KR101070186B1 - Direct expansion air handling unit having apparatus for automatic controlling air volum of blower by change of refrigerant flow - Google Patents

Abstract

The present invention relates to a direct expansion type air conditioner having an automatic blower air flow control device according to a change in refrigerant flow rate, the purpose of which is to automatically adjust the air flow rate of the discharge and suction blower constituting the air conditioner according to the flow rate of the refrigerant supplied to the heat exchanger When the indoor temperature is stabilized and the operation amount of the outdoor unit decreases or the flow rate of the refrigerant decreases, the operating cost of the blower can be reduced by adjusting the blower volume by adjusting the output of the motor. The present invention provides a direct expansion type air conditioner having an air blower automatic control device capable of maintaining a high temperature.
According to an aspect of the present invention, there is provided a direct expansion type large-capacity EHP (GHP) type air conditioner, comprising: a control controller for controlling an electronic expansion valve whose opening amount is controlled by opening and closing to adjust a flow rate of a refrigerant supplied to a heat exchanger of the air conditioner; One or more control controllers connected to the electronic expansion valves installed in each heat exchanger are connected to the circuit to collect and analyze the opening rate information according to the opening and closing of the electronic expansion valves, thereby controlling the air flow control means according to the flow rate of the total refrigerant supplied to the one or more heat exchangers. A wind volume control controller configured to be configured; Blower airflow automatic control device according to the refrigerant flow rate change further comprises a blower airflow automatic control device consisting of; air flow rate control means for adjusting the wind speed or the air flow rate of the suction blower and discharge blower according to the control of the airflow control controller A direct expansion type air conditioner having a feature of the invention.

Description

Direct expansion air handling unit having apparatus for automatic controlling air volum of blower by change of refrigerant flow}

The present invention is a DX-AHU by detecting a change in the flow rate of the refrigerant in the indoor heat exchanger and outdoor period of the DX-AHU during operation of the direct expansion type air conditioner (aka DX type air conditioner-hereinafter referred to as DX-AHU) A direct expansion type air conditioner equipped with a device for automatically controlling the air volume of a blower (including both an air supply and a ventilation) of a blower. Specifically, a change in the operating state of an outdoor unit that changes according to the temperature change of a room during operation of a DX-AHU. And thereby detecting and analyzing a change in the flow rate of the refrigerant to automatically adjust the rotation amount and the air flow rate of the discharge and suction blowers.

Although all equipments that use energy are inevitable in terms of energy saving and minimization of installation place, the development of such equipment requires a lot of time and cost, so the selection of high-efficiency equipment is important, but the efficient operation of related equipment is also an important part of energy saving. .

Furthermore, in the field of air-conditioning, the management of air quality for multi-use facilities is enacted, which requires more detailed management of environmental and health issues for residential personnel. The buildings are more enclosed for energy saving, and the air conditioning environment needs to be more advanced and precise.

 Therefore, the improvement of the use environment as well as the use of high-efficiency equipment has become essential in air conditioning.

Normal air conditioner is a device that controls the temperature, humidity, air flow, and cleanliness of the air sent to the room to create a comfortable indoor environment, and mainly for large-capacity cooling and heating in large buildings such as buildings or factories. It is used.

The air conditioner heat-exchanges cold water or hot water (sometimes steam), which is a heat medium transferred from a heat source (usually a refrigerator, a boiler) and air introduced from the room (referred to as ventilation), and then is heat exchanged through a duct. This equipment sends air to lower or raise the room temperature.

At this time, the main substrate used to send and suck the heat-exchanged air is called a blower, the sending blower is called an air supply blower (aka S.F.), and the suction blower is called a ventilation blower (aka R.F.).

In general air conditioners, the heating medium uses cold water or hot water (or steam), but the direct expansion type air conditioner (DX type air conditioner-DX-AHU) is an air conditioner that uses a refrigerant as a heat medium without using a freezer or a boiler. do.

DX-AHU, which connects DX-AHU to outdoor equipment for EHP (GHP) which is the latest heat pump type, is called EHP (GHP) type air conditioner.

This EHP (GHP) type air conditioner (air conditioner: AHU) is a suitable system that connects a plurality of outdoor units to one air conditioner to configure the humidity, cleanness and airflow required for air conditioning and indoor air conditioning in a large-capacity room. It has the same functional principle as a general air conditioner.

Therefore, EHP (GHP) type air conditioner also has the advantage of managing the air quality without the installation of additional equipment.

As shown in FIG. 4, the conventional large-capacity air conditioner according to an embodiment has a configuration in which the suction part, the air mixing part, the heat exchange part, and the discharge part are sequentially arranged inside the case along the fluid (air) flow direction.

The suction part is formed on one side of the case and is connected to the room by an indoor air suction port 11 through which the ventilated indoor air (RA) is sucked, and a suction blower that sucks the indoor air into the inside of the case ( 12) is installed. The suction blower sucks the indoor air to one side and discharges the indoor air to the air mixing unit on the other side by the rotation of the centrifugal fan.

The air mixing unit is divided into a part in contact with the suction part and a part in contact with the heat exchange part on the basis of the isolation frame in which the bypass damper 21 is installed, and one side of the case upper part of the part in contact with the suction part is the indoor air introduced from the suction part. An indoor air outlet 21 through which a part is discharged is installed, and an outdoor air inlet 23 through which fresh air is introduced is formed at one side of the upper portion of the case in contact with the heat exchanger. Typically, about 30% of indoor air goes out through the indoor air outlet 21, and the remaining 70% of indoor air is mixed with 30% of outdoor air in the space part in contact with the heat exchanger through the bypass damper 21 to the heat exchanger. Will be supplied.

The heat exchanger removes contaminants of the mixed air introduced at the front of the heat exchanger and a coil-shaped heat exchanger 31 for exchanging mixed air mixed with a predetermined amount of indoor air and a predetermined amount of outdoor air introduced from the air mixing unit. It consists of an air filter (32).

The heat exchange method of the EHP (GHP) type air conditioner is connected to the coil type heat exchanger (31) by the same pipe, and the refrigerant introduced from the EHP (GHP) type outdoor unit circulates the cooling or heating cycle, and then the coil type heat exchanger (31). Cooling or heating the mixed air introduced from the) to cool or heat the room.

During the cooling, the heat exchange cycle compresses the refrigerant in the compressor 51 to form a high temperature and high pressure gas, and converts the refrigerant into a high temperature and high pressure liquid in the outdoor heat exchanger 52 (condenser), and then converts it into a low temperature and low pressure liquid in the expansion valve 53. In addition, it repeats the cycle of low-temperature low-pressure gas in the indoor heat exchanger (31, evaporator) to have a cooling cycle of heat exchange with the air in the evaporator. However, during heating, the flow of refrigerant from the compressor is changed by the four-way valve 54 installed between the compressor and the indoor and outdoor heat exchangers so that the outdoor heat exchanger operates as an evaporator and the indoor heat exchanger operates as a condenser. Such heating and cooling cycles are well known.

In addition, the opening and closing of the expansion valve 53 is a control that combines the information of the air temperature sensor 55 for measuring the air temperature in the room and the information of the refrigerant temperature sensors 56a and 56b for measuring the difference in the refrigerant temperature before and after the expansion valve. The opening amount is adjusted by the controller 57 to adjust the flow rate of the refrigerant.

In addition, as illustrated, the outdoor unit used for the heat exchange cycle is installed to have a plurality of cooling or heating cycles so as to have one outdoor unit for each indoor heat exchanger for the purpose of cooling or heating a large volume of space or in case of an emergency. .

Finally, the discharge portion is provided with an air outlet 42 for supplying heat-exchanged air in communication with the interior of the building on the case, it is composed of a discharge blower 41 for forcibly discharging the heat-exchanged air.

In the drawing, various pressure switches, various high pressure and low pressure gauges, receiver tanks, accumulators, sight glass, filter dryers, filter & dryers, The solenoid valve (Solenoid V / V), the suction filter (Suction Filter) and the like is omitted, but this configuration is a common configuration in a conventional direct expansion air conditioner system.

Referring to the operation during cooling of the large-capacity air conditioner having the above-described configuration is as follows.

First, when the suction blower 12 is driven, the air inside the building is introduced into the suction unit, and the introduced air passes through the air mixing unit while about 30% of the air is discharged to the outside through the indoor air outlet 22, On the contrary, the outdoor air inlet 23 flows toward the heat exchange part in a state in which outside air is introduced and mixed with about 70% of the in-flight air remaining.

After the impurities are filtered through the air filter 32, the air introduced into the heat exchange part is heat-exchanged at low temperature (high temperature during heating) while passing through the heat exchanger 31 installed at the rear of the air filter 32.

The cold air heat-exchanged as described above is repeatedly cooled into the building through the heat exchange air outlet 42 installed on the case by the rotational force of the discharge blower 41 installed inside the discharge unit. Will come true

In addition, the heat exchange cycle of the air conditioner and the outdoor period of the EHP (GHP) will be described based on the 60HP air conditioner.

 Hereinafter, the air conditioner main body simply refers to the entire configuration of the inlet, the air mixing unit, the heat exchanger, and the discharge unit sequentially arranged inside the case along the fluid (air) flow direction shown in the above description of the air conditioner.

If the individual outdoor unit is 20HP (56KW), the total air conditioning capacity is 60HP (168KW). That is, the number of outdoor units is plural, but the air conditioner base body corresponding to the indoor unit is composed of one, and the air conditioner base body is composed of a suction blower and a discharge blower, respectively. The refrigerant cycle is configured to adjust the capacity by connecting to the air conditioning base in each outdoor unit and allowing it to evaporate (or condense) through each electronic expansion valve (or capillary tube).

Therefore, during the initial operation, the outdoor unit is normally operated due to the room temperature connected to the air conditioning main body, and the amount of refrigerant flows as well, and when the temperature reaches the set temperature, the air temperature sensor attached to the room detects each valve to adjust the amount of refrigerant flow. Adjust each outdoor unit to operate accordingly.

However, the problem of the conventional large-capacity DX-AHU (hereinafter referred to as both EHP-type air conditioners) is a problem that it is not easy to control the air volume of the discharge blower and the suction blower according to the temperature conditions.

The reason is that in the case of individual air conditioners or system air conditioners used in homes or small offices, the horsepower of the compressor is small and the indoor electric motors used are also small. As a large air conditioner is used in large spaces as well as general air conditioners (usually called AHUs), the electric motors of the blowers used are also large and cannot be adjusted automatically according to temperature changes like small air conditioners. In the case of manual adjustment, a separate device is attached and controlled.However, manual adjustment requires constant monitoring of the indoor conditions and the operating conditions of the outdoor unit. .

For reference, the standard for determining the air volume in the air conditioner is determined in consideration of the volume of the room, the number of ventilation per hour, and the surrounding environment and conditions.In the case of DX-AHU, the refrigerant cycle (compression → condensation → expansion → evaporation) is used for general air conditioners. To achieve this smoothly, the minimum required air volume for freezing capacity per unit should be considered.

In other words, in the case of DX-AHU, the speed and amount of air contacting the heat exchanger during the phase change (liquid → gas → liquid) during the heat exchange during the heat exchange are different from the general air conditioners. It is an important component of this.

For example, when cooling in DX-AHU, the operation amount of outdoor unit is determined according to the room temperature. Because indoor temperature is high, there are many outdoor unit operations and refrigerant flows into the indoor heat exchanger. Fatal problems can occur (e.g. compressor damage due to liquid back if the amount of refrigerant cannot be adjusted due to insufficient air volume).

Therefore, in general, DX-AHU inevitably operates the blower at a constant speed to prevent this problem.

 The same applies to large-capacity EHP (or GHP) type air conditioners, so the suction blower and the discharge blower (including the motor) for supplying and venting the air are operated at a constant speed regardless of the operation amount of the outdoor unit or the flow rate of the refrigerant. Even if the operation amount of the outdoor unit or the flow rate of the refrigerant decreases according to the temperature change, the airflow is operated with more airflow than the heat dissipation (or endothermic) capacity of the heat exchanger.

In more detail, for example, the air volume setting of the air conditioner is designed and manufactured in consideration of the reference amount when the entire outdoor unit is operated.

Therefore, the air volume of the blower in the state where the airflow amount or the set temperature is reached when all three outdoor units are operated and the part of the outdoor unit is stopped is the same.

If the outdoor unit operation volume is stopped after a certain period of time, there is no particular problem in the case of cooling.However, in the case of heating, if the set temperature is reached and only two outdoor units are operated, only 40HP of heat is generated, but the air flow is 60HP. Therefore, compared to the amount of heat released initially, 1/3 is reduced, and thus the temperature discharged is lowered. Therefore, when the discharged air reaches the human body in this state, it may feel relatively cold and, in severe cases, may feel cold.

As described above, the problems occurring during constant speed operation of the blower of the conventional high-capacity EHP (GHP) type air conditioner are as follows. The following description uses heating as an example.

When the EHP (GHP) type air conditioner is operated, it operates at the maximum operating condition up to the set temperature, and when the set temperature is reached after a predetermined time, the operation amount of the outdoor units is adjusted to reduce the temperature. Accordingly, as the utilization rate of all or some outdoor units is reduced, heat exchange in the heat exchanger is reduced, and thus heat supply to the indoor heat exchanger is also reduced. However, since the air volume of the blower is still operated at a constant speed and the same air flow rate is supplied, the haptic temperature supplied to the room is lower. If this phenomenon persists, the outdoor unit operation rate is increased again to increase the indoor temperature, and unnecessary energy is consumed.

An object of the present invention for solving the above problems is to stabilize the room temperature by automatically adjusting the air flow rate of the discharge and suction blower constituting the EHP (GHP) type air conditioner according to the flow rate of the refrigerant supplied to the heat exchanger in both heating and cooling Automatically detects when the outdoor unit's operation amount decreases or the flow rate of the refrigerant decreases and adjusts the output of the motor to adjust the air flow rate to adjust the air intake rate and reduce the power cost by changing the rotation amount of the blower or the air intake and discharge air flow. In the city to provide a direct expansion type air conditioner with an air blower automatic control device according to the amount of refrigerant flow changes to maintain a comfortable temperature condition by adjusting the air volume according to the amount of heat generated.

The present invention to achieve the object as described above and to perform the problem for eliminating the conventional defects in the direct expansion type large capacity EHP (GHP) type air conditioner,
To adjust the flow rate of the refrigerant supplied to the heat exchanger of the air conditioner, the information of the air temperature sensor for measuring the air temperature in the room and the information of the refrigerant temperature sensor attached to the inlet and outlet pipes of the electronic expansion valve respectively to measure the refrigerant temperature difference A control controller which collects and controls the opening amount by opening and closing the electronic expansion valve;
It is connected to at least one control controller connected to the electronic expansion valve installed in each heat exchanger, and calculates the initial opening amount of the electronic expansion valve and the changed opening amount of the entire electronic expansion valve when the opening amount changes due to opening and closing of the electronic expansion valve. A flow rate control controller configured to control the flow rate adjusting means according to the flow rate of the total refrigerant supplied to the at least one heat exchanger to adjust the flow rate;
According to the control of the air volume control controller to control the air volume by adjusting the wind speed of the suction blower and the discharge blower, the drive motor for driving the suction blower and discharge blower, and controlling the rotation frequency of the circuit connected drive motor to control the wind speed It is achieved by providing a direct expansion type air conditioner having an automatic blower air flow control device according to the refrigerant flow rate change, characterized in that it comprises a blower air flow rate automatic control device consisting of;

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As described above, the present invention automatically adjusts the air volume of the discharge and suction blower constituting the air conditioner according to the flow rate of the refrigerant supplied to the heat exchanger, and supplies the air volume discharged to the air conditioner and the air discharged into the air conditioner after the temperature is stabilized with the proper air volume. By creating a pleasant air conditioning environment,

In addition, the air volume of the discharge and suction blower is automatically adjusted according to the flow rate of the refrigerant, which prevents unnecessary waste of the outdoor unit and power of the motor driving the blower, thereby preventing energy waste.

In addition, by lowering the maximum operating speed of the discharge and intake blowers generated when the outdoor unit is not the maximum operating condition according to the outdoor unit operating conditions, it reduces the noise introduced through the duct to provide a comfortable indoor environment,

Since the adjustment according to the condition of the air conditioner system than the existing arbitrary airflow control method (inverter) is a useful invention that has the advantage that it can secure more appropriate capacity than the artificial adjustment is an invention that is expected to use the industrial greatly.

1 is a schematic view of an air conditioner showing the air volume control of a blower by an inverter according to an embodiment of the present invention,
Figure 2 is a schematic diagram of the air conditioner showing the air volume control of the blower by the vane damper according to another embodiment of the present invention,
3 is a flow chart showing a method for adjusting the air volume of the blower by the inverter according to an embodiment of the present invention,
Figure 4 is a schematic diagram of a conventional large-capacity air conditioner according to one embodiment.

Hereinafter, the configuration and the operation of the embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Figure 1 is a schematic diagram of an air conditioner showing the air flow control of the blower by the inverter according to an embodiment of the present invention. The basic configuration of the air conditioner of the present invention according to the illustrated embodiment is an air conditioner having multiple air-conditioning cycles having a plurality of outdoor units, as in the configuration of the conventional air conditioner for EHP (or GHP) described above. Hereinafter, the configuration will be described differently from the prior art.

The configuration of the present invention is a direct expansion type large capacity EHP (GHP) type air conditioner,
A control controller 57 for controlling an electronic expansion valve whose opening amount is adjusted by opening and closing so as to adjust the flow rate of the refrigerant supplied to the heat exchanger of the air conditioner;
The circuit is connected to one or more control controllers 57 connected to the electronic expansion valve 53 installed for each heat exchanger to collect and analyze the opening degree information according to the opening and closing of the electronic expansion valve to collect and analyze the total refrigerant supplied to the one or more heat exchangers. A flow rate control controller 1 configured to control the flow rate adjusting means in accordance with the flow rate;
Drive motors 121 and 141 driving the suction blower and the discharge blower to adjust the air flow rate by controlling the wind speed of the suction blower 12 and the discharge blower 14 according to the control of the air flow control controller 1; It is configured to include a blower air volume automatic control device consisting of; air flow rate control means consisting of inverters (2a, 2b) for controlling the wind speed by controlling the rotation frequency of the drive motor connected to the circuit.

As shown, the present invention includes a control controller 57 for controlling the indoor electronic expansion valve 53 (EEV) for opening and closing the flow of the refrigerant supplied to the heat exchanger of the large-capacity air conditioner. Therefore, the opening and closing of the electronic expansion valve 53 in the room collects the information of the air temperature sensor 55 for measuring the air temperature of the room and the information of the refrigerant temperature sensors 56a, 56b for measuring the refrigerant temperature difference between the front and rear ends of the expansion valve. The opening amount is controlled by one control controller 57 to control the flow rate of the refrigerant.

According to the present invention, the amount of air is controlled by controlling the suction blower 12 and the discharge blower 41 which rotate at a constant speed regardless of the operation amount of the outdoor unit or the flow rate of the refrigerant with the information of the control controller 57. will be.

To this end, the air volume control controller 1 is connected to the control controller 57 by a circuit. The information that can be obtained by the air volume control controller 1 by such a circuit connection is the flow rate change information of the refrigerant according to the opening degree of the electronic expansion valve 53 (EEV).

The flow rate change information of the refrigerant analyzes the information of the air temperature sensor 55 measuring the indoor air temperature and the information of the refrigerant temperature sensors 56a and 56b measuring the temperature of the refrigerant before and after the electronic expansion valve to calculate the appropriate opening and closing rate. This is possible because of the control controller 57.

In detail, the control controller 57 detects the indoor temperature from the air temperature sensor 55 measuring the indoor air temperature and compares the set temperature with the detected temperature detected by the air temperature sensor. It sends a signal to proportionally open and close the electronic expansion valve (53, EEV) in the room that controls the flow to adjust or stop the outdoor unit operation amount. In addition, the refrigerant temperature sensors 56a and 56b attached to the inlet and outlet pipes of the electronic expansion valves 53 and EEVs in the room close the electronic expansion valves 53 and EEVs in the room so that the refrigerant flow is blocked. Adjust your driving. That is, since the electronic expansion valve 53 (EEV) in the room is controlled proportionally by the temperature sensor and the refrigerant flow amount is adjusted, the operation amount of the outdoor unit can be changed, so the opening amount of the electronic expansion valve 53 (EEV) in the room is detected and analyzed. After that, in consideration of the delay time affecting the operation of the outdoor unit, the air volume control controller 1 adjusts the air volume. The air volume control controller 1 is a processor in which a program for performing such processing is incorporated.

Therefore, when the flow rate of the refrigerant is changed by the opening degree according to the opening / closing of the electronic expansion valve 53 (EEV) in the room through the control controller 57, the air volume control controller 1 moves the inverters 2a and 2b which are the air volume control means. By controlling, the rotation frequency is automatically adjusted according to the refrigerant flow rate change. That is, the frequency (Hz) when the flow rate of the refrigerant supplied from the outdoor unit according to the maximum operating condition of the air conditioner is 100% as the reference frequency is set as the reference frequency, and when less refrigerant flows, it is changed to the frequency lower than the reference frequency (Hz) to rotate the amount of rotation. To change.

Reference frequency is not specified here depending on the capacity of the air conditioner. However, if the amount of reduction is explained as a percentage, 40% of the maximum operating conditions become the control target and the speed is adjusted continuously. Setting the lower limit speed value only to 60% is because the cooling cycle configuration may be broken if the blower airflow amount is too low. That is, in order to prevent cracking of the refrigeration cycle when changing the unreasonable blowing amount.

The inverters 2a and 2b as the air volume adjusting means change the rotation speed of the driving motors 121 and 141 of the suction blower 12 and the discharge blower 41 connected according to the frequency controlled by the control controller 57 by the changed frequency. Rotated.

As a result, when the rotation speeds of the driving motors 121 and 141 of the suction blower 12 and the discharge blower 41 decrease, the wind speed decreases. As a result, the air volume of the suction blower 12 and the discharge blower 41 is reduced. . Therefore, the reduction in the rotational speed of the drive motors 121 and 141 reduces the electric current drawn into the motor, thereby reducing the power consumption, thereby increasing energy efficiency according to the operation of the air conditioner. As in the prior art, the haptic temperature is prevented from being lowered.

Also, in the illustrated control panel, only the control controller 57 is connected to the electronic expansion valve of the individual outdoor unit in order to omit unnecessary redundant description, but it is well known that the circuit is connected to control each device constituting the air conditioner. In the following, controlling each device is performed by the control controller 57.

The airflow control controller 1 collects and analyzes information on one or more control controllers connected to an electronic expansion valve (EEV) of each room installed for each heat exchanger, and adjusts the airflow control means according to the flow rate of the total refrigerant supplied to each heat exchanger. To control.

Figure 2 is a schematic diagram of the air conditioner showing the air volume control of the blower by the vane damper according to another embodiment of the present invention, the basic configuration is the same as Figure 1, except that the air flow rate adjusting means of the suction blower and discharge blower Only the vane dampers 3a and 3b driven by the motors 301a and 301b, which are installed at the air inlet end and directly adjust the air flow rate, reduce the power consumption of the motors installed in the suction blower and the discharge blower. A vane damper is simply an opening and closing device by a rotary blade. In order to control the opening and closing of the vane damper according to the refrigerant flow rate change, the present invention connects the motor and the angle control controllers 2c and 2d so that the motors 301a and 301b for driving the vane damper are adjusted according to the refrigerant amount change. The rotation angle of was adjusted. Here, the motor refers to a motor whose rotation angle is controlled and whose rotation angle is controlled by a slip motor or a reducer.

Since the angle adjusting controllers 2c and 2d are connected to the air volume control controller 1 as shown in the drawing, the rotation angle of the motor is adjusted according to the control of the air volume control controller 1 according to the flow rate of the refrigerant.

3 is a flowchart illustrating a method for controlling air volume of a blower by an inverter according to an embodiment of the present invention. The control flow for adjusting the air volume of the blower according to the present invention will be described based on the cooling time. (The operating flow during heating is also the same.)

A) Air conditioner operation stage (S100)

: After the power is supplied, start the blower operation by starting the suction blower and discharge blower, and operate with the opening ratio of the electronic expansion valve at 100% through the control controller.

B) temperature setting step (S200)

: Step of setting room temperature by operating temperature setting part of control panel.

C) Indoor air temperature difference determination step (S300)

: It is a step in which the control controller detects the difference between the detected temperature and the set temperature by detecting the indoor temperature through the air temperature sensor installed in the room.

D) outdoor unit operation step (S400)

: If the indoor air temperature measured by the air temperature sensor does not reach the set temperature, the control controller starts the outdoor unit.

E) Refrigerant temperature difference determination step (S500)

: The control controller detects whether the temperature of the refrigerant has reached the set temperature through the refrigerant temperature sensor attached to the inlet and outlet pipe of the electronic expansion valve.

F) electronic expansion valve opening rate adjustment step (S600)

: When the temperature measured from the refrigerant temperature sensor reaches the set temperature, the controller controls the opening ratio of the electronic expansion valve to be small and the operation amount of the outdoor unit.

G) Electronic expansion valve opening rate adjustment detection step (S700)

The air volume control controller detects and analyzes the opening amount of one or more electronic expansion valves through the control controller.

H) Blower air volume control range calculation step (S800)

: The air volume control controller determines the air volume control range of the blower by calculating the initial opening amount of the electronic expansion valve and the opening amount of the entire electronic expansion valve when the opening amount of the electronic expansion valve is changed through the control controller.

At this time, the duration at the time of setting the air volume control of the blower can be arbitrarily adjusted according to the capacity to 5 minutes to 10 minutes.

I) Airflow control step (S900)

The air volume control controller controls the air volume of the suction blower and discharge blower using an inverter or a fan inlet vane damper.

Here, the inverter is a speed change by controlling the rotation speed of the blower motor according to the inverter Hz change, that is, the rotation frequency of the motor installed in the suction blower and the discharge blower after calculating the ratio according to the opening ratio calculation of the electronic expansion valve. It is equipped with a method of adjusting the air volume by the wind speed control.

In addition, vane damper (FAN inlet vane damper) method is installed at the air inlet end of the suction blower and discharge blower to reduce the power consumption of the motor installed in the suction blower and discharge blower by directly controlling the air volume.

J) When the indoor load rises after performing the above step, the process is reversed.

In addition, the precautions when setting the control is configured to automatically adjust the air volume adjustment range of the blower up to about 40%, that is, 60% based on 100% as the low-point air volume. Within 40%, it is controlled steplessly.

In addition, when the air conditioner stops operating, all data are returned to the initial setting values.

In addition, the duration must be set to prevent frequent changes in the blower air volume. Preferred durations are adjusted by dose to a minimum of 5 to 10 minutes. At this time, the mechanical blower will not be overwhelmed by the large blower. That is, less than 5 minutes is too changeable to balance the refrigeration cycle and up to 10 minutes is sufficient, a time greater than this means no further control.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

<Explanation of symbols for the main parts of the drawings>
(1): Air volume control controller (2a, 2b): Inverter
(2c, 2d): angle control controller (3a, 3b): vane damper
12: suction blower 41: discharge blower
(57): control controller (121, 411): drive motor

Claims (3)

In the direct expansion type large capacity EHP (GHP) type air conditioner,
To adjust the flow rate of the refrigerant supplied to the heat exchanger of the air conditioner, the information of the air temperature sensor for measuring the air temperature in the room and the information of the refrigerant temperature sensor attached to the inlet and outlet pipes of the electronic expansion valve respectively to measure the refrigerant temperature difference A control controller which collects and controls the opening amount by opening and closing the electronic expansion valve;
It is connected to at least one control controller connected to the electronic expansion valve installed in each heat exchanger, and calculates the initial opening amount of the electronic expansion valve and the changed opening amount of the entire electronic expansion valve when the opening amount changes due to opening and closing of the electronic expansion valve. A flow rate control controller configured to control the flow rate adjusting means according to the flow rate of the total refrigerant supplied to the at least one heat exchanger to adjust the flow rate;
According to the control of the air volume control controller to control the air volume by adjusting the wind speed of the suction blower and the discharge blower, the drive motor for driving the suction blower and discharge blower, and controlling the rotation frequency of the circuit connected drive motor to control the wind speed Direct expansion type air conditioner with a blower airflow automatic control device according to the refrigerant flow rate change, characterized in that it comprises a blower airflow automatic control device consisting of an inverter;

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