JP3415547B2 - Constant temperature air conditioning system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant temperature air conditioning system for maintaining a constant temperature inside the air conditioning room, and more particularly to a constant temperature air conditioning system using a package unit in which a cooling unit and a heating unit are incorporated.

[0002]

2. Description of the Related Art For example, as shown in FIG. 4, a constant temperature air conditioning system for realizing an air conditioning room of constant temperature and humidity of ± 1 ° C. and ± 10% at a low cost is shown in FIG. Evaporator) 51b and other refrigeration cycle equipment cooling unit 51, electric heater heating unit 5
2. There is one using a package unit 50 in which a humidifying unit 53 for injecting heated steam, a blower 54, etc. are all incorporated in a casing, and such a constant temperature air conditioning system usually has a temperature and humidity in an air conditioning room R. In order to detect the temperature, the temperature detector 61 and the humidity detector 62 installed in the air conditioning room R are proportional to the output of the electric heater, which is the heating unit 52, based on the temperature detection signal output from the temperature detector 61. A temperature controller 63 for controlling and a humidity controller 64 for controlling the steam injection amount of the humidifying unit 53 by proportionally controlling the steam control valve 53a based on the humidity detection signal output from the humidity detector 62 are provided. ing.

By the way, in such a constant temperature and constant humidity air conditioning system using the package unit 50, when the cooling unit 51 is started and stopped according to the cooling load fluctuation, the start and stop of the cooling unit 51 itself becomes a disturbance. Since it becomes impossible to maintain the constant temperature and constant humidity, the cooling unit 51 is always operated at the maximum capacity regardless of the fluctuation of the cooling load, and is introduced into the package unit 50 through the return air duct RD and the outside air duct OD. The air (return air and outside air) is once supercooled and dehumidified, and then heated and humidified by the heating unit 52 and the humidifying unit 53 based on the control signals output from the temperature controller 63 and the humidity controller 64, respectively. By doing so, it is possible to cope with load fluctuations.

Further, in such a constant temperature and humidity constant temperature air conditioning system, as described above, the cooling unit 51 must be operated at the maximum capacity at all times, so that the fluctuating load that must be processed by the package unit 50 is minimized. In order to make it smaller, an external air conditioner OAC is installed separately,
The external air is introduced into the package unit 50 in a state where the fluctuating external air load is processed in advance by the external air conditioner OAC.

[0005]

However, as described above, the air supplied to the package unit 50 is once supercooled and dehumidified by the cooling unit 51, and then heated and humidified by the heating unit 52 and the humidifying unit 53. When the configuration is adopted, the air-conditioning room R can be kept at a constant temperature and humidity at a certain level, but even if the cooling load is small, the cooling unit 51 must always be forced to operate at maximum capacity, so much energy is wasted. ,
There was a problem that the constant temperature air conditioning system could not be operated efficiently.

Therefore, an object of the present invention is to provide a constant temperature air conditioning system capable of maintaining the constant temperature of the air conditioning room to some extent even when the cooling unit incorporated in the package unit is started and stopped according to the fluctuation of the cooling load. To provide.

[0007]

In order to solve the above-mentioned problems, the present invention relates to a constant temperature air conditioning system for maintaining a temperature inside a conditioned room using a package unit in which a cooling unit and a heating unit are incorporated. And
A blast temperature detector that detects the blast temperature of the package unit, an indoor temperature detector that detects the temperature in the air-conditioned room, and a temperature detection signal that is output from each of the blast temperature detector and the indoor temperature detector. And an air temperature controller and an indoor temperature controller that respectively output a control signal for proportionally controlling the output of the heating unit, and in a normal operating state, the air-conditioned room is maintained at a predetermined temperature. Based on a temperature detection signal output from the indoor temperature detector, the indoor temperature controller performs a constant indoor temperature control in which the output of the heating unit is proportionally controlled while performing start / stop control of the cooling unit. At the time when the cooling unit starts and stops, the temperature detection signal output from the air temperature detector so that the air temperature at that time is maintained. Based on the above, the constant temperature air conditioning system is characterized in that the blower temperature controller temporarily switches to a constant blower temperature control for proportionally controlling the output of the heating unit, and then returns to the constant indoor temperature control. To do.

In the constant temperature air conditioning system configured as described above, at the time when the cooling unit starts and stops in response to a change in the cooling load, the room temperature constant control that has been performed until then is temporarily interrupted, and cooling is performed. After switching to the constant blast temperature control that maintains the blast temperature when the unit starts and stops, when the system's operating condition stabilizes, the temperature is controlled again to the constant indoor temperature control. Even if the cooling capacity of the package unit suddenly changes, the temperature of the cooling unit at the time of starting and stopping is maintained as it is, and the room temperature of the air-conditioning room can be smoothly changed to the normal operating state with almost no change. . Therefore, it is possible to start and stop the cooling unit according to the cooling load fluctuation, which was not possible with the conventional constant temperature air conditioning system that constantly controls the indoor temperature, and it is possible to perform high-efficiency operation with less waste of energy. A constant temperature air conditioning system can be realized.

More specifically, as in the constant temperature air conditioning system according to claim 2, in a normal state, the width of the proportional band of the blower temperature controller is set to be extremely large, and the inside of the air conditioning room is Based on the temperature detection signal output from the indoor temperature detector, the indoor temperature controller performs proportional control of the output of the heating unit while performing start / stop control of the cooling unit so as to maintain the set temperature. After the cooling unit starts and stops, the blast temperature at that time is newly set as the set temperature of the blast temperature controller, and the width of the proportional band in the blast temperature controller is set extremely small. The width of the proportional band in the blower temperature controller may be gradually increased and returned to the initial setting value.

According to this constant temperature air conditioning system, in a normal operating condition, the width of the proportional band of the blast temperature controller is set to be extremely large. A large deviation does not occur, and the output of the heating unit is always proportionally controlled based on the temperature detection signal output from the indoor temperature detector.

On the other hand, when the cooling unit starts and stops, the blast temperature at that time is newly set as the set temperature of the blast temperature controller, and the width of the proportional band is set extremely small. Therefore, the deviation signal due to the change in the blowing temperature appears larger than the deviation signal due to the change in the room temperature. Therefore, immediately after the cooling unit starts and stops, the heating unit is not proportionally controlled based on the temperature detection signal output from the indoor temperature detector, and the blast temperature at the time when the cooling unit starts and stops is maintained. As described above, the heating unit is proportionally controlled based on the temperature detection signal output from the blast temperature detector. As a result, fluctuations in the blast temperature due to the start / stop of the cooling unit are immediately corrected, and the blast temperature at the start / stop of the cooling unit is reliably maintained, so that the cooling capacity of the package unit at the start / stop of the cooling unit is reduced. Even if the temperature suddenly changes, the room temperature of the air-conditioning room hardly changes and the air-conditioning room is kept at a constant temperature.

After that, by gradually increasing the width of the proportional band of the blast temperature controller and returning it to the initial setting value, the deviation signal due to the room temperature fluctuation appears larger than the deviation signal due to the fluctuation of the blast temperature. The constant blast temperature control is gradually switched to the constant indoor temperature control to return to the normal operating state. In this way, by gradually increasing the width of the proportional band of the blast temperature controller and returning it to the initial setting value, the blast temperature constant control is gradually switched to the indoor temperature constant control. Even if the air-conditioning load in the air-conditioned room changes, the heating unit can be controlled in consideration of the air-conditioning load change, and the influence of the air-conditioning load change occurring during control switching can be minimized.

Further, as in the constant temperature air conditioning system according to claim 3, a constant temperature air conditioning system for maintaining the temperature and humidity in the air-conditioned room by using a package unit in which a cooling unit, a heating unit and a humidifying unit are incorporated. There is a blast temperature detector that detects the blast temperature of the package unit, a blast humidity detector that detects the blast humidity of the package unit, an indoor temperature detector that detects the temperature in the air-conditioned room, and the air-conditioned room. Based on temperature detection signals output from the indoor humidity detector that detects the humidity of the indoor air temperature detector and the blower temperature detector and the indoor temperature detector, respectively, a control signal for proportionally controlling the output of the heating unit is output. Blower temperature controller and indoor temperature controller, and humidity output from the blast humidity detector and the indoor humidity detector, respectively. On the basis of the detection signal, a ventilation humidity controller and an indoor humidity controller for outputting a control signal for proportionally controlling the output of the humidifying unit, and in a normal operating state, the ventilation temperature controller and the ventilation humidity. The width of the proportional band of the controller is set extremely large,
Based on temperature detection signals and humidity detection signals output from the indoor temperature detector and the indoor humidity detector, respectively, so that the air-conditioned room is maintained at the set temperature and the set humidity, the indoor temperature controller and the The indoor humidity controller performs a constant indoor temperature / humidity control that proportionally controls the outputs of the heating unit and the humidifying unit while performing start / stop control of the cooling unit, and when the cooling unit starts / stops, The blast temperature and blast humidity at that time are newly set as the set temperature and the set humidity of the blast temperature controller and the blast humidity controller, and the width of the proportional band in the blast temperature controller and the blast humidity controller is set to an extreme value. After setting it to a small value, gradually increase the width of the proportional band in the blast temperature controller and the blast humidity controller to return to the initial setting value. In this case, even if the cooling capacity of the package unit suddenly fluctuates with the start / stop of the cooling unit, the blast temperature and blast humidity at the start / stop of the cooling unit are maintained as they are, and The room humidity can be smoothly changed to the normal operating state with almost no change. As a result, it is possible to start and stop the cooling unit according to the cooling load fluctuation and the dehumidifying load fluctuation, and it is possible to realize a constant temperature and constant humidity air conditioning system capable of highly efficient operation while suppressing waste of energy.

In particular, as in the constant temperature air conditioning system according to claim 4, at the time when the cooling unit starts and stops, the increase and decrease in the cooling capacity due to the start and stop of the cooling unit are offset in the direction. If you forcibly increase or decrease the output of the heating unit, the heating unit's ability to follow changes in the cooling capacity that accompany the start and stop of the cooling unit will improve.
There is an effect that the room temperature of the air conditioning room can be further stabilized when the cooling unit starts and stops.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a constant temperature air conditioning system for realizing a constant temperature air conditioning room of about ± 1 ° C. at low cost using the package unit 10. As shown in the figure, in the constant temperature air conditioning system 1, two sets of cooling units 11 composed of a compressor 11a, a refrigeration cycle device such as a refrigerant coil (evaporator) 11b, a heating unit 12 composed of an electric heater, heated steam, etc. The processing air processed by the package unit 10 in which the humidifying unit 13 for injecting air, the blower 14, and the like are incorporated into the casing is supplied to the air conditioning room R through the air supply duct SD, and the air in the air conditioning room R is It is designed to be returned to the package unit 10 through the return air duct RD, so that the package unit 10 receives the outside air whose outside air load has been processed in advance by the outside air conditioner OAC through the outside air duct OD. Has become.

A room temperature detector 21 for detecting the room temperature and a room humidity detector 22 for detecting the room humidity (relative humidity) are installed in the air-conditioning room R, and the air supply duct SD has a package unit. A blast temperature detector 23 that detects the blast temperature in the vicinity of 10 is installed.

The temperature detection signal output from the room temperature detector 21 is input to the room temperature controller 24, and the room temperature controller 24 determines the temperature of the air conditioning room R based on the input temperature detection signal. A control signal for proportionally controlling the output of the electric heater, which is the heating unit 12, is output to the high selector 27 so that the internal temperature becomes the set temperature, and based on the output value of the heating unit 12 and the temperature detection signal, 2 Start / stop control of the cooling units 11 of the set is performed.

The humidity detection signal output from the room humidity detector 22 is input to the room humidity controller 25. Based on the input humidity detection signal, the room humidity controller 25 The steam injection amount of the humidifying unit 13 is adjusted by proportionally controlling the steam control valve 13a so that the humidity (relative humidity) in the air conditioning room R becomes the set humidity.

The temperature detection signal output from the air temperature detector 23 is input to the air temperature controller 26. The air temperature controller 26, based on the input temperature detection signal, So that the blast temperature reaches the specified temperature,
A control signal for proportionally controlling the output of the electric heater which is the heating unit 12 is output to the high selector 27.

The high selector 27 is a room temperature controller 24.
The high selector 27 is configured to select one of the control signals having a large signal value from the control signals respectively output from the blower temperature controller 26 and output the control signal to the heating unit 12. The output of the heating unit 12 is proportionally controlled according to the control signal selected by.

The blower temperature controller 26 does not only have a function of outputting a control signal in accordance with a preset fixed temperature and proportional band width, but rather has a preset temperature and proportional band width. It has a function of outputting a control signal in accordance with the changed set temperature and the width of the proportional band while changing it at any time. In the blower temperature controller 26, the maximum width of the proportional band is set as an initial set value.

Further, a start / stop control signal of the cooling unit 11 output from the room temperature controller 24 is input to the blower temperature controller 26.
At the time of starting and stopping, the set temperature is changed to the blast temperature at that time, the proportional band is changed from the initial setting value which is the maximum width to the minimum width, and then the width of the proportional band is gradually widened. By going back, the initial setting value is restored again.

As described above, during normal operation of the constant temperature air conditioning system 1, since the proportional band of the blower temperature controller 26 is set to the maximum width, the signal of the control signal output from the room temperature controller 24 is set. The value becomes larger than the signal value of the control signal output from the blower temperature controller 26, and the high selector 2
7, the control signal output from the room temperature controller 24 is output to the heating unit 12, so that the output of the heating unit 12 is proportionally controlled based on the room temperature of the air-conditioned room R.

On the other hand, immediately after the cooling unit 11 is turned on and off, the proportional band of the blast temperature controller 26 is changed to the minimum width, so that the signal value of the control signal output from the blast temperature controller 26 is changed. Becomes larger than the signal value of the control signal output from the room temperature controller 24, and the control signal output from the blast temperature controller 26 is output to the heating unit 12 by the high selector 27. Therefore, heating is performed based on the blast temperature. The output of the unit 12 will be proportionally controlled.

At the time of starting and stopping the cooling unit 11,
The blower temperature controller 26 is configured to forcibly increase or decrease the output of the heating unit 12 in a direction to offset the increase or decrease in the cooling capacity due to the start / stop of the cooling unit.

The operating state of the constant temperature air conditioning system 1 configured as described above will be described below. First, when only one of the two cooling units 11 is operating and the cooling load gradually increases,
As shown in (a), even if the output value of the heating unit 12 controlled based on the room temperature of the air conditioning room R gradually decreases and the output value of the heating unit 12 becomes 0, that is, the heating If it becomes impossible to maintain the set temperature of the air-conditioning room R even when the unit 12 is not heated at all, as shown in FIG. The cooling unit 11 is activated.

At this time, since the start / stop control signal output from the room temperature controller 24 is also input to the blower temperature controller 26, the other cooling unit is, as shown in FIGS. At the time point 11 is activated, the blast temperature controller 26
The set temperature is changed to the blast temperature at that time, and the proportional band is changed from the maximum width that is the initial setting value to the minimum width, so that the cooling capacity of the other cooling unit 11 that has been activated is offset. The output value is forcibly increased (see (a) in the figure). From this point, the heating unit 12
Will be proportionally controlled based on the blast temperature so as to maintain the changed set temperature.

As a result, the fluctuations in the blowing temperature due to the start / stop of the cooling unit 11 are immediately corrected, and the cooling unit 1
Since the blast temperature at the start / stop of 1 is reliably maintained, even if the cooling capacity of the package unit 10 suddenly changes at the start / stop of the cooling unit 11, the room temperature of the air-conditioning room R hardly changes. , The air conditioning room R is kept at a constant temperature.

After that, the blast temperature controller 26 gradually increases the proportional band up to the maximum width which is the initial setting value. Therefore, the heating unit 12 which is proportionally controlled based on the blast temperature is again in the air conditioning room. The proportional control is performed based on the room temperature of R, and the normal operation state is restored.

As described above, this constant temperature air conditioning system 1
Changes the proportional band of the blower temperature controller 26 to the minimum width at the time when the cooling unit 11 starts and stops according to the change in the cooling load, so that the indoor temperature constant control that has been performed until then is temporarily performed. By suspending and switching to the blast temperature constant control for maintaining the blast temperature at the time of starting and stopping the cooling unit 11, by gradually expanding the proportional band of the blast temperature controller 26 to the maximum width which is the initial setting value. Since the indoor temperature constant control is returned to again, even if the cooling capacity of the package unit 10 suddenly fluctuates with the start / stop of the cooling unit 11, the blast temperature at the start / stop of the cooling unit 11 is maintained as it is. The room temperature of the air-conditioning room R can be smoothly changed to the normal operating state with almost no change. Further, the width of the proportional band of the blast temperature controller 26 is gradually increased and returned to the initial setting value so that the blast temperature constant control is gradually switched to the indoor temperature constant control. Even if the cooling load in the room R fluctuates, the output of the heating unit 12 can be controlled in consideration of the cooling load fluctuation to some extent, and the temperature of the air conditioning room R accompanying the cooling load fluctuation that occurs during the switching of control. Fluctuations can be minimized. This makes it possible to start and stop the cooling unit according to the cooling load fluctuation, which was not possible with the conventional constant temperature air conditioning system that constantly controls the indoor temperature, and enables highly efficient operation with less waste of energy. A constant temperature air conditioning system can be realized.

FIG. 3 shows another embodiment. This constant temperature air conditioning system 2 realizes a constant temperature and constant humidity air conditioning room of ± 1 ° C and ± 10% at low cost by using a package unit incorporating a plurality of sets of cooling units whose number is controlled according to the cooling load. Since it basically has the same configuration as the above-mentioned constant temperature air conditioning system 1, the same components are designated by the same reference numerals, and the description thereof will be omitted.
The different components will be described in detail.

In the above-described constant temperature air conditioning system 1, the room temperature controller 24 controls the start / stop of the two cooling units 11 while detecting the cooling operation state from the detected temperature of the air conditioning room R and the output value of the heating unit 12. However, in the constant temperature air conditioning system 2, in addition to this, the dehumidifying operation state is detected and detected from the detected humidity of the air conditioning room R and the output value of the humidification unit 13 (opening degree of the steam control valve 13a). Two sets of cooling units 11 in consideration of both the cooling operation state and the dehumidifying operation state
The start / stop control of is performed.

Specifically, as shown in FIG. 3, the start / stop control signals output from the room temperature controller 24 and the room humidity controller 25 are once input to the start / stop controller 31, and this start / stop controller is used. 31 outputs the start / stop request to the cooling unit 11 based on both start / stop control signals. That is, although the heating unit 12 is not heating,
When the temperature of the air-conditioning room R exceeds the set temperature, or when the humidity of the air-conditioning room R exceeds the set humidity even though the humidifying unit 13 is not humidified, the start / stop control unit 31 transfers to the cooling unit 11. On the other hand, an operation request is output, and conversely, although the heating unit 12 is heating at the maximum capacity,
If the temperature of the air conditioning room R is below the set temperature, or if the humidity of the air conditioning room R is below the set humidity even though the humidifying unit 13 is humidifying at maximum capacity, the start / stop control unit 31
Outputs a stop request to the cooling unit 11.

In the constant temperature air conditioning system 1 described above,
When the cooling unit 11 starts and stops, the indoor temperature constant control is switched to the blower temperature constant control. However, in the constant temperature air conditioning system 2, in addition to this, the indoor humidity constant control is performed to keep the ventilation humidity (dew point temperature) constant. I am trying to switch to control.

Specifically, as shown in the figure, the dew point temperature detector 32 for detecting the dew point temperature of the blown air installed in the air supply duct SD and the dew point temperature output from the dew point temperature detector 32. Output from the dew point temperature controller 33 and the room humidity controller 25, which output a control signal for proportionally controlling the steam control valve 13a so as to maintain the dew point temperature of the blown air at the set dew point temperature based on the detection signal. And a high selector 34 for comparing the control signal output from the dew point temperature controller 33 with the control signal output from the dew point temperature controller 33 and outputting a control signal having a large signal value to the humidification unit 13. The indoor humidity constant control and the blast humidity constant control are switched.

The dew point temperature controller 33 is the blast temperature controller 2
Similarly to 6, it has a function of changing the set dew point temperature and the width of the proportional band at any time and outputting a control signal according to the changed set dew point temperature and the width of the proportional band. In the dew point temperature controller 33, The maximum width of the proportional band is set as the initial setting value.

Further, the dew point temperature controller 33 is adapted to receive the start / stop request signal of the cooling unit 11 output from the start / stop control section 31, so that the cooling unit 11 can be operated.
At the time of starting and stopping, the set dew point temperature is changed to the dew point temperature detected at that time, and the proportional band is changed from the initial setting value that is the maximum width to the minimum width. By expanding the value, the initial value is restored.

Therefore, during normal operation of the constant temperature air conditioning system 2, the blower temperature controller 26 and the dew point temperature controller 3
Since the proportional bands of 3 are both set to the maximum width, the signal values of the control signals output from the room temperature controller 24 and the room humidity controller 25 are output from the blower temperature controller 26 and the dew point temperature controller 33, respectively. The control signals output from the room temperature controller 24 and the room humidity controller 25 are output to the heating unit 12 and the humidifying unit 13 by the high selectors 27 and 34, respectively. The outputs of the heating unit 12 and the humidifying unit 13 are proportionally controlled (indoor temperature and humidity constant control) based on the room temperature and the room humidity of the air-conditioned room R.

On the other hand, immediately after the cooling unit 11 is turned on and off, since the proportional bands of the blower temperature controller 26 and the dew point temperature controller 33 are both changed to the minimum width, the blower temperature controller 26 and the dew point are set. The signal values of the control signals output from the temperature controller 33 become larger than the signal values of the control signals output from the room temperature controller 24 and the room humidity controller 25, respectively, and the air temperature is adjusted by the high selectors 27 and 34. Since the control signals output from the device 26 and the dew point temperature controller 33 are output to the heating unit 12 and the humidifying unit 13, respectively, the outputs of the heating unit 12 and the humidifying unit 13 are output based on the blowing temperature and the dew point temperature of the blowing air. Proportional control (blower temperature and humidity constant control) will be performed.

Then, the width of the proportional band of the blower temperature controller 26 and the dew point temperature controller 33 is gradually widened to return to the initial set value, so that the blower temperature and humidity constant control is gradually changed to the indoor temperature and humidity constant control. Switch to the normal operating state.

As described above, in the constant temperature air conditioning system 2, even if the cooling capacity of the package unit 10 changes abruptly due to the start / stop of the cooling unit 11, the cooling unit 1
The blast temperature and the dew point temperature (blast humidity) of the blast air at the start / stop time of 1 are maintained as they are, and the room temperature and room humidity of the air-conditioning room R hardly change and the normal operation state can be smoothly changed. At the same time, it is possible to minimize the influence of the cooling load fluctuation and the dehumidifying load fluctuation that occur during the transition. This makes it possible to start and stop the cooling unit according to the cooling load fluctuation and dehumidification load fluctuation, which was not possible with the conventional constant temperature air conditioning system that constantly controls the indoor temperature and humidity, thus reducing energy waste. It is possible to realize a constant temperature and constant humidity air conditioning system capable of highly efficient operation.

In each of the embodiments described above, the constant temperature air conditioning systems 1 and 2 using the package unit 10 in which the two sets of cooling units 11 are incorporated have been described, but the present invention is not limited to this, and, for example, the winter season. Needless to say, when there is no cooling load or dehumidifying load, it is possible to use a package unit incorporating one set of cooling units and control start / stop of one set of cooling units. Absent.

Further, in each of the above-mentioned embodiments, while changing the set temperature (set dew point temperature) and the width of the proportional band,
Blower temperature controller 2 having a function of outputting a control signal according to the changed set temperature (set dew point temperature) and the width of the proportional band
6 (dew point temperature controller 33) is used, the present invention is not limited to this, and various digital devices capable of realizing the same function can be used.

Further, in each of the above-mentioned embodiments, the external air conditioner OAC for processing the external air load is installed, but the constant temperature air conditioning system of the present invention capable of controlling the number of cooling units incorporated in the package unit is adopted. Then, it is possible to efficiently cope with changes in the load on the outside air, so that it is not always necessary to install an outside air conditioner.

Further, in the above-described embodiment, the dew point temperature of the blown air is detected to detect the blown air humidity, but the invention is not limited to this, and the humidity of the blown air can be detected. If possible, a humidity detector other than the dew point temperature detector can be used.

Further, in the above-described embodiment, by changing the width of the proportional band of the blower temperature controller 26 and the dew point temperature controller 33, the room temperature constant control (room temperature and humidity constant control) and the blower temperature constant control ( However, the present invention is not limited to this, and the indoor temperature constant control (room temperature constant humidity control) is forcibly performed when the cooling unit 11 starts and stops. After switching to constant blast temperature control (constant blast temperature and humidity control), after a certain period of time, forcedly switch from constant blast temperature control (constant blast temperature and humidity control) to constant indoor temperature control (constant indoor temperature and humidity control) It is also possible. As described above, even when the indoor temperature constant control (indoor temperature / humidity constant control) and the blast temperature constant control (blower temperature / humidity constant control) are forced to be switched, the blast temperature adjustment is performed at the start / stop of the cooling unit 11. It goes without saying that the set temperature and the set dew point temperature of the device 26 and the dew point temperature controller 33 must be changed to the blast temperature and the dew point temperature (blast humidity) at that time.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a constant temperature air conditioning system according to the present invention.

2 (a) to (d) are diagrams showing an operating state of the above constant temperature air conditioning system.

FIG. 3 is a schematic configuration diagram showing a constant temperature air conditioning system according to another embodiment.

FIG. 4 is a schematic configuration diagram showing a conventional constant temperature air conditioning system.

[Explanation of symbols]

1, 2 constant temperature air conditioning system 10 package units 11 Cooling unit 12 heating unit 13 Humidification unit 14 blower 21 Room temperature detector 22 Room humidity detector 23 Blower temperature detector 24 Room temperature controller 25 room humidity controller 26 Blower temperature controller 27,34 High selector 31 Start / Stop control unit 32 Dew point temperature detector (blast humidity detector) 33 Dew point temperature controller (blast humidity controller) R air conditioning room SD air supply duct RD return air duct OD outside air duct OAC external conditioner

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-5-66045 (JP, A) JP-A-63-34435 (JP, A) JP-A-11-101486 (JP, A) JP-A-8- 152185 (JP, A) JP 3-129236 (JP, A) JP 64-63048 (JP, A) JP 62-80442 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 11/02

Claims (4)

(57) [Claims] 1. A constant temperature air conditioning system for maintaining a temperature inside an air-conditioned room at a set temperature using a package unit having a cooling unit and a heating unit incorporated therein, and a blast temperature detector for detecting a blast temperature of the package unit, An indoor temperature detector that detects the temperature in the air-conditioned room, and a control signal for proportionally controlling the output of the heating unit based on the temperature detection signals that are output from the blower temperature detector and the indoor temperature detector, respectively. A temperature controller and an indoor temperature controller that output the air temperature, and in a normal operating state, so that the air-conditioned room is maintained at a predetermined temperature, based on a temperature detection signal output from the indoor temperature detector. , The indoor temperature controller performs a constant indoor temperature control for proportionally controlling the output of the heating unit while controlling the start / stop of the cooling unit. When the cooling unit starts and stops, the blast temperature controller heats the blast temperature controller based on a temperature detection signal output from the blast temperature detector so that the blast temperature at that time is maintained. A constant temperature air conditioning system, characterized in that after temporarily switching to a constant blast temperature control for proportionally controlling the output of the unit, it is returned to the constant indoor temperature control. 2. A constant temperature air conditioning system for maintaining a temperature inside an air-conditioned room at a set temperature by using a package unit in which a cooling unit and a heating unit are incorporated, and a blast temperature detector for detecting a blast temperature of the package unit, An indoor temperature detector that detects the temperature in the air-conditioned room, and a control signal for proportionally controlling the output of the heating unit based on the temperature detection signals that are output from the blower temperature detector and the indoor temperature detector, respectively. It is equipped with a blower temperature controller and an indoor temperature controller that output, and in a normal operating state, the width of the proportional band of the blower temperature controller is set to be extremely large and the air-conditioned room is maintained at the set temperature. As described above, the indoor temperature controller performs start / stop control of the cooling unit based on the temperature detection signal output from the indoor temperature detector. While performing constant indoor temperature control that proportionally controls the output of the heating unit, when the cooling unit starts and stops, the blast temperature at that time is newly set as the set temperature of the blast temperature controller. Along with setting the width of the proportional band in the blower temperature controller to an extremely small value, the width of the proportional band in the blower temperature controller is gradually increased and returned to the initial setting value. system. 3. A constant temperature air conditioning system for maintaining a temperature and humidity in an air-conditioned room at a set temperature using a package unit having a cooling unit, a heating unit and a humidifying unit incorporated therein. A temperature detector, a blast humidity detector that detects the blast humidity of the package unit, an indoor temperature detector that detects the temperature in the air-conditioned room, an indoor humidity detector that detects the humidity in the air-conditioned room, and the blast An air temperature controller and an indoor temperature controller that output a control signal for proportionally controlling the output of the heating unit, based on the temperature detection signals respectively output from the temperature sensor and the indoor temperature detector, and the air blower. The output of the humidifying unit based on the humidity detection signals respectively output from the humidity detector and the indoor humidity detector. Equipped with a blast humidity controller and an indoor humidity controller that output a control signal for proportionally controlling, in a normal operating condition, the width of the proportional band of the blast temperature controller and the blast humidity controller is extremely large. While being set, so that the air-conditioned room is maintained at the set temperature and the set humidity, based on the temperature detection signal and the humidity detection signal respectively output from the indoor temperature detector and the indoor humidity detector, The indoor temperature controller and the indoor humidity controller perform the indoor temperature / humidity constant control for proportionally controlling the outputs of the heating unit and the humidifying unit while controlling the start / stop of the cooling unit, and the cooling unit starts / stops. At that time, the blast temperature and blast humidity at that time are newly set as the set temperature and set humidity of the blast temperature controller and the blast humidity controller. After setting the width of the proportional band in the blast temperature controller and the blast humidity controller to be extremely small together, the initial setting value while gradually increasing the width of the proportional band in the blast temperature controller and the blast humidity controller A constant temperature air conditioning system characterized by being returned to. 4. When the cooling unit starts and stops, the output of the heating unit is forcibly increased and decreased in a direction to offset the increase and decrease in cooling capacity due to the start and stop of the cooling unit. The constant temperature air conditioning system according to claim 1, 2 or 3.