoor temperature or the blown air temperature and the temperature set value (air conditioning load), and the indoor fan is controlled according to the compressor frequency. Is proportionally controlled.

[0004]

In the above-described conventional air conditioner, the air flow rate of the indoor fan is absolutely controlled in accordance with the compressor frequency. That is, the air flow rate of the indoor fan and the compressor frequency are different. Because of the fixed relationship, the air volume does not always match the state (indoor temperature) of the evaporating heat exchanger on the side of the fluid to be heat-exchanged (indoor temperature). turn into. For this reason, there is a problem that the low pressure side of the refrigeration cycle decreases, it takes time to stabilize the cycle, and it takes time until the proper performance is obtained.

Further, if the indoor fan is started at a low air flow when the compressor is started, the indoor load is high, and even if it is desired to immediately lower the indoor temperature, the cooling capacity is low, and it takes time to lower the indoor temperature. There is. In addition, even when high sensible heat operation is required in mechanical air conditioning or the like, there is a problem in that dehumidification is performed by lowering the evaporation temperature.

Further, since the indoor fan air volume and the compressor frequency are in a fixed relationship, the indoor fan air volume control is restricted by the operation side of the compressor, and the indoor fan air temperature or the indoor air temperature is controlled so as to approach the set value. In some cases, the fan cannot be controlled, and it takes time for the indoor intake air temperature or the blow-off air temperature to approach the set value.

Further, in the operation pattern in which the temperature difference between the indoor intake air temperature and the blow-out air temperature is set and the difference between the indoor intake air temperature and the blow-out air temperature is controlled in accordance with the temperature difference, the load on the indoor side changes due to some disturbance. If the temperature difference between the indoor intake air temperature and the outlet air temperature remains constant, it may take time for the indoor air to return to the proper state if There is a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and appropriately controls the air flow rate of an indoor fan to quickly increase the capacity of a refrigeration cycle at the start of a cooling operation, thereby rapidly increasing the indoor temperature. It is an object of the present invention to provide an air conditioner that can perform a cooling operation with high sensible heat and a quick dehumidifying operation, and can also stabilize indoor air temperature and indoor air temperature.

[0009]

In order to achieve the above object, an air conditioner according to the present invention connects a compressor, a condensing-side heat exchanger, a flow control valve, and an evaporating-side heat exchanger to transfer refrigerant. Forming a refrigeration cycle for circulation, having fan control means for changing the air volume of the heat exchange fluid in the evaporation side heat exchanger, and controlling an inlet temperature and an outlet temperature of the heat exchange fluid in the evaporation side heat exchanger; In the air-conditioning apparatus that is operated in the operation pattern of performing the operation, the fan control means, at the start of the cooling operation, regardless of the operation pattern that controls the inlet temperature or the outlet temperature of the heat exchange fluid of the evaporation-side heat exchanger.
The fan air volume of the evaporating heat exchanger is set to an intermediate value or more in a change range.

[0010] In the air conditioner according to the next invention, the air flow rate of the fan of the evaporation-side heat exchanger at the start of the cooling operation is set according to the inlet temperature of the heat exchange fluid or the outside air temperature.

[0011] The air conditioner according to the present invention constitutes a refrigerating cycle in which a refrigerant is circulated by connecting a compressor, a condensing-side heat exchanger, a flow control valve, and an evaporating-side heat exchanger. An air conditioner that has a fan control unit that changes the air volume of the heat exchange fluid to be heated, and is operated in an operation pattern that controls an inlet temperature of the heat exchange fluid in the evaporation-side heat exchanger, wherein the fan control unit includes: When the inlet temperature of the heat exchange fluid of the evaporation side heat exchanger is higher than a target value, control is performed to increase the fan airflow of the evaporation side heat exchanger to a current value or more.

[0012] The air conditioner according to the present invention constitutes a refrigeration cycle in which a refrigerant is circulated by connecting a compressor, a condensing-side heat exchanger, a flow control valve, and an evaporating-side heat exchanger. An air conditioner that has a fan control unit that changes the air volume of the heat exchange fluid to be heated, and is operated in an operation pattern that controls an inlet temperature of the heat exchange fluid in the evaporation-side heat exchanger, wherein the fan control unit includes: When the inlet temperature of the heat exchange fluid of the evaporation side heat exchanger is lower than the target value, control is performed to reduce the fan airflow of the evaporation side heat exchanger to a current value or less.

The air conditioner according to the present invention constitutes a refrigeration cycle in which a refrigerant is circulated by connecting a compressor, a condensing-side heat exchanger, a flow control valve, and an evaporating-side heat exchanger. An air conditioner that has a fan control unit that changes the air flow rate of the heat exchange fluid, and is operated in an operation pattern that controls an outlet temperature of the heat exchange fluid in the evaporation-side heat exchanger, wherein the fan control unit includes: When the inlet temperature of the heat exchange fluid of the evaporation side heat exchanger is higher than a target value, control is performed to increase the fan airflow of the evaporation side heat exchanger to a current value or more.

The air conditioner according to the present invention constitutes a refrigeration cycle in which a refrigerant is circulated by connecting a compressor, a condensing-side heat exchanger, a flow control valve, and an evaporating-side heat exchanger. An air conditioner that has a fan control unit that changes the air flow rate of the heat exchange fluid, and is operated in an operation pattern that controls an outlet temperature of the heat exchange fluid in the evaporation-side heat exchanger, wherein the fan control unit includes: When the inlet temperature of the heat exchange fluid of the evaporation side heat exchanger is lower than the target value, control is performed to reduce the fan airflow of the evaporation side heat exchanger to a current value or less.

The air conditioner according to the present invention constitutes a refrigeration cycle in which a refrigerant is circulated by connecting a compressor, a condensing-side heat exchanger, a flow control valve, and an evaporating-side heat exchanger. An air conditioner having fan control means for changing the air flow rate of the heat exchange fluid to be operated in an operation pattern for controlling a temperature difference between an inlet temperature and an outlet temperature of the heat exchange fluid in the evaporating heat exchanger. , During high sensible heat operation,
During the pull-down operation, the temperature difference between the inlet temperature and the outlet temperature of the heat exchange fluid of the evaporation side heat exchanger is set to be smaller than a reference value.

The air conditioner according to the present invention constitutes a refrigeration cycle in which a refrigerant is circulated by connecting a compressor, a condensing-side heat exchanger, a flow control valve, and an evaporating-side heat exchanger. An air conditioner having fan control means for changing the air flow rate of the heat exchange fluid to be operated in an operation pattern for controlling a temperature difference between an inlet temperature and an outlet temperature of the heat exchange fluid in the evaporating heat exchanger. When the inlet temperature of the heat exchange fluid of the evaporation side heat exchanger rises, the temperature difference between the inlet temperature and the outlet temperature of the heat exchange fluid of the evaporation side heat exchanger is set to be larger than a reference value. Things.

[0017]

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

(Overall Description) FIG. 1 shows an air conditioner including an indoor fan control device according to the present invention. The air conditioner has a compressor 1, an outdoor (condensing side) heat exchanger 2, a flow control valve (expansion valve) 3, and an indoor (evaporating side) heat exchanger 4, and these are sequentially piped. The refrigeration cycle is connected by loops 5, 6, 7, and 8 to circulate the refrigerant. An electric outdoor fan 9 is installed in the outdoor heat exchanger 2, and an electric indoor fan 10 is installed in the indoor heat exchanger 4. The compressor 1, the flow control valve 3, the indoor heat exchanger 4, and the indoor fan 10 are housed in an indoor unit 11, and the outdoor heat exchanger 2 and the outdoor fan 9 are housed in an outdoor unit 12. .

In the air conditioner having the above-described configuration, as a basic refrigeration cycle operation, the high-temperature and high-pressure gas refrigerant compressed by the compressor 1 flows into the outdoor heat exchanger 2 through the pipe 5, In the outdoor heat exchanger 2 in which the outside air is ventilated by the outdoor fan 9, the air is condensed and liquefied by heat exchange with the outside air. The liquid refrigerant reaches the flow control valve 3 through the pipe 11, where it is throttled to become a low-pressure two-phase refrigerant and flows into the indoor heat exchanger 4.

The low-pressure two-phase refrigerant exchanges heat with the indoor air in the indoor heat exchanger 4 through which the indoor air is passed by the indoor fan 10 to lower the indoor air and gasify it. This gas refrigerant is sucked into the compressor 1 again. Thereby, the cooling operation is performed. The indoor unit 11 includes an indoor fan control device 13 for controlling the air flow rate (fan rotation speed) of the indoor fan 10, and the temperature of the indoor air as the heat exchange fluid sucked into the indoor heat exchanger 4 (the suction air Temperature Ti
i) An intake air temperature sensor (inlet temperature sensor) that detects i) and an outlet air temperature sensor (outlet temperature sensor) that detects the temperature (outlet air temperature Tio) of the heat exchanged fluid blown out from the indoor heat exchanger 4. 15 are provided. Further, the outdoor unit 12 is provided with an outside air temperature sensor 16 for detecting the temperature (outside air temperature To) of the outdoor air as the heat exchange fluid sucked into the outdoor heat exchanger 2.

The indoor unit 11 is also provided with control means for controlling the operation of the compressor 1 and the outdoor fan 9, but these controls may be performed in the same manner as the conventional one. A description of control means for controlling the operation of the outdoor fan 9 and the outdoor fan 9 will be omitted.

The indoor fan control device 13 is of a microcomputer type, and has a suction air temperature sensor 14,
A temperature signal is input from each of the blow-out air temperature sensor 15 and the outside air temperature sensor 16, and according to a set value of the indoor suction air temperature or the indoor blow-out air temperature, or according to a temperature difference between the indoor suction air temperature and the indoor blow-out air temperature, The capacity of the indoor fan 10 is controlled at a regular time cycle, for example, a cycle of 20 seconds, and the heat exchange capacity of the indoor heat exchanger 4 is operated.

(Start-up control) Indoor fan controller 13
Sets the air flow (capacity) of the indoor fan 10 at the time of starting the compressor at the start of operation to be equal to or more than the intermediate value of the control range, as shown in FIG. Thereby, it is possible to prevent the low pressure from being pulled in at the time of starting the refrigeration cycle, to stabilize the refrigeration cycle at an early stage, and to quickly supply a necessary cooling capacity.

As shown in FIG. 3, the capacity of the indoor fan 10 at the start of operation is set to a minimum value of 50% and the indoor intake air temperature (indoor temperature) Tii detected by the intake air temperature sensor 14. Accordingly, the optimum setting can be made in the range of 50% to 100%. As a result, when the room temperature is high and a large capacity is required, the air volume of the indoor fan 10 is increased, and the required cooling capacity can be quickly supplied.

As shown in FIG. 4, the minimum capacity of the indoor fan 10 at the start of operation is set to 50%.
The optimum setting may be in the range of 50% to 100% according to the outdoor intake air temperature (outside air temperature) To detected by the outside air temperature sensor 16. As a result, when the outside air temperature To is high and a large capacity is required, the air volume of the indoor fan 10 is increased, and the required cooling capacity can be quickly supplied.

(Operation Pattern for Controlling Indoor Suction Air Temperature) In the operation pattern for controlling the indoor suction air temperature Tii, as an example of a control target range, as shown in FIG. , Set value (target value of indoor suction air temperature) -0.5 ° C to + 0.5 ° C
The control is performed with hysteresis on the plus side as the target range of control. During normal operation, when the indoor suction air temperature Tii is in the range A higher than the suction air temperature target value, it is expected that the indoor load is high, such as during pull-down, and the cooling capacity is increased, and the indoor temperature is increased. Need to lower.

In response to this, the indoor fan controller 13 determines that if the indoor suction air temperature Tii is in the range A,
In the indoor fan control every 20 seconds, control is performed to increase the indoor fan airflow to a current value or more, for example, to a maximum.

The indoor suction air temperature Tii is in the range C
, The indoor air temperature is on the rise,
It is considered that the cooling capacity is slightly smaller than the indoor load.
Therefore, it is considered necessary to increase the cooling capacity by increasing the indoor fan air volume. However, since the indoor suction air temperature Tii is not far from the set range,
Unnecessary increase in the indoor fan air volume is due to the indoor suction air temperature T
ii may cause hunting.

In response to this, if the indoor suction air temperature Tii is in the range C, the indoor fan control device 13
In the indoor fan control every 20 seconds, only the reduction of the indoor fan air volume is prohibited. As a result, a decrease in the cooling capacity is prevented, and it is possible to select an increase in the air flow rate of the indoor fan or to maintain the current state as necessary, thereby stabilizing the indoor intake air temperature Tii within the target range.

When the indoor intake air temperature Tii is in the range B lower than the intake air temperature target value, there is no particular restriction on the indoor fan control.

(Another Example of Operation Pattern for Controlling Indoor Suction Air Temperature) In an operation pattern for controlling the indoor intake air temperature, another example of a control target range is shown in FIG. 6, for example. As described above, the set value (target value of the indoor suction air temperature) is -0.5 ° C. to +0.
Control may be performed with a hysteresis on the minus side with a range of 5 ° C. as a target range of control.

During normal operation, the indoor intake air temperature Tii
Is in the range E, the indoor air temperature tends to decrease, and the cooling capacity is considered to be slightly larger than the indoor load. For this reason, it is considered necessary to reduce the air flow rate of the indoor fan to reduce the cooling capacity. However, since the indoor suction air temperature Tii does not greatly deviate from the set range, an unnecessary decrease in the indoor fan air volume may cause hunting of the suction air temperature Tii.

In response to this, if the indoor suction air temperature Tii is in the range E, the indoor fan control device 13
In indoor fan control every 20 seconds, only increasing the indoor fan air volume is prohibited. As a result, it is possible to prevent an increase in the cooling capacity, to reduce the indoor fan airflow or maintain the current state as necessary, and to stabilize the indoor intake air temperature Tii within the target range.

When the indoor intake air temperature Tii is in the range F lower than the intake air temperature target value, the indoor air temperature is lower than the set value, and it is necessary to lower the cooling capacity and raise the indoor temperature. .

In response to this, if the indoor suction air temperature Tii is in the range F, the indoor fan control device 13
In the indoor fan control every 20 seconds, control is performed so that the indoor fan air volume is reduced to a current value or less, for example, to a minimum.

The indoor suction air temperature Tii is in the range D.
, There is no particular restriction on the control of the indoor fan.

(Operation Pattern for Controlling Blowing Air Temperature) Normally, when the indoor fan airflow is increased, the indoor blowing air temperature Tio is increased, and when the indoor fan airflow is reduced,
The indoor blowing air temperature Tio decreases. In the operation pattern for controlling the indoor blowout air temperature Tio, for example, when the indoor suction air temperature Tii is high, such as during pull-down, the indoor fan airflow is reduced by the relationship between the indoor fan airflow and the indoor blowout air temperature, and the indoor fan airflow is reduced. Attempts to lower the blown air temperature.

However, this is because the indoor suction air temperature Ti
From the viewpoint of the i side, the air flow rate of the indoor fan is reduced, and the cooling capacity is reduced, although the pull-down condition is required to increase the cooling capacity. As a result, the indoor intake air temperature Tii does not decrease, and in some cases, the indoor exhaust air temperature Tio does not decrease to the target value. It is also expected that the same phenomenon occurs when the room intake air temperature Tii is too low with respect to the target value.

Therefore, in the case of the operation pattern of controlling the indoor air temperature Tio, first, the indoor air temperature Tii is reduced to an appropriate temperature to some extent.
It can be said that it is necessary to control the outlet air temperature Tio.

FIG. 7 shows an example of the indoor fan control characteristics in the case of the operation pattern for controlling the blown air temperature Tio. The indoor intake air temperature target value is automatically set to a value obtained by adding several degrees C, for example, 8 degrees C, to a preset target value of the indoor discharge air temperature. As a target range of the indoor blowout air temperature control, for example, a range of −0.5 ° C. to + 0.5 ° C. of a set value (a target value of the indoor blowout air temperature) is set as a target range of the control.

First, when the indoor intake air temperature Tii is in the range G higher than the intake air temperature target value, it is expected that the indoor load is high such as at the time of pull-down, so that the cooling capacity is increased and the indoor temperature is reduced. Need to be done.

In response to this, if the indoor suction air temperature Tii is in the range G, the indoor fan control device 13
In the indoor fan control every 20 seconds, control is performed to increase the indoor fan airflow to a current value or more, for example, to a maximum.

The indoor suction air temperature Tii is in the range H
, The indoor air temperature is on the rise,
It is considered that the cooling capacity is slightly smaller than the indoor load.
Therefore, it is considered necessary to increase the cooling capacity by increasing the indoor fan air volume. However, since the indoor suction air temperature Tii is not far from the set range,
Unnecessary increase in the indoor fan air volume is due to the indoor suction air temperature T
ii may cause hunting.

In response to this, if the indoor suction air temperature Tii is in the range H, the indoor fan control device 13
In the indoor fan control every 20 seconds, only the reduction of the indoor fan air volume is prohibited. As a result, a decrease in the cooling capacity is prevented, and it is possible to select an increase in the air flow rate of the indoor fan or to maintain the current state as necessary, thereby stabilizing the indoor intake air temperature Tii within the target range.

When the indoor suction air temperature Tii is within the range I, the indoor fan air flow is controlled so as not to control the indoor fan air flow based on the indoor suction air temperature Tii but to adjust the blow air temperature Tio to the target value.

According to the above-described control, first, the indoor intake air temperature Tii is adjusted to an appropriate range, and then the indoor fan airflow is controlled so that the indoor blown air temperature Tio approaches a target value, thereby stabilizing the indoor blown air temperature Tio. Is achieved.

(Another Example of Operation Pattern for Controlling Outlet Air Temperature) FIG. 8 shows another example of indoor fan control characteristics in the case of an operation pattern for controlling the outlet air temperature Tio. Also in this case, the indoor intake air temperature target value is automatically set to a value obtained by adding several degrees C, for example, 8 degrees C, to a preset indoor air discharge air temperature target value. As a target range of the indoor blowout air temperature control, for example, a range of −0.5 ° C. to + 0.5 ° C. of a set value (a target value of the indoor blowout air temperature) is set as a target range of the control.

During normal operation, when the indoor suction air Tii is in the range K, the indoor air has a downward tendency,
It is considered that the cooling capacity is slightly larger than the indoor load.
For this reason, it is considered necessary to reduce the air flow rate of the indoor fan to reduce the cooling capacity. However, indoor suction air T
Since ii is not far from the set range, an unnecessary decrease in the air volume of the indoor fan may cause hunting of the intake air.

In response to this, if the indoor suction air temperature Tii is in the range K, the indoor fan control device 13
In indoor fan control every 20 seconds, only increasing the indoor fan air volume is prohibited. As a result, it is possible to prevent an increase in the cooling capacity, to reduce the indoor fan air flow or maintain the current state as necessary, and to stabilize the indoor intake air temperature within the target range.

When the indoor intake air temperature Tii is in the range L lower than the intake air temperature target value, the indoor air temperature is lower than the set value, and it is necessary to lower the cooling capacity and raise the indoor temperature. .

In response to this, if the indoor suction air temperature Tii is in the range L, the indoor fan control device 13
In the indoor fan control every 20 seconds, control is performed so that the indoor fan air volume is reduced to a current value or less, for example, to a minimum.

When the indoor intake air Tii is in the range L lower than the intake air temperature target value, the indoor air temperature is lower than the set value, the cooling capacity needs to be reduced, and the indoor temperature needs to be raised. When the indoor suction air temperature Tii is in the range J, the indoor fan air flow is controlled so as not to control the indoor fan air flow based on the indoor suction air temperature Tii but to adjust the indoor blow air temperature Tio to the target value.

According to the above-mentioned control, first, the indoor intake air temperature Tii is adjusted to an appropriate range, and then the indoor fan air volume is controlled so that the indoor blown air temperature Tio approaches a target value, thereby stabilizing the indoor blown air temperature Tio. Is achieved.

(Operation Pattern for Controlling the Difference Between Indoor Inlet Air Temperature and Indoor Outlet Air Temperature) A target value (for example, 8 deg) of the difference between the indoor intake air temperature Tii and the indoor outlet air temperature Tio is set in advance.

In the normal control, the indoor suction air temperature Ti
i does not change immediately because the thermal capacity of the indoor load is large. Therefore, when controlling the difference between the indoor intake air temperature Tii and the indoor blowout air temperature Tio, the indoor blowout air temperature Tio is mainly controlled.

Here, consider the case where the compressor 1 is started and the pull-down operation is started. Here, when the normal indoor fan control is performed, the indoor fan airflow is controlled so that the difference between the indoor intake air temperature Tii and the indoor blowout air temperature Tio is set to 8 deg. At this time, the indoor fan control device 13 determines the preset indoor suction air temperature Ti
The setting is automatically changed so that the target value of the difference between i and the indoor air temperature Tio becomes smaller than the set value (reference value). Here, for example, the difference is changed so as to have a difference of 4 degrees.

By this control, the indoor fan control device 13
Controls the indoor fan air volume to increase in order to increase the indoor air outlet temperature Tio so as to bring the difference between the indoor air inlet air temperature Tii and the indoor air outlet air temperature Tio closer to a target value. And the room intake air temperature Tii decreases quickly.

Although the pull-down operation has been described, this control can be used even when the air conditioner is installed in a machine room or the like and a high sensible heat operation is required. Further, the setting of the difference 8 deg between the indoor suction air temperature Tii and the indoor discharge air temperature Tio is changed to 4 deg. However, it may be changed according to the difference between the indoor suction air temperature Tii and the target value of the indoor suction air temperature or the ratio of high sensible heat. .

Next, consider a case where the room air temperature in the steady state has risen due to disturbance such as entry of a person or opening of a window. In this case, in order to return the air-conditioned space to a comfortable state, it is necessary to first remove the humidity that has entered from the outside. Therefore, the indoor fan controller 13 automatically changes the difference between the preset indoor intake air temperature Tii and the indoor blowout air temperature Tio to be larger than the reference value (8 deg). Here, it is set to 12 deg as an example.

As a result, the indoor fan control device 13
In order to lower the indoor air temperature Tio and bring the difference between the indoor air temperature Tii and the indoor air temperature Tio closer to the target value, control is performed so as to reduce the indoor fan air volume,
As a result, the evaporation temperature in the indoor heat exchanger 4 is reduced, and the dehumidifying operation is performed, so that the indoor air quickly returns to a comfortable state.

In the above-described embodiment, the difference between the indoor intake air temperature Tii and the indoor discharge air temperature Tio is 8d.
Although the setting of eg was changed to 12 deg, the degree of increase in humidity was estimated from the degree of increase in the indoor suction air temperature Tio,
Indoor intake air temperature Tii and indoor exhaust air temperature Tio
May be determined.

[0062]

As will be understood from the above description, according to the air conditioner of the present invention, at the time of starting the cooling operation, the operation for controlling the inlet temperature or the outlet temperature of the heat exchange fluid of the evaporating heat exchanger. Regardless of the pattern, the fan air volume of the evaporating heat exchanger is set to a value equal to or higher than the middle value of the change range, so that the low pressure of the refrigeration cycle is prevented and the cooling capacity is quickly increased, and the high sensible heat operation is also performed. Becomes possible.

According to the air conditioner of the next invention,
Since the fan air volume of the evaporator-side heat exchanger at the start of cooling operation is set according to the inlet temperature of the heat exchange fluid or the outside air temperature, the fan air volume of the evaporator-side heat exchanger at the start of cooling operation is set appropriately. Thus, the low pressure of the refrigeration cycle is prevented from being pulled in, the cooling capacity is quickly increased, and the high sensible heat operation can be performed.

According to the air conditioner of the next invention,
In an air conditioner operating with an operation pattern that controls the inlet temperature of the heat exchange fluid in the evaporation side heat exchanger, if the inlet temperature of the heat exchange fluid in the evaporation side heat exchanger is higher than the target value, the evaporation side Since the fan airflow of the heat exchanger increases to the current value or more, the cooling capacity is increased, the control mainly of the cooling capacity can be performed, and the indoor suction air temperature can be stabilized.

According to the air conditioner of the next invention,
In an air conditioner operating with an operation pattern that controls the inlet temperature of the heat exchange fluid in the evaporation side heat exchanger, if the inlet temperature of the heat exchange fluid in the evaporation side heat exchanger is lower than the target value, the evaporation side Since the fan air volume of the heat exchanger is reduced to the current value or less, the cooling capacity is reduced, the cooling capacity can be mainly controlled, and the indoor suction air temperature can be stabilized.

According to the air conditioner of the next invention,
In an air conditioner operating with an operation pattern that controls the outlet temperature of the heat exchange fluid in the evaporation side heat exchanger, if the inlet temperature of the heat exchange fluid in the evaporation side heat exchanger is higher than a target value, the evaporation side Since the fan airflow of the heat exchanger increases to the current value or more, it is possible to provide the capacity corresponding to the load, and to stabilize the temperature of the indoor blown air.

According to the air conditioner of the next invention,
In an air conditioner operating with an operation pattern that controls the outlet temperature of the heat exchange fluid in the evaporation side heat exchanger, if the inlet temperature of the heat exchange fluid in the evaporation side heat exchanger is lower than the target value, the evaporation side Since the fan airflow of the heat exchanger is reduced to the current value or less, it is possible to provide the capacity corresponding to the load, and it is possible to obtain the stable temperature of the indoor air.

According to the air conditioner of the next invention,
In an air conditioner that operates with an operation pattern that controls the temperature difference between the inlet temperature and the outlet temperature of the heat exchange fluid in the evaporation side heat exchanger, the heat exchange fluid in the evaporation side heat exchanger during high sensible heat operation and pull-down operation Since the temperature difference between the inlet temperature and the outlet temperature is set to be smaller than the reference value, the amount of air passing through the evaporating-side heat exchanger increases, so that a high-sensible heat cooling operation and an efficient pull-down operation can be performed.

According to the air conditioner of the next invention,
In an air conditioner operating with an operation pattern that controls the temperature difference between the inlet temperature and the outlet temperature of the heat exchange fluid in the evaporation side heat exchanger, when the inlet temperature of the heat exchange fluid in the evaporation side heat exchanger rises Since the temperature difference between the inlet temperature and the outlet temperature of the heat exchange fluid of the heat exchanger of the generating side is set to be larger than the reference value, the air volume passing through the evaporating side heat exchanger decreases,
Dehumidifying operation can be performed quickly to quickly return to comfortable indoor air.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram showing one embodiment of an air conditioner according to the present invention.

FIG. 2 is a flowchart illustrating a method of controlling an indoor fan at the time of startup in the air-conditioning apparatus according to the present invention.

FIG. 3 is a graph showing the relationship between the temperature of the indoor intake air at the time of startup and the capacity of the indoor fan at the start of operation in the air conditioner according to the present invention.

FIG. 4 is a graph showing the relationship between the outside air temperature at startup and the capacity of the indoor fan at the start of operation in the air-conditioning apparatus according to the present invention.

FIG. 5 is a diagram showing an example of the control characteristics of the indoor fan in the case of an operation pattern for controlling the intake air temperature in the air conditioner according to the present invention.

FIG. 6 is a diagram showing another example of the control characteristics of the indoor fan in the case of the operation pattern for controlling the intake air temperature in the air conditioner according to the present invention.

FIG. 7 is a diagram showing an example of the control characteristics of the indoor fan in the case of the operation pattern for controlling the blow-out air temperature in the air conditioner according to the present invention.

FIG. 8 is a diagram showing another example of the control characteristics of the indoor fan in the case of the operation pattern for controlling the blown air temperature in the air conditioner according to the present invention.

[Explanation of symbols]

1 compressor, 2 outdoor heat exchanger, 3 flow control valve 4
Indoor heat exchanger, 9 outdoor fan, 10 indoor fan,
11 indoor unit, 12 outdoor unit, 13
Indoor fan control device, 14 Suction air temperature sensor, 1
5 Outlet air temperature sensor, 16 Outside air temperature sensor.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Seiji Inoue 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term in Mitsubishi Electric Corporation (reference) 3L061 BE02 BF01 BF02 BF03

Claims (8)

[Claims] 1. A refrigeration cycle for circulating a refrigerant by connecting a compressor, a condensing-side heat exchanger, a flow rate control valve, and an evaporating-side heat exchanger, and a flow rate of a heat exchange fluid of the evaporating-side heat exchanger. An air conditioner that has a fan control means for changing the temperature of the heat-exchange fluid and operates at an operation pattern for controlling the inlet temperature and the outlet temperature of the heat exchange fluid in the evaporation-side heat exchanger, wherein the fan control means starts a cooling operation. Sometimes, regardless of an operation pattern for controlling the inlet temperature or the outlet temperature of the heat exchange fluid of the evaporating heat exchanger, the fan airflow of the evaporating heat exchanger is set to be equal to or more than a middle value of a change range. And air conditioners. 2. The air conditioner according to claim 1, wherein a fan air volume of the evaporating heat exchanger at the start of the cooling operation is set according to an inlet temperature of the heat exchange fluid or an outside air temperature. . 3. A refrigeration cycle for circulating a refrigerant by connecting a compressor, a condensing-side heat exchanger, a flow rate control valve, and an evaporating-side heat exchanger, and a flow rate of a heat exchange fluid of the evaporating-side heat exchanger. An air conditioner having a fan control means for changing the temperature of the evaporating heat exchanger, the fan controlling means being operated in an operation pattern for controlling an inlet temperature of the heat exchange fluid in the evaporating heat exchanger. An air conditioner, wherein when the inlet temperature of the heat exchange fluid is higher than a target value, control is performed to increase the fan airflow of the evaporation side heat exchanger to a current value or more. 4. A refrigeration cycle for circulating a refrigerant by connecting a compressor, a condensing-side heat exchanger, a flow rate control valve, and an evaporating-side heat exchanger, and a flow rate of a heat exchange fluid of the evaporating-side heat exchanger. An air conditioner having fan control means for changing the temperature of the evaporating heat exchanger, the fan controlling means being operated in an operation pattern for controlling the inlet temperature of the heat exchange fluid in the evaporating heat exchanger. An air conditioner, wherein when the inlet temperature of the heat exchange fluid is lower than a target value, control is performed to reduce a fan air volume of the evaporation side heat exchanger to a current value or less. 5. A refrigeration cycle for circulating a refrigerant by connecting a compressor, a condensing-side heat exchanger, a flow rate control valve, and an evaporating-side heat exchanger, wherein an air flow rate of a heat-exchange fluid of the evaporating-side heat exchanger An air conditioner having a fan control means for changing the temperature of the evaporating heat exchanger, the fan controlling means being operated in an operation pattern for controlling an outlet temperature of the heat exchange fluid in the evaporating heat exchanger. An air conditioner, wherein when the inlet temperature of the heat exchange fluid is higher than a target value, control is performed to increase the fan airflow of the evaporation side heat exchanger to a current value or more. 6. A refrigeration cycle for circulating a refrigerant by connecting a compressor, a condensing-side heat exchanger, a flow rate control valve, and an evaporating-side heat exchanger, wherein an air volume of a heat exchange fluid of the evaporating-side heat exchanger An air conditioner having a fan control means for changing the temperature of the evaporating heat exchanger, the fan controlling means being operated in an operation pattern for controlling an outlet temperature of the heat exchange fluid in the evaporating heat exchanger. An air conditioner, wherein when the inlet temperature of the heat exchange fluid is lower than a target value, control is performed to reduce a fan air volume of the evaporation side heat exchanger to a current value or less. 7. A refrigeration cycle for circulating a refrigerant by connecting a compressor, a condensing-side heat exchanger, a flow rate control valve, and an evaporating-side heat exchanger, and a flow rate of a heat exchange fluid of the evaporating-side heat exchanger. An air conditioner having a fan control means for changing the temperature and operating in an operation pattern for controlling the temperature difference between the inlet temperature and the outlet temperature of the heat exchange fluid in the evaporating heat exchanger, wherein during high sensible heat operation, An air conditioner wherein during operation, a temperature difference between an inlet temperature and an outlet temperature of the heat exchange fluid of the evaporation side heat exchanger is set to be smaller than a reference value. 8. A refrigeration cycle for circulating a refrigerant by connecting a compressor, a condensing-side heat exchanger, a flow rate control valve, and an evaporating-side heat exchanger, wherein an air volume of a heat exchange fluid of the evaporating-side heat exchanger An air conditioner having fan control means for changing the temperature of the evaporating heat exchanger, and operating in an operation pattern for controlling a temperature difference between an inlet temperature and an outlet temperature of the heat exchange fluid in the evaporating heat exchanger, When the inlet temperature of the heat exchange fluid increases, the temperature difference between the inlet temperature and the outlet temperature of the heat exchange fluid of the evaporating heat exchanger is set to be larger than a reference value. apparatus.