JP-2026075375-A - Air conditioning system and control method

Abstract

[Problem] To provide an air conditioning system that can dehumidify a room while preventing excessive drops in room temperature and condensation at the air outlet of the indoor unit. [Solution] During dehumidification operation, the control device 51 controls the rotation speed of the indoor fan 32 based on the temperature of the decorative panel 35 detected by the first detector 41 and the dew point temperature of the decorative panel 35. [Selection Diagram] Figure 5

Inventors

• 八木 香太郎
• 仲島 孔明
• 松田 拓也

Assignees

• 三菱電機株式会社

Dates

Publication Date

20260508

Application Date

20241022

Claims (9)

1. An air conditioning system, Outdoor unit and Indoor unit and Equipped with a control device, The aforementioned indoor unit is An indoor heat exchanger that performs heat exchange between indoor air and a refrigerant, A fan that blows air from the room to the indoor heat exchanger, A decorative panel having an outlet formed therein for the air that has undergone heat exchange in the indoor heat exchanger to be blown out into the room, It includes a first detector for detecting the temperature of the decorative panel, The control device controls the rotation speed of the fan during dehumidification operation based on the temperature of the decorative panel detected by the first detector and the dew point temperature of the decorative panel.
2. The indoor unit further includes a second detector for detecting the temperature of the indoor heat exchanger. The air conditioning apparatus according to claim 1, wherein the control device further controls the rotation speed of the fan based on the temperature of the indoor heat exchanger detected by the second detector during the dehumidification operation.
3. The aforementioned indoor unit is A third detector for detecting the temperature of the room, The system further includes a fourth detector for detecting the humidity in the room, The air conditioning device according to claim 2, wherein the control device calculates the dew point temperature based on the room temperature detected by the third detector and the room humidity detected by the fourth detector.
4. The air conditioning system according to claim 2 or 3, wherein the control device increases the rotation speed of the fan when the temperature of the decorative panel detected by the first detector is below the dew point temperature, and the temperature of the indoor heat exchanger detected by the second detector is below the dew point temperature.
5. The air conditioning system according to claim 2 or 3, wherein the control device maintains the fan speed when the temperature of the decorative panel detected by the first detector is below the dew point temperature, and the temperature of the indoor heat exchanger detected by the second detector is higher than the dew point temperature.
6. The control device is Set a target dew point temperature lower than the aforementioned dew point temperature. The air conditioning device according to claim 2 or 3, wherein if the temperature of the decorative panel detected by the first detector is higher than the dew point temperature, and the temperature of the indoor heat exchanger detected by the second detector is higher than the target dew point temperature, the rotation speed of the fan is reduced.
7. The control device is A target dew point temperature lower than the aforementioned dew point temperature and a freeze prevention temperature that prevents the freezing of moisture in the air are set. The air conditioning device according to claim 2 or 3, wherein the fan speed is maintained when the temperature of the decorative panel detected by the first detector is higher than the dew point temperature, and the temperature of the indoor heat exchanger detected by the second detector is between the freeze prevention temperature and the target dew point temperature.
8. The indoor unit further comprises a heating section, The air conditioning device according to claim 1, wherein the control device operates the heating unit when the temperature of the decorative panel detected by the first detector is below the dew point temperature.
9. A control method for controlling an air conditioning system comprising an outdoor unit and an indoor unit using a computer, The aforementioned indoor unit is An indoor heat exchanger that performs heat exchange between indoor air and a refrigerant, A fan that blows air from the room to the indoor heat exchanger, A decorative panel having an outlet formed therein for the air that has undergone heat exchange in the indoor heat exchanger to be blown out into the room, A first detector for detecting the temperature of the decorative panel, It includes a second detector for detecting the temperature of the indoor heat exchanger, The process to be performed by the aforementioned computer is: The steps include obtaining the temperature of the decorative panel detected by the first detector during dehumidification operation, The steps include obtaining the temperature of the indoor heat exchanger detected by the second detector during the dehumidification operation, The steps include calculating the dew point temperature of the decorative panel, A control method comprising the step of controlling the rotation speed of the fan based on the temperature of the decorative panel detected by the first detector, the temperature of the indoor heat exchanger detected by the second detector, and the dew point temperature.

Description

This disclosure relates to an air conditioning system and a method for controlling an air conditioning system. Mild cooling dehumidification is one of the dehumidification methods used in conventional heat pump air conditioning systems. In mild cooling dehumidification, in addition to lowering indoor humidity, the indoor temperature also decreases, which can cause discomfort to users due to excessively low indoor temperatures. As a technology to prevent such discomfort, Japanese Patent Publication No. 2014-153008 (Patent Document 1) discloses an air conditioning system that performs corrective control to reduce the rotation speed of the indoor fan in order to maintain dehumidification capacity while suppressing an excessive drop in indoor temperature. Japanese Patent Publication No. 2014-153008 This diagram shows the refrigerant circuit of an air conditioning system according to Embodiment 1.This figure shows the external appearance of the indoor unit according to Embodiment 1.This is a block diagram of the control device according to Embodiment 1.This is a schematic diagram showing an example of controlling the rotation speed of the indoor fan during dehumidification operation according to Embodiment 1.This flowchart shows the control of the indoor fan during dehumidification operation according to Embodiment 1.This figure shows the external appearance of the indoor unit according to Embodiment 2.This is a block diagram of the control device according to Embodiment 2.This is a schematic diagram showing an example of controlling the rotation speed of the indoor fan and the heating unit during dehumidification operation according to Embodiment 2.This flowchart shows the control of the heating unit during dehumidification operation according to Embodiment 2. The embodiments of this disclosure will be described in detail below with reference to the drawings. In the embodiments described below, when numbers, quantities, etc., are mentioned, the scope of this disclosure is not necessarily limited to those numbers, quantities, etc., unless otherwise specified. The same reference numerals will be used for identical or equivalent parts, and redundant descriptions will not be repeated. It is intended from the outset that the configurations in the embodiments will be used in appropriate combinations. Embodiment 1. Figure 1 is a diagram showing the refrigerant circuit of an air conditioning system 100 according to Embodiment 1. As shown in Figure 1, the air conditioning system 100 comprises an outdoor unit 2, an indoor unit 3, and a control device 51. The outdoor unit 2 and the indoor unit 3 are connected by refrigerant piping to form a refrigerant circuit. The outdoor unit 2 comprises a compressor 21, a four-way valve 22, an outdoor heat exchanger 23, an outdoor fan 24, an expansion device 25, and a fifth detector 45. The indoor unit 3 comprises an indoor heat exchanger 31, an indoor fan 32, a first detector 41, a second detector 42, a third detector 43, and a fourth detector 44. The compressor 21 draws in low-temperature, low-pressure refrigerant, compresses it, and discharges it as high-temperature, high-pressure gaseous refrigerant. The compressor 21 is driven, for example, by an inverter, and its capacity (the amount of refrigerant discharged per unit time) is controlled. The four-way valve 22 switches the circulation direction of the refrigerant according to the operating mode of the air conditioning system 100. The outdoor heat exchanger 23 has multiple heat transfer tubes and performs heat exchange between the refrigerant passing through the multiple heat transfer tubes and the air from outside that is blown in by the outdoor fan 24 installed next to the outdoor heat exchanger 23. The outdoor fan 24 blows air from outside into the outdoor heat exchanger 23. The expansion device 25 expands and depressurizes the refrigerant. The expansion device 25 is a device that can arbitrarily control the opening degree of, for example, an electronic expansion valve. The fifth detector 45 is a temperature sensor that detects the temperature of the outside air. The indoor heat exchanger 31 has multiple heat transfer tubes and performs heat exchange between the air from the room, which is blown in by the indoor fan 32 located next to the indoor heat exchanger 31, and the refrigerant passing through the multiple heat transfer tubes. The indoor fan 32 blows air from the room to the indoor heat exchanger 31. The first detector 41 detects the temperature of the decorative panel, which will be described later. The second detector 42 is a temperature sensor that detects the temperature of the indoor heat exchanger 31. The temperature detected by the second detector 42 is also the temperature of the refrigerant flowing through the indoor heat exchanger 31. The third detector 43 is a temperature sensor that detects the room temperature. The fourth detector 44 is a humidity sensor that detects the humidity of the room. The control devi