JP5818350B2 - Air conditioning control device and air conditioning control method - Google Patents

Description

  The present invention relates to an air conditioning control device and an air conditioning control method, and in particular, a duct that discharges and supplies conditioned air heat-treated by an external air conditioner to an air-conditioned space, and a heat exchanger that is supplied with heat-treated refrigerant. The present invention relates to an air conditioning control device and an air conditioning control method for controlling the temperature and the like of conditioned air supplied from an external air conditioner through a duct in an air conditioning system including a plurality of air conditioning devices.

Conventionally, an air conditioner using a heat exchanger to which a heat-treated refrigerant is supplied is known. This type of air conditioner is also called a “chilled beam”, and a heat exchanger such as a coil or a radiant panel that circulates the refrigerant is arranged on the ceiling of each controlled space to reduce the radiation from the heat exchanger. Since heat transfer is performed by convection, it has recently attracted attention as an air conditioning technology with excellent energy savings.
This kind of “chilled beam” is a “passive chilled beam” that uses the principle of convection to exchange heat, and an “active chilled beam” that supplies conditioned air heat-treated by an external air conditioner to a heat exchanger. The active chilled beam has higher sensible heat cooling efficiency than the passive chilled beam. Hereinafter, in this specification, the active chilled beam is simply referred to as “chilled beam”.

FIG. 15 shows a configuration example of a chilled beam. In FIG. 15, a chilled beam 300 is composed of a heat exchanger 301 disposed behind the ceiling, a duct 302 disposed above the heat exchanger 301, and a casing 303 covering these. . The duct 302 is provided with a blow-out port 302 a that discharges conditioned air toward the periphery of the heat exchanger 301, and supplies the conditioned air to the air-conditioned space through a vent 304 provided in the housing 303.
In such a chilled beam 300, the cooled (or heated) refrigerant supplied from the outside to the heat exchanger 301 circulates, while the conditioned air is heat-treated to a certain level by an external air conditioner via the duct 302. Is pressurized and supplied by a fan. The conditioned air is blown out from the blowout hole 302a toward the vent hole 304. At this time, due to the so-called attraction effect of drawing in the surrounding air and blowing air, the air that has risen inside the room and is cooled (or heated) by the heat exchanger 301 is sucked by the conditioned air supplied from the blowout holes 302a and It is supplied indoors in a mixed state.

FIG. 16 shows a configuration example of an air conditioning system provided with the above-described chilled beam. This air conditioning system includes chilled beams 300a to 300c provided for a plurality of air-conditioned spaces 400a to 400c, a heat source device, a heat exchange device, and a fan, respectively, and heat-treated to these chilled beams 300a to 300c. And an external air conditioner 410 that supplies conditioned air and refrigerant. A refrigerant pipe 420 provided between the external air conditioner 410 and the heat exchangers 301a to 301c of the chilled beams 300a to 300c has a valve for adjusting the flow rate of the refrigerant supplied to the heat exchangers 301a to 301c. 420a to 420c are provided. The duct 430 connecting the external air conditioner 410 and the chilled beams 300a to 300c has variable air volume units 430a to 430c that adjust the amount of conditioned air supplied to each air-conditioned space via the chilled beams 300a to 300c. Is provided. Further, the external air conditioner 410 is provided with a valve 440 that adjusts the amount of refrigerant introduced into the external air conditioner 410 from a heat source device (not shown).
On the other hand, indoor sensors 450a to 450c for measuring room temperature and dew point temperature in the air-conditioned space are arranged in the air-conditioned spaces 400a to 400c. The refrigerant pipe 420 is provided with a water supply temperature sensor 460 that measures the temperature of the refrigerant supplied from the external air conditioner 410 to the heat exchangers 301a to 301c of the chilled beams 300a to 300c. The duct 430 is provided with an air supply sensor 470 that measures the temperature of the conditioned air supplied from the external air conditioner 410.
As a control device for controlling such an air conditioning system, a temperature indicating controller (TIC) 480a to 480c for controlling the opening of the valves 420a to 420c based on the measurement results of the indoor sensors 450a to 450c. And a supply air temperature control TIC 490 that controls the opening degree of the valve 440 based on the measurement result of the air supply sensor 260 (see, for example, Non-Patent Document 1).

  In such an air conditioning system, the constant temperature conditioned air supplied from the external air conditioner 410 to the chilled beams 300a to 300c is further subjected to heat exchange by the heat exchangers 301a to 301c provided in the chilled beams 300a to 300c, respectively. In addition, it is supplied to each of the air-conditioned spaces 400a to 400c. Considering the case of cooling in such an air conditioning system, when the sensible heat load (temperature load) or the latent heat load (humidity) is large, the conditioned air supplied from the external controller 410 to the chilled beams 300a to 300c. Reduce the temperature. Moreover, when those loads are small, it is thought that the energy consumption of the external air handler 410 can be reduced by raising the temperature of the conditioned air, and as a result, further energy saving can be realized.

Federation of European Heating and Air-conditionig Association, Chilled Beam application GUIDEBOOK

However, if the temperature of the conditioned air is raised, the dew point temperature also rises, so that condensation may occur in the heat exchanger.
However, the chilled beam is not supposed to provide a mechanism for discharging condensed water to a heat exchanger such as a coil or a radiation panel because of its structure. Therefore, in the conventional technique, it is difficult to control the temperature of the conditioned air while avoiding the occurrence of condensation, and as a result, it is difficult to realize energy saving.

  Accordingly, an object of the present invention is to provide an air conditioning control device and an air conditioning control method capable of preventing the occurrence of condensation in an air conditioning system using a chilled beam.

  In order to solve the above-described problems, an air conditioning control device according to the present invention is an air conditioning device that is disposed on each of the ceilings of a plurality of air-conditioned spaces, and is conditioned air that has been heat-treated by an external air conditioner. It is an air conditioning control device that controls the supply temperature of conditioned air supplied through a duct to an air conditioning device that includes a duct that supplies air to the air-conditioned space and a heat exchanger that is supplied with heat-treated refrigerant. Based on the dew point temperature of the air-conditioned space measured by the first sensor provided in each air-conditioned space and the temperature of the refrigerant supplied to the heat exchanger measured by the second sensor A first calculation unit that calculates a dew condensation status indicating the possibility of dew condensation in the heat exchanger for each air conditioner, and a plurality of air conditioning units based on the plurality of dew condensation statuses calculated by the first calculation unit. Equipment heat exchanger A second calculation unit that calculates the total dew condensation status indicating the possibility of occurrence of dew condensation in any one of the above, and the conditioned air supplied from the external controller based on the total dew condensation status calculated by the second calculation unit And a control unit for controlling the supply air temperature.

  Further, in the air conditioning control device, a first storage unit storing a relationship between a difference between the dew point temperature measured by the first sensor and the temperature measured by the second sensor and the dew condensation status, and the air conditioning device A second storage unit that stores the relationship between the combination of the dew condensation status calculated for each of the above and the total dew condensation status, and a second storage unit that stores the relationship between the total dew condensation status and the control amount of the conditioned air supply temperature. 3, and the first calculation unit includes a dew point temperature measured by the first sensor, a temperature measured by the second sensor, and a relationship stored in the first storage unit. Based on the dew condensation status for each air conditioner calculated by the first calculation unit and the relationship stored in the second storage unit, the dew condensation status is calculated based on the dew condensation status. The control unit may determine the supply air temperature of the conditioned air based on the total dew condensation status, the relationship stored in the third storage unit, and the current supply air temperature of the conditioned air. Good.

  Further, in the above air conditioning control device, based on the room temperature of the air-conditioned space measured by the third sensor provided in each air-conditioned space and the set temperature set as the target temperature in the air-conditioned space, A third operation unit that calculates an air supply temperature to the air-conditioned space, and the control unit includes an air supply temperature of the conditioned air calculated based on the total dew condensation status calculated by the second operation unit; The temperature of the conditioned air may be controlled based on the supply air temperature calculated by the third calculation unit.

  In addition, another air conditioning control device according to the present invention is an air conditioning device that is respectively disposed on the back of the ceiling of a plurality of air-conditioned spaces, and is conditioned air that has been heat-treated by an external air conditioner having a dehumidifying function. An air conditioning control system for controlling a dew point temperature of conditioned air supplied via a duct to an air conditioner including a duct supplied to a space and a heat exchanger supplied with a heat-treated refrigerant. The dew point temperature of the air-conditioned space measured by the first sensor provided in each of the spaces, the temperature of the refrigerant supplied to the heat exchanger measured by the second sensor, and the surface of the heat exchanger Based on one of the temperatures, a first calculation unit that calculates a dew condensation status indicating the possibility of dew condensation in the heat exchanger for each air conditioner, and a plurality of numbers calculated by the first calculation unit Condensation A second calculation unit that calculates a total dew condensation status indicating the possibility of dew condensation occurring in any of the heat exchangers of the plurality of air conditioners based on the status, and a total dew condensation status calculated by the second calculation unit And a control unit for controlling the dew point temperature of the conditioned air.

Further, in the air conditioning control device, the control unit is configured to control the amount of conditioned air from the external air conditioner based on the total dew condensation status calculated by the second calculation unit and the dew point temperature of the outside air measured by the fourth sensor. You may make it have an air volume control part which controls.

  The air-conditioning control method according to the present invention is an air-conditioning device disposed on each of the ceilings of a plurality of air-conditioned spaces, and a duct that supplies conditioned air heat-treated by an external air conditioner to the air-conditioned space; An air conditioning control method for controlling a supply temperature of conditioned air supplied via a duct to an air conditioner including a heat exchanger to which heat-treated refrigerant is supplied, and is provided in each of the air-conditioned spaces One of the dew point temperature of the air-conditioned space measured by the first sensor and the temperature of the refrigerant supplied to the heat exchanger and the temperature of the surface of the heat exchanger measured by the second sensor Based on the above, based on the first calculation step for calculating the condensation status indicating the possibility of condensation on the heat exchanger for each air conditioner, and on the plurality of condensation statuses calculated by the first calculation step , Based on the second calculation step for calculating the total condensation status indicating the possibility of the occurrence of condensation in any of the heat exchangers of the number of air conditioners, and the total condensation status calculated by the second calculation step, And a control step for controlling the supply temperature of the conditioned air supplied from the external air conditioner.

  According to the present invention, by controlling the temperature of the supply air based on the total dew condensation status, the temperature of the supply air can be controlled without causing condensation in the radiant cooling and heating device. As a result, energy saving can be realized. Can do.

FIG. 1 is a diagram schematically showing a configuration of an air-conditioning system according to the first embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of the DDCs 20a to 20c in FIG. FIG. 3 is a diagram for explaining an example of the dew condensation status. FIG. 4 is a block diagram showing the configuration of the DDC 21 in FIG. FIG. 5 is a diagram for explaining an example of the total dew condensation status. FIG. 6 is a diagram for explaining another example of the dew condensation status. FIG. 7 is a diagram for explaining another example of the dew condensation status. FIG. 8 is a diagram schematically showing the configuration of the air-conditioning system according to the second embodiment of the present invention. FIG. 9 is a block diagram showing the configuration of the DDCs 20-1a to 20-1c in FIG. FIG. 10 is a block diagram showing the configuration of the DDC 21-1 in FIG. FIG. 11 is a diagram schematically showing a configuration of an air-conditioning system according to the third embodiment of the present invention. 12 is a block diagram showing the configuration of the DDC 21-2 in FIG. FIG. 13 is a diagram schematically showing a configuration of an air-conditioning system according to the fourth embodiment of the present invention. FIG. 14 is a block diagram showing the configuration of the DDC 21-3 in FIG. FIG. 15 is a schematic diagram showing the configuration of a chilled beam. FIG. 16 is a diagram illustrating a configuration of an entire conventional air conditioning system to which a chilled beam is applied.

[First Embodiment]
First, a first embodiment of the present invention will be described.

As shown in FIG. 1, the air-conditioning system 1 according to this embodiment includes chilled beams 12a to 12c disposed on the ceilings of air-conditioned spaces 11a to 11c, and outside air to these chilled beams 12a to 12c. And an external air conditioner 13 for supplying heat-treated conditioned air and heat-treated refrigerant (cold / warm water). A refrigerant pipe 14 provided between the external air conditioner 13 and the heat exchangers 121a to 121c of the chilled beams 12a to 12c has a valve for adjusting the amount of refrigerant supplied to the heat exchangers 121a to 121c. 14a-14c are provided. Further, a duct 15 connecting the external air conditioner 13 and the chilled beams 12a to 12c has a variable air volume unit 15a for adjusting the amount of conditioned air supplied to the air-conditioned spaces 11a to 11c via the chilled beams 12a to 12c. To 15c are provided. The external air conditioner 13 is provided with valves 16a and 16b that adjust the amount of refrigerant introduced into the external air conditioner 13 from a heat source device (not shown).
On the other hand, indoor sensors 17a to 17c that measure the indoor temperature and the indoor dew point temperature in the air-conditioned space are arranged in the air-conditioned spaces 11a to 11c. The refrigerant pipe 14 is provided with a water supply temperature sensor 18 for measuring the temperature of the refrigerant supplied to the chilled beams 12a to 12c from the external air conditioner 13 (hereinafter referred to as “water supply temperature”). The duct 15 includes an air supply sensor 19 that measures the temperature of the conditioned air supplied from the external air conditioner 13 (hereinafter referred to as “supply air temperature”).
As a control device for controlling such an air conditioning system 1, direct counting controllers (DDC: Direct Digital Controller) 20 a to 20 c that control the opening degree of the valves 14 a to 14 c based on the measurement results of the indoor sensors 17 a to 17 c; , The indoor sensors 17a to 17c, the water supply temperature sensor 18, the air supply sensor 19, and the DDC 21 that controls the operation of the external air conditioner 13 and the openings of the valves 16a and 16b based on various information acquired from the DDCs 20a to 20c. Yes.
In FIG. 1, the same subscripts a to c are attached to the components associated with the same air-conditioned spaces 11a to 11c.

Here, the chilled beams 12a to 12c have the same configuration as the chilled beam 300 described with reference to FIG. 15 in the background art section, and include heat exchangers 121a to 121c and ducts 122a to 122c. Yes. In such chilled beams 12a-12c, the heat-treated refrigerant from the external air conditioner 13 is supplied to the heat exchangers 121a-121c, and the conditioned air heat-treated from the external air conditioner 13 is supplied to the ducts 122a-122c . Is done.

The external air conditioner 13 includes a heating coil 131 that heats outside air with hot water HW supplied from a heat source device such as a boiler, a cooling coil 132 that cools outside air with cold water CW supplied from a heat source device such as a cooling tower, And a fan 133 that sends out outside air (conditioned air) that has been heat-treated by the coil 131 or the cooling coil 132. Here, the refrigerant | coolant which consists of the hot water HW and the cold water CW which passed the heating coil 131 or the cooling coil 132 is supplied to the heat exchangers 121a-121c of the chilled beams 12a-12c, and circulates. The conditioned air sent out by the fan 133 is supplied to the ducts 122a to 122c of the chilled beams 12a to 12c.

  The valves 14a to 14c are provided in the refrigerant pipe 14 that connects the chilled beams 12a to 12c corresponding to the external air conditioner 13, and the amount of the refrigerant flowing into the heat exchangers 121a to 121c of the chilled beams 12a to 12c is determined. It consists of a known flow control valve that controls. Such valves 14a to 14c are driven based on control signals from the corresponding DDCs 20a to 20c to change the opening degree.

The variable air volume units 15a to 15c are provided in the duct 15 connecting the external air conditioner 13 and the corresponding chilled beams 12a to 12c, and control the amount of conditioned air flowing into the ducts 122a to 122c of the chilled beams 12a to 12c. It comprises a known flow control valve.

  The valves 16a and 16b are configured by known flow rate control valves that are driven based on a control signal from the DDC 21 and whose opening degree is adjusted. Here, the valve 16 a is disposed in a pipe connecting the heating device such as a boiler and the external air conditioner 13, and controls the amount of hot water HW supplied to the heating coil 131 of the external air conditioner 13. On the other hand, the valve 16 b is disposed in a pipe connecting the heating device such as a cooling tower and the external air conditioner 13, and controls the amount of cold water CW supplied to the cooling coil 132 of the external air conditioner 13.

  Indoor sensor 17a-17c is arrange | positioned in corresponding air-conditioned space 11a-11c, and is comprised from the well-known temperature sensor and dew point temperature sensor which measure internal indoor temperature and indoor dew point temperature. This measurement result is transmitted to the corresponding DDCs 20a to 20c.

  The water supply temperature sensor 18 includes a known temperature sensor that measures the temperature of the refrigerant flowing in the refrigerant pipe 14. This measurement result is transmitted to each DDC 20a-20c.

  The air supply sensor 19 includes a known temperature sensor that measures the temperature of the conditioned air flowing through the duct 15. This measurement result is transmitted to the DDC 21.

  The DDCs 20a to 20c are provided for the corresponding chilled beams 12a to 12c, and are composed of a computer having an arithmetic device such as a CPU, a recording device such as a memory and a hard disk, and a program installed in the computer. . That is, the hardware resource and the software cooperate to control the hardware resource by a program, and as shown in FIG. 2, the I / F unit 201, the comparison unit 202, the dew condensation status calculation unit 203, and the storage unit 204 is realized. For the sake of convenience, in the following description, the configuration of the DDC 20a will be described as an example. However, since the DDCs 20b and 20c have the same configuration as the DDC 20a, the description thereof is omitted.

  The I / F unit 201 is electrically connected to the valve 14a, the indoor sensor 17a, the water supply temperature sensor 18, and the DDC 21. The I / F unit 201 exchanges various information with these, and transmits the various information as necessary. The data is sent to the drive unit 202, the comparison unit 202, and the dew condensation status calculation unit 203. The I / F unit 201 is also electrically connected to a remote controller or an operation panel provided in the air-conditioned spaces 11a to 11c, and the air-conditioned spaces 11a to 11c are set based on operation inputs from the user or the like. The temperature is entered.

  The comparison unit 202 compares the dew point temperature of the air-conditioned space 11a measured by the indoor sensor 17a with the water supply temperature measured by the water supply temperature sensor 18, and calculates a difference between them.

  The dew condensation status calculation unit 203 functions as a first calculation unit, and calculates the dew condensation status of the chilled beam 12a based on the comparison result by the comparison unit 202. This dew condensation status is an index indicating the possibility of dew condensation occurring in the heat exchanger 121a of the chilled beam 12a. In the present embodiment, three dew condensation statuses are calculated: “Danger” where condensation is likely to occur, “Caution” where condensation is likely to occur, and “Dry” where condensation is unlikely to occur. To set. These dew condensation statuses are calculated based on the threshold values stored in the storage unit 204. The calculated dew condensation status is sent to the DDC 21 via the I / F unit 201.

The storage unit 204 functions as a first storage unit, and stores in advance a threshold used by the condensation status calculation unit 203 for calculation of the condensation status. This threshold is set based on the difference between the water supply temperature and the dew point temperature. Specifically, as shown in FIG. 3, when the dew point temperature of the air-conditioned space 11 a is lower than the temperature 2 ° C. lower than the water supply temperature, the “dry” dew condensation status, water supply more than 2 ° C. lower than the water supply temperature When the temperature is below the temperature range, the "Caution" condensation status is calculated. When the temperature is higher than the water supply temperature, the "Danger" condensation status is calculated.

  The DDC 21 is provided as a host device of the DDCs 20a to 20c, and includes a computer having an arithmetic device such as a CPU, a recording device such as a memory and a hard disk, and a program installed in the computer. That is, the hardware resource and the software cooperate to control the hardware resources by a program, and as shown in FIG. 4, the I / F unit 211, the drive unit 212, the total status calculation unit 213, and the storage unit 214. And dew condensation prevention part 215 is realized.

  The I / F unit 211 is electrically connected to the external air conditioner 13, the valves 16a and 16b, the air supply sensor 19, and the DDCs 20a to 20c, and exchanges various types of information with them, as necessary. The various information is sent to the drive unit 212, the total status calculation unit 213, and the dew condensation prevention unit 215.

  The drive unit 212 controls the driving of the external air conditioner 13 and the opening degrees of the valves 16a and 16b based on information acquired from the indoor sensors 17a to 17c, the water supply temperature sensor 18, the air supply sensor 19, and the DDCs 20a to 20c. Here, the supply air temperature from the external air conditioner 13 is controlled by controlling the opening degree of the valves 16 a and 16 b based on the supply air temperature set by the dew condensation prevention unit 215.

The total status calculation unit 213 functions as a second calculation unit, and is based on the condensation status set by the condensation status calculation unit 203 of each of the DDCs 20a to 20c and the rule stored in the storage unit 214. Is calculated and set. The total dew condensation status is an index indicating the possibility of dew condensation occurring in any one of the chilled beams 12a to 12c included in the air conditioning system 1. In this embodiment, three total dew condensation statuses are calculated : “Danger” where condensation is likely to occur, “Caution” where condensation is likely to occur, and “Dry” where condensation is unlikely to occur. Is done. The calculated total condensation status is sent to the condensation prevention unit 215 .

  The storage unit 214 functions as a second storage unit and stores in advance rules used by the total status calculation unit 213 to calculate the total dew condensation status. This rule indicates the dew condensation status of each of the chilled beams 12a to 12c and the total dew condensation status calculated from these dew condensation statuses. An example is shown in FIG.

  The rules shown in FIG. 5 are set for the purpose of more reliably preventing the occurrence of condensation. Specifically, when the dew condensation status of all the chilled beams is “danger”, the total dew condensation status is set to “danger”. If the condensation status of at least one chilled beam among the plurality of chilled beams is “Danger” and the condensation status of other chilled beams is “Caution” or “Dry”, the total condensation status is set to “Danger”. . When the dew condensation status of all chilled beams is “Caution”, the total dew condensation status is set to “Caution”. Further, when the dew condensation status of at least one chilled beam among the plurality of chilled beams is “caution” and the dew condensation status of other chilled beams is “dry”, the total dew condensation status is set to “caution”. When the dew condensation status of all chilled beams is “dry”, the total dew condensation status is set to “dry”.

  Note that the rules are not limited to those shown in FIG. 5 and can be set as appropriate. For example, the total condensation status of “danger” and “caution” is not calculated so as to realize more energy saving. It can also be set. FIG. 5 shows the case where the chilled beams 12a to 12n are provided without limiting the number of chilled beams, but it goes without saying that the number of chilled beams 12a to 12n can be applied to the present embodiment by using three.

The dew condensation prevention unit 215 functions as a control unit, and controls the supply air temperature based on the total dew condensation status set by the total status calculation unit 213.

  As described above, when the sensible heat load (temperature load) or latent heat load (humidity) is large, the supply air temperature is lowered, and when the load is small, the supply air temperature is raised to reduce energy consumption. be able to. However, if the supply air temperature is raised too much, the dew point temperature of the air-conditioned spaces 11a to 11c rises and there is a risk that condensation will occur.

  Therefore, in the present embodiment, the dew condensation prevention unit 215 controls the supply air temperature based on the total dew condensation status, thereby preventing dew condensation from occurring. Specifically, when the total dew condensation status is “hazardous”, that is, when the indoor dew point temperature is equal to or higher than the water supply temperature in any of the air-conditioned spaces 11a to 11c, the supply air temperature is lowered by 2 ° C. Thus, when the supply air temperature becomes lower than the dew point temperature in the external air conditioner 13, the external air conditioner 13 dehumidifies.

In addition, when the total dew condensation status is “Caution”, that is, in any of the air-conditioned spaces 11a to 11c, the indoor dew point temperature is within a range of 2 ° C. lower than the water supply temperature and lower than the water supply temperature. Reduce temperature by 1 ° C. As a result, the humidity of the supply air supplied to the heat exchangers 121a to 121c of the chilled beams 12a to 12c is reduced, and as a result, condensation is prevented from occurring in the heat exchangers 121a to 121c of the chilled beams 12a to 12c. be able to.

Further, when the total dew condensation status is “dry”, that is, when the indoor dew point temperature is further lower than the temperature lower by 2 ° C. than the water supply temperature in all the air-conditioned spaces 11a to 11c, the supply air temperature is set to 0.5 ° C. Raise. Thus, since air supply temperature is raised, energy saving is realizable. At this time, since the water supply temperature is sufficiently higher than the indoor dew point temperature, it is possible to prevent condensation from occurring even if the supply air temperature is increased.

  As described above, according to the present embodiment, by controlling the supply air temperature based on the total dew condensation status, it is possible to supply the air without causing condensation in the heat exchangers 121a to 121c of the chilled beams 12a to 12c. Since the temperature can be controlled, energy saving can be realized as a result.

  It should be noted that a certain response time is required until the indoor dew point temperature changes after the supply air temperature is changed. That is, changing the supply air temperature requires time to wait for an effect that allows for a response time. Therefore, the dew condensation prevention unit 215 can more effectively prevent condensation and save energy by performing the determination of the supply air temperature change in the period of time waiting for the effect.

In this embodiment, the case where the condensation status is set digitally as shown in FIG. 3 has been described as an example. However, the method for setting the condensation status is not limited to this and can be set as appropriate. . For example, as shown in FIG. 6, it may be set in an analog manner. In FIG. 6, the dew condensation status is expressed as a numerical value. The indoor dew point temperature is 0 when the temperature is 2 ° C. lower than the water supply temperature, 100 when the water temperature is higher than the water supply temperature, As the room dew point temperature increases, the dew condensation status also increases. The maximum value among the dew condensation statuses of the chilled beams 12a to 12c set in this way is set as the total dew condensation status. The supply air temperature is -0.02 * total dew condensation status. Thereby, since supply air temperature can be set more finely according to the state of each air-conditioned space 11a-11c, prevention of condensation and energy saving can be realized more effectively.

Further, the dew condensation status can be set not only in an analog manner as shown in FIG. 6, but also in a multi-step analog manner as shown in FIG. In FIG. 7, the indoor dew point temperature is set to −50 when the temperature is 4 ° C. lower than the water supply temperature, and 100 is set above the water supply temperature. Further, the inclination between the temperature range from 4 ° C. to 2 ° C. lower than the water supply temperature and the range from the temperature 2 ° C. to the water supply temperature are changed. Thereby, since supply air temperature can be set still more finely according to the state of each air-conditioned space 11a-11c, prevention of condensation and energy saving can be realized more effectively.

  In the present embodiment, the case where the condensation status is set by the DDCs 20a to 20c has been described as an example. However, the condensation status may be set by the DDC 21. In this case, it can be realized by connecting the indoor sensors 17a to 17c and the water supply temperature sensor 18 to the DDC 21 and further providing a comparison unit 202 and a dew condensation status calculation unit 203 in the DDC 21.

  Further, in the present embodiment, based on the indoor temperature measured by the indoor sensors 17a to 17c and the set temperature input to the I / F unit 201, the valve 14a that controls the flow rate of the refrigerant is driven and opened. A drive unit for adjusting the degree may be further provided in the DDCs 20a to 20c. Thus, by controlling the flow rate of the refrigerant supplied to the heat exchangers of the chilled beams 12a to 12c and changing the heat transfer due to radiation and convection generated by the heat exchangers, The temperature can be changed. For example, when cold water is supplied from the external air conditioner 13 to the chilled beam 12a, if the indoor temperature of the air-conditioned space 11a is lower than the set temperature, the opening of the valve 14a is reduced, and the chilled beam 12a Reduce the amount of cold water supplied. Thereby, since heat transfer by a heat exchanger becomes small, the fall of room temperature can be prevented. On the other hand, when the indoor temperature of the air-conditioned space 11a is higher than the set temperature, the opening degree of the valve 14a is increased to increase the amount of cold water supplied to the chilled beam 12a. Thereby, since heat transfer by a heat exchanger becomes large, indoor temperature can be reduced.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
In the present embodiment, the supply air temperature is controlled in consideration of the air conditioning load of the air-conditioned space in addition to the above-described condensation status and total condensation status.
Furthermore, in this embodiment, the air conditioning load of each air-conditioned space, that is, the “room temperature status” for evaluating the difference between the room temperature of each air-conditioned space and the set temperature set as the target temperature for each air-conditioned space. Based on this, the supply temperature of the conditioned air is calculated. In the following description, a room temperature status or a total room temperature status to be described later is further set in DDCs 20a to 20c and DDC 21 in the first embodiment described above. Therefore, in the present embodiment, the same components as those in the first embodiment are denoted by the same names and reference numerals, and the description thereof is omitted as appropriate.

As shown in FIG. 8, the air conditioning system 2 according to the present embodiment has chilled beams 12a to 12c arranged on the back of the ceiling of the air-conditioned spaces 11a to 11c, and outside air to these chilled beams 12a to 12c. And an external air conditioner 13 for supplying heat-treated conditioned air and heat-treated refrigerant (cold / warm water). A refrigerant pipe 14 provided between the external air conditioner 13 and the heat exchangers 121a to 121c of the chilled beams 12a to 12c has a valve for adjusting the amount of refrigerant supplied to the heat exchangers 121a to 121c. 14a-14c are provided. Further, a duct 15 connecting the external air conditioner 13 and the chilled beams 12a to 12c has a variable air volume unit 15a for adjusting the amount of conditioned air supplied to the air-conditioned spaces 11a to 11c via the chilled beams 12a to 12c. To 15c are provided. The external air conditioner 13 is provided with valves 16a and 16b for adjusting the amount of refrigerant introduced from the heat source device into the external air conditioner 13.
On the other hand, indoor sensors 17a to 17c that measure the indoor temperature and the indoor dew point temperature in the air-conditioned space are arranged in the air-conditioned spaces 11a to 11c. The refrigerant pipe 14 is provided with a water supply temperature sensor 18 for measuring the water supply temperature of the refrigerant supplied from the external air conditioner 13 to the chilled beams 12a to 12c. Further, the duct 15 is provided with an air supply sensor 19 that measures the supply air temperature of the conditioned air supplied from the external air conditioner 13.
As a control device for controlling such an air conditioning system 2, DDCs 20-1a to 20-1c for controlling the openings of the valves 14a to 14c based on the measurement results of the indoor sensors 17a to 17c, and indoor sensors 17a to 17c, A water supply temperature sensor 18, an air supply sensor 19, and a DDC 21-1 that controls the operation of the external air compressor 13 and the opening degree of the valves 16a and 16b based on various information acquired from the DDCs 20-1a to 20-1c. Yes.
In FIG. 8, the same subscripts a to c are attached to the components associated with the same air-conditioned spaces 11a to 11c.

  Here, the DDCs 20-1a to 20-1c are provided for the corresponding chilled beams 12a to 12c, and a computer including an arithmetic device such as a CPU, a recording device such as a memory and a hard disk, and the like are included in the computer. It consists of installed programs. That is, the hardware resource and the software cooperate to control the hardware resources by a program. As shown in FIG. 9, the I / F unit 201, the comparison unit 202-1, the dew condensation status calculation unit 203, A storage unit 204-1 and a room temperature status calculation unit 205 are realized.

  The comparison unit 202-1 compares the dew point temperature of the corresponding air-conditioned spaces 11a to 11c measured by the indoor sensors 17a to 17c with the water supply temperature measured by the water supply temperature sensor 18, and calculates the difference therebetween. . Moreover, the comparison part 202-1 compares the indoor temperature and dew point temperature of the corresponding air-conditioned spaces 11a to 11c measured by the indoor sensors 17a to 17c, and the set temperatures of the air-conditioned spaces 11a to 11c. The difference is calculated.

  The dew condensation status calculation unit 203 sets the dew condensation status of the corresponding chilled beams 12a to 12c based on the comparison result between the dew point temperature and the water supply temperature by the comparison unit 202-1. This condensation status is equivalent to the condensation status in the first embodiment described above.

The storage unit 204-1 stores in advance threshold values used by the dew condensation status calculation unit 203 described in the first embodiment to calculate the dew condensation status. The storage unit 204-1 also stores in advance a threshold value that the room temperature status calculation unit 205 uses to calculate the room temperature status. Details of this threshold will be described later.

  The room temperature status calculation unit 205 functions as a third calculation unit, and calculates the room temperature status of the corresponding air-conditioned spaces 11a to 11c based on the comparison result between the room temperature and the set temperature by the comparison unit 202-1. The calculated room temperature status is sent to the DDC 21-1 via the I / F unit 201.

  Here, the room temperature status is an index indicating the temperature state of the corresponding air-conditioned spaces 11a to 11c. In the present embodiment, for example, in the case of cooling operation, the room temperature is lower than the set temperature and the cooling capacity is higher than the air conditioning load, “excess”, the room temperature is equal to the set temperature, and the balance between the cooling capacity and the air conditioning load is Three room temperature statuses are set: “appropriate” and “insufficient” that the room temperature is higher than the set temperature and the cooling capacity is lower than the air conditioning load. These room temperature statuses are set based on threshold values stored in the storage unit 204-1. This threshold is set based on the difference between the room temperature and the set temperature. For example, when the valve 14a is fully opened, the chilled beam 12a regards the room temperature status as “insufficient”. Further, when the valve 14a is “fully open” or “low opening”, the chilled beam 12a regards the room temperature status as “excess”.

  The DDC 21-1 is provided as a host device of the DDCs 20-1a to 20-1c. The DDC 21-1 includes a computer having an arithmetic device such as a CPU, a recording device such as a memory and a hard disk, and a program installed in the computer. Composed. That is, the hardware resource and the software cooperate to control the hardware resources by a program. As shown in FIG. 10, the I / F unit 211, the drive unit 212, the total status calculation unit 213-1, the storage The unit 214-1 and the dew condensation prevention unit 215-1 are realized.

The total status calculation unit 213-1 displays the total condensation status based on the condensation status set by the condensation status calculation unit 203 of each of the DDCs 20-1a to 20-1c and the rules stored in the storage unit 214-1. Calculate and set. This total dew condensation status is equivalent to the total dew condensation status in the first embodiment described above.
In addition, the total status calculation unit 213-1 calculates the total room temperature based on the room temperature status set by the room temperature status calculation unit 205 of each of the DDCs 20-1a to 20-1c and the rules stored in the storage unit 214-1. Calculate and set the status.

Here, the total room temperature status is an index indicating the state of the room temperature of the air-conditioned spaces 11a to 11c included in the air conditioning system 2 . In the present embodiment, in the case of cooling, the room temperature of the air-conditioned spaces 11a to 11c is “excess” where the room temperature is lower than the set temperature and the cooling capacity is higher than the air-conditioning load, and the room temperature of the air-conditioned spaces 11a to 11c is the set temperature. There are three totals: “appropriate” in which the cooling capacity and the air conditioning load are balanced, and “insufficient” in which the room temperature of the air-conditioned spaces 11a to 11c is higher than the set temperature and the cooling capacity is lower than the air conditioning load. Room temperature status is set.

The storage unit 214-1 stores in advance the rules used by the total status calculation unit 213-1 for calculating the total dew condensation status. This rule is equivalent to the rule in the first embodiment described above. The storage unit 214-1 also stores in advance rules used by the total status calculation unit 213-1 for calculating the total room temperature status. In the present embodiment, the rule is that the most room temperature status is the total room temperature status. For example, if even one of the room temperature statuses is “insufficient”, the total room temperature status is set to “insufficient”, the air supply temperature is lowered by 1 ° C. for cooling, and the air supply temperature is raised by 1 ° C. for heating. When all the room temperature statuses are “excess”, the total room temperature status is made excessive, the supply air temperature is raised by 1 ° C. for cooling, and the supply air temperature is lowered by 1 ° C. for heating.

  The dew condensation prevention unit 215-1 sets the supply air temperature based on the total dew condensation status and the total room temperature status set by the total status calculation unit 213-1. Details are shown below.

  First, the dew condensation prevention unit 215-1 calculates the difference between the supply air temperature based on the total dew condensation status, more specifically, the current supply air temperature. In the present embodiment, as an example, in the cooling operation, when the total dew condensation status is “danger”, the supply air temperature is lowered by 2 ° C. from the current temperature. When the total dew condensation status is “Caution”, the supply air temperature is lowered by 1 ° C. from the current temperature. When the total dew condensation status is “dry”, the supply air temperature is raised by 0.5 ° C. from the current temperature.

  In addition, the dew condensation prevention unit 215-1 calculates the difference in supply air temperature based on the total room temperature status. In the present embodiment, as an example, in the case of cooling operation, when the total room temperature status is “excess”, the difference between the supply air temperatures is set to a predetermined value (for example, 0.5 ° C.), and the current supply air temperature is Increase only the value. When the total room temperature status is “insufficient”, the difference value is set to a predetermined value (for example, −1 ° C.), and the supply air temperature is lowered from the current temperature by that value. When the total room temperature status is “proper”, the difference is set to ± 0 ° C., and the supply air temperature is not changed.

When the difference between the supply air temperatures based on the total dew condensation status and the difference between the supply air temperatures based on the total room temperature status are calculated, the dew condensation prevention unit 215-1 adds the values of these two differences, Check whether the result is within a predetermined range. For example, when a value obtained by adding two difference values is within a predetermined range such as within ± 2 ° C., the value is added to the current temperature and set as a new supply air temperature, while the value is For example, if it exceeds + 2 ° C., it is set to + 2 ° C., and if it exceeds −2 ° C., it is set to −2 ° C., and is set as a new supply air temperature in addition to the current supply air temperature. In this way, the “upper and lower limit processing” for suppressing the difference in the supply air temperature between the predetermined upper limit value and the lower limit value is performed when the air conditioning system controls the supply air temperature if the change range of the supply air temperature is too large. It is because there is a possibility that it cannot respond to the change of The upper limit value and the lower limit value may be determined based on the air conditioning load of the controlled space, the capacity of the external air conditioner, and the like.
A new supply air temperature is set from the difference after performing such upper and lower limit processing and the current supply air temperature.

In the above description, the upper and lower limit processing is described by adding the difference between the supply air temperatures calculated based on the total dew condensation status and the difference between the supply air temperatures calculated based on the total room temperature status. However, instead of adding the two differences, the two may be compared and a small value may be adopted.
In humid seasons, etc., the room temperature may be adequate but there may be condensation. In such a case, in the present embodiment, the supply air temperature decreases in accordance with the total dew condensation status, so that the occurrence of dew condensation can be prevented.

As described above, according to the present embodiment, by setting the total room temperature status together with the total condensation status, it is possible to more effectively prevent the occurrence of condensation.
In the present embodiment, the supply air temperature is obtained through the room temperature status and the total room temperature status based on the room temperature of the air-conditioned space and the set temperature set as the target temperature for the air-conditioned space. However, in the present invention, this may be obtained by other control methods such as proportional control (P control), proportional-integral control (PI control), and proportional-integral-derivative control (PID control).

[Third Embodiment]
Next, a third embodiment of the present invention will be described. In addition, this Embodiment utilizes the dehumidification function of the external air handler 13 in 2nd Embodiment mentioned above. Therefore, in the present embodiment, the same components as those in the second embodiment are denoted by the same names and reference numerals, and the description thereof is omitted as appropriate.

As shown in FIG. 11, the air-conditioning system 3 according to this embodiment has chilled beams 12a to 12c disposed on the backs of the ceilings of air-conditioned spaces 11a to 11c, and outside air to these chilled beams 12a to 12c. An external air conditioner 13-1 that supplies heat-treated conditioned air and heat-treated refrigerant (cold / warm water). In the refrigerant pipe 14 provided between the external air conditioner 13-1 and the heat exchangers 121a to 121c of the chilled beams 12a to 12c, the amount of refrigerant supplied to the heat exchangers 121a to 121c is adjusted. Valves 14a to 14c are provided. Further, a duct 15 connecting the external air conditioner 13 and the chilled beams 12a to 12c has a variable air volume unit 15a for adjusting the amount of conditioned air supplied to the air-conditioned spaces 11a to 11c via the chilled beams 12a to 12c. To 15c are provided. The external air conditioner 13-1 is provided with valves 16a and 16b that adjust the amount of refrigerant introduced from the heat source device into the external air conditioner 13-1.
On the other hand, indoor sensors 17a to 17c that measure the indoor temperature and the indoor dew point temperature in the air-conditioned space are arranged in the air-conditioned spaces 11a to 11c. The refrigerant pipe 14 is provided with a water supply temperature sensor 18 for measuring the water supply temperature of the refrigerant supplied from the external air conditioner 13-1 to the chilled beams 12a to 12c. The duct 15 includes an air supply sensor 19 that measures the supply temperature of the conditioned air supplied from the external air conditioner 13-1, and a dew point temperature of the air supply from the external air conditioner 13-1. An air supply dew point temperature sensor 30 for measuring “air dew point temperature” is provided.
As control devices for controlling such an air conditioning system 3, DDCs 20-1a to 20-1c for controlling the openings of the valves 14a to 14c based on the measurement results of the indoor sensors 17a to 17c, and indoor sensors 17a to 17c, Based on various information acquired from the water supply temperature sensor 18, the air supply sensor 19, the DDCs 20-1a to 20-1c, and the air supply dew point temperature sensor 30, the operation of the external air conditioner 13-1 and the opening degrees of the valves 16a and 16b are determined. DDC 21-2 to be controlled.
Also in FIG. 11, the same subscripts a to c are attached to the components associated with the same air-conditioned spaces 11a to 11c.

  The external air conditioner 13-1 includes a heating coil 131 that heats the outside air with hot water HW supplied from the heat source device, a cooling coil 132 that cools the outside air with cold water CW supplied from the heat source device, and the heating coil 131 or the cooling coil. And a fan 133 that sends out the outside air (supply air) that has been heat-treated by 132. Here, the external air conditioner 13-1 has a function of performing dehumidification with these components. In addition, you may make it provide the apparatus for exclusive use of dehumidifications, such as cooling reheating and a desiccant, in the external conditioner 13-1.

  The DDC 21-2 is provided as a higher-level device of the DDCs 20-1a to 20-1c. The DDC 21-2 includes a computer having an arithmetic device such as a CPU, a recording device such as a memory and a hard disk, and a program installed in the computer. Composed. That is, the hardware resources and the software cooperate to control the hardware resources by a program, and as shown in FIG. 12, the I / F unit 211, the drive unit 212, the total status calculation unit 213-1, the storage The unit 214-1 and the dew condensation prevention unit 215-2 are realized.

  The dew condensation prevention unit 215-2 functions as a control unit and calculates the supply air temperature based on the total room temperature status calculated by the total status calculation unit 213-1. Further, the dew condensation prevention unit 215-2 calculates and sets the supply air dew point temperature based on the total dew condensation status calculated by the total status calculation unit 213-1.

  Regarding the supply air temperature, when the total room temperature status is “insufficient”, the supply air temperature is lowered by 1 ° C. for cooling, and the supply air temperature is raised by 1 ° C. for heating. When all the room temperature statuses are “excess”, the total room temperature status is set to “excess”, the air supply temperature is raised by 1 ° C. for cooling, and the air supply temperature is lowered by 1 ° C. for heating.

  On the other hand, regarding the supply air dew point temperature, when the total dew condensation status is “danger”, the supply air dew point temperature is lowered by 2 ° C. When the total dew condensation status is “Caution”, the supply air dew point temperature is lowered by 1 ° C. When the total dew condensation status is “dry”, the supply air dew point temperature is increased by 0.5 ° C. Such a supply air dew point temperature is measured by the supply air dew point temperature sensor 30.

  When the supply air temperature and the supply air dew point temperature are set in this way, the drive unit 212 controls the external air conditioner 13 and the like based on the set supply air temperature and supply air dew point temperature. Here, the supply air dew point temperature is controlled using the dehumidifying function of the external air conditioner 13.

  Thus, according to the present embodiment, since the supply air dew point temperature is controlled based on the total dew condensation status, the occurrence of dew condensation can be prevented more effectively.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described. In the present embodiment, an outside air dew point temperature sensor that measures the dew point temperature of the outside air is further provided in the first embodiment described above. Therefore, in the present embodiment, the same components as those in the first embodiment are denoted by the same names and reference numerals, and the description thereof is omitted as appropriate.

As shown in FIG. 13, the air conditioning system 4 according to the present embodiment has chilled beams 12a to 12c disposed on the backs of the ceilings of the air-conditioned spaces 11a to 11c, and outside air to these chilled beams 12a to 12c. And an external air conditioner 13 for supplying heat-treated conditioned air and heat-treated refrigerant (cold / warm water). A refrigerant pipe 14 provided between the external air conditioner 13 and the heat exchangers 121a to 121c of the chilled beams 12a to 12c has a valve for adjusting the amount of refrigerant supplied to the heat exchangers 121a to 121c. 14a-14c are provided. Further, a duct 15 connecting the external air conditioner 13 and the chilled beams 12a to 12c has a variable air volume unit 15a for adjusting the amount of conditioned air supplied to the air-conditioned spaces 11a to 11c via the chilled beams 12a to 12c. To 15c are provided. The external air conditioner 13 is provided with valves 16a and 16b for adjusting the amount of refrigerant introduced from the heat source device into the external air conditioner 13.
On the other hand, indoor sensors 17a to 17c that measure the indoor temperature and the indoor dew point temperature in the air-conditioned space are arranged in the air-conditioned spaces 11a to 11c. The refrigerant pipe 14 is provided with a water supply temperature sensor 18 for measuring the water supply temperature of the refrigerant supplied from the external air conditioner 13 to the chilled beams 12a to 12c. Further, the duct 15 is provided with an air supply sensor 19 that measures the supply air temperature of the conditioned air supplied from the external air conditioner 13. Further, an outside air dew point temperature sensor 40 for measuring the dew point temperature of the outside air is provided outside the air conditioning system 4.
As control devices for controlling such an air conditioning system 4, DDCs 20 a to 20 c that control the openings of the valves 14 a to 14 c based on the measurement results of the indoor sensors 17 a to 17 c, the indoor sensors 17 a to 17 c, and the water supply temperature sensor 18. The air supply sensor 19, the outside air dew point temperature sensor 40, and the DDC 21-3 that controls the operation of the external air compressor 13 and the opening degree of the valves 16a and 16b based on various information acquired from the DDCs 20a to 20c.
Also in FIG. 13, the same subscripts a to c are attached to the components associated with the same air-conditioned spaces 11a to 11c.

  The DDC 21-3 is provided as a higher-level device of the DDCs 20a to 20c, and includes a computer having an arithmetic device such as a CPU, a recording device such as a memory and a hard disk, and a program installed in the computer. That is, the hardware resource and the software cooperate to control the hardware resources by a program, and as shown in FIG. 14, the I / F unit 211, the drive unit 212, the total status calculation unit 213, and the storage unit 214. And dew condensation prevention part 215-3 is realized.

The dew condensation prevention unit 215-3 functions as a control unit, and calculates the supply air temperature based on the total dew condensation status calculated by the total status calculation unit 213. Further, the dew condensation preventing unit 215-3 has a total dew condensation status of “danger” or “caution”, and the dew point temperature of the outside air measured by the outside air dew point temperature sensor 40 is measured by the indoor sensors 17a to 17c. When the temperature is higher than any of the indoor dew point temperatures of the air-conditioned spaces 11a to 11c, the rotational speed of the fan 133 of the external air conditioner 13 is increased.

  When the supply air temperature and the rotation speed of the fan 133 are set in this way, the drive unit 212 controls the external air conditioner 13 and the like based on the set supply air temperature and rotation speed.

  If the chilled beams 12a to 12c are highly likely to condense from the total dew condensation status and the outdoor dew point temperature is high, that is, the humidity is high, condensation may occur if the outside air flows directly into the air-conditioned spaces 11a to 11c. There is. As an inflow path of the outside air to the air-conditioned spaces 11a to 11c, a draft or opening / closing of a door / window is assumed. Therefore, in order to prevent such inflow of outside air, the rotational speed of the fan 133 is increased, and the air volume of the supply air is increased. Thereby, the air pressure in the air-conditioned spaces 11a to 11c is increased from the atmospheric pressure, and the air inside the air-conditioned spaces 11a to 11c flows out to the outside, so that the outside air flows into the air-conditioned spaces 11a to 11c. Can be prevented.

  As described above, according to the present embodiment, it is possible to prevent outside air from flowing into the air-conditioned spaces 11a to 11c by increasing the air volume of the supply air based on the total dew condensation status. As a result, it is possible to prevent condensation from occurring.

  Needless to say, this embodiment can also be applied to the second and third embodiments described above.

  Moreover, in the 1st-4th embodiment mentioned above, the dew point temperature of air-conditioned space 11a-11c and the water supply temperature measured by the water supply temperature sensor 18 are compared, and a dew condensation status is calculated from these differences. Although the case has been described as an example, the surface temperatures of the heat exchangers 121a to 121c may be used instead of the water supply temperature. The surface temperature can be measured by a temperature sensor attached to the surfaces of the heat exchangers 121a to 121c. Even if it does in this way, the effect equivalent to the 1st-4th embodiment mentioned above is realizable.

  The present invention can be applied to an air conditioning system provided in a building including a plurality of rooms such as a house or a building.

DESCRIPTION OF SYMBOLS 1-3 ... Air conditioning system, 11a-11c ... Space to be conditioned, 12a-12n ... Chilled beam, 13, 13-1 ... External conditioner, 14 ... Refrigerant piping, 14a-14c ... Valve, 15 ... Duct, 15a -15c ... Variable air flow unit, 16a, 16b ... Valve, 17a-17c ... Indoor sensor, 18 ... Water supply temperature sensor, 19 ... Air supply sensor, 20a-20c, 20-1a-20-1c ... DDC, 21, 21- DESCRIPTION OF SYMBOLS 1-21 ... DDC, 30 ... Supply air dew point temperature sensor, 40 ... Outside air dew point temperature sensor, 121a-121c ... Heat exchanger, 122a-122c ... Duct, 131 ... Heating coil, 132 ... Cooling coil, 133 ... Fan , 201 ... I / F section, 202 ... comparing unit, 203 ... condensation status calculation unit, 204 ... storage unit, 211 ... I / F section, 212 ... driving section, 213,213- ... Total Status calculation unit, 214,214-1 ... storage unit, 215,215-1～3 ... dew condensation preventing unit, 300 ... chilled beam, 301 ... heat exchanger, 302 ... ducts 303 ... housing.

Claims (6)

A heat exchanger that is arranged on the back of the ceiling of a plurality of air-conditioned spaces, and that supplies conditioned air that has been heat-treated by an external air conditioner to the air-conditioned space, and heat exchange that is supplied with heat-treated refrigerant An air conditioning control device for controlling an air supply temperature of the conditioned air supplied through the duct to an air conditioning device comprising
The dew point of the air-conditioned space measured by the first sensor provided in each of the air-conditioned spaces, the temperature of the refrigerant and the heat supplied to the heat exchanger measured by the second sensor A first computing unit that computes a dew condensation status for each of the air conditioners indicating the possibility of dew condensation occurring in the heat exchanger based on one of the temperatures on the surface of the exchanger;
Based on a plurality of the dew condensation statuses calculated by the first calculation unit, a second dew state calculating a total dew condensation status indicating a possibility of dew condensation occurring in any of the heat exchangers of the plurality of air conditioners. An arithmetic unit;
An air-conditioning control apparatus comprising: a control unit that controls a supply temperature of the conditioned air supplied from the external air compressor based on the total dew condensation status calculated by the second calculation unit. . A first storage unit storing a relationship between a difference between the dew point temperature measured by the first sensor and the temperature measured by the second sensor and the dew condensation status;
A second storage unit storing a relationship between the combination of the dew condensation status calculated for each of the air conditioners and the total dew condensation status;
A third storage unit storing a relationship between the total dew condensation status and a control amount of the supply air temperature of the conditioned air;
The first calculation unit is based on the dew point temperature measured by the first sensor and the temperature measured by the second sensor, and the relationship stored in the first storage unit. Calculate the condensation status,
The second calculation unit calculates the total dew condensation status based on the dew condensation status for each of the air conditioners calculated by the first calculation unit and the relationship stored in the second storage unit,
The control unit determines the supply temperature of the conditioned air based on the total condensation status, the relationship stored in the third storage unit, and the current supply temperature of the conditioned air. The air conditioning control device according to claim 1. Based on the room temperature of the air-conditioned space measured by the third sensor provided in each of the air-conditioned spaces and the set temperature set as the target temperature in the air-conditioned space, A third calculation unit for calculating the air temperature;
The control unit is based on the supply air temperature of the conditioned air calculated based on the total dew condensation status calculated by the second calculation unit and the supply air temperature calculated by the third calculation unit. The air conditioning control device according to claim 1, wherein the temperature of the conditioned air is controlled. An air conditioner disposed on each of the ceilings of a plurality of air-conditioned spaces, wherein a duct for supplying conditioned air heat-treated by an external air conditioner having a dehumidifying function to the air-conditioned space, and a heat-treated refrigerant are supplied An air conditioning control system for controlling a dew point temperature of the conditioned air supplied through the duct to an air conditioning apparatus including a heat exchanger,
The dew point of the air-conditioned space measured by the first sensor provided in each of the air-conditioned spaces, the temperature of the refrigerant and the heat supplied to the heat exchanger measured by the second sensor A first calculation unit that calculates a dew condensation status for each of the air conditioners indicating the possibility of dew condensation occurring in the heat exchanger based on one of the temperatures on the surface of the exchanger;
Based on a plurality of the dew condensation statuses calculated by the first calculation unit, a second dew state calculating a total dew condensation status indicating a possibility of dew condensation occurring in any of the heat exchangers of the plurality of air conditioners. An arithmetic unit;
An air conditioning control device comprising: a control unit that controls a dew point temperature of the conditioned air based on the total dew condensation status calculated by the second calculation unit. The control unit controls the air volume of the conditioned air from the external air conditioner based on the total dew condensation status calculated by the second arithmetic unit and the dew point temperature of the outside air measured by the fourth sensor. It has a control part. An air-conditioning control device given in any 1 paragraph of Claims 1 thru / or 4 characterized by things. A heat exchanger that is arranged on the back of the ceiling of a plurality of air-conditioned spaces, and that supplies conditioned air that has been heat-treated by an external air conditioner to the air-conditioned space, and heat exchange that is supplied with heat-treated refrigerant An air conditioning control method for controlling an air supply temperature of the conditioned air supplied through the duct to an air conditioner equipped with a vessel,
The dew point of the air-conditioned space measured by the first sensor provided in each of the air-conditioned spaces, the temperature of the refrigerant and the heat supplied to the heat exchanger measured by the second sensor A first calculation step for calculating, for each air conditioner, a dew condensation status indicating the possibility of dew condensation occurring on the heat exchanger based on one of the surface temperatures of the exchanger;
Based on the plurality of dew condensation statuses calculated in the first calculation step, a second total dew condensation status indicating the possibility of dew condensation occurring in any of the heat exchangers of the plurality of air conditioners is calculated. A computation step;
And a control step of controlling a supply temperature of the conditioned air supplied from the external air conditioner based on the total dew condensation status calculated by the second calculation step.

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