JP7042731B2 - Air conditioning control system - Google Patents

Description

The present invention relates to an air conditioning control system, particularly air conditioning control by a radiant air conditioning system.

Conventionally, a convection air-conditioning type indoor unit that air-conditions a room by convection of indoor air has been the mainstream. However, in recent years, from the viewpoint of energy saving, an indoor unit of a radiant air-conditioning system that radiates (radiates) cold air from the ceiling surface by blowing cold air to the back of the ceiling and thereby air-conditioning the room has appeared.

Japanese Unexamined Patent Publication No. 08-189660 Japanese Unexamined Patent Publication No. 2008-014557 Japanese Unexamined Patent Publication No. 2006-214696 Japanese Unexamined Patent Publication No. 11-108420

However, in the conventional radiant air-conditioning type indoor unit, since cold air is blown out to the ceiling, dew condensation is likely to occur in the ceiling.

An object of the present invention is to prevent the occurrence of dew condensation on the ceiling when a radiant air conditioning system that air-conditions the room by blowing cold air to the ceiling is adopted.

The air-conditioning control system according to the present invention is an air-conditioning control system that controls air-conditioning by a radiant air-conditioning system that air-conditions the room by blowing cold air from an outlet provided behind the ceiling of the room and cooling the ceiling surface of the room. If it is determined from the measuring means for measuring the temperature and humidity in the ceiling and the dew point temperature calculated from the temperature and humidity measured by the measuring means, dew condensation may occur on the ceiling. The air-conditioning control means includes an air-conditioning control means for performing air-conditioning control for prevention, and the air- conditioning control means is said to be capable of air-conditioning control in a convection air-conditioning system for air-conditioning the room by convection of air in the room. As an air conditioning control for preventing dew condensation, when the temperature of the room rises by a predetermined value or more by raising the set temperature of the cold air blown out from the outlet, the set temperature of the cold air blown out from the outlet is raised. It is characterized in that the air conditioning control of the room is switched from the radiant air conditioning system to the convection air conditioning system .

Further, the air conditioning control means is characterized in that when the temperature of the room approaches or reaches a set temperature within a predetermined threshold value, the convection air conditioning system is switched to the radiant air conditioning system .

According to the present invention, when a radiant air-conditioning system for air-conditioning a room by blowing cold air to the ceiling is adopted, it is possible to prevent the occurrence of dew condensation on the ceiling.

It is a schematic diagram which shows the outline of the room where the air-conditioning control is performed by one embodiment of the air-conditioning control device which concerns on this embodiment, and the air-conditioning equipment installed in the ceiling of the room. It is a graph which shows the relationship between time and room temperature in a room subject to air conditioning control in this embodiment. It is a flowchart which shows the air-conditioning control process for preventing the dew condensation on the ceiling in this embodiment.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing an outline of a room in which air conditioning is controlled according to an embodiment of the air conditioning control device according to the present invention, and an air conditioning facility installed in the ceiling of the room or the like. FIG. 1 shows a room 1 of a building such as a building in which an air conditioner is installed and an attic 2 of the room 1. FIG. 1 shows a total heat exchanger 3 installed in a building, an indoor unit 4 installed in the ceiling 2, and dampers 5 and 6 as air conditioning equipment. The indoor unit 4 is connected to the total heat exchanger 3 and the dampers 5 and 6 by the duct 7 shown by the double line in FIG. The total heat exchanger 3 takes in outside air (intake) from the outside air intake port 8, exchanges total heat, and supplies it to the indoor unit 4. The indoor unit 4 adjusts the temperature of the air supplied from the total heat exchanger 3 so that the room temperature becomes the target temperature of the room temperature (hereinafter, “set temperature”) set by the user or the like of the room 1. The indoor unit 4 may supply the temperature-controlled air from the outlet 9 to the ceiling 2 via the damper 5 or from the outlet 10 to the room 1 via the damper 6. The former corresponds to a radiant air conditioning system that air-conditions a room (inside the room 1) by blowing cold air from the air outlet 10 and cooling the ceiling surface of the room 1. The latter corresponds to a convection air-conditioning system in which the room is air-conditioned by convection of the air in the room 1. Each air conditioning system can be realized by controlling the opening and closing of the dampers 5 and 6, and the switching control of the dampers 5 and 6 is performed by the controller 11. In FIG. 1, a data control signal line provided between the controller 11 and other components is indicated by a broken line, and the flow direction of the data signal or the control signal is indicated by an arrow.

A temperature / humidity sensor 12 that further measures temperature and humidity is installed behind the ceiling 2, and the controller 11 is controlled by a central monitoring device (not shown) that monitors air conditioning equipment. When it is determined from the dew point temperature calculated from the measured temperature and humidity that dew condensation may occur, dew condensation is prevented on the ceiling back 2 by controlling the operation of the indoor unit 4 and opening / closing of the dampers 5 and 6. Perform air conditioning control for.

The controller 11 can be realized by a conventional general-purpose hardware configuration. That is, the controller 11 is configured by connecting a CPU, a ROM, a RAM and a hard disk drive (HDD) as a storage means, and a network interface as a communication means for communicating with a central monitoring device to an internal bus.

In the present embodiment, the indoor unit of the radiant air-conditioning system is formed by the total heat exchanger 3, the indoor unit 4, the damper 5, and the like, and the indoor unit of the convection air-conditioning system is formed by the total heat exchanger 3, the indoor unit 4, the damper 6, and the like. Form a machine. Although it is necessary to provide the temperature / humidity sensor 12 in the attic 2, the air conditioning equipment itself in the present embodiment can be realized by using the existing air conditioning equipment that can realize both the radiant air conditioning method and the convection air conditioning method. .. In the present embodiment, the total heat exchanger 3 and the indoor unit 4 are also used in each air-conditioning system, but an indoor unit of each air-conditioning system may be configured in a different configuration.

In the above configuration, when the controller 11 controls the air conditioning by the radiant air conditioning method, the opening control of the damper 5 is controlled to be 100%, and the closing control is performed so that the opening degree of the damper 6 is 0%. Then, the outside air taken in from the outside air intake port 8 is totally heat exchanged by the total heat exchanger 3, the temperature is adjusted by the indoor unit 4, and then the outside air is supplied from the outlet 9 to the ceiling 2 via the damper 5. To. Then, the air in the ceiling 2 is sucked in from the return air port 13, and after the total heat exchange is performed by the total heat exchanger 3, the air is exhausted from the exhaust port 14 to the outside of the building.

On the other hand, when the controller 11 controls the air conditioning by the convection air conditioning method, the opening control is performed so that the opening degree of the damper 6 becomes 100%, and the closing control is performed so that the opening degree of the damper 5 becomes 0%. Then, the outside air taken in from the outside air intake port 8 is totally heat exchanged by the total heat exchanger 3, the temperature is adjusted by the indoor unit 4, and then the outside air is supplied to the room from the outlet 10 via the damper 6. Then, the air in the room is sucked in from the return air port 15, exchanged with the total heat exchanger 3, and then exhausted to the outside of the building from the exhaust port 14.

Next, the air conditioning control in the present embodiment will be described. Here, the explanation will be made assuming the summer when the air conditioner is used.

In this embodiment, both the radiant air conditioning system and the convection air conditioning system are used as the air conditioning system. Compared to the convection air conditioning method, the radiant air conditioning method can provide higher comfort and has an excellent energy saving effect, but it takes time for the temperature of the room 1 to reach the set temperature after operating the air conditioning equipment. There is a drawback. In other words, the convection air conditioning system is inferior in energy saving effect to the radiant air conditioning system, but the temperature of the room 1 can be brought closer to the set temperature faster.

Therefore, in the present embodiment, as shown in FIG. 2, when the operation of the air conditioning equipment starts (time point T0), for example, in the morning when the work is started in the room 1, the air conditioning is controlled by the convection air conditioning method. .. More specifically, the controller 11 sets the opening degree of the damper 6 to 100% and the opening degree of the damper 5 to 0% so that the cold air from the indoor unit 4 is supplied to the room 1 from the outlet 10. This makes it possible to reach the set temperature faster than when air conditioning is controlled by the radiant air conditioning method.

Then, when the room temperature approaches or reaches the set temperature (26 ° C. in FIG. 2) within a predetermined threshold value (time point T1), the convection air conditioning system is switched to the radiant air conditioning system. More specifically, the controller 11 controls the opening of the damper 5 from 0% to 100% and closes the opening of the damper 6 from 100% to 0%, whereby the cold air from the indoor unit 4 is released. It is supplied from the air outlet 9 to the ceiling 2.

In this way, when the deviation between the room temperature and the set temperature is larger than a predetermined threshold, air conditioning is controlled by the convection air conditioning method, and when the deviation between the room temperature and the set temperature becomes smaller than the predetermined threshold, the convection air conditioning method is used. Switch the air conditioning control to the radiant air conditioning method.

By the way, when operating the air conditioning equipment by the radiant air conditioning method, the pneumatic ceiling radiation panel (radiation panel) provided on the ceiling is cooled by the cold air of the ceiling back 2, but the temperature, humidity, etc. of the ceiling back 2 are affected. Due to the relationship, dew condensation may occur. Therefore, in the present embodiment, the occurrence of dew condensation is prevented as follows. Hereinafter, the air conditioning control process for preventing the occurrence of dew condensation will be described with reference to the flowchart shown in FIG. This process is executed by the controller 11 executing the program, and when the program is started, the process is repeated until it is stopped. However, it may be carried out at an appropriate time interval such as an interval of 1 minute.

The temperature / humidity sensor 12 measures the temperature and humidity of the ceiling back 2, and the controller 11 acquires the measured temperature and humidity (step 101) and calculates the dew point temperature from the measured values (step 101). 102). As the dew point temperature calculation method, an existing calculation method such as using software or a predetermined table will be used. If there is no possibility of dew condensation from the calculated dew point temperature (N in step 103), the process returns to step 101. On the other hand, when there is a possibility of dew condensation from the calculated dew point temperature (Y in step 103), the controller 11 performs the following air conditioning control for dew condensation prevention (step 104).

Here, the case where dew condensation may occur is not limited to the case where the calculated dew point temperature reaches the dew point temperature at which dew condensation is generated. For example, this includes the case where dew condensation is expected to occur in the near future from the transition of the dew point temperature even if the dew point temperature at which dew condensation is generated has not been reached at this time.

As the first method of air conditioning control, the wind speed of the cold air blown out from the outlet 9 is made stronger than the current wind speed. By increasing the wind speed, the air pressure in the attic 2 in a nearly sealed state rises, and it is expected that the dew point temperature will rise to the extent that dew condensation does not occur.

As a second method of air conditioning control, the temperature of the cold air supplied by the indoor unit 4 is raised. By correcting the current set temperature of cold air upward and supplying it to the attic 2, the temperature in the attic 2 rises, and the dew point temperature can be expected to rise to the extent that dew condensation does not occur.

By the way, in the case of the second air conditioning control method, if the set temperature of the cold air supplied to the ceiling 2 is raised, the cooling effect of the radiant panel on the ceiling is weakened. This may cause the room temperature to rise above the set temperature. Therefore, as shown near the center of the graph in FIG. 2, when the room temperature rises and the deviation between the room temperature and the set temperature becomes larger than a predetermined threshold value (time point T2), the controller 11 convection from the radiant air conditioning system. Switch the air conditioning control to the air conditioning method.

In this way, by raising the set temperature of the cold air supplied to the ceiling 2, the occurrence of dew condensation on the ceiling 2 is prevented, and the harmful effect of raising the room temperature that can occur by raising the set temperature of the cold air is switched between the air conditioning methods. To prevent it. Then, when the room temperature reaches the set temperature or approaches a predetermined threshold value by operating the air conditioning equipment in the convection air conditioning system (time point T3), the controller 11 switches the air conditioning control from the convection air conditioning system to the radiant air conditioning system. ..

Here, since the room temperature rises by raising the set temperature of the cold air, the air conditioning control is switched from the radiant air conditioning method to the convection air conditioning method. However, even if the set temperature of cold air is not raised to prevent dew condensation, for example, in the daytime on a midsummer day, the room temperature may rise due to the influence of the outside air temperature. In this case as well, the air conditioning control may be switched from the radiant air conditioning system to the convection air conditioning system in the same manner as described above.

According to the present embodiment, it is possible to prevent dew condensation that may occur when the air conditioning is controlled by the radiant air conditioning method as described above.

In addition, in this embodiment, the case of the summer when the air conditioner is used has been described as an example. When heating is used, in the radiant air conditioning system, warm air is supplied to the ceiling 2 to heat the ceiling surface, so that dew condensation is unlikely to occur, but dew condensation may occur when humidified. In this case, the air conditioning control described above may be applied.

Further, in the present embodiment, the opening degree of the dampers 5 and 6 is set to 100% or 0%, and the air conditioning system is controlled to be completely switched. However, the opening degree of the dampers 5 and 6 may be adjusted to other than that, for example, 20% and 80%, or 40% and 10% to control the air conditioning. In the latter case, the total opening degree is halved to 50%, so that the energy saving effect can be further enhanced.

Further, in the present embodiment, the case where the radiant air-conditioning method for cooling the ceiling is adopted has been described, but it can also be applied to the case where the radiant air-conditioning method for cooling the underfloor is adopted.

1 room, 2 behind the ceiling, 3 total heat exchanger, 4 indoor unit, 5,6 damper, 7 duct, 8 outside air intake, 9,10 outlet, 11 controller, 12 temperature / humidity sensor, 13,15 return port , 14 Exhaust port.

Claims (2)

In an air conditioning control system that controls air conditioning by a radiant air conditioning method that air-conditions the room by blowing cold air from the air outlet provided behind the ceiling of the room and cooling the ceiling surface of the room.
A measuring means for measuring the temperature and humidity in the attic,
When it is determined from the dew point temperature calculated from the temperature and humidity measured by the measuring means that dew condensation may occur, the air conditioning control means for performing dew condensation prevention air conditioning control on the ceiling back and the air conditioning control means.
Have,
The air conditioning control means sets the cold air blown out from the outlet as the air conditioning control for preventing dew condensation when the air conditioning can be controlled by the convection air conditioning system that air-conditions the room by convection of the air in the room. An air conditioning control system characterized in that when the temperature of the room rises from a set temperature by a predetermined value or more by raising the temperature, the air conditioning control of the room is switched from the radiant air conditioning method to the convection air conditioning method . The air conditioning control system according to claim 1, wherein the air conditioning control means switches from the convection air conditioning system to the radiant air conditioning system when the temperature of the room approaches or reaches a set temperature within a predetermined threshold value. ..

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