JP2020012578A - Control device, air conditioning system and control method - Google Patents

Abstract

To provide a control method which prevents dew condensation on a radiation surface in a radiation type air conditioning system.SOLUTION: In an operation of an air conditioning system which includes an air conditioner for sucking the air in an air-conditioning target space and for controlling the temperature of the air, a radiation panel module arranged on a surface coming into contact with the space, a fan for delivering the air whose temperature has been controlled by the air conditioner to the radiation panel module, and a blowout port for blowing out the air which has passed the radiation panel module to the space, a control device lowers the rotational frequency of the fan when the temperature of the radiation surface of the radiation panel module becomes within a predetermined range based on a dew point temperature of the space, in a state where the temperature of the space has become within a predetermined range based on the set temperature during a cooling operation.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a control device, an air conditioning system, and a control method.

  In Patent Literature 1, air-conditioning air whose temperature is controlled by an air conditioner is sent to a panel board arranged on a floor surface, and the panel board is cooled or heated to radiate cool air or warm air from the panel board into a room. A pneumatic radiant air conditioning system is disclosed. In this pneumatic radiant air conditioning system, the conditioned air that has passed through the panel board is blown into the room from the grill at the end of the panel board. Thereby, the room can be cooled and heated not only by the heat radiation from the panel board but also by the conditioned air. Patent Literature 1 describes that air-conditioned air blown into a room is sucked into an air conditioner again and reused.

  Patent Literature 2 discloses a method for controlling a floor cooling device that supplies cold water cooled by a heat pump to a water channel behind the floor so that dew condensation does not occur on the surface of the floor material and a stable surface temperature is obtained. I have. Patent Document 2 discloses a heat pump that detects the temperature of the floor material surface with a radiation thermometer to prevent dew condensation on the floor material surface, and that the temperature of the floor material surface becomes equal to or lower than a reference temperature set based on the dew point temperature. The control for stopping the operation of the vehicle is described.

JP-A-2004-232929 JP 2011-174657 A

  In the pneumatic radiant air-conditioning system as described in Patent Literature 1, when the panel board on the floor surface is cooled during cooling, there is a possibility that the surface of the panel board is dewed. The dew condensation prevention control (heat pump stop) in the floor cooling device that circulates cold water described in Patent Literature 2 is not always suitable for an air-type radiant air conditioning system that circulates conditioned air indoors. For example, when the operation of the air conditioner is stopped, the blowing of the conditioned air from the grill is stopped during that time, and the comfort may be reduced. There is a need for dew condensation prevention control suitable for a pneumatic radiant air conditioning system.

  Therefore, an object of the present invention is to provide a control device, an air conditioning system, and a control method that can solve the above-described problems.

  According to one embodiment of the present invention, the control device is an air conditioner that controls the temperature of the air by inhaling air in a space to be air-conditioned, and a radiant panel module disposed on a surface in contact with the space, In the operation of an air conditioning system including a fan that sends out the air temperature-controlled by the air conditioner to the radiant panel module and an outlet that blows the air that has passed through the radiant panel module into the space, a cooling operation is performed. When the temperature of the space inside is lower than a predetermined first temperature and the temperature of the radiation surface of the radiation panel module is lower than a predetermined second temperature, the rotation speed of the fan is reduced to a predetermined value.

  According to one aspect of the present invention, in the control device, the first temperature is a temperature higher than a set temperature by a first threshold, and the second temperature is a temperature higher than a dew point temperature of the space by a second threshold. It is.

  According to one aspect of the present invention, the control device is configured such that when a temperature of the space during the cooling operation is higher than a third predetermined temperature and a temperature of a radiation surface of the radiation panel module is lower than a predetermined fourth temperature, The rotation speed of the fan is increased to a predetermined value.

  According to an aspect of the present invention, in the control device, the third temperature is a temperature higher than a set temperature by a third threshold, and the fourth temperature is a temperature higher than the dew point temperature of the space by a fourth threshold. It is.

  According to one embodiment of the present invention, the air conditioning system sucks air in a space to be air-conditioned and controls an air conditioner that controls the temperature of the air, and a radiant panel module disposed on a surface in contact with the space. A fan for sending the air temperature-controlled by the air conditioner to the radiation panel module, an outlet for blowing the air passing through the radiation panel module into the space, and a surface of a radiation surface of the radiation panel module A sensor for measuring temperature and the control device according to any one of the above.

  According to one aspect of the present invention, the control method includes: an air conditioner that suctions air in a space to be air-conditioned and controls the temperature of the air; and a radiant panel module disposed on a surface in contact with the space. In the operation of an air conditioning system including a fan that sends out the air temperature-controlled by the air conditioner to the radiant panel module and an outlet that blows the air that has passed through the radiant panel module into the space, a cooling operation is performed. When the temperature of the radiation surface of the radiation panel module falls within a predetermined range based on the dew point temperature of the space while the temperature of the space is within a predetermined range based on a set temperature, the fan Decrease the speed.

  According to one aspect of the present invention, in the control method, in a state where the temperature of the space is higher than a set temperature by a predetermined threshold or more during the cooling operation, the temperature of the radiation surface of the radiation panel module reduces the dew point temperature of the space. When the value falls within a predetermined range as a reference, the rotation speed of the fan is increased.

  ADVANTAGE OF THE INVENTION According to this invention, in a radiation type air conditioning system, the dew condensation on the surface (radiation surface) of a radiation panel can be prevented.

It is a schematic diagram showing an example of an air conditioning system in one embodiment of the present invention. It is a figure which shows the radiation panel in one Embodiment of this invention, and its arrangement example. It is a figure showing an example of a refrigerant circuit in one embodiment of the present invention. It is a block diagram showing an example of a control device in one embodiment of the present invention. It is a flowchart of the dew condensation prevention control in one Embodiment of this invention.

<Embodiment>
Hereinafter, the air conditioning system of the present embodiment will be described with reference to the drawings.
FIG. 1 is a schematic diagram illustrating an example of an air conditioning system according to an embodiment of the present invention.
The air conditioning system 100 includes an indoor unit 10, an outdoor unit 20, radiation panel modules 40A and 40B, and a duct 13. Hereinafter, the radiation panel modules 40A, 40B and the like may be collectively referred to as the radiation panel module 40.
The indoor unit 10 is installed at the back of the ceiling of the space W0 in the room to be air-conditioned, sucks the air W in the space W0 from the suction port W1, adjusts the air W to an appropriate temperature, and sends the air W to the duct 13. . At least one radiant panel module 40 is arranged on a floor, a wall surface, a ceiling, or the like of the space W0, and the temperature-controlled air W sent to the duct 13 is supplied to the radiant panel module 40. The radiant panel module 40 includes a radiant panel that radiates radiation heat to the space W0, and an air passage through which the air W supplied from the indoor unit 10 passes. The radiating panel is disposed on a surface such as a floor, a wall, or a ceiling such that a radiating surface (radiating panel) faces the space W0 side so as to be in contact with the space W0. Cool or heat the radiant panel. When the radiant panel is cooled or heated, the radiant heat is transmitted to the space W0 via the radiant panel to cool or heat the space W0. The radiation panel module 40A and the radiation panel module 40B are connected by piping or the like, and the air W that has passed through the radiation panel module 40A is supplied to the radiation panel module 40B. The air W supplied from the indoor unit 10 passes through the radiating panel module 40A and the radiating panel module 40B, is blown out from the outlet W2A into the space W0, and cools or heats the space W0. As described above, the air conditioning system 100 performs air conditioning by the two methods of the radiation type and the convection type to perform cooling and heating of the space W0.

  The air conditioning system 100 includes a temperature sensor 16 that measures the surface temperature of the radiation panel of the radiation panel module 40. The temperature sensor 16 that measures the temperature of the radiation surface is, for example, the infrared temperature sensor 14. Alternatively, the temperature sensor 16 may be thermocouples 15A, 15B provided on the radiation surface of the radiation panel modules 40A, 40B. When radiating panel module 40 is arranged on the floor surface as in the example of FIG. 1, temperature sensor 16 measures the floor surface temperature.

Next, an example of the configuration and arrangement of the radiation panel module 40 will be described.
FIG. 2 is a diagram showing a radiating panel module and an example of its arrangement according to an embodiment of the present invention. FIG. 2 shows a plan view of the radiation panel module 40. In the example shown in FIG. 2, four radiating panel modules 40A, 40B, 40C, and 40D are arranged on the floor of the space W0. The configuration of the radiation panel module 40 will be described using the radiation panel module 40A as an example. The radiation panel module 40A includes a damper 42A, flow path forming members 41A1, 41A2, 41A3, 41A4, 41A5, 41A6, a damper control unit 43A, an inlet unit 44A, and an outlet unit 45A. The upper surface (the floor of the space W0) of the radiation panel module 40A is formed by a radiation panel (not shown). The damper control unit 43A controls the opening and closing operation of the damper 42A based on an instruction from the control device 30. When the damper 42A is at the position indicated by the solid line (open state), the air W flowing from the inlet 44A passes through the bypass flow passage 46A in the direction indicated by the solid arrow, and is sent out from the outlet 45A. On the other hand, when the damper 42A is at the position shown by the broken line under the control of the damper control unit 43A (closed state), the air W flowing from the inlet 44A flows in the heat exchange channels 47A1, 47A2, 47A2 in the direction shown by the broken arrow. It passes through 47A3, 47A4, 47A5, 47A6, 47A7, and is sent out from the outlet 45A.

  When the air W passes through the heat exchange channel 47A1, etc., the radiation heat from the radiant panel module 40A increases, and the floor (radiant panel) becomes warm during heating. Conversely, when the air W passes through the bypass flow passage 46A, the temperature rise of the floor in the area where the radiant panel module 40A is arranged is suppressed, and the warm air W is used for convective air conditioning. For example, when the user spends in the area where the radiation panel module 40A is arranged, the remote controller or the like issues an instruction to switch the damper 42A of the radiation panel module 40A, so that the air W passes through the heat exchange channel 47A1 or the like. Can be controlled. Alternatively, when the user spends in the area where the radiating panel module 40A is arranged during the cooling operation, the remote controller issues an instruction to switch the damper 42A to suppress the foot from cooling down, and the air W passes through the bypass flow path 46A. Can be controlled to The radiation panel modules 40B to 40D have the same configuration.

  As shown, the radiation panel module 40A and the radiation panel module 40B are connected by a pipe 50A. Similarly, the radiation panel module 40C and the radiation panel module 40D are connected by a pipe 50C. The duct 13 branches into two and is connected to the inlets 44A and 44C. The air W whose temperature has been controlled is supplied from the indoor unit 10 to the entrance 44A of the radiation panel module 40A and the entrance 44C of the radiation panel module 40C via the duct 13. The air W supplied to the radiant panel module 40A passes through the bypass channel 46A or the heat exchange channel 47A1, etc., and is supplied from the outlet 45A to the inlet 44B of the radiant panel module 40B via the pipe 50A. Similarly, the air W supplied to the radiant panel module 40C passes through the inside of the radiant panel module 40C, and is supplied from the outlet 45C to the inlet 44D of the radiant panel module 40D via the pipe 50C. The same applies to the radiation panel modules 40B and 40D. The air W sent out from the outlets 45B and 45D by the radiant panel modules 40B and 40D is blown out from the outlets W2A to W2D into the space W0.

  Since the dampers 42A and the like of the radiant panel modules 40A to 40D can be independently controlled, for example, only the radiant panel module 40A closes the damper 42A so that the air W flows through the heat exchange channel 47A1 and the like. Regarding the radiation panel modules 40B to 40D, the dampers 42B to 42D can be controlled to be in the open state, respectively.

  The air W blown out from the outlets W2A to W2D into the space W0 cools or heats the space W0, and is sucked into the indoor unit 10 again from the inlet W1. As illustrated in FIGS. 1 and 2, the intake port W1 on the ceiling and the outlet ports W2A to W2D can be provided at separate positions, and a plurality of radiating panel modules 40 can be arranged between them. For example, if the inlet W1 and the outlet W2A are provided at positions near both ends of the room to be air-conditioned, the entire room can be air-conditioned evenly in the convective air-conditioning. Further, by connecting the plurality of radiant panel modules 40 in any direction via the pipe 50, the radiant panel can be arranged in a two-dimensional plane. Thereby, the whole room can be air-conditioned by the radiation type air-conditioning.

  Note that the switching of the damper 42A is not limited to the control of switching between the completely open state and the closed state. For example, a stepping motor may be used so that the state can be switched between an open state and a closed state in multiple stages. Thereby, the flow rate of the air W flowing into the heat exchange flow path 47A1 and the like and the flow rate of the air W flowing into the bypass flow path 46A can be adjusted, and more precise temperature control can be performed. For example, if the user feels that the temperature of the floor is high during heating, the damper control unit 43A may control the position of the damper 42A to an intermediate position between the open state and the closed state according to a user's instruction. Then, since a smaller amount of air W flows into the heat exchange channel 47A1 and the like than in the case where the closed state is controlled, it is possible to suppress an increase in the temperature of the floor.

  Returning to FIG. 1, the air W sucked from the suction port W <b> 1 exchanges heat with the indoor heat exchanger 2 provided in the indoor unit 10, is controlled to an appropriate temperature, and is sent out again to the duct 13 by the fan 9. Is done. The indoor unit 10 includes an indoor heat exchanger 2, a fan 9, a temperature sensor 11, a humidity sensor 12, and a control device 30. Further, the control device 30 is connected to the temperature sensor 16. The temperature sensor 11 measures the temperature of the air W sucked from the suction port W1. The humidity sensor 12 measures the humidity (relative humidity) of the air W sucked from the suction port W1. The control device 30 controls the rotation speed of the fan 9 based on the measurement values of the temperature sensor 11 and the humidity sensor 12 and sends out the air W to the duct 13. The indoor unit 10 is connected to the outdoor unit 20 via a refrigerant pipe 6, a communication line (not shown), and the like. The indoor unit 10 and the outdoor unit 20 constitute a refrigeration cycle, heat and cool the refrigerant by circulating the refrigerant in the refrigeration cycle, and control the air W to a desired temperature through the indoor heat exchanger 2. .

Here, the operation of the refrigeration cycle by the indoor unit 10 and the outdoor unit 20 will be described with reference to FIG. FIG. 3 is a diagram illustrating an example of a refrigerant circuit according to an embodiment of the present invention.
As shown in FIG. 3, the indoor unit 10 includes the indoor heat exchanger 2 and the fan 9. The outdoor unit 20 includes a compressor 1, an expansion valve 3, an outdoor heat exchanger 4, and a four-way valve 5. The compressor 1, the indoor heat exchanger 2, the expansion valve 3, the outdoor heat exchanger 4, and the four-way valve 5 are connected by a refrigerant pipe 6.
The compressor 1 compresses the refrigerant and discharges the compressed high-temperature, high-pressure refrigerant. In the heating operation, the refrigerant circulates in the direction of arrow 8. That is, the refrigerant discharged from the compressor 1 is supplied to the indoor heat exchanger 2 via the four-way valve 5. In the indoor heat exchanger 2, the refrigerant radiates heat to the air W sucked from the suction port W1, condenses and liquefies. The condensed refrigerant is decompressed by the expansion valve 3 and becomes a low-pressure refrigerant. The low-pressure refrigerant is supplied to the outdoor heat exchanger 4, and is vaporized by absorbing heat from the outside air. The vaporized refrigerant passes through the four-way valve 5 and is sucked into the compressor 1. The compressor 1 compresses a low-pressure refrigerant and discharges a high-pressure refrigerant.

  In the cooling operation, the refrigerant circulates in the direction of arrow 7. That is, the high-pressure refrigerant discharged from the compressor 1 is supplied to the outdoor heat exchanger 4 via the four-way valve 5 and radiates heat to the outside air to be condensed. The condensed refrigerant is decompressed by the expansion valve 3. The low-pressure refrigerant is supplied to the indoor heat exchanger 2 and absorbs heat from the air W to cool the air W and evaporate. The vaporized refrigerant passes through the four-way valve 5 and is sucked into the compressor 1. The compressor 1 compresses a low-pressure refrigerant and discharges a high-pressure refrigerant.

  The control device 21 of the outdoor unit 20 switches the four-way valve 5 according to heating and cooling, and drives the compressor 1 at a rotation speed according to the difference between the temperature of the air W measured by the temperature sensor 11 and the set temperature. Thus, the refrigeration cycle is operated such that the temperature of the space W0 becomes the set temperature set by the user. The air W and the refrigerant exchange heat in the indoor heat exchanger 2. The control device 30 controls the fan 9 at a predetermined rotation speed, and sends out the air W after the heat exchange controlled to a desired temperature to the duct 13. In addition, for example, when the floor surface temperature approaches the dew point temperature of the space W0, the control device 30 controls the rotation speed of the fan 9 to prevent dew condensation on the floor surface (radiant panel surface). .

FIG. 4 is a block diagram illustrating an example of a control device according to an embodiment of the present invention.
The control device 30 is, for example, a computer device such as a microcomputer. As illustrated, the control device 30 includes a sensor information acquisition unit 31, a setting information acquisition unit 32, a timer 33, a storage unit 34, a control unit 35, and a communication unit 36. Although the control device 30 performs various controls on the indoor unit 10, in the present specification, a function of controlling dew condensation on the radiant panel surface (the surface in contact with the space W <b> 0) by the rotation speed of the fan 9 is mainly described. Will be described.

The sensor information acquisition unit 31 acquires the measured value of the temperature of the air W from the temperature sensor 11, the measured value of the humidity of the air W from the humidity sensor 12, and the floor surface temperature (surface temperature of the radiation surface) from the temperature sensor 16.
The setting information acquisition unit 32 acquires various setting information input by a user from a remote controller or the like. For example, the setting information acquisition unit 32 instructs start and stop of operation, setting of cooling / heating, setting of room temperature, setting of air volume, and which area of the floor (any of the radiation panel modules 40A to 40D) is to be heated ( Or whether to cool).
The timer 33 measures time.
The storage unit 34 stores various information such as measured values of temperature and humidity acquired by the sensor information acquisition unit 31 and various setting information acquired by the setting information acquisition unit 32. Further, the storage unit 34 stores various programs that realize the functions of the control device 30.

  The control unit 35 controls the indoor unit 10 and controls the air conditioning system 100 in cooperation with the outdoor unit 20. For example, when the setting information acquisition unit 32 acquires a cooling operation start instruction and a set temperature at the time of cooling, the control unit 35 transmits the measurement of the temperature sensor 11 to the control device 21 of the outdoor unit 20 via the communication unit 36. Notify the setting information together with the value. The control device 21 drives the compressor 1 based on the difference between the measured value of the temperature sensor 11 and the set temperature, and operates the refrigeration cycle so that the air W reaches a desired temperature. Further, for example, when the setting information acquisition unit 32 acquires the setting information of the predetermined air volume, the control unit 35 controls the rotation speed of the fan 9 so that the air volume of the air W supplied to the duct 13 becomes the predetermined air volume. I do. For example, when the air volume can be set in three stages of high, medium, and low, the rotation speed of the fan 9 is determined for each of those settings, and the control unit 35 determines the rotation speed corresponding to the air volume setting set by the user. Drives the fan 9. Further, for example, when the user sets so that the area of the radiation panel module 40A is not cooled too much during cooling, the control unit 35 instructs the damper control unit 43A to open the damper 42A.

  The control unit 35 calculates the temperature difference ΔTa between the temperature of the space W0 and the temperature set by the user, and the temperature difference ΔTp between the floor surface temperature during cooling operation (the surface temperature of the radiation surface of the radiation panel module 40) and the dew point temperature of the space W0. The number of revolutions of the fan 9 is changed based on this. For example, when ΔTa is equal to or less than a predetermined threshold Th1 (the temperature of the space W0 is close to the set temperature) and ΔTp is equal to or less than the predetermined threshold Th2 (the floor temperature is close to the dew point temperature), the control unit 35 The number of rotations 9 is reduced to a predetermined number of rotations. The reason why the rotation speed of the fan 9 is reduced is to perform dehumidification. When the number of revolutions of the fan 9 is reduced, the amount of air per unit time of the air W passing through the indoor heat exchanger 2 decreases. Therefore, the air W is cooled to a lower temperature by heat exchange with the indoor heat exchanger 2. By cooling the air W, the moisture of the air W is removed, and the humidity of the air W after the heat exchange becomes lower than when the rotation speed of the fan 9 is high. For example, by controlling the rotation speed of the fan 9, the temperature of the air W cooled by the indoor heat exchanger 2 becomes lower than the dew point temperature calculated from the temperature measured by the temperature sensor 11 and the humidity measured by the humidity sensor 12. If the air volume can be adjusted to a suitable value, the dehumidifying effect of the indoor heat exchanger 2 can be enhanced. The air W thus dehumidified is returned to the room through the duct 13 and the radiation panel module 40. Thereby, the humidity of the space W0 also decreases, and the dew condensation on the floor surface can be prevented.

  In addition, the control unit 35 determines that the temperature difference ΔTa during the cooling operation is equal to or more than a predetermined threshold Th3 (a high temperature state in which there is a difference between the temperature of the space W0 and the set temperature) and ΔTp is equal to or less than the predetermined threshold Th4 (floor surface). If the temperature is close to the dew point temperature), the control unit 35 increases the rotation speed of the fan 9 to a predetermined rotation speed. Generally, when cooling is performed by the air-type radiation air conditioning system, the surface temperature of the radiation panel is lower than that of the space W0. Therefore, the rotation speed of the fan 9 is increased so that the floor surface temperature does not decrease to the dew point temperature, and the decrease in the floor surface temperature is suppressed. For example, when the number of revolutions of the fan 9 is increased during cooling, the amount of air per unit time of the air W passing through the indoor heat exchanger 2 increases. Then, the air W passes through the indoor heat exchanger 2 before being sufficiently cooled and is sent out to the duct 13. That is, the temperature of the air W sent from the indoor unit 10 is higher than when the air volume is small. As a result, it is possible to suppress a decrease in the floor surface temperature and prevent dew condensation on the floor surface. In addition, by increasing the air volume, more cooled air W can be supplied to the space W0, so that the temperature of the space W0 reaches the set temperature quickly.

  In addition, while the control unit 35 performs the dew condensation prevention control for increasing or decreasing the rotation speed of the fan 9, in the outdoor unit 20, the control device 21 performs the same control as the normal cooling operation. For example, the control device 21 controls the rotation speed of the compressor 1 so that the temperature difference between the set temperature designated by the user and the space W0 is eliminated. The control unit 35 changes the rotation speed of the fan 9 irrespective of the operation of the refrigeration cycle by the control device 21 to prevent the occurrence of dew condensation.

  The communication unit 36 performs communication with the control device 21. For example, when the setting information acquisition unit 32 acquires an operation stop instruction, the communication unit 36 transmits the operation stop instruction to the control device 21 of the outdoor unit 20. The communication section 36 communicates with the damper control section 43A and the like. For example, when the control unit 35 instructs to close the damper 42A, the communication unit 36 transmits the instruction information to the damper control unit 43A.

Next, a process flow of the dew condensation prevention control according to the present embodiment will be described by taking the configuration of the air conditioning system 100 in FIGS.
FIG. 5 is a flowchart of the dew condensation prevention control according to the embodiment of the present invention.
As a premise, the air conditioning system 100 performs a cooling operation according to a user's instruction. The communication unit 36 transmits the temperature of the space W0 (the temperature of the air W at the suction port W1) acquired by the sensor information acquisition unit 31 to the control device 21 of the outdoor unit 20 at predetermined time intervals. Control device 21 adjusts the rotation speed of compressor 1 so that the temperature of space W0 approaches the set temperature.

  In the indoor unit 10, the sensor information acquisition unit 31 acquires the temperature measured by the temperature sensors 11, 16 at predetermined time intervals. Further, the sensor information acquisition unit 31 acquires the humidity measured by the humidity sensor 12 (Step S11). The sensor information acquisition unit 31 records the temperature and the humidity in the storage unit 34 together with the acquisition time.

Next, the control unit 35 calculates the temperature differences ΔTa and ΔTp using the acquired temperature and humidity (step S12). First, the control unit 35 calculates the absolute value of the difference between the temperature measured by the temperature sensor 11 and the set temperature specified by the user (Equation (1)), and sets the calculated value to ΔTa.
ΔTa = | temperature of space W0−set temperature | (1)

Further, the control unit 35 calculates the dew point temperature of the space W0 from the humidity measured by the humidity sensor 12 and the temperature measured by the temperature sensor 11. The control unit 35 calculates ΔTp by subtracting the dew point temperature from the floor surface temperature measured by the temperature sensor 16 (Equation (2)).
ΔTp = floor temperature-dew point temperature ... (2)
The control unit 35 controls the rotation speed of the fan 9 based on ΔTa and ΔTp.

  First, the control unit 35 determines whether a condition that ΔTa is equal to or smaller than the threshold Th1 and ΔTp is equal to or smaller than the threshold Th2 is satisfied (step S13). Here, the threshold Th1 is a threshold for determining whether the temperature of the space W0 is sufficiently close to the set temperature. The threshold Th2 is a threshold for determining whether the floor surface temperature is approaching the dew point temperature. The threshold value Th2 may be set to a relatively large value so that dew condensation prevention control can be started before dew condensation occurs. When ΔTa ≦ threshold Th1 and ΔTp ≦ threshold Th2 are satisfied (step S13; Yes), the control unit 35 sets the rotation speed of the fan 9 to a low speed (step S14). The low speed is, for example, a rotation speed corresponding to the lowest air volume among preset selectable air volumes. Alternatively, the rotation speed may be a rotation speed corresponding to an air flow smaller than the lowest air flow that can be selected by the user and provided for the dew condensation prevention control. When ΔTa is equal to or less than the threshold Th1, the indoor temperature is close to the set temperature, and thus the compressor 1 is operating at a relatively low load. In such an operation state, there is little room for changing the temperature of the space W0 and the floor surface temperature. In such a situation, the air W circulating in the space W0, the indoor unit 10, the duct 13, and the radiation panel module 40 is dehumidified by reducing the rotation speed of the fan 9. Thereby, dew condensation on the floor surface can be prevented.

  When ΔTa ≦ threshold Th1 and ΔTp ≦ threshold Th2 are not satisfied (Step S13; No), the control unit 35 determines whether the condition that ΔTa is equal to or more than the threshold Th3 and ΔTp is equal to or less than the threshold Th4 is satisfied (Step S15). . Here, the threshold Th3 is a threshold for determining whether the temperature of the space W0 deviates from the set temperature. A value greater than the threshold Th1 is set as the threshold Th3. Further, the threshold value Th4 is set to a value such that the floor surface temperature is higher than the dew point temperature so that no dew condensation occurs as in the case of the threshold value Th2, and the risk of dew condensation increases when the floor surface temperature falls below the threshold value Th4. When ΔTa ≧ threshold Th3 and ΔTp ≦ threshold Th4 are satisfied (step S15; Yes), the control unit 35 sets the rotation speed of the fan 9 to high speed (step S16). The high speed is, for example, a rotation speed corresponding to the highest air volume among preset selectable air volumes. Alternatively, the rotation speed corresponding to the air volume set for the dew condensation prevention control (the air volume set so that the temperature of the air W sent from the indoor unit 10 is such that the floor surface temperature can be prevented from lowering). It may be.

  When ΔTa is equal to or larger than the threshold Th3, the temperature of the space W0 is higher than the set temperature, and thus the compressor 1 is operating at a relatively high load. Further, since the temperature of the space W0 is relatively high, for example, if the relative humidity is the same, the dew point temperature becomes higher than the environment where the condition of Step S13 is satisfied. In the cooling operation, the floor surface temperature is lower than that of the space W0 because the cooled air W passes therethrough. If the fan 9 is set to a low speed in this state, the dehumidifying effect can be expected, but the temperature of the floor surface may be reduced, which may cause dew condensation. Therefore, when the difference between the floor surface temperature and the dew point temperature is within a predetermined range (threshold value Th4 or less) and the room temperature is higher than the set temperature, the fan 9 is operated at a high speed to send a large amount of cooling air into the room. The temperature of the space W0 is preferentially reduced, and the relatively high temperature of the air W is caused to pass through the flow path of the radiating panel module 40 to suppress a decrease in the floor surface temperature. As a result, the state in which the floor surface temperature is higher than the dew point temperature by the threshold Th4 or more is maintained, and the occurrence of dew condensation is prevented.

  When ΔTa ≧ threshold Th3 and ΔTp ≦ threshold Th4 do not hold (step S15; No), the control unit 35 sets the rotation speed of the fan 9 to a predetermined value (step S17). The predetermined value is, for example, a rotation speed corresponding to the air volume set by the user.

  Next, the control unit 35 determines whether to end the cooling operation (Step S18). For example, the control unit 35 determines that the cooling operation is to be ended when the setting information obtaining unit 32 obtains information for instructing to stop the operation. When the operation is to be ended (Step S18; Yes), the control devices 21 and 30 perform a cooling operation end process. For example, the control device 21 stops the compressor 1. Further, the control unit 35 stops the fan 9.

  If the operation is not to be ended (Step S18; No), the processing after Step S11 is repeated. The control unit 35 obtains the current temperature and humidity to determine whether or not to perform the dew condensation prevention control (steps S13 and S15), and increases the rotation speed of the fan 9 according to the temperature and humidity at that time (steps S13 and S15). (Step S14) or decrease (Step S16). If the dew condensation prevention control has already been performed, the dew condensation prevention control is continued if the condition of step S13 or step S15 is satisfied, and if the condition is not satisfied, the rotation speed of the fan 9 is restored (step S13). S17). By such control, dew condensation on the floor surface can be prevented.

  According to the present embodiment, the air conditioner (the indoor unit 10 and the outdoor unit 20) that inhales the air W in the space W0 to be air-conditioned and controls the temperature of the air W is disposed on a surface in contact with the space W0. A radiation panel module 40, a fan 9 for sending out the air W whose temperature is controlled by the air conditioner to the radiation panel module 40, an outlet W2A for blowing the air W passing through the radiation panel module 40 to the space W0, and the like. In the air-conditioning system 100, the temperature of the radiation surface (radiation panel) of the radiation panel module 40 is based on the dew point temperature of the space W0 in a state where the temperature of the space W0 is within a predetermined range based on the set temperature during the cooling operation. , The rotation speed of the fan 9 is reduced. Thereby, the relative humidity of the space W0 can be reduced, and dew condensation on the radiation panel can be prevented.

  When the temperature of the radiating surface of the radiating panel module 40 falls within a predetermined range based on the dew point temperature of the space W0 in a state where the temperature of the space W0 is higher than the set temperature by a predetermined threshold during the cooling operation, the rotation of the fan 9 is started. Raise the number. Accordingly, it is possible to prevent the radiation surface temperature from excessively decreasing with respect to the temperature of the space W0, and to prevent dew condensation on the radiation panel.

In addition, it is possible to appropriately replace the components in the above-described embodiment with known components without departing from the spirit of the present invention. The technical scope of the present invention is not limited to the above embodiment, and various changes can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, an example in which the radiation panel module 40 and the like are arranged on the floor surface has been described, but they may be arranged on a ceiling or a wall surface. Further, when there is a difference in surface temperature between positions on the floor or ceiling on which the radiation panel module 40 is provided by switching the damper 42A or the like, even if the temperature at the lowest position is the radiation surface temperature, ΔTp may be calculated. Good.
The threshold Th1, the threshold Th2, the threshold Th3, and the threshold Th4 are examples of a first threshold, a second threshold, a third threshold, and a fourth threshold, respectively.

DESCRIPTION OF SYMBOLS 1 ... Compressor 2 ... Indoor heat exchanger 3 ... Expansion valve 4 ... Outdoor heat exchanger 5 ... Four-way valve 6 ... Refrigerant pipe 9 ... Fan 10 ... Indoor Unit 11 Temperature sensor 12 Humidity sensor 13 Duct 14 Infrared temperature sensor 15 Thermocouple 16 Temperature sensor 20 Outdoor unit 21 Control device 30 ... Control device 31 ... Sensor information acquisition unit 32 ... Setting information acquisition unit 33 ... Timer 34 ... Storage unit 35 ... Control unit 36 ... Communication unit 40A, 40B, 40C, 40D: Radiant panel module 41A1, 41A2, 41A3, 41A4, 41A5, 41A6: Flow path forming member 42A: Damper 43A: Damper control unit 44A: Inlet part 45A: Outlet part 46A ···bypass Roads 47A1, 47A2, 47A3, 47A4, 47A5, 47A6, 47A7: heat exchange channels 50A, 50C: piping 100: air conditioning system W: air W0: space W1: suction port W2A, W2B, W2C, W2D ... outlet

Claims (7)

An air conditioner that sucks air in a space to be air-conditioned and controls the temperature of the air, a radiant panel module disposed on a surface in contact with the space, and the air that is temperature-controlled by the air conditioner. In operation of an air conditioning system including a fan that sends out to the radiant panel module, and an outlet that blows out the air that has passed through the radiant panel module into the space,
When the temperature of the space during the cooling operation is lower than a predetermined first temperature and the temperature of the radiation surface of the radiation panel module is lower than a predetermined second temperature, the rotation speed of the fan is reduced to a predetermined value;
Control device. The first temperature is a temperature higher than a set temperature by a first threshold, and the second temperature is a temperature higher than a dew point temperature of the space by a second threshold.
The control device according to claim 1. When the temperature of the space during the cooling operation is higher than a predetermined third temperature and the temperature of the radiation surface of the radiation panel module is lower than a predetermined fourth temperature, the rotation speed of the fan is increased to a predetermined value;
The control device according to claim 1. The third temperature is a temperature higher by a third threshold value than a set temperature, and the fourth temperature is a temperature higher by a fourth threshold value than the dew point temperature of the space.
The control device according to claim 3. An air conditioner that inhales air in a space to be air-conditioned and controls the temperature of the air,
A radiant panel module arranged on a surface in contact with the space;
A fan for sending the air temperature-controlled by the air conditioner to the radiant panel module,
An outlet for blowing the air that has passed through the radiant panel module into the space;
A sensor for measuring a surface temperature of a radiation surface of the radiation panel module,
A control device according to any one of claims 1 to 4,
Air conditioning system equipped with. An air conditioner that sucks air in a space to be air-conditioned and controls the temperature of the air, a radiant panel module disposed on a surface in contact with the space, and the air that is temperature-controlled by the air conditioner. In operation of an air conditioning system including a fan that sends out to the radiant panel module, and an outlet that blows out the air that has passed through the radiant panel module into the space,
In a state where the temperature of the space is within a predetermined range based on a set temperature during the cooling operation, the temperature of the radiation surface of the radiation panel module is within a predetermined range based on the dew point temperature of the space, Reduce fan speed,
Control method. If the temperature of the radiating surface of the radiating panel module falls within a predetermined range based on the dew point temperature of the space while the temperature of the space is higher than a set temperature by a predetermined threshold during the cooling operation, the rotation speed of the fan Raise the
The control method according to claim 6.

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