KR20060031149A - Method for control temperature of ceilling type air-conditioner - Google Patents

Abstract

The present invention relates to a temperature control method of a ceiling type air conditioner and to uniformly control the air temperature discharged to both sides through two symmetric indoor heat exchangers.

To this end, the present invention, in the control method of the ceiling-type air conditioner for discharging the air heat exchanged through at least one indoor heat exchanger through at least one discharge port, the pipe temperature difference is calculated by sensing the at least one indoor heat exchanger temperature And comparing the calculated pipe temperature difference with a predetermined reference pipe temperature, when the pipe temperature difference is out of the standard pipe temperature range, independently controlling the rotation speed of the plurality of indoor fans to control the air temperature discharged through at least one discharge port. The user can be uniformly controlled so as not to feel uncomfortable.

Description

Method for control temperature of ceilling type air-conditioner

1 is a structural diagram showing an indoor unit of a ceiling type air conditioner according to the present invention;

2 is a cross-sectional view showing a ceiling air conditioner of FIG.

3 is a refrigerant cycle diagram of a ceiling type air conditioner according to the present invention;

4 is a configuration diagram of a temperature control device of a ceiling type air conditioner according to an embodiment of the present invention;

5 is an operation flowchart of a temperature control method of a ceiling type air conditioner according to the present invention;

Explanation of symbols on the main parts of the drawings

10: indoor unit 16: intake port

18a, 18b: outlet 22a, 22b: indoor heat exchanger

24a, 24b: Indoor fan 26a, 26b: Piping sensor

28a, 28b: indoor fan motor 50: outdoor unit

120: first pipe temperature detection unit 130: second pipe temperature detection unit

140: rotation speed detection unit 150: control unit

180: first indoor fan motor driving unit 190: second indoor fan motor driving unit

The present invention relates to a ceiling air conditioner having two symmetric indoor heat exchangers, and more particularly, to a temperature control method of a ceiling air conditioner that uniformly controls the air temperature discharged to both sides through two indoor heat exchangers.

In general, the ceiling-type air conditioner has an advantage of increasing the utilization of the indoor space because it is installed in the ceiling, unlike the wall-mounted or packaged air conditioner.

As a kind of such a ceiling type air conditioner, Japanese Patent Laid-Open No. 2001-012790 has a structure having two symmetric indoor heat exchangers.

The ceiling type air conditioner disclosed in this publication is suitable for a place having a long rectangular shape such as a conference room, and has two discharge ports formed on both outer sides of the intake air through the two indoor heat exchangers through which the air sucked in through the intake port formed at the center of the ceiling panel. Cooling or heating the room while being discharged through.

By the way, in such a conventional ceiling type air conditioner, even if the refrigerant is uniformly distributed to the two indoor heat exchangers, the air temperature to be discharged from both sides is different depending on the air temperature to be sucked or the contamination state of the indoor heat exchanger, and also the distribution of the refrigerant Due to the difference, the discharge air temperature on both sides may be different, which may cause discomfort to the user, and a user complaint may be raised that only one side is cooled (or heated).

 Accordingly, the present invention is to solve the conventional problems as described above, an object of the present invention is to provide a temperature control method of a ceiling type air conditioner to uniformly control the air temperature discharged to both sides through two indoor heat exchanger. have.

In order to achieve the above object, a temperature control method of a ceiling type air conditioner according to the present invention is a control method of a ceiling type air conditioner for discharging air exchanged through at least one indoor heat exchanger through at least one discharge port. Detects at least one indoor heat exchanger temperature to calculate a pipe temperature difference, and compares the calculated pipe temperature difference with a predetermined reference pipe temperature, and when the pipe temperature difference is out of the reference pipe temperature range, the air discharged through the at least one discharge port. It is characterized by controlling the temperature.

In addition, the present invention includes a plurality of indoor fans installed in the at least one indoor heat exchanger, and if the pipe temperature difference is out of the standard pipe temperature range, the plurality of indoor fan rotation speed is controlled to uniformly regulate the discharge air temperature ; The plurality of indoor fan rotation speed is independently controlled according to the air temperature discharged through the at least one discharge port.

In addition, the present invention is to control the high discharge air temperature by increasing the indoor fan rotation speed of the lower side of the indoor heat exchanger during the cooling operation; During the heating operation, the indoor air exchanger temperature is increased to increase the indoor fan rotation speed, characterized in that to control the discharge air temperature low.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a structural diagram showing an indoor unit of a ceiling type air conditioner according to the present invention, and FIG. 2 is a cross-sectional view of the ceiling type air conditioner of FIG. 1.

1 and 2, the indoor unit 10 is installed in a state where the indoor unit 10 is embedded in a ceiling, and the cabinet 12 of the cabinet 12 having its lower surface opened and the lower surface opening of the cabinet 12 is covered with the cabinet 12. It is provided with a ceiling panel 14 installed at the bottom.

In the center of the ceiling panel 14, the inlet 16 is formed to suck the indoor air, and on both outer sides of the inlet 16, the inlet air is heat-exchanged so that the first and second outlets ( 18a and 18b are formed, and the first and second discharge ports 18a and 18b are provided with wind direction control vanes 20a and 20b for controlling the direction of the discharged air.

Inside the cabinet 12, the first and second indoor heat exchangers 22a and 22b for exchanging the sucked air to cold or warm air by the latent heat of evaporation of the refrigerant are symmetrically arranged on the rear side of the inlet 16. And a rear side of the first and second indoor heat exchangers 22a and 22b that suck air through the inlet 16 and discharge heat-exchanged air through the first and second outlets 18a and 18b. Two first and second cross flow indoor fans 24a and 24b are installed, and the temperature of the indoor heat exchangers 22a and 22b is respectively set in the first and second indoor heat exchangers 22a and 22b. First and second pipe sensors 26a and 26b for sensing are installed.

3 is a refrigerant cycle diagram of a ceiling type air conditioner according to the present invention.

In FIG. 3, the ceiling type air conditioner of the present invention includes an outdoor unit 50 forming a normal refrigerant cycle, and an indoor unit 10 connected to the outdoor unit 50 to perform indoor cooling and heating, and the indoor unit 10 and the outdoor unit A refrigerant pipe is installed between the 50 parts.

The outdoor unit 50 includes a compressor 52 for compressing a refrigerant, a four-way valve 54 for adjusting a flow direction of the refrigerant discharged from the compressor 52, and a gas of high temperature and high pressure compressed by the compressor 52. An outdoor heat exchanger 56 that receives refrigerant and exchanges heat with the outdoor air, an outdoor fan 58a for forcibly blowing outdoor air to perform heat exchange in the outdoor heat exchanger 56, and rotates the outdoor fan 58a. Outdoor fan motor 58 and expansion valve 60 (or capillary tube) for expanding the refrigerant heat exchanged in the outdoor heat exchanger (56).

The indoor unit 10 omits the overlapping description with the structure described with reference to FIGS. 1 and 2, and the first and second indoor fans 24a and 24b respectively include the first and the second fans that rotate the indoor fans 24a and 24b. Second indoor fan motors 28a and 28b are installed.

When the ceiling type air conditioner having the refrigerant cycle configured as described above is used for both heating and cooling, the four-way valve 54 is turned on during heating so that the refrigerant is shown in the dotted arrow direction in FIG. 3. (54) → First and second indoor heat exchangers (22a, 22b) → expansion valve (60) → outdoor heat exchanger (56) → four-way valve (54) → form a refrigerant cycle circulated in the order of the compressor (52). .

On the other hand, during cooling, the four-way valve 54 is turned off so that the refrigerant is shown in the solid arrow direction of FIG. 3, and the compressor 52 → four-way valve 54 → outdoor heat exchanger 56 → expansion valve 60. A refrigerant cycle circulated in the order of the first and second indoor heat exchangers 22a and 22b, the four-way valve 54, and the compressor 52;

In the ceiling type air conditioner for both cooling and heating, which forms the refrigerant cycle as described above, the user inputs the desired operation mode (cooling or heating), the set temperature, and the set air volume, and then turns on the operation keys. , 24b) is sucked into the indoor unit 10 through the suction port 16 while rotating according to the set air volume.

By comparing the temperature of the indoor air sucked through the suction port 16 and the set temperature, the operation frequency of the compressor 52 is controlled by driving the compressor 52 according to the difference between the room temperature and the set temperature, thereby performing a cooling and heating function.

4 is a configuration diagram of a temperature control device of a ceiling type air conditioner according to an embodiment of the present invention, which includes a signal input unit 100, an indoor temperature detection unit 110, a first piping temperature detection unit 120, and a second Piping temperature sensing unit 130, rotation speed sensing unit 140, control unit 150, compressor driving unit 160, outdoor fan motor driving unit 170, the first indoor fan motor driving unit 180, the second indoor fan motor driving unit 190 and the four-way valve driving unit 200 is configured.

The signal input unit 100 includes an operation unit for inputting operation mode (such as cooling or heating operation) selected by a user, and operation information such as a set temperature, a set air volume, and a set wind direction, and the indoor temperature sensor 110. Detects the temperature of the indoor air sucked into the indoor unit 10 through the inlet (16).

The first pipe temperature detector 120 measures the pipe temperature of the first indoor heat exchanger 22a so as to sense the air temperature that is heat exchanged by the first indoor heat exchanger 22a and discharged through the first discharge port 18a. And a first pipe sensor 26a to be measured, and the second pipe temperature sensor 130 is heat-exchanged by the second indoor heat exchanger 22b and discharged through the second discharge port 18b. It consists of a second pipe sensor (26b) for measuring the pipe temperature of the second indoor heat exchanger (22b) to detect the.

The rotation speed detection unit 140 detects the rotation speed (RPM) of the first and second indoor fan motors 28a and 28b driven according to the set air volume or the indoor fan control signal of the controller 150.

The controller 150 calculates a pipe temperature difference according to pipe temperatures of the first and second indoor heat exchangers 22a and 22b and compares the pipe temperature with a preset reference pipe temperature, and according to the comparison result, the first and second indoor fans. By independently PID control the rotation speed (RPM) of the motors 28a and 28b, the indoor unit 10 microcomputer, the outdoor unit 50 microcomputer, etc. are included.

The PID control is a control method that uses a combination of three operations of P (proportional), I (integral), and D (derivative) in feedback control, and is a technique commonly used in process control.

In addition, the controller 150 may be configured according to the number of revolutions (RPM) of the first and second indoor fan motors 28a and 28b and the pipe temperatures of the first and second indoor heat exchangers 22a and 22b. The discharge air temperatures at the two discharge ports 18a and 18b are calculated to change the target RPMs of the first and second indoor fan motors 28a and 28b.

The compressor driver 160 controls the driving of the compressor 52 according to the compressor control signal of the controller 150, and the outdoor fan motor driver 170 controls the outdoor fan motor according to the outdoor fan control signal of the controller 150. The drive of 58 is controlled.

The first indoor fan motor driver 180 controls the RPM RPM of the first indoor fan motor 28a according to the indoor fan control signal of the controller 150, and the second indoor fan motor driver 190 ) PID control the rotation speed (RPM) of the second indoor fan motor (28b) according to the indoor fan control signal of the controller 150.

The four-way valve driver 200 according to the valve control signal of the controller 150 to switch the refrigerant cycle to cooling or heating in accordance with the operation mode (cooling or heating) input from the signal input unit 100. Control on / off.

Hereinafter, an operation process and an effect of the temperature control method of the ceiling type air conditioner configured as described above will be described.

5 is an operation flowchart of a temperature control method of a ceiling type air conditioner according to the present invention, in which S denotes a step (STEP).

The temperature control method of the ceiling type air conditioner according to the present invention includes a coefficient setting step (S100 to S111) for setting a temperature coefficient according to an operation mode; A pipe temperature sensing step (S120 to S160) of detecting pipe temperatures of the first and second indoor heat exchangers 22a and 22b during the cooling or heating operation; A pipe temperature comparison step (S170 to S180) of calculating a pipe temperature difference according to the pipe temperatures of the detected first and second indoor heat exchangers 22a and 22b and comparing it with a preset reference pipe temperature; In accordance with the comparison result, the number of revolutions (RPM) of the first and second indoor fan motors 28a and 28b are independently PID controlled to uniformly control the air temperature discharged from the first and second discharge ports 18a and 18b. It includes a discharge temperature control step (S190 ~ S200).

Referring to the operation of the temperature control method of the ceiling type air conditioner configured as described above in more detail, operation information such as the operation mode (cooling or heating) and the set temperature, the set air volume selected by the user is controlled by the signal input unit 100. Is input to 150.

The controller 150 controls the four-way valve driver 200 to be switched to a cooling or heating cycle by controlling the four-way valve driver 200 according to the selected operating condition, and controls the compressor driver 160 to drive the compressor 52. Let's do it.

Therefore, the controller 150 determines the operating condition (S100), sets the temperature coefficient N to 1 for cooling operation (S110), and sets the temperature coefficient N to −1 for heating operation (S111). .

The temperature coefficient N increases the rotation speed of the indoor fan motors 28a and 28b at the lower temperature of the pipe sensors 26a and 26b in the case of cooling, and at the higher temperature of the pipe sensors 26a and 26b in the case of heating. It is a temperature setting coefficient for adjusting the indoor fan motors 28a and 28b so as to increase the rotation speed so that the temperature values of the pipe sensors 26a and 26b of both pipes are the same regardless of cooling or heating.

The control unit 150 drives the first and second indoor fan motors 28a and 28b according to the set air volume input from the signal input unit 100 so that the two indoor fans 24a and 24b rotate. At the time, the indoor fan motors 28a and 28b are driven after the cold wind prevention control (S120).

In the cooling or heating operation, it is determined whether the compressor 52 is in operation. If the compressor 52 is not in operation, it is determined whether the compressor 52 is in an on condition. If the compressor is in an on condition, the compressor 52 is driven with a predetermined delay time. Let (S130 ~ S150).

Thereafter, the pipe temperatures E1 and E2 of the first and second indoor heat exchangers 22a and 22b that change according to the operation of the compressor 52 are sensed by the first and second pipe temperature sensing units 120 and 130. The controller 150 outputs the data to the controller 150 (S160).

Therefore, the controller 150 calculates the pipe temperature difference E1-E2 according to the first and second pipe temperatures E1 and E2 input from the first and second pipe temperature sensing units 120 and 130, and is set in advance. Compare whether or not the reference pipe temperature (Es; the lowest pipe temperature difference, about 2 ° C.), at which the discharge air temperatures at both sides are different (S170).

As a result of the comparison, if the pipe temperature difference E1-E2 is equal to or higher than the reference pipe temperature Es (YES), the air temperature discharged through the first and second discharge ports 18a and 18b starts to vary, and thus the controller ( 150 determines whether the value is greater than zero by multiplying the calculated pipe temperature difference E1-E2 by the temperature coefficient N (S180).

This increases the rotation speed of the indoor fan motors 28a and 28b at the lower temperature of the pipe sensors 26a and 26b in the case of cooling, and the indoor fan motor 28a at the temperature of the pipe sensors 26a and 26b in the case of heating. , 28b) to increase the number of revolutions.

If the value obtained by multiplying the pipe temperature difference E1-E2 by the temperature coefficient N is not greater than 0 (NO), the temperature of the first indoor heat exchanger 22a is low (at cooling) or high (at heating). Therefore, in order to increase (at cooling) or lower (at heating) the air temperature discharged through the first discharge port 18a, the controller 150 controls the rotation speed RPM of the first indoor fan motor 28a to be high. As a result, the discharge air temperature of the first discharge port 18a is controlled to be increased (during cooling) or lowered (during heating) (S190).

As a result of the determination in step S180, when the value obtained by multiplying the pipe temperature difference E1-E2 by the temperature coefficient N is greater than zero (YES), the temperature of the second indoor heat exchanger 22b is low (at cooling time). Alternatively, since it is in a high state (when heating), the control unit 150 rotates the second indoor fan motor 28b to increase (at cooling) or lower (at heating) the air temperature discharged through the second discharge port 18b. The number RPM is controlled to be high so that the discharge air temperature of the second discharge port 18b can be increased (at cooling) or lower (at heating) (S200).

In this way, the air discharged from both sides can be uniformly controlled through the first and second discharge ports 18a and 18b during the cooling or heating operation of the ceiling type air conditioner.

Therefore, even if the refrigerant is uniformly distributed to the two indoor heat exchangers 22a and 22b, the refrigerant is uniformly irrespective of the difference in air temperature to be sucked or the difference due to welding error, the contamination state of the indoor heat exchangers 22a and 22b, and the like. Even if it is not distributed, it is possible to uniformly control the air temperature discharged from either side.

Meanwhile, in one embodiment of the present invention, the rotation speed (RPM) of the first and second indoor fan motors 28a and 28b according to the pipe temperature difference E1 to E2 of the first and second indoor heat exchangers 22a and 22b. ), But the present invention is not limited thereto, and the rotation speeds of the first and second indoor fan motors 28a and 28b and the first and second indoor heat exchangers 22a and 22b are described. By changing the target RPM of the first and second indoor fan motors (28a, 28b) in accordance with the piping temperature of) can be achieved the same object and effect as the present invention.

What has been described above is only one embodiment for carrying out the temperature control method of the ceiling type air conditioner according to the present invention, the present invention is not limited to the above-described embodiment, it is within the technical spirit of the present invention Various modifications are possible by those skilled in the art.

As described above, according to the temperature control method of the ceiling type air conditioner according to the present invention, the air temperature discharged from both sides by PID control independently the number of revolutions of the two indoor fans according to the pipe temperature difference of the two indoor heat exchanger Since the user is uniformly controlled so that the user does not feel uncomfortable, there is no need for a separate flow control valve.

Claims (5)

In the control method of the ceiling air conditioner for discharging the air heat exchanged through at least one indoor heat exchanger through at least one discharge port, Calculating a pipe temperature difference by detecting the at least one indoor heat exchanger temperature; Comparing the calculated pipe temperature difference with a predetermined reference pipe temperature and controlling the air temperature discharged through the at least one discharge port when the pipe temperature difference is out of the reference pipe temperature range. . The method of claim 1, A plurality of indoor fans installed in the at least one indoor heat exchanger, And controlling the plurality of indoor fan rotation speeds to uniformly adjust the discharge air temperature when the pipe temperature difference is out of the reference pipe temperature range. The method of claim 2, The plurality of indoor fan rotation speed is independently controlled according to the temperature of the air discharged through the at least one discharge port. The method according to any one of claims 1 to 3, In the cooling operation, the temperature control method of the ceiling type air conditioner characterized in that to control the discharge air temperature by increasing the indoor fan rotation speed of the lower side of the indoor heat exchanger temperature. The method according to any one of claims 1 to 3, The temperature control method of the ceiling type air conditioner, characterized in that during the heating operation to control the discharge air temperature is lowered by increasing the number of rotation of the indoor fan of the higher temperature of the indoor heat exchanger.

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