WO2023058158A1

WO2023058158A1 - Air conditioning system

Info

Publication number: WO2023058158A1
Application number: PCT/JP2021/037000
Authority: WO
Inventors: 英次根本
Original assignee: 三菱電機ビルソリューションズ株式会社
Priority date: 2021-10-06
Filing date: 2021-10-06
Publication date: 2023-04-13
Also published as: CN118043600A; JPWO2023058158A1; JP7415092B2

Abstract

An air conditioner (10) includes a heat exchanger (32) for cooling and a heat exchanger (3) for heating. During cooling operation, a controller (20) adjusts the amount of heat medium supplied to the heat exchanger (32) for cooling according to a first deviation between the cooling set temperature and the room temperature. During heating operation, the controller adjusts the amount of heat medium supplied to the heat exchanger (36) for heating according to a second deviation between the heating set temperature and the room temperature. When performing cooling operation during a heating-main period in which air conditioning is performed mainly in heating operation, the controller (20) reduces the amount of heat medium supplied to the heat exchanger (32) for cooling below the amount of heat medium supplied according to the first deviation. When performing heating operation during a cooling-main period in which air conditioning is performed mainly in cooling operation, the controller (20) reduces the amount of heat medium supplied to the heat exchanger (36) for heating below the amount of heat medium supplied according to the second deviation.

Description

air conditioning system

The present disclosure relates to air conditioning systems.

Japanese Patent Laying-Open No. 2004-125288 (Patent Document 1) discloses an air conditioning system that air-conditions a controlled area. A fan, a cooling coil, and a heating coil are arranged inside the air conditioner. The controller is connected to pyranometers and thermometers on the exterior walls of the building. The controller considers the amount of solar radiation measured by the pyranometer and the ambient temperature measured by the thermometer to determine the supply air temperature set point.

JP-A-2004-125288

An air conditioner having a cooling heat exchanger (cooling coil) and a heating heat exchanger (heating coil) as in Patent Document 1 can freely switch between cooling operation and heating operation. Therefore, depending on the amount of heat entering the room according to the outdoor temperature and the amount of solar radiation, and the amount of heat generated by the human body and equipment inside the room, the room temperature changes from moment to moment. By switching and executing , the indoor temperature can be maintained at the set temperature.

However, on the other hand, immediately after the cooling operation is switched to the heating operation, the heating operation is executed so as to cancel the cooling effect of the previous cooling operation, and the energy consumption of the air conditioner during the heating operation. is unnecessarily increased. To unnecessarily increase the energy consumption of an air conditioner during the cooling operation by executing the cooling operation so as to cancel out the heating effect of the immediately preceding heating operation even immediately after switching from the heating operation to the cooling operation. is concerned.

The present disclosure has been made to solve the above problems, and an object of the present disclosure is to reduce the energy consumption of an air conditioner having a cooling heat exchanger and a heating heat exchanger. To provide an air conditioning system capable of

An air conditioning system according to one aspect of the present disclosure includes an air conditioner that conditions air in a room of a building, a temperature sensor that is installed in the room and detects the room temperature, and a cooling of the air conditioner according to the room temperature. and a controller for switching between operation and heating operation. An air conditioner includes a first heat exchanger, a second heat exchanger, a first valve, a second valve, and a fan. The first heat exchanger cools the air by heat exchange between the first heat medium and the air. The second heat exchanger heats the air by heat exchange between the second heat medium and the air. The first valve is provided in the circulation path of the first heat medium and is opened during cooling operation. The second valve is provided in the circulation path of the second heat medium and is opened during heating operation. A fan forces air through the first heat exchanger and the second heat exchanger. The controller includes a cooling control and a heating control. During cooling operation, the cooling control unit controls the degree of opening of the first valve according to a first deviation between the cooling set temperature and the room temperature, thereby supplying the first heat medium to the first heat exchanger. adjust the supply of During heating operation, the heating control unit controls the degree of opening of the second valve in accordance with a second deviation between the heating set temperature and the room temperature, thereby supplying the second heat medium to the second heat exchanger. adjust the supply of The cooling control unit adjusts the supply amount of the first heat medium to the first heat exchanger to the first deviation is reduced from the supply amount of the first heat medium according to the . The heating control unit adjusts the amount of the second heat medium supplied to the second heat exchanger by the second deviation is reduced than the supply amount of the second heat medium according to .

According to the present disclosure, it is possible to provide an air conditioning system capable of reducing the energy consumption of an air conditioner having a cooling heat exchanger and a heating heat exchanger.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows schematic structure of the air conditioning system which concerns on embodiment. 4 is a block diagram showing an example of the functional configuration of a controller; FIG. 3 is a block diagram showing a configuration example of a cooling control unit shown in FIG. 2; FIG. 4 is a block diagram showing a configuration example of a correction unit shown in FIG. 3; FIG. FIG. 4 is a diagram schematically showing an example of the relationship between outside air temperature and suppression rate; It is a figure which shows typically an example of the relationship between a solar radiation amount and a suppression rate. It is a figure which shows an example of the opening degree control of the cold-water two-way valve in a cooling control part. 3 is a block diagram showing a configuration example of a heating control unit shown in FIG. 2; FIG. 9 is a block diagram showing a configuration example of a correction unit shown in FIG. 8; FIG. FIG. 4 is a diagram schematically showing an example of the relationship between outside air temperature and suppression rate; It is a figure which shows typically an example of the relationship between a solar radiation amount and a suppression rate. It is a figure which shows an example of opening degree control of the warm water two-way valve in a heating control part. 4 is a flowchart for explaining a processing procedure for controlling the opening degrees of a cold water two-way valve and a hot water two-way valve according to the present embodiment; FIG. 4 is a diagram illustrating a first operation example of the air conditioning system according to the present embodiment; FIG. 4 is a diagram illustrating a second operation example of the air conditioning system according to the present embodiment;

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.

<Configuration of air conditioning system>
First, the configuration of an air conditioning system according to an embodiment will be described with reference to FIG. The air conditioning system 100 according to the embodiment is applied to an air conditioning system for conditioning air in a room 52 inside a building 50 .

FIG. 1 is a diagram showing a schematic configuration of an air conditioning system 100 according to an embodiment. As shown in FIG. 1, the air conditioning system 100 includes an air conditioner 10,

ducts

14, 15, 16, a controller 20, a temperature/humidity sensor 22, an outside temperature sensor 24, and a solar radiation sensor 26. .

The air conditioner 10 conditions the air in the room 52 of the building 50. The air conditioner 10 can be installed above the ceiling or under the floor of the building 50, for example. The ceiling is a space formed by providing a ceiling, and the underfloor is a space formed by providing a floor surface.

The air conditioner 10 sucks in air from the suction port 11 and blows out air from the blowout port 12 . The air outlet 12 is connected by the air supply duct 14 to an air outlet 560 provided in the ceiling 56 of the room 52 . The suction port 11 is connected by a return air duct 16 to a suction port 580 provided near the floor surface 58 of the room 52 . The intake 11 is further connected to an outside air duct 15 for taking outside air into the room 52 .

In the example of FIG. 1, the air near the floor surface 58 of the room 52 is sucked into the air conditioner 10 from the suction port 11 via the suction port 580 and the return air duct 16. The air blown out from the air conditioner 10 passes through the air outlet 12 and the air supply duct 14 and is blown into the room 52 from the air outlet 560 .

The air conditioner 10 includes a filter 30, a cold water coil 32, a cold water circulation path 33, a cold water two-way valve 34, a hot water coil 36, a hot water circulation path 37, a hot water two-way valve 38, and a humidifier. 40 , a humidification supply path 41 , a two-way humidification valve 42 and a fan 44 .

A ventilation path from the suction port 11 to the blowout port 12 is formed inside the air conditioner 10 . The filter 30, the cold water coil 32, the hot water coil 36, the humidifier 40, and the fan 44 are arranged on this ventilation path in order from the upstream side in the direction of air flow. The arrangement order of the cold water coil 32, the hot water coil 36 and the humidifier 40 is not limited as long as the filter 30 is arranged most upstream of the ventilation path and the fan 44 is arranged most downstream of the ventilation path.

The air sucked from the suction port 11 of the air conditioner 10 passes through the filter 30. Dust in the air is removed by the filter 30 . The air passing through the filter 30 passes through the cold water coil 32, the hot water coil 36 and the humidifier 40 in order.

The cold water coil 32 is supplied with a cooling heat medium (for example, cold water) from an external heat source machine (not shown) via a cold water circulation path 33 . The chilled water coil 32 is configured to cool the ventilated air by exchanging heat between the ventilated air and the heat medium.

The cold water two-way valve 34 is provided in the cold water circulation path 33 . The opening degree of the cold water two-way valve 34 is controlled by the controller 20 . The amount of heat medium supplied to the cold water coil 32 can be adjusted by controlling the degree of opening of the cold water two-way valve 34 . It is also possible to stop the supply of the heat medium to the cold water coil 32 by fully closing the cold water two-way valve 34 (opening degree = 0%). Chilled water coil 32 corresponds to an embodiment of "first heat exchanger" and chilled water two-way valve 34 corresponds to an embodiment of "first valve".

The hot water coil 36 is supplied with a heating heat medium (for example, hot water) from an external heat source machine (not shown) via a hot water circulation path 37 . The hot water coil 36 is configured to heat the ventilated air by exchanging heat between the ventilated air and the heat medium.

A hot water two-way valve 38 is provided in the hot water circulation path 37 . The degree of opening of the hot water two-way valve 38 is controlled by the controller 20 . The amount of heat medium supplied to the hot water coil 36 can be adjusted by controlling the degree of opening of the hot water two-way valve 38 . It is also possible to stop the supply of the heat medium to the hot water coil 36 by fully closing the hot water two-way valve 38 (opening degree = 0%). The hot water coil 36 corresponds to one embodiment of the "second heat exchanger" and the hot water two-way valve 38 corresponds to one embodiment of the "second valve".

The humidifier 40 is configured to humidify the ventilated air using the humidifying medium supplied through the humidifying supply path 41 . The humidification two-way valve 42 is provided in the humidification supply path 41 . The amount of humidifying medium supplied to the humidifier 40 can be adjusted by controlling the degree of opening of the humidifying two-way valve 42 . It is also possible to stop the supply of the humidifying medium to the humidifier 40 by fully closing the humidifying two-way valve 42 (opening degree = 0%).

The fan 44 sends the air that has passed through the ventilation path from the outlet 12 to the supply air duct 14 . The operation of fan 44 is controlled by controller 20 .

The temperature and humidity sensor 22 is installed inside the room 52 . The outside air temperature sensor 24 and the solar radiation sensor 26 are installed outside the building 50 (for example, on the outer wall or on the roof of the building 50). The temperature/humidity sensor 22 , the outside air temperature sensor 24 and the solar radiation sensor 26 are communicatively connected to the controller 20 .

The temperature/humidity sensor 22 detects the indoor temperature Tr and the indoor humidity Hr, and outputs a signal indicating the detected values to the controller 20 . The temperature/humidity sensor 22 is arranged, for example, in a perimeter zone on the window 54 side (or the outer wall side) of the room 52 . The number of temperature/humidity sensors 22 is not limited. For example, a plurality of temperature and humidity sensors 22 are distributed in the perimeter zone of the room 52 and the interior zone on the central side of the building 50, and the average value of the detection values of the plurality of temperature and humidity sensors 22 is obtained as the indoor temperature Tr. may be The temperature/humidity sensor 22 corresponds to an example of a "temperature sensor."

The outside air temperature sensor 24 detects the outside air temperature To of the building 50 and outputs a signal indicating the detected value to the controller 20 . The solar radiation sensor 26 detects the solar radiation Si indicating the intensity of the solar radiation irradiated to the building 50 and outputs a signal indicating the detected value to the controller 20 . The outside air temperature sensor 24 corresponds to one embodiment of "outside air temperature sensor", and the solar radiation sensor 26 corresponds to one embodiment of "solar radiation sensor".

The numbers of each of the outside air temperature sensors 24 and the solar radiation sensors 26 are not limited. For example, a configuration may be adopted in which a plurality of outside air temperature sensors 24 are arranged in a distributed manner, and the average value of the detection values of the plurality of outside air temperature sensors 24 is acquired as the outside air temperature To. Similarly, a configuration may be adopted in which a plurality of solar radiation sensors 26 are arranged in a distributed manner, and the average value of the detection values of the plurality of solar radiation sensors 26 is acquired as the solar radiation Si.

The controller 20 controls the operation of the air conditioner 10 based on output signals (detected values) from the temperature/humidity sensor 22, the outside air temperature sensor 24, and the solar radiation sensor 26. The air conditioner 10 has a cooling operation and a heating operation as operation modes. The controller 20 switches between cooling operation and heating operation according to the room temperature Tr detected by the temperature/humidity sensor 22 .

Specifically, when the indoor temperature Tr detected by the temperature/humidity sensor 22 is higher than the preset cooling set temperature Tsc (Tr>Tsc), the controller 20 selects the cooling operation. In the cooling operation, the controller 20 adjusts the amount of heat medium supplied to the cold water coil 32 by controlling the opening of the cold water two-way valve 34 so that the room temperature Tr matches the cooling set temperature Tsc, and the fan 44 is turned on. control behavior. The opening degree control of the cold water two-way valve 34 will be described later.

On the other hand, when the indoor temperature Tr detected by the temperature and humidity sensor 22 is lower than the preset heating temperature Tsh (Tr<Tsh), the controller 20 selects the heating operation. In the heating operation, the controller 20 adjusts the amount of heat medium supplied to the hot water coil 36 by controlling the opening of the hot water two-way valve 38 so that the room temperature Tr matches the heating set temperature Tsh, and the fan 44 is turned on. control behavior. The opening degree control of the hot water two-way valve 38 will be described later.

The cooling set temperature Tsc and the heating set temperature Tsh can be freely set. However, in order to avoid simultaneous execution of the cooling operation and the heating operation, it is set so as to satisfy the relationship Tsc≧Tsh. Moreover, in order to prevent hunting between the cooling operation and the heating operation, it is desirable to provide a temperature difference between the cooling set temperature Tsc and the heating set temperature Tsh.

The controller 20 controls the opening degree of the humidification two-way valve 42 so that the indoor humidity Hr detected by the temperature/humidity sensor 22 matches the predetermined set humidity Hs during the heating operation.

The controller 20 includes a CPU (Central Processing Unit), a memory, and an input/output (I/O) circuit as main components. These components can exchange data with each other via an internal bus (not shown). A program is stored in a partial area of the memory, and various processes including control of the air conditioner 10, which will be described later, can be realized by executing the program by the CPU. The I/O circuit inputs and outputs signals and data to and from the outside of controller 20 .

Alternatively, unlike the example in FIG. 1, at least part of the controller 20 can be configured using a circuit such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit). Also, at least part of the controller 20 can be configured by an analog circuit.

<Functional configuration of the controller>
Next, referring to FIG. 2, the functional configuration of the controller 20 will be described. FIG. 2 is a block diagram showing an example of the functional configuration of the controller 20. As shown in FIG. The function of each block shown in FIG. 2 can be realized by at least one of software processing and hardware processing by the controller 20 .

As shown in FIG. 2, the controller 20 includes an input section 70, a main control section 72, a cooling control section 74, a heating control section 76, a humidity control section 78, and a fan control section 80.

The input unit 70 accepts user commands for the air conditioning system 100 . The user commands include an operation ON/OFF command for the air conditioner 10, a set temperature (cooling set temperature Tsc, heating set temperature Tsh) command, and a set humidity command.

The user command further includes the setting of the cooling main period/heating main period. The “main cooling period” corresponds to a period during which the indoor temperature Tr is controlled mainly by the cooling operation of the air conditioner 10 . The “heating main period” corresponds to a period in which the room temperature Tr is controlled mainly by the heating operation of the air conditioner 10 .

The main cooling period and the main heating period can be set freely. For example, the cooling main period is set to correspond to a period in which the cooling load (heat amount to be removed for cooling) exceeds the heating load (heat amount to be heated for heating). The heating main period is set to correspond to a period in which the heating load exceeds the cooling load. As an example, the cooling main period is set to a period including summer (eg, May to October), and the heating main period is set to a period including winter (eg, November to April).

In the present embodiment, it is assumed that the user of the air conditioning system 100 manually switches between the cooling main period and the heating main period. However, the configuration may be such that the controller 20 automatically switches between the cooling main period and the heating main period according to a preset schedule.

Alternatively, the controller 20 may automatically switch between the cooling main period and the heating main period based on the temporal transition of the outside air temperature To detected by the outside air temperature sensor 24 . For example, the controller 20 obtains an average value of the maximum temperature and the minimum temperature for each day from the temporal transition of the outside air temperature To over the last several days, and switches between the cooling main period and the heating main period according to the average value.

The main control unit 72 receives user commands through the input unit 70 and also receives output signals (detection values Tr, Hr) from the temperature/humidity sensor 22 . Based on these input signals, the main control unit 72 issues control instructions to each unit in order to control the overall operation of the air conditioner 10 .

The cooling control unit 74 receives output signals (detection values Tr, To, Si) from the temperature/humidity sensor 22 , the outside air temperature sensor 24 and the solar radiation sensor 26 and also receives control commands from the main control unit 72 . The control command includes a cooling set temperature Tsc and an execution command for suppressing the amount of heat medium supplied to the chilled water coil 32, which will be described later. Based on these inputs, the cooling control unit 74 generates an opening command Vc*, which is a control amount for the opening of the cold water two-way valve 34, and sends the generated opening command Vc* to the cold water two-way valve 34. Output.

The heating control unit 76 receives output signals (detected values Tr, To, Si) from the temperature/humidity sensor 22 , the outside air temperature sensor 24 and the solar radiation sensor 26 and also receives control commands from the main control unit 72 . The control command includes a heating set temperature Tsh and an execution command for suppressing the amount of heat medium supplied to the hot water coil 36, which will be described later. Based on these inputs, the heating control unit 76 generates an opening command Vh*, which is a control amount for the opening of the hot water two-way valve 38, and sends the generated opening command Vh* to the hot water two-way valve 38. Output.

Humidity control unit 78 receives an output signal (detected value Hr) from temperature/humidity sensor 22 and a control command from main control unit 72, and generates an opening command for controlling the opening of humidification two-way valve 42. do. Humidity control unit 78 outputs the generated opening command to humidification two-way valve 42 .

The fan control unit 80 receives control commands from the main control unit 72 . The control command includes a rotation speed command for controlling the rotation speed of fan 44 . Fan control unit 80 controls the operation of fan 44 in accordance with the rotational speed command.

(Configuration of cooling control section)
Next, the functional configuration of the cooling control unit 74 will be described with reference to FIGS. 3 to 7. FIG.

FIG. 3 is a block diagram showing a configuration example of the cooling control section 74 shown in FIG. As shown in FIG. 3, the cooling control unit 74 controls the opening degree command Vc* of the cold water two-way valve 34 by feedback control for causing the room temperature Tr detected by the temperature/humidity sensor 22 to follow the cooling set temperature Tsc. configured to generate

Specifically, the cooling controller 74 includes a subtractor 740 , a controller 742 and a corrector 744 . Subtractor 740 calculates deviation ΔTc of room temperature Tr from cooling set temperature Tsc (ΔTc=Tsc−Tr). The deviation ΔTc corresponds to the "first deviation".

The controller 742 receives the deviation ΔTc calculated by the subtractor 740 and performs a control operation to set the deviation ΔTc to 0, thereby generating an opening command Vc* for the cold water two-way valve 34 . That is, the opening degree command Vc* of the cold water two-way valve 34 corresponds to the control amount for setting Tr=Tsc. A PI (proportional-integral) controller or a PID (proportional-integral-derivative) controller can be used as the controller 742 . Controller 742 corresponds to one embodiment of "first controller."

The correction unit 744 adjusts the opening degree of the cold water two-way valve 34 based on the execution command given from the main control unit 72, the outside air temperature To detected by the outside air temperature sensor 24, and the amount of solar radiation Si detected by the amount of solar radiation sensor 26. Correct command Vc*. The corrector 744 corresponds to an embodiment of the "first corrector".

Specifically, the main control unit 72 determines whether or not the current time corresponds to the main heating period based on current time information given from a clock (not shown). When the current time corresponds to the heating main period, the main control unit 72 generates an execution command for suppressing the amount of heat medium supplied to the cold water coil 32 . If the current time does not correspond to the heating main period, the main control section 72 does not generate the execution command. That is, the main control unit 72 causes the cooling control unit 74 to perform processing for suppressing the amount of heat medium supplied to the cold water coil 32 when the cooling operation is performed during the heating main period.

As described above, heating operation is the main operation during the heating main period. On the other hand, the air conditioner 10 is configured to be switchable between cooling operation and heating operation according to the room temperature Tr. The indoor temperature Tr changes from moment to moment due to the amount of heat entering the room 52 according to the outside air temperature and the amount of solar radiation, and the amount of heat generated from the human body and equipment in the room 52 . Therefore, the air conditioner 10 may temporarily perform the cooling operation when the room temperature Tr exceeds the cooling set temperature Tsc during the heating main period.

For example, if the indoor temperature Tr rises so as to follow an increase in the outdoor temperature and an increase in the amount of solar radiation, and the indoor temperature Tr exceeds the cooling set temperature Tsc for several hours after noon, the indoor temperature Tr is set to cooling. A cooling operation is temporarily performed to bring the temperature down to Tsc. After that, when the indoor temperature Tr falls below the heating set temperature Tsh so as to follow the decrease in the outside air temperature and the decrease in the amount of solar radiation, the heating operation is started.

In such a case, as the outside air temperature decreases and the amount of solar radiation decreases, the cooling of the room 52 tends to be excessive due to the synergistic effect with the cooling operation, resulting in a wasteful increase in the energy consumption of the air conditioner 10 during the cooling operation. Become.

Also, after shifting to the heating operation, the heating operation is performed so as to cancel out the cooling effect of the previous cooling operation. This is because the cooling effect of the previous cooling operation works as a heating load. That is, immediately after the transition to the heating operation, the heating operation is performed so as to replenish the amount of heat removed from the room 52 by the previous cooling operation. As a result, the energy consumption of the air conditioner 10 during the heating operation is unnecessarily increased.

In order to address the above concerns, in the present embodiment, the cooling effect is suppressed by reducing the cooling capacity of the air conditioner 10 during the heating main period, as described below.

Specifically, when the correction unit 744 receives an execution command from the main control unit 72, the correction unit 744 corrects the opening command Vc* generated by the controller 742 so as to reduce the opening command Vc*. . That is, when the cooling operation is performed during the heating main period, the correction unit 744 reduces the supply amount of the heat medium to be supplied to the cold water coil 32 from the supply amount corresponding to the deviation ΔTc. reduce the cooling capacity of the FIG. 4 is a block diagram showing a configuration example of the correction unit 744 shown in FIG.

As shown in FIG. 4, the correction unit 744 includes suppression

rate calculation units

82 and 84,

multipliers

85 and 88, and a switching unit 86.

Restriction rate calculators

82 and 84 and multiplier 85 calculate a correction coefficient for correcting opening command Vc*. Since this correction coefficient represents the extent to which the amount of heat medium supplied to the chilled water coil 32 is suppressed (that is, corresponds to the extent to which the cooling capacity is suppressed), it is defined as "cooling suppression rate Rcs" in this specification. .

The correction unit 744 multiplies the opening command Vc* given from the controller 742 by the cooling suppression rate Rcs to correct the opening command Vc* (Vc*=Vc*×Rcs). Cooling suppression rate Rcs can take a value of 0 (%) to 100 (%) depending on outside air temperature To and amount of solar radiation Si. When Rcs=100(%), Vc*=Vc*, and opening command Vc* is not substantially corrected. Therefore, the amount of heat medium supplied to the cold water coil 32 (cooling capacity) is not suppressed. As the cooling suppression rate Rcs decreases from 100(%), the degree of suppression of the amount of heat medium supplied to the cold water coil 32 (cooling capacity) increases.

The cooling suppression rate Rcs is calculated using a suppression rate Rc1 for suppressing the cooling capacity against an increase in outside air temperature and a suppression rate Rc2 for suppressing the cooling capacity against an increase in the amount of solar radiation.

Both the outside air temperature and the amount of solar radiation lead to an increase in the indoor temperature, which acts as a cooling load, but also acts as a positive factor during heating operation. Therefore, in the present embodiment, correction unit 744 is configured to calculate cooling suppression rate Rcs according to the outdoor temperature and the amount of solar radiation, thereby suppressing the amount of heat removed from room 52 due to the outdoor temperature and the amount of solar radiation. This makes it possible to reduce the amount of heat supplied to the room 52 in the heating operation that follows the cooling operation.

Specifically, the suppression rate calculator 82 calculates the suppression rate Rc1 based on the outside air temperature To detected by the outside air temperature sensor 24 . The suppression rate Rc1 corresponds to an example of "first suppression rate". FIG. 5 is a diagram schematically showing an example of the relationship between the outside air temperature To and the suppression rate Rc1. The horizontal axis of FIG. 5 indicates the outside air temperature To, and the vertical axis indicates the suppression rate Rc1. The suppression rate Rc1 can take a value of 0(%) to 100(%).

In the example of FIG. 5, when To≧To2, the suppression rate Rc1 is set to 100%. When To2>To≧To1, the suppression rate Rc1 is set to decrease as the outside air temperature To decreases. When To<To1, the suppression rate Rc1 is set to Xc (%) (0<Xc<100).

As the suppression rate Rc1 decreases from 100 (%), the extent to which the amount of heat medium supplied to the cold water coil 32 (cooling capacity) is suppressed increases. As shown in FIG. 5, the lower the outside air temperature To, the lower the suppression rate Rc1. can be suppressed from being excessively cooled. As a result, energy consumption during cooling operation can be reduced. In addition, since the amount of heat supplied to the room 52 can be reduced when shifting from the cooling operation to the heating operation, the energy consumption during the heating operation can be reduced.

Note that Xc (%) corresponds to the lower limit of the suppression rate Rc1. By setting the lower limit value Xc to the suppression rate Rc1, it is possible to suppress the deterioration of the comfort of the room 52 due to the suppression of the cooling capacity.

The relationship between the outside air temperature To and the suppression rate Rc1 (temperatures To1, To2 and lower limit value Xc) can be freely set while considering the trade-off between the energy consumption of the air conditioner 10 and the comfort of the room 52. .

By pre-storing the relationship shown in FIG. 5 as a map or a relational expression in the memory 204, the suppression rate calculator 82 calculates the suppression rate Rc1 based on the outside air temperature To detected by the outside air temperature sensor 24. be able to.

Returning to FIG. 4, the suppression rate calculator 84 calculates the suppression rate Rc2 based on the solar radiation amount Si detected by the solar radiation sensor 26. The suppression rate Rc2 corresponds to an example of the "second suppression rate". FIG. 6 is a diagram schematically showing an example of the relationship between the solar radiation amount Si and the suppression rate Rc2. The horizontal axis of FIG. 6 indicates the solar radiation amount Si, and the vertical axis indicates the suppression rate Rc2. The suppression rate Rc2 can take a value of 0(%) to 100(%).

In the example of FIG. 6, when Si≧Si2, the suppression rate Rc2 is set to 100 (%). When Si2>Si≧Si1, the suppression rate Rc2 is set to decrease as the amount of solar radiation Si decreases. When Si<Si2, the suppression rate Rc2 is set to Yc (%) (0<Yc<100). Yc (%) corresponds to the lower limit of the suppression rate Rc2. By setting the lower limit value Yc for the suppression rate Rc2, it is possible to suppress the deterioration of the comfort of the room 52 due to the suppression of the cooling capacity.

As with the suppression rate Rc1 shown in FIG. 5, as the suppression rate Rc2 also decreases from 100 (%), the extent to which the amount of heat medium supplied to the cold water coil 32 (cooling capacity) is suppressed increases. As shown in FIG. 6, the suppression rate Rc2 is decreased as the amount of solar radiation Si decreases, that is, by increasing the extent to which the cooling capacity is suppressed. Since it is possible to suppress the excessive cooling of 52, it is possible to reduce energy consumption during the cooling operation. In addition, since the amount of heat supplied to the room 52 can be reduced when shifting from the cooling operation to the heating operation, the energy consumption during the heating operation can be reduced.

The relationship between the amount of solar radiation Si and the suppression rate Rc2 (the amounts of solar radiation Si1, Si2 and the lower limit Yc) can be freely set while considering the trade-off between the energy consumption of the air conditioner 10 and the comfort of the room 52. can.

By pre-storing the relationship shown in FIG. 6 in the memory 204 as a map or a relational expression, the suppression rate calculator 84 calculates the suppression rate Rc2 based on the solar radiation amount Si detected by the solar radiation sensor 26. be able to.

Returning to FIG. 4, the multiplier 85 calculates the cooling suppression rate Rcs by multiplying the suppression rate Rc1 and the suppression rate Rc2 (Rcs=Rc1×Rc2). Multiplier 85 inputs the calculated cooling suppression rate Rcs to a first input terminal of switching section 86 .

The switching section 86 has a first input terminal, a second input terminal and an output terminal. The switching unit 86 receives the cooling suppression rate Rcs from the multiplier 85 at its first input terminal, and receives the upper limit value of 100 (%) of the cooling suppression rate Rcs at its second input terminal. The switching unit 86 selects one of the inputs and outputs it to the output terminal according to the execution command from the main control unit 72 . Specifically, when the execution command is at the H level, which is the activation level, switching unit 86 outputs the cooling suppression rate Rcs (=Rc1×Rc2) received by the first input terminal to the output terminal. When the execution command is at the L level, which is the deactivation level, the switching unit 86 outputs the upper limit value (100(%)) of the cooling suppression rate received by the second input terminal to the output terminal.

Multiplier 88 corrects opening command Vc* by multiplying opening command Vc* generated by controller 742 by cooling suppression rate Rcs from switching unit 86 (Vc*=Vc*×Rcs). . When Rcs=100%, the opening command Vc* is output to the cold water two-way valve 34 without being substantially corrected. On the other hand, when Rcs<100%, the opening command Vc* is corrected to a value smaller than the original opening command Vc* according to the magnitude of the cooling suppression rate Rcs. It is output to the direction valve 34 . The chilled water two-way valve 34 adjusts the amount of heat medium supplied to the chilled water coil 32 by controlling the degree of opening according to the degree of opening command Vc*.

FIG. 7 is a diagram showing an example of opening degree control of the cold water two-way valve 34 in the cooling control section 74. As shown in FIG. FIG. 7 shows an example of the relationship between the indoor temperature Tr and the opening command Vc* of the cold water two-way valve 34. As shown in FIG. The horizontal axis of FIG. 7 indicates the indoor temperature Tr, and the vertical axis indicates the opening command Vc*. A waveform k1 shows the relationship in the cooling main period. Waveform k2 shows the relationship in the heating main period.

As shown by the waveform k1, in the cooling main period, when the room temperature Tr is equal to or lower than the cooling set temperature Tsc, the opening command Vc* is set to 0% (fully closed). When the room temperature Tr exceeds the cooling set temperature Tsc, the opening command Vc* changes in proportion to the deviation ΔTc of the room temperature Tr from the cooling set temperature Tsc. Note that when the indoor temperature Tr exceeds the predetermined threshold temperature Tcth, the opening command Vc* is fixed at 100% (fully open).

On the other hand, in the heating main period, the opening command Vc* is multiplied by the cooling suppression rate Rcs calculated based on the detected values of the outside air temperature To and the amount of solar radiation Si. Therefore, the opening degree command Vc* for a certain room temperature Tr is smaller than the opening degree command Vc* for the same room temperature Tr during the main cooling period. That is, the amount of heat medium supplied to the cold water coil 32 at a certain indoor temperature Tr is smaller during the heating main period than during the cooling main period. As a result, the cooling capacity in the heating main period is suppressed.

In this way, when the cooling operation is performed during the heating main period, the process of suppressing the supply amount of the heat medium to the chilled water coil 32 is executed to reduce the cooling capacity, so that the cooling operation and the following cooling operation are performed. It is possible to reduce the energy consumption of the air conditioner 10 in the heating operation performed by

(Configuration of heating control unit)
Next, the functional configuration of the heating control unit 76 will be described with reference to FIGS. 8 to 12. FIG.

FIG. 8 is a block diagram showing a configuration example of the heating control unit 76 shown in FIG. As shown in FIG. 8, the heating control unit 76 sets the opening command Vh* of the hot water two-way valve 38 by feedback control for causing the indoor temperature Tr detected by the temperature and humidity sensor 22 to follow the heating set temperature Tsh. configured to generate

Specifically, the heating controller 76 includes a subtractor 760 , a controller 762 and a corrector 764 . A subtractor 760 calculates a deviation ΔTh of the room temperature Tr from the heating set temperature Tsh (ΔTh=Tsh−Tr).

The controller 762 receives the deviation ΔTh calculated by the subtractor 760 as an input, and performs a control operation to set the deviation ΔTh to 0, thereby generating an opening command Vh* for the hot water two-way valve 38 . That is, the opening degree command Vh* of the hot water two-way valve 38 corresponds to the control amount for setting Tr=Tsh. Note that a PI controller, a PID controller, or the like can be used as the controller 762 .

The correction unit 764 adjusts the opening degree of the hot water two-way valve 38 based on the execution command given from the main control unit 72, the outside air temperature To detected by the outside air temperature sensor 24, and the amount of solar radiation Si detected by the amount of solar radiation sensor 26. Correct command Vh*.

Specifically, the main control unit 72 determines whether or not the current time corresponds to the cooling main period based on current time information given from a clock (not shown). When the current time corresponds to the main cooling period, the main control unit 72 generates an execution command for suppressing the amount of heat medium supplied to the hot water coil 36 . If the current time does not correspond to the main cooling period, the main control unit 72 does not generate the execution command. That is, the main control unit 72 causes the heating control unit 76 to perform a process of suppressing the amount of heat medium supplied to the hot water coil 36 when the heating operation is performed during the cooling main period.

As described above, cooling operation is the main operation during the cooling main period. On the other hand, since the air conditioner 10 is configured to be able to switch between the cooling operation and the heating operation according to the indoor temperature Tr, when the indoor temperature Tr falls below the heating set temperature Tsh during the cooling main period, , the air conditioner 10 may temporarily perform the heating operation.

For example, when the indoor temperature Tr is lower than the heating set temperature Tsh for several hours in the early morning when the outdoor temperature is low and the amount of solar radiation is low, the heating operation is temporarily performed to raise the indoor temperature Tr to the heating set temperature Tsh. is executed. After that, when the indoor temperature Tr rises above the cooling set temperature Tsc so as to follow the increase in the outside air temperature and the increase in the amount of solar radiation, the operation shifts to the cooling operation.

In such a case, as the outside air temperature rises and the amount of solar radiation increases, the heating of the room 52 tends to be excessive due to the synergistic effect with the heating operation, resulting in a wasteful increase in the energy consumption of the air conditioner 10 during the heating operation. Become.

Also, after shifting to the cooling operation, the cooling operation is performed so as to cancel out the heating effect of the previous heating operation. This is because the heating effect of the previous heating operation works as a cooling load. That is, immediately after the start of the cooling operation, the cooling operation is performed so as to remove the amount of heat supplied to the room 52 by the previous heating operation. As a result, the energy consumption of the air conditioner 10 during the cooling operation is unnecessarily increased.

In order to address the above concerns, in the present embodiment, the heating effect is suppressed by reducing the heating capacity of the air conditioner 10 during the cooling main period, as described below.

Specifically, when the correction unit 764 receives an execution command from the main control unit 72, the correction unit 764 corrects the opening command Vh* generated by the controller 762 so as to reduce the opening command Vh*. . That is, when the heating operation is performed during the cooling main period, the correction unit 764 reduces the supply amount of the heat medium supplied to the hot water coil 36 from the supply amount corresponding to the deviation ΔTh. reduce the heating capacity of FIG. 9 is a block diagram showing a configuration example of the correction unit 764 shown in FIG.

As shown in FIG. 9, the correction unit 764 includes suppression

rate calculation units

92 and 94,

multipliers

95 and 98, and a switching unit 96.

Restriction rate calculators

92 and 94 and multiplier 95 calculate a correction coefficient for correcting opening command Vh*. Since this correction coefficient represents the extent to which the amount of heat medium supplied to the hot water coil 36 is suppressed (that is, corresponds to the extent to which the heating capacity is suppressed), it is defined as "heating suppression rate Rhs" in this specification. .

The correction unit 764 corrects the opening command Vh* by multiplying the opening command Vh* given from the controller 762 by the heating suppression rate Rhs (Vh*=Vh*×Rhs). Heating suppression rate Rhs can take a value of 0 (%) to 100 (%) depending on outside air temperature To and amount of solar radiation Si. When Rhs=100(%), Vh*=Vh*, and the opening command Vh* is not substantially corrected. Therefore, the amount of heat medium supplied to the hot water coil 36 (heating capacity) is not suppressed. As the heating suppression rate Rhs decreases from 100(%), the extent to which the amount of heat medium supplied to the hot water coil 36 (heating capacity) is suppressed increases.

The heating suppression rate Rhs is calculated using a suppression rate Rh1 for suppressing the heating capacity in response to a decrease in outside air temperature and a suppression rate Rh2 for suppressing the heating capacity in response to a decrease in the amount of solar radiation.

As mentioned above, both the outside air temperature and the amount of solar radiation lead to an increase in the indoor temperature, which acts as a cooling load, but also acts as a positive factor during heating operation. Therefore, in the present embodiment, the correction unit 764 is configured to calculate the heating suppression rate Rhs according to the outside air temperature To and the amount of solar radiation Si, thereby suppressing the amount of heat supplied to the room 52 due to the outside temperature and the amount of solar radiation. do. This makes it possible to reduce the amount of heat removed from the room 52 during the cooling operation.

Specifically, the suppression rate calculator 92 calculates the suppression rate Rh1 based on the outside air temperature To detected by the outside air temperature sensor 24 . The suppression rate Rh1 corresponds to an example of the "third suppression rate". FIG. 10 is a diagram schematically showing an example of the relationship between the outside air temperature To and the suppression rate Rh1. The horizontal axis of FIG. 10 indicates the outside air temperature To, and the vertical axis indicates the suppression rate Rh1. The suppression rate Rh1 can take values from 0(%) to 100(%).

In the example of FIG. 10, when To≦To3, the suppression rate Rh1 is set to 100 (%). When To3<To≤To4, the suppression rate Rh1 is set to decrease as the outside air temperature To increases. When To>To4, the suppression rate Rh1 is set to Xh (%) (0<Xh<100). Xh (%) corresponds to the lower limit of the suppression rate Rh1. By setting the lower limit value Xh for the suppression rate Rh1, it is possible to suppress the deterioration of the comfort of the room 52 due to the suppression of the heating capacity.

As the suppression rate Rh1 decreases from 100 (%), the extent to which the amount of heat medium supplied to the hot water coil 36 (heating capacity) is suppressed increases. As shown in FIG. 10, the higher the outside air temperature To, the lower the suppression rate Rh1, that is, the higher the degree of suppression of the heating capacity. can be suppressed from being excessively heated. As a result, energy consumption during heating operation can be reduced. Moreover, since the amount of heat removed from the room 52 can be reduced when the heating operation is shifted to the cooling operation, the energy consumption during the cooling operation can be reduced.

The relationship between the outside air temperature To and the suppression rate Rh1 (temperatures To3, To4 and lower limit value Xh) can be freely set while considering the trade-off between the energy consumption of the air conditioner 10 and the comfort of the room 52. .

By pre-storing the relationship shown in FIG. 10 in the memory 204 as a map or a relational expression, the suppression rate calculator 92 calculates the suppression rate Rh1 based on the outside air temperature To detected by the outside air temperature sensor 24. be able to.

Returning to FIG. 9, the suppression rate calculator 94 calculates the suppression rate Rh2 based on the solar radiation amount Si detected by the solar radiation sensor 26. The suppression rate Rh2 corresponds to an example of the "fourth suppression rate". FIG. 11 is a diagram schematically showing an example of the relationship between the solar radiation amount Si and the suppression rate Rh2. The horizontal axis of FIG. 11 indicates the amount of solar radiation Si, and the vertical axis indicates the suppression rate Rh2. The suppression rate Rh2 can take a value of 0(%) to 100(%).

In the example of FIG. 11, when Si≤Si3, the suppression rate Rh2 is set to 100 (%). When Si3<Si≤Si4, the suppression rate Rh2 is set to decrease as the amount of solar radiation Si increases. When Si>Si4, the suppression rate Rh2 is set to Yh (%) (0<Yh<100). Yh (%) corresponds to the lower limit of the suppression rate Rh2. By setting the lower limit value Yh for the suppression rate Rh2, it is possible to suppress deterioration of comfort in the room 52 due to suppression of the heating capacity.

As with the suppression rate Rh1 shown in FIG. 10, as the suppression rate Rh2 also decreases from 100 (%), the extent to which the amount of heat medium supplied to the hot water coil 36 (heating capacity) is suppressed increases. As shown in FIG. 11, by decreasing the suppression rate Rc2 as the amount of solar radiation Si increases, that is, by increasing the extent to which the heating capacity is suppressed, the synergistic effect of the increase in the amount of solar radiation Si and the heating operation results in a Since it is possible to suppress the excessive heating of 52, it is possible to reduce energy consumption during the heating operation. Moreover, since the amount of heat removed from the room 52 can be reduced when shifting from the heating operation to the cooling operation, the energy consumption during the cooling operation can be reduced.

The relationship between the amount of solar radiation Si and the suppression rate Rh2 (the amounts of solar radiation Si3, Si4 and the lower limit value Yh) can be freely set while considering the trade-off between the energy consumption of the air conditioner 10 and the comfort of the room 52. can.

By pre-storing the relationship shown in FIG. 11 in the memory 204 as a map or a relational expression, the suppression rate calculator 94 calculates the suppression rate Rh2 based on the solar radiation amount Si detected by the solar radiation sensor 26. be able to.

Returning to FIG. 9, the multiplier 95 calculates the heating suppression rate Rhs by multiplying the suppression rate Rh1 and the suppression rate Rh2 (Rhs=Rh1×Rh2). Multiplier 95 inputs calculated heating suppression rate Rhs to a first input terminal of switching section 96 .

The switching section 96 has a first input terminal, a second input terminal and an output terminal. The switching unit 96 receives the heating suppression rate Rhs from the multiplier 95 at its first input terminal, and receives the upper limit value 100 (%) of the heating suppression rate Rhs at its second input terminal. The switching unit 96 selects one of the inputs according to the execution command from the main control unit 72 and outputs it to the output terminal. Specifically, when the execution command is at the H level, which is the activation level, the switching unit 96 outputs the heating suppression rate Rhs (=Rh1×Rh2) received by the first input terminal to the output terminal. When the execution command is at the L level, which is the inactivation level, the switching unit 96 outputs the upper limit value (100(%)) of the heating suppression rate received by the second input terminal to the output terminal.

Multiplier 98 corrects opening command Vh* by multiplying opening command Vh* generated by controller 762 by heating suppression rate Rhs from switching unit 96 (Vh*=Vh*×Rhs). . When Rhs=100%, the opening command Vh* is output to the hot water two-way valve 38 without being substantially corrected. On the other hand, when Rhs<100%, the opening command Vh* is corrected to a value smaller than the original opening command Vh* according to the magnitude of the heating suppression rate Rhs. Output to direction valve 38 . The hot water two-way valve 38 adjusts the amount of heat medium supplied to the hot water coil 36 by controlling the degree of opening according to the degree of opening command Vh*.

FIG. 12 is a diagram showing an example of opening degree control of the hot water two-way valve 38 in the heating control section 76. As shown in FIG. FIG. 12 shows an example of the relationship between the indoor temperature Tr and the opening command Vh* of the hot water two-way valve 38. As shown in FIG. The horizontal axis of FIG. 12 indicates the room temperature Tr, and the vertical axis indicates the opening command Vh*. Waveform k3 shows the relationship in the heating main period. Waveform k4 shows the relationship in the cooling main period.

As shown by the waveform k3, in the heating main period, when the indoor temperature Tr is equal to or higher than the heating set temperature Tsh, the opening command Vh* is set to 0% (fully closed). When the room temperature Tr falls below the heating set temperature Tsh, the opening command Vh* changes in proportion to the deviation ΔTh of the room temperature Tr from the heating set temperature Tsh. Note that when the room temperature Tr is lower than the predetermined threshold temperature Thth, the opening command Vh* is fixed at 100% (fully open).

On the other hand, in the cooling main period, the opening command Vh* is multiplied by the heating suppression rate Rhs calculated based on the detected values of the outside air temperature To and the amount of solar radiation Si. Therefore, the opening degree command Vh* for a certain room temperature Tr is smaller than the opening degree command Vh* for the same room temperature Tr in the heating main period. That is, the amount of heat medium supplied to the hot water coil 36 at a certain indoor temperature Tr is smaller during the cooling main period than during the heating main period. As a result, the heating capacity in the cooling main period is suppressed.

In this way, when the heating operation is performed during the cooling main period, the heating operation and the following heating operation are performed by executing the process of suppressing the supply amount of the heat medium to the hot water coil 36 to reduce the heating capacity. It is possible to reduce the energy consumption of the air conditioner 10 in the cooling operation performed by

(flowchart)
FIG. 13 is a flow chart illustrating a processing procedure for controlling the opening degrees of the cold water two-way valve 34 and the hot water two-way valve 38 according to the present embodiment. A control process according to the flowchart shown in FIG. 13 is repeatedly executed by the controller 20 .

As shown in FIG. 13, the controller 20 detects the room temperature Tr based on the output signal of the temperature/humidity sensor 22 in step 01 (hereinafter step is simply referred to as S). The controller 20 compares the indoor temperature Tr with the cooling set temperature Tsc in S02. When the indoor temperature Tr is higher than the cooling set temperature Tsc (YES determination in S02), the controller 20 controls the opening of the cold water two-way valve 34 according to the procedure shown in S03 to S11.

Specifically, in S03, the controller 20 executes a control operation for setting the deviation ΔTc between the cooling set temperature Tsc and the room temperature Tr to 0, thereby setting the opening command Vc* of the cold water two-way valve 34 to Generate.

The controller 20 determines in S04 whether or not the current time corresponds to the heating main period based on current time information given from a clock (not shown). If the current time does not correspond to the heating main period (NO determination in S04), the controller 20 skips the processes of S05 to S10.

On the other hand, if the current time corresponds to the heating main period (YES determination in S04), the controller 20 executes processing to suppress the amount of heat medium supplied to the cold water coil 32. Specifically, the controller 20 detects the outside air temperature To based on the output signal of the outside air temperature sensor 24 in S05. In S06, the controller 20 calculates the suppression rate Rc1 according to the detected value of the outside air temperature To. In S06, the controller 20 refers to the relationship between the outside air temperature To and the suppression rate Rc1 pre-stored in the memory 204 (see FIG. 5) to calculate the suppression rate Rc1 based on the detected value of the outside air temperature To. do.

Next, the controller 20 detects the amount of solar radiation Si based on the output signal of the solar radiation sensor 26 in S07. In S08, the controller 20 calculates the suppression rate Rc2 according to the detected value of the amount of solar radiation Si. In S08, the controller 20 calculates the suppression rate Rc2 based on the detected value of the solar radiation amount Si by referring to the relationship between the solar radiation amount Si and the suppression rate Rc2 pre-stored in the memory 204 (see FIG. 6). do.

In S09, the controller 20 calculates the cooling suppression rate Rcs by multiplying the suppression rate Rc1 calculated in S06 and the suppression rate Rc2 calculated in S08 (Rcs=Rc1×Rc2). The controller 20 corrects the opening command Vc* generated in S03 by multiplying the opening command Vc* generated in S03 by the cooling suppression rate Rcs calculated in S09 (Vc*=Vc*×Rcs ).

The controller 20 adjusts the supply of the heat medium to the cold water coil 32 by controlling the opening of the cold water two-way valve 34 according to the opening command Vc* in S11. When the opening command Vc* is corrected in S10, the opening of the cold water two-way valve 34 is controlled according to the corrected opening command Vc*.

Returning to S02, if the room temperature Tr is equal to or lower than the cooling set temperature Tsc (NO in S02), the controller 20 compares the room temperature Tr with the heating set temperature Tsh in S12. When the room temperature Tr is lower than the heating set temperature Tsh (YES in S12), the controller 20 controls the opening of the hot water two-way valve 38 according to the procedure shown in S13 to S21.

Specifically, in S13, the controller 20 executes a control operation for setting the deviation ΔTh between the heating set temperature Tsh and the indoor temperature Tr to 0, thereby setting the opening command Vh* of the hot water two-way valve 38 to Generate.

The controller 20 determines in S14 whether or not the current time corresponds to the cooling main period based on current time information given from a clock (not shown). If the current time does not correspond to the cooling main period (NO judgment in S14), the controller 20 skips the processes of S15 to S20.

On the other hand, if the current time corresponds to the main cooling period (YES determination in S14), the controller 20 executes processing to suppress the amount of heat medium supplied to the hot water coil 36. Specifically, the controller 20 detects the outside air temperature To based on the output signal of the outside air temperature sensor 24 in S15. In S16, the controller 20 calculates the suppression rate Rh1 according to the detected value of the outside air temperature To. In S16, the controller 20 refers to the relationship between the outside air temperature To and the suppression rate Rh1 pre-stored in the memory 204 (see FIG. 10) to calculate the suppression rate Rh1 based on the detected value of the outside air temperature To. do.

Next, the controller 20 detects the solar radiation Si based on the output signal of the solar radiation sensor 26 in S17. In S18, the controller 20 calculates the suppression rate Rh2 according to the detected value of the amount of solar radiation Si. In S18, the controller 20 calculates the suppression rate Rh2 based on the detected value of the solar radiation amount Si by referring to the relationship between the solar radiation amount Si and the suppression rate Rh2 pre-stored in the memory 204 (see FIG. 11). do.

In S19, the controller 20 calculates the heating suppression rate Rhs by multiplying the suppression rate Rh1 calculated in S16 and the suppression rate Rh2 calculated in S18 (Rhs=Rh1×Rh2). The controller 20 multiplies the opening command Vh* generated in S13 by the heating suppression rate Rhs calculated in S19 in S20, thereby correcting the opening command Vh* (Vh*=Vh*×Rhs ).

The controller 20 adjusts the supply of the heat medium to the hot water coil 36 by controlling the opening of the hot water two-way valve 38 according to the opening command Vh* in S21. When the opening command Vh* is corrected in S20, the opening of the hot water two-way valve 38 is controlled according to the corrected opening command Vh*.

(Operation example of an air conditioning system)
Next, an operation example of the air conditioning system according to the present embodiment will be described with reference to FIGS. 14 and 15. FIG.

FIG. 14 is a diagram showing the temporal transition of the outside air temperature in one day during the main cooling period. The horizontal axis of FIG. 14 indicates the time, and the vertical axis indicates the value of the outside air temperature To detected by the outside air temperature sensor 24 . In the example of FIG. 14, the time zone from 8:30 am to 6:00 pm (18:00) is the time zone (air conditioning time zone) in which the air conditioner 10 is operated to condition the air in the room 52. ), and the time zones from 0:00 am to 8:30 am and from 6:00 pm to 24:00 pm are time zones in which the air conditioner 10 is in a stopped state.

As shown in FIG. 14, the outside air temperature To becomes low during the night when there is no sunlight, and gradually rises after sunrise (around 5:00 am). As the outside air temperature To rises, the amount of heat entering the room 52 gradually increases, so the room temperature Tr rises gradually.

However, the indoor temperature Tr may be lower than the heating set temperature Tsh for several hours after the air conditioner 10 is started. In this case, the air conditioner 10 performs heating operation in order to increase the indoor temperature Tr to the heating set temperature Tsh. A region k1 in the figure corresponds to a time period during which the heating operation is performed.

During the heating operation, the outside air temperature To rises and the amount of heat entering the room 52 increases. Furthermore, the amount of heat generated by the human body and equipment in the room 52 also increases. Therefore, the amount of heat supplied to the room 52 increases due to the synergistic effects of the heating operation, the outside air temperature, the human body, etc., and the room temperature Tr rises. The controller 20 calculates a heating suppression rate Rhs according to the outside air temperature To and the amount of solar radiation Si, and corrects the opening command Vh* of the hot water two-way valve 38 using the calculated heating suppression rate Rhs.

FIG. 10 shows the suppression rate Rh1(ta) calculated from the outside air temperature To at time ta immediately after the start of the heating operation and the suppression rate Rh1(tb) calculated from the outside air temperature To at time tb during the heating operation. It is shown. FIG. 11 shows the suppression rate Rh2(ta) calculated from the solar radiation amount Si at time ta and the suppression rate Rh2(tb) calculated from the solar radiation amount Si at time tb.

The controller 20 multiplies Rh1(ta) and Rh2(ta) to calculate the heating suppression rate Rhs(ta) at time ta. Controller 20 multiplies Rh1(tb) and Rh2(tb) to calculate heating suppression rate Rhs(tb) at time tb. Since Rh1(ta)>Rh1(tb) and Rh2(ta)>Rh2(tb), Rhs(ta)>Rhs(tb).

As described above, during heating operation, the heating suppression rate Rhs decreases as the outside air temperature To and the amount of solar radiation Si rise, so that the amount of heat medium supplied to the hot water coil 36 gradually decreases. As a result, the amount of heat replenished to the room 52 gradually decreases, so that excessive heating can be suppressed. Also, it is possible to reduce the cooling load when shifting to the cooling operation. Therefore, it is possible to reduce the energy consumption of the air conditioner 10 in the heating operation and the cooling operation that follows the heating operation.

FIG. 15 is a diagram showing the temporal transition of the outside air temperature in one day during the main heating period. The horizontal axis of FIG. 15 indicates the time, and the vertical axis indicates the value of the outside air temperature To detected by the outside air temperature sensor 24 . In the example of FIG. 15, as in FIG. 14, the air conditioner 10 is operated during the time period from 8:30 am to 6:00 pm (18:00) to condition the air in the room 52. The time zone (air-conditioning time zone) during which the air conditioner 10 is stopped is defined as the time zone from 0:00 am to 8:30 am and from 6:00 pm to 24:00 pm.

As shown in FIG. 15, the outside air temperature To becomes low during the night when there is no sunlight, and gradually rises after sunrise (around 5:00 am). As the outside air temperature To rises, the amount of heat entering the room 52 gradually increases, so the room temperature Tr rises gradually.

When the air conditioner 10 starts up, the room temperature Tr is lower than the heating set temperature Tsh, so the air conditioner 10 performs heating operation. During the heating operation, the amount of heat entering the room 52 increases due to the rise in the outside air temperature To and the increase in the amount of solar radiation, and the amount of heat generated by the human body and equipment in the room 52 also increases. The amount of heat supplied to the room 52 increases due to the synergistic effects of the heating operation, the outside air temperature, the human body, etc., and the room temperature Tr rises.

As a result, the room temperature Tr may exceed the cooling set temperature Tsc for several hours around 1:00 pm when the outside air temperature To peaks. In this case, the air conditioner 10 performs cooling operation in order to lower the room temperature Tr to the cooling set temperature Tsc. A region k2 in the figure corresponds to the time period during which the cooling operation is performed.

During the execution of the cooling operation, the outside air temperature To gradually decreases and the amount of heat entering the room 52 decreases. Also, the amount of solar radiation Si gradually decreases, and the amount of heat entering the room 52 decreases. The amount of heat removed from the room 52 increases due to the synergistic action of the cooling operation, the outside air temperature, and the amount of solar radiation, thereby lowering the room temperature Tr. The controller 20 calculates the cooling suppression rate Rcs according to the outside air temperature To and the amount of solar radiation Si, and corrects the opening command Vc* of the cold water two-way valve 34 using the calculated cooling suppression rate Rcs.

FIG. 5 shows the suppression rate Rc1(tc) calculated from the outside air temperature To at time tc during the cooling operation and the suppression rate Rc1(td) calculated from the outside air temperature To at time td immediately before the end of the cooling operation. It is FIG. 6 shows the suppression rate Rc2(tc) calculated from the solar radiation amount Si at time tc and the suppression rate Rc2(td) calculated from the solar radiation amount Si at time td.

The controller 20 multiplies Rc1(tc) and Rc2(tc) to calculate the cooling suppression rate Rcs(tc) at time tc. Controller 20 multiplies Rc1(td) and Rc2(td) to calculate cooling suppression rate Rcs(td) at time td. Since Rc1(tc)>Rc1(td) and Rc2(tc)>Rc2(td), Rcs(tc)>Rcs(td). During the cooling operation, the cooling suppression rate Rcs decreases as the outside air temperature To decreases and the amount of solar radiation Si decreases, so that the amount of heat medium supplied to the chilled water coil 32 gradually decreases. Therefore, the amount of heat removed from the room 52 gradually decreases, and excessive cooling can be suppressed. Also, the heating load can be reduced when shifting to the heating operation. As a result, it is possible to reduce the energy consumption of the air conditioner 10 in the cooling operation and in the heating operation that follows the cooling operation.

<Other configuration examples>
In the above-described embodiment, the configuration example in which the cooling suppression rate Rcs in the heating main period and the heating suppression rate Rhs in the cooling main period are each calculated according to the outside air temperature To and the amount of solar radiation Si has been described. By adopting a configuration in which the cooling suppression rate Rcs and the heating suppression rate Rhs are calculated according to at least one of the amount of solar radiation Si and the amount of solar radiation Si, the same effects as in the present embodiment described above can be obtained.

Therefore, it is also possible to adopt a configuration in which the cooling suppression rate Rcs and the heating suppression rate Rhs are calculated according to either one of the outside air temperature To and the amount of solar radiation Si. Even in this case, during the cooling operation during the heating main operation period, the cooling suppression rate Rcs is calculated so that the upper limit value is 100% and the value decreases as the outside air temperature To decreases or the solar radiation amount Si decreases. . This makes it possible to reduce the energy consumption of the air conditioner 10 during the cooling operation and during the heating operation that follows the cooling operation.

Also, during the heating operation during the cooling-main operation period, the heating suppression rate Rhs is calculated so that the upper limit value is 100% and the value decreases as the outside air temperature To rises or the solar radiation amount Si increases. This makes it possible to reduce the energy consumption of the air conditioner 10 during the heating operation and during the cooling operation that follows the heating operation.

The embodiments disclosed this time should be considered illustrative in all respects and not restrictive. The present invention is indicated by the scope of claims rather than the above description, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

10 air conditioner, 11,580 suction port, 12,560 air outlet, 14 supply air duct, 15 ventilation duct, 16 return air duct, 20 controller, 22 temperature and humidity sensor, 24 outside temperature sensor, 26 solar radiation sensor, 30 filter, 32 cold water coil, 33 cold water circulation path, 34 cold water two-way valve, 36 hot water coil, 37 hot water circulation path, 38 hot water two-way valve, 40 humidifier, 41 humidification supply path, 42 humidification two-way valve, 44 fan, 50 building, 52 room, 54 window, 56 ceiling, 58 floor, 70 input section, 72 main control section, 74 cooling control section, 76 heating control section, 78 humidity control section, 80 fan control section, 82, 84, 92, 94 suppression rate calculation unit, 85, 88, 95, 98 multiplier, 86, 96 switching unit, 100 air conditioning system, 202 CPU, 204 memory, 206 I/O circuit, 740, 760 subtractor, 742 , 762 Controller, 744, 764 Corrector, Tr Indoor temperature, To Outdoor temperature, Si Solar radiation amount, Tsc Cooling set temperature, Tsh Heating set temperature, Vc*, Vh* Opening command, Rcs Cooling suppression rate, Rhs Heating suppression rate, Rc1, Rc2, Rh1, Rh2 suppression rate.

Claims

an air conditioner for conditioning the indoor air of the building;
a temperature sensor installed in the room to detect the room temperature;
a controller that switches between cooling operation and heating operation of the air conditioner according to the indoor temperature;
The air conditioner is
a first heat exchanger that cools the air by heat exchange between the first heat medium and the air;
a second heat exchanger that heats the air by exchanging heat between the second heat medium and the air;
a first valve provided in the circulation path of the first heat medium and opened during the cooling operation;
a second valve provided in the circulation path of the second heat medium and opened during the heating operation;
a fan that causes the air to flow through the first heat exchanger and the second heat exchanger;
The controller is
During the cooling operation, the first heat medium to the first heat exchanger is supplied to the first heat exchanger by controlling the degree of opening of the first valve according to the first deviation between the cooling set temperature and the indoor temperature. A cooling control unit that adjusts the supply amount of
During the heating operation, the second heat medium is supplied to the second heat exchanger by controlling the degree of opening of the second valve according to a second deviation between the heating set temperature and the room temperature. and a heating control unit that adjusts the amount of supply of
The cooling control unit supplies the first heat medium to the first heat exchanger when the cooling operation is performed in a heating main period in which the air in the room is adjusted mainly by the heating operation. is less than the supply amount of the first heat medium according to the first deviation,
The heating control unit supplies the second heat medium to the second heat exchanger when the heating operation is performed in a cooling main period in which the air in the room is adjusted mainly by the cooling operation. is less than the supply amount of the second heat medium according to the second deviation.
an outside air temperature sensor that detects the outside air temperature;
Further comprising a solar radiation sensor that detects the amount of solar radiation,
The cooling control unit is
a first controller that generates a first degree-of-opening command for the first valve by a control calculation with the first deviation as an input;
2. The air conditioning system according to claim 1, further comprising a first correction unit that corrects said first degree-of-opening command based on at least one of said outdoor temperature and said amount of solar radiation during said main heating period.
The first correction unit is configured to correct the first opening command by multiplying the first opening command generated by the first controller by a cooling suppression rate,
3. The air conditioning system according to claim 2, wherein said cooling suppression rate is calculated such that the upper limit value is 100% and the value decreases as the outdoor temperature decreases or the amount of solar radiation decreases.
The first correction unit calculates the cooling suppression rate by multiplying a first suppression rate calculated according to the outside temperature by a second suppression rate calculated according to the amount of solar radiation. configured to calculate
The first suppression rate is calculated so that the upper limit value is 100% and the value decreases as the outside temperature decreases,
4. The air conditioning system according to claim 3, wherein said second suppression rate has an upper limit of 100% and is calculated such that the value decreases as said amount of solar radiation decreases.
The air conditioning system according to claim 4, wherein each of said first suppression rate and said second suppression rate has a lower limit value greater than 0%.
an outside air temperature sensor that detects the outside air temperature;
Further comprising a solar radiation sensor that detects the amount of solar radiation,
The heating control unit
a second controller that generates a second opening degree command for the second valve by a control calculation using the second deviation as an input;
2. The air conditioning system according to claim 1, further comprising a second correction unit that corrects said second opening command based on at least one of said outdoor temperature and said amount of solar radiation during said main cooling period.
The second correction unit is configured to correct the second opening command by multiplying the second opening command generated by the second controller by a heating suppression rate,
7. The air conditioning system according to claim 6, wherein said heating suppression rate is calculated such that the upper limit value is 100% and the value decreases as the outdoor temperature increases or the amount of solar radiation increases.
The second correction unit calculates the heating suppression rate by multiplying a third suppression rate calculated according to the outside air temperature by a fourth suppression rate calculated according to the amount of solar radiation. configured to calculate
The third suppression rate is calculated so that the upper limit value is 100% and the value decreases as the outside temperature rises,
8. The air conditioning system according to claim 7, wherein said fourth suppression rate has an upper limit of 100% and is calculated such that the value decreases as said amount of solar radiation increases.
The air conditioning system according to claim 8, wherein each of said third suppression rate and said fourth suppression rate has a lower limit value greater than 0%.