JPH11101486A - Constant temperature / humidity air conditioning control system - Google Patents

Abstract

(57) [Abstract] [Problem] To reduce the supercooling and reheating when there is no dehumidification load and to save energy. SOLUTION: When the measured indoor humidity is lower than the indoor humidity set value, the supply air temperature set value Tsp is controlled by optimization control.
To determine. Specifically, when the current performance value of the reheater is lower than the minimum performance value, the supply air temperature setting value Tsp is reduced by a predetermined value, and when the current performance value of the reheater is higher than the maximum performance value. Is the supply air temperature set value Ts
p is increased by a predetermined value. As a result, the temperature is not reduced to the temperature (Tsp shown in FIG. 7A) for the purpose of dehumidification up to the indoor humidity set value (P1 ′ shown in FIG. 7B).
-P2'1, P1 "-P2" shown in FIG. 3 (c), and eliminates supercooling and reheating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant-temperature and constant-humidity air-conditioning control system for a room such as a clean room, an art museum, and a storage room where the indoor environment is required to be at a constant temperature and humidity.

[0002]

2. Description of the Related Art In biological clean rooms such as operating rooms, experimental animal breeding rooms, and biotechnology laboratories, and industrial clean rooms, museums, and storage rooms provided in factories of the electronics industry and precision machine industry, the purpose is as follows. In addition, the indoor environment such as temperature and humidity must be kept almost constant. Therefore, for the purpose of constant temperature and constant humidity in the indoor environment, a constant temperature and constant humidity air conditioning control system that combines an air conditioner provided with a heat exchanger for cooling and a reheater is employed. In this constant temperature / humidity air conditioning control system, a supply air temperature set value for the purpose of dehumidification up to a desired humidity (target humidity) is determined, and after cooling the intake air to the supply air temperature set value,
If the humidity is insufficient, humidification is performed, and the room is kept at a constant temperature and humidity by using a reheater to reheat to a blast temperature necessary to cover the indoor load.

FIG. 8 is a diagram showing a main part of a conventional constant temperature / humidity air conditioning control system. In the figure, 1 is an air conditioner, 2 is a reheater (heating coil), 3 is a humidifier, 4 is a control device,
Reference numerals 5 and 6 denote control valves, 7 denotes an air supply temperature sensor for detecting an outlet temperature from the air conditioner 1 as an air supply temperature, 8 denotes an indoor temperature sensor arranged in the controlled room 10, and 9 denotes a controlled room 10. It is a placed indoor humidity sensor. The air conditioner 1 includes a cooling heat exchanger (cooling coil) 1-1, a blower 1-2, and a humidifier 3.
have. The control valve 5 is provided in a supply passage of cold water to the cooling heat exchanger 1-1. The control valve 6 is a reheater 2
To the hot water supply passage.

In this constant temperature / humidity air conditioning control system,
In the control device 4, an indoor temperature set value tsp, an indoor humidity set value hsp, and an air supply temperature set value Tsp for the purpose of dehumidification up to the indoor humidity set value hsp are set in advance. In this case, the control device 4 determines the supply air temperature T from the supply air temperature sensor 7.
From pv and the supply air temperature set value Tsp, a control amount for the cooling heat exchanger 1-1 for setting Tpv = Tsp is calculated (step 901 shown in FIG. 9A), and the calculated control amount is calculated. The valve opening of the control valve 5 is adjusted based on (step 902). Thus, the air taken into the air conditioner 1 is cooled, and the supply air temperature Tpv is reduced to the supply air temperature set value Tsp.

If the room humidity hpv is higher than the room humidity set value hsp, the intake air is Tpv = Tsp.
The humidity of the intake air is adjusted to the indoor humidity set value hsp (see FIG. 1).
0 (a), P1 and P2). In this case, the control device 4
Cools the intake air until Tpv = Tsp,
The cooled intake air (supply air) is reheated by the reheater 3. That is, the control device 4 controls the indoor temperature sensor 8
From the room temperature tpv and the room temperature set value tsp from
A target airflow temperature TS to the room where pv = tsp is to be calculated (step 903 shown in FIG. 9B), and from the target airflow temperature TS and the supply air temperature Tpv to the reheater 2 for setting Tpv = TS. Is calculated (step 904 shown in FIG. 9B), and the valve opening of the control valve 6 is adjusted based on the calculated control amount (step 905). Thereby, the air supply from the air conditioner 1 is reheated, and the air supply temperature Tp
v is adjusted to the target blowing temperature TS (FIG. 10A)
P2 to P3).

[0006] On the other hand, when the room humidity hpv is lower than the room humidity set value hsp, the intake air becomes Tpv = T
Dehumidification is not performed even if cooled down to sp, and the humidity of the intake air is kept low (P1 'to P2'1 shown in FIG. 10B). In this case, the control device 4
After cooling the intake air until v = Tsp, the humidifier 3
Is driven to perform humidification. That is, the control device 4 determines the indoor humidity hpv from the indoor humidity sensor 9 and the indoor humidity set value h.
From sp and hpv <hsp, it is determined that the humidity of the intake air is lower than the room humidity set value hsp, and hpv =
A humidification amount for calculating hsp is calculated (step 906 shown in FIG. 9C), and the humidifier 3 is driven based on the calculated humidification amount (step 907). Thereby, the air supply from the air conditioner 1 is humidified, and the humidity is adjusted to the indoor humidity set value hsp (P2′1 shown in FIG. 10B).
~ P2'2). Then, the control device 4 reheats the cooled and humidified air supply by the reheater control shown in FIG. 9B and adjusts it to the target air blowing temperature TS (FIG. 10B).
P2'2 shown in ~ P3 ').

The room humidity hpv is equal to the room humidity set value h.
In the case where it matches with sp, the control device 4 sets the intake air to T
After cooling until pv = Tsp (P1 ″ -P2 ″ shown in FIG. 10 (c)), it is reheated until it reaches the target ventilation temperature TS.

[0008]

However, in such a conventional constant-temperature and constant-humidity air-conditioning control system, when the supply air temperature setting value Tsp is fixed, there is no dehumidification load (mainly in winter or in the middle of winter). However, as shown in FIGS. 10 (b) and 10 (c), there is a problem that supercooling and reheating occur, and unnecessary energy is consumed.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to suppress supercooling and reheating when there is no dehumidification load, and to minimize the loss of energy consumption. It is an object of the present invention to provide a constant temperature / humidity air conditioning control system that can perform the control.

[0010]

In order to achieve such an object, a first invention (an invention according to claim 1) defines an air supply temperature set value for the purpose of dehumidification up to a desired humidity, After cooling the intake air to this supply air temperature setting value, if the humidity is insufficient, humidification shall be performed, and the reheater will be used to reheat to the blast temperature necessary to cover the indoor load. Thus, in the constant temperature / humidity air-conditioning control system that maintains the room at a constant temperature / humidity, the supply air temperature set value is optimized based on the current performance value of the reheater. According to the present invention, the supply air temperature setting value is optimized based on the current performance value of the reheater.

A second invention (an invention according to claim 2) determines an outlet temperature set value of a cooling heat exchanger for the purpose of dehumidification to a desired humidity, and cools intake air to the outlet temperature set value. After that, if the humidity is insufficient, humidification shall be performed, and the room shall be maintained at a constant temperature and humidity by using a reheater and reheating to the blast temperature necessary to cover the indoor load. In the wet air conditioning control system, the outlet temperature set value of the cooling heat exchanger is optimized based on the current performance value of the reheater. According to the present invention, the outlet temperature set value of the cooling heat exchanger is optimized based on the current performance value of the reheater.

According to a third invention (an invention according to claim 3), the supply air temperature set value is adjusted based on the current performance value of the reheater, and the adjusted supply air temperature set value and the supply air temperature are adjusted. A first candidate value for determining the performance value of the cooling heat exchanger is determined from a comparison with the actually measured value, and a performance value of the cooling heat exchanger is determined based on a comparison between the indoor humidity set value and the measured indoor humidity. A second candidate value for determining the value is determined, and the larger one of the first candidate value and the second candidate value is used as an actual command value to control the performance of the cooling heat exchanger. It was made. According to the present invention, the first candidate value obtained by comparing the set value of the supply air temperature and the actually measured value of the supply air temperature, and the second candidate value obtained by comparing the set value of the indoor humidity and the measured value of the indoor humidity are obtained. Is larger than the actual command value.

According to a fourth invention (an invention according to claim 4), the supply air temperature set value is adjusted based on the current performance value of the reheater, and the adjusted supply air temperature set value and the supply air temperature are adjusted. The first candidate value for determining the performance value of the cooling heat exchanger is determined from the comparison with the measured value, and the cooling heat exchanger is determined based on the comparison between the supply air humidity setting value and the measured actual value of the supply air humidity. A second candidate value for determining the capacity value is obtained, and the larger one of the first candidate value and the second candidate value is used as the actual command value to control the performance of the cooling heat exchanger. It is like that. According to the present invention, the first candidate value obtained from the comparison between the supply air temperature setting value and the actual measurement value of the air supply temperature is obtained from the comparison between the supply air humidity setting value and the actual measurement value of the supply air humidity. The larger one of the second candidate values is set as the actual command value.

A fifth invention (an invention according to claim 5) is to adjust the outlet temperature set value of the cooling heat exchanger based on the current performance value of the reheater, and to adjust the cooling heat exchanger after this adjustment. A first candidate value for determining the performance value of the cooling heat exchanger is determined from a comparison between the set value of the outlet temperature of the cooling heat exchanger and the actually measured value of the outlet temperature of the cooling heat exchanger. A second candidate value for determining the performance value of the cooling heat exchanger is determined from a comparison with the actually measured value, and the larger one of the first candidate value and the second candidate value is actually commanded. The value controls the performance of the cooling heat exchanger. According to the present invention, the first candidate value, the indoor humidity set value, and the actual measurement of the indoor humidity obtained from the comparison between the set value of the outlet temperature of the cooling heat exchanger and the actually measured value of the outlet temperature of the cooling heat exchanger are provided. The larger of the second candidate values obtained from the comparison with the value is set as the actual command value.

A sixth invention (an invention according to claim 6) is to adjust the outlet temperature set value of the cooling heat exchanger based on the current performance value of the reheater, and to adjust the cooling heat exchanger after this adjustment. A first candidate value for determining the performance value of the cooling heat exchanger is determined from a comparison between the set temperature of the outlet temperature of the heat exchanger and the actually measured value of the outlet temperature of the cooling heat exchanger. A second candidate value for determining the performance value of the cooling heat exchanger is determined from a comparison with the measured value of the humidity, and the larger one of the first candidate value and the second candidate value is determined. The actual command value controls the performance of the cooling heat exchanger. According to the present invention, the first candidate value, the supply air humidity setting value, and the air supply humidity obtained by comparing the outlet temperature setting value of the cooling heat exchanger with the actually measured value of the outlet temperature of the cooling heat exchanger. The larger of the second candidate values obtained from the comparison with the actual measurement value is the actual command value.

A seventh invention (an invention according to claim 7) is to adjust a supply air temperature set value or an outlet temperature set point of a cooling heat exchanger based on a current performance value of a reheater, and after this adjustment, From the comparison between the set air supply temperature and the measured air supply temperature, or the comparison between the set temperature of the outlet temperature of the cooling heat exchanger and the actual measured value of the outlet temperature of the cooling heat exchanger, the cooling heat exchanger is activated. A first candidate value for determining the capacity value is obtained, and an air supply humidity set value is determined from a comparison between the indoor humidity set value and the actually measured indoor humidity. , A second candidate value for determining the performance value of the cooling heat exchanger is determined, and the larger of the first candidate value and the second candidate value is used as the actual command value for cooling. This is to control the performance of the heat exchanger. According to the present invention, it is determined from a comparison between the set value of the supply air temperature and the actually measured value of the supply air temperature or a comparison between the set value of the outlet temperature of the cooling heat exchanger and the measured value of the outlet temperature of the cooling heat exchanger. The larger of the second candidate values obtained from the comparison between the first candidate value, the indoor humidity set value, and the measured indoor humidity, and the comparison between the set indoor humidity value and the measured indoor humidity value. Is the actual command value.

The eighth invention (the invention according to claim 8) is the third invention.
In the inventions to the seventh invention, after setting the maximum capacity setting value and the minimum capacity setting value in advance for the capacity of the reheater, if the current performance value of the reheater is lower than the minimum capacity setting value, the supply air temperature Decrease the set value or the outlet temperature setting of the cooling heat exchanger by a predetermined value.If the current capacity of the reheater exceeds the maximum capacity setting, set the supply air temperature or the outlet temperature of the cooling heat exchanger. The value is increased by a predetermined value, and in other cases, the set value of the supply air temperature or the set value of the outlet temperature of the cooling heat exchanger is not changed. According to the present invention, when the current capacity value of the reheater is less than the minimum capacity set value, the supply air temperature set value or the outlet temperature set value of the cooling heat exchanger is reduced by a predetermined value, and the current performance of the reheater is reduced. If the capacity value exceeds the maximum capacity setting value, the supply air temperature setting value or the outlet temperature setting value of the cooling heat exchanger can be increased by a predetermined value, and the supply air temperature setting value can be increased based on the current performance value of the reheater. It will be optimized.

The ninth invention (the invention according to claim 9) is the third invention.
In the inventions to the seventh invention, the reheater is composed of a plurality of individual reheaters, and a maximum capacity setting value and a minimum capacity setting value are set in advance for the capacity of each individual reheater,
If there is at least one individual reheater whose output capacity value is lower than the minimum capacity setting value, the supply air temperature setting value or the outlet temperature setting value of the cooling heat exchanger is reduced by a predetermined value, and the output capacity value becomes the minimum capacity setting value. If there is no individual reheater below the set value and if there is at least one individual reheater whose output capacity value exceeds the maximum capacity set value, the supply air temperature set value or the outlet temperature set value of the cooling heat exchanger Is raised by a predetermined amount,
In other cases, the set value of the supply air temperature or the set value of the outlet temperature of the cooling heat exchanger is not changed.
According to the present invention, if there is at least one individual reheater having the lowering capability value than the minimum capability setting value, the supply air temperature setting value or the outlet temperature setting value of the cooling heat exchanger is reduced by a predetermined value. If there is no individual reheater whose capacity value is lower than the minimum capacity setting value, and if there is at least one individual reheater whose output capacity value exceeds the maximum capacity setting value, the supply air temperature setting value or cooling heat The set value of the outlet temperature of the exchanger is raised by a predetermined value, and even when there are a plurality of controlled rooms, the set value of the supply air temperature is optimized based on the current performance value of the reheater.

The tenth invention (the invention according to claim 10) is:
In the third invention to the seventh invention, the reheater is constituted by a plurality of individual reheaters, and a maximum capacity set value and a minimum capacity set value are set in advance for the capacity of each individual reheater, and the output capacity value is minimized. If at least one individual reheater is lower than the capacity setting value, the supply air temperature setting value or the outlet temperature setting value of the cooling heat exchanger is reduced by a predetermined value, and the individual reheater whose output capacity value is lower than the minimum capacity setting value If there are no units, and the individual reheater whose output capacity value exceeds the maximum capacity setting value occupies the majority of the individual reheaters, the supply air temperature setting value or the outlet temperature setting value of the cooling heat exchanger Is increased by a predetermined value, and in other cases, the set value of the supply air temperature or the set value of the outlet temperature of the cooling heat exchanger is not changed. According to the present invention, if there is at least one individual reheater having the lowering capability value than the minimum capability setting value, the supply air temperature setting value or the outlet temperature setting value of the cooling heat exchanger is reduced by a predetermined value. 1 individual reheater whose capacity value is below the minimum capacity setting value
When there are no units, the supply air temperature setting value or the outlet temperature setting value of the cooling heat exchanger is predetermined if the individual reheater whose output capacity value exceeds the maximum capacity setting value occupies a majority of the entire individual reheater. Even if the value is increased and there are a plurality of controlled rooms, the supply air temperature set value is optimized based on the current performance value of the reheater. In this case, even if irregularity occurs in a small number of individual reheaters, it does not affect the whole. Thereby, supercooling and reheating when there is no dehumidifying load can be suppressed, and loss of consumed energy can be suppressed as much as possible.

An eleventh invention (an invention according to claim 11) is:
In the third invention to the seventh invention, only when the actual measured value of the indoor humidity is higher than the indoor humidity set value, the supply air temperature set value or the outlet temperature set value of the cooling heat exchanger is set to the current actually measured value. It was made. According to a twelfth invention (an invention according to claim 12), in the third invention to the seventh invention, only when the measured value of the supply air humidity is higher than the supply air humidity set value, the supply air temperature set value or the cooling heat According to the eleventh and twelfth aspects of the present invention, the outlet temperature set value of the exchanger is set to the present actually measured value. The value is the current measured value.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. [Embodiment 1] In this embodiment, the system configuration is the same as the conventional one shown in FIG. 8, but the function of the control device 4 is different. The control device in this case is 4
It is shown as −1 to distinguish it from the control device 4. Control device 4-1
Calculates the first candidate value and the second candidate value when adjusting the valve opening of the control valve 5 with respect to the cooling heat exchanger 1-1, and determines the larger one of the first and second candidate values as the actual command value. And

[Calculation of First Candidate Value] In calculating the first candidate value, first, the supply air temperature set value is determined by the supply air temperature optimization control (step 20 shown in FIG. 2).
1). FIG. 3 shows a flowchart of the supply air temperature optimization control.

In the supply air temperature optimization control, the valve opening of the control valve 6 with respect to the reheater 2 is checked once at a predetermined time interval (step 201-1). That is,
The current performance value of the reheater 2 is checked. Then, it is checked whether or not the valve opening of the control valve 6 is smaller than the minimum opening set value (step 201-2). If the valve opening is smaller than the minimum opening set value, it is determined that the cooling heat is insufficient. Then, the air supply temperature set value is lowered by the air supply set value change width (step 201-3).

If the valve opening of the control valve 6 is not smaller than the minimum opening set value, it is checked whether or not it is larger than the maximum opening set value (step 201-4). If so, it is determined that the cold heat is excessively supplied, and the supply air temperature set value is increased by the air supply set value change width (step 201-5).

If the valve opening of the control valve 6 is between the minimum opening setting value and the maximum opening setting value, step 201
Step 201- in response to NO of -2 and 201-4
The program proceeds to 6, and the set value of the supply air temperature is maintained as it is. The reason why the valve opening is first compared with the minimum opening set value and then compared with the maximum opening setting value is that the reheater 2 can increase the temperature but cannot decrease it. In order to avoid falling into a situation where it must be lowered.

After the supply air temperature set value is determined in this way, the supply air temperature dehumidification compensation control (step 20 shown in FIG. 2)
According to 2), the supply air temperature set value determined in step 201 is directly used as the supply air temperature set value Tsp, or the actual measured supply air temperature at that time is replaced with the supply air temperature set value determined in step 201, and the supply air temperature setting is performed. It is determined whether the value is Tsp.
FIG. 4 shows a flowchart of the supply air temperature dehumidification compensation control.

In the supply air temperature dehumidification compensation control, the indoor humidity hpv is compared with the indoor humidity set value hsp (step 202-1). If hpv ≦ hsp, it is determined that there is no need for dehumidification. 2, the supply air temperature set value (A) determined in step 201 is directly used as the supply air temperature set value Tsp, whereas hpv> h
sp, it is determined that dehumidification is necessary, and step 2 is performed.
The process proceeds to 02-3, and the measured supply air temperature at that time is set as the supply air temperature set value Tsp. The reason why the actually measured supply air temperature is set to the supply air temperature set value Tsp in step 202-3 will be described later.

Then, from the supply air temperature Tpv and the supply air temperature set value Tsp, a control amount to the cooling heat exchanger 1-1 for setting Tpv = Tsp is calculated (step 2 shown in FIG. 2).
03), a command value of the valve opening degree to the control valve 5 based on the calculated control amount is output as a first candidate value S1. The first candidate value S1 is a control amount for setting the supply air temperature Tpv to the supply air temperature set value Tsp.

[Calculation of second candidate value] The second candidate value is calculated from the room humidity hpv and the room humidity set value hsp.
That is, the indoor humidity hpv is compared with the indoor humidity set value hsp (step 204). If hpv> hsp, it is determined that dehumidification is necessary, and the routine proceeds to step 205. In step 205, the indoor humidity hpv and the indoor humidity set value hsp
Therefore, the cooling heat exchanger 1 for setting hpv = hsp
The control amount to −1 is calculated, and the command value of the valve opening to the control valve 5 based on the calculated control amount is output as the second candidate value S2. This second candidate value S2 is the indoor humidity hpv
Is a control amount for setting the indoor humidity set value hsp.

The first candidate value S calculated as described above
1 and the second candidate value S2 are compared in step 206. The larger one of the candidate values S1 and S2 is set as the actual command value, and the valve opening of the control valve 5 with respect to the cooling heat exchanger 1-1 is adjusted by the actual command value. (Step 207). If hpv <hsp in step 204, the supply air temperature is set to the supply air temperature set value T.
After cooling to sp, humidification control is performed in the same manner as shown in FIG.

Here, the second candidate value S2 obtained when hpv> hsp is generally larger than the first candidate value S1. In other words, when it is necessary to dehumidify,
The second candidate value S2 is set as the actual command value, and the supply air temperature Tpv is hpv = hs regardless of the supply air temperature setting value Tsp at that time.
It is lowered until it becomes p.

On the other hand, when hpv ≦ hsp, the second candidate value S2 is set to 0. Therefore, when the humidity needs to be satisfied or humidification is required, the first candidate value S1 is set as the actual command value, and the supply air temperature Tpv is reduced to the supply air temperature set value Tsp determined through steps 201 and 202. In this case, since the supply air temperature setting value Tsp is optimized based on the performance capability value of the reheater 2 at that time, the supply air temperature Tpv is set to the supply air temperature for the purpose of dehumidification up to the indoor humidity setting value hsp ( Without being reduced to Tsp) shown in FIG. 10, supercooling reheating is suppressed, and loss of energy consumption is minimized.

That is, in this embodiment, the room humidity h
When pv is higher than the indoor humidity set value hsp, the intake air is cooled to a temperature for dehumidification up to the indoor humidity set value hsp (P1 and P2 shown in FIG. 1A). On the other hand, when the room humidity hpv is lower than the room humidity set value hsp, the supply air temperature set value Tsp is determined by the optimization control, so that the room humidity set value hs
The temperature is not lowered to the temperature for dehumidification up to p (P1 'to P2'1 shown in FIG. 1B). Here, FIG.
As can be seen by comparing FIG. 10B with FIG. 10B, in this embodiment, supercooling and reheating as shown by the thick line in FIG. 1B is eliminated, and energy saving is achieved.

The indoor humidity hpv is equal to the indoor humidity set value h.
Even when the air temperature matches the air temperature sp, the supply air temperature set value Tsp is determined by the optimization control, so that the temperature is not lowered to the temperature for the purpose of dehumidification up to the indoor humidity set value hsp (FIG. 1 ( P1 "-P2" shown in c)).
Here, as can be seen by comparing FIG. 1 (c) and FIG. 10 (c), in this embodiment, supercooling and reheating as shown by the thick line in FIG. 1 (c) is eliminated, and energy saving is achieved. .

[Reason for setting the measured supply air temperature to the supply air temperature set value at the time of dehumidification] In step 202-3, the actually measured supply air temperature is set to the supply air temperature set value Tsp so that the temperature / humidity control at the time of canceling the dehumidification request is canceled. Disturbance can be minimized.
In step 202-3, the measured supply air temperature is set to the supply air temperature set value T.
It is assumed that the set value of the supply air temperature determined in step 201 is used as it is as the set value of the supply air temperature Tsp without setting it as sp. Then, when the dehumidification request is canceled, the measured supply air temperature and the supply air temperature set value T
sp greatly deviates, and the temperature / humidity control is disturbed. Therefore, during the dehumidification using the second candidate value S2, the actual supply air temperature and the supply air temperature set value Tsp do not greatly differ from each other when the dehumidification request is released by the second candidate value S2. The supply air temperature is set to a supply air temperature set value Tsp.

It should be noted that a method of making the supply air temperature setting value Tsp equal to the supply air dew point temperature setting value (for example, 12 ° C.) taking dehumidification into consideration during dehumidification using the second candidate value S2 is also conceivable. In this case, when the room humidity is satisfied while the supply air temperature is lowered to 12 ° C., the supply air temperature set value is 12
Since the temperature is in ° C., a sudden change in the supply air temperature set value occurs and control is disturbed. In order to prevent this, when dehumidification is released, the measured value of the supply air temperature and the set value must be equal, and the set value of the supply air temperature at that time (= actual measurement value)
It is necessary to perform supply air temperature comfort control.

[Second Embodiment] In the first embodiment, in step 204, the room humidity hpv and the room humidity set value h
The air supply dew point temperature sensor 11 is provided as shown by a dotted line in FIG. 8, and the air supply dew point temperature detected by the air supply dew point temperature sensor 11 and the air supply dew point temperature set value are compared with each other. The necessity of dehumidification may be determined by comparing. In this way, the necessity of dehumidification is determined by comparing the measured value of the supply air humidity with the set value of the supply air humidity, and the responsiveness is high and the accuracy is high. [Third Embodiment] Further, a supply air dew point temperature set value is calculated by PID calculation from the indoor humidity hpv and the indoor humidity set value hsp, and the supply air dew point temperature set value and the air supply dew point temperature sensor 10 detect the supply air dew point. The necessity of dehumidification may be determined by comparing with the dew point temperature.

[Fourth Embodiment] In the first embodiment, an air supply temperature set value is determined for the air supply temperature from the air conditioner 1, and the air supply temperature set value is optimized and controlled. However, an outlet temperature set value may be determined for the outlet temperature of the cooling heat exchanger 1-1, and the outlet temperature set value may be optimized and controlled. In this case, in each of the flowcharts shown in FIGS. 2, 3, and 4, it is possible to cope only by replacing the supply air temperature with the outlet temperature. In particular, when the air conditioner 1 is provided with a heating heat exchanger (heating coil), that is, when the air conditioner 1 is used for both cooling and warming, the cooling heat exchanger 1-1 is replaced with the supply air temperature. It is better to use the outlet temperature. The air supply temperature sensor is easily attached to the air supply duct, but the sensor for measuring the outlet temperature of the cooling heat exchanger must be installed in the air conditioner, and may not be installed depending on the air conditioner.

[Fifth Embodiment] In the first embodiment, the controlled room 10 is described as one for the sake of simplicity. However, the number of the controlled rooms 10 is usually plural. . In this case, a reheater 2, a humidifier 3 and a control valve 6 are provided for each controlled room 10 as shown in FIG. The supply air temperature optimization control is performed according to the flowchart shown in FIG.

In the supply air temperature optimizing control, the valve openings of the control valves 6-1 to 6-n for the reheaters 2-1 to 2-n are checked once at a predetermined time interval (step 601). That is, the current performance values of the reheaters 2-1 to 2-n are checked. Then, it is checked whether the valve opening is below the minimum opening set value or not (step 602). If any valve opening is below the minimum opening set value, it is determined that the cooling heat is insufficient. To lower the air supply temperature set value by the air supply set value change width (step 60).
3).

If there is no valve opening that is smaller than the minimum opening set value, it is checked whether there is any valve opening that exceeds the maximum opening set value (step 604). If there is any excess, it is determined that the cold heat is excessively supplied, and the supply air temperature set value is increased by the supply air set value change width (step 605).

If the valve opening of the control valves 6-1 to 6-n is between the minimum opening setting value and the maximum opening setting value, step 60 is performed in accordance with NO in steps 602 and 604.
The program proceeds to 6, and the set value of the supply air temperature is maintained as it is.

[Sixth Embodiment] FIG. 7 shows another example of the supply air temperature optimization control in the fifth embodiment. In this supply air temperature optimization control, step 604 shown in FIG. 6 is set to 604 ', and it is checked whether or not the valve opening exceeds the maximum opening set value occupies the majority. If the majority exceeds the maximum opening set value, it is determined that the cold heat is excessively supplied, and the supply air temperature set value is increased by the air supply set value change width (step 605).

In each of the above-described embodiments, the reheater (reheater) 2 is basically the same as the heating exchanger, and when the air conditioner 1 has no heating heat exchanger (heating coil), The reheater 2 can be used for heating.
There are various types of reheaters such as an electric reheater, a hot water reheater, and a steam reheater, and any of them may be used. Further, in FIG. 5, the humidifier 3 does not necessarily have to be placed after the reheater 2 and may be placed in the air conditioner 1. Further, the room humidity and the supply air humidity include relative humidity, absolute humidity, dew point temperature, and the like.

Since the constant-temperature and constant-humidity air conditioning is basically a continuous operation for 24 hours, it is necessary to set a supply air temperature at the initial stage. For that purpose, the supply air dew point temperature is obtained from the set value of the indoor humidity, and this is set as the supply air temperature set value. After the start of operation, the supply air temperature set value changes according to the present invention.

[0046]

As is apparent from the above description, according to the present invention, in the first invention, the supply air temperature set value is optimized based on the current performance value of the reheater, and the dehumidification load is reduced. In this case, it is possible to suppress supercooling and reheating when there is no exhaust gas, and to suppress the loss of energy consumption as much as possible.
In this case, since the supply air temperature sensor is attached to the air supply duct, the attachment is easy (the outlet temperature sensor of the cooling heat exchanger may not be able to be installed in the air conditioner). In the second invention, the outlet temperature set value of the cooling heat exchanger is optimized based on the current performance value of the reheater, suppressing supercooling and reheating when there is no dehumidification load, and reducing energy consumption. Loss can be reduced as much as possible. In this case, since the outlet temperature of the cooling heat exchanger is taken, the controllability is good.

In the third invention, the first candidate value obtained by comparing the set value of the supply air temperature and the actually measured value of the supply air temperature is obtained by comparing the set value of the indoor humidity and the measured value of the indoor humidity. The larger of the second candidate values is set as the actual command value, and the performance of the cooling heat exchanger is controlled. In this case, supercooling and reheating when there is no dehumidification load can be suppressed, and loss of energy consumption can be suppressed as much as possible. Further, since the supply air temperature sensor is attached to the supply air duct, the attachment is easy. Further, even when the latent heat load in the room changes, the room humidity can be controlled to the set value. According to the fourth aspect, the first supply air temperature is determined by comparing the supply air temperature set value with the actually measured air supply temperature.
The larger of the second candidate values obtained from the comparison between the candidate value, the supply air humidity setting value, and the actual measurement value of the air supply humidity is set as the actual command value, and the performance of the cooling heat exchanger is controlled. You. In this case, supercooling and reheating when there is no dehumidification load can be suppressed, and loss of energy consumption can be suppressed as much as possible. Further, since the supply air temperature sensor is attached to the supply air duct, the attachment is easy. In addition, since the supply air humidity is close to that of the cooling heat exchanger, the response is fast and the accuracy is high.

According to the fifth invention, the first candidate value, the indoor humidity set value, and the indoor humidity obtained by comparing the set value of the outlet temperature of the cooling heat exchanger with the actually measured value of the outlet temperature of the cooling heat exchanger. The larger one of the second candidate values obtained from the comparison with the actual measurement value is set as the actual command value, and the performance of the cooling heat exchanger is controlled. In this case, supercooling and reheating when there is no dehumidification load can be suppressed, and loss of energy consumption can be suppressed as much as possible. Further, since the outlet temperature of the cooling heat exchanger is used, controllability is good. Further, even when the latent heat load in the room changes, the room humidity can be controlled to the set value. In the sixth invention, the first candidate value, the supply air humidity setting value, and the supply air humidity are determined by comparing the outlet temperature setting value of the cooling heat exchanger with the actually measured value of the outlet temperature of the cooling heat exchanger. The larger of the second candidate values obtained from the comparison with the actually measured value is set as the actual command value, and the performance of the cooling heat exchanger is controlled. In this case, supercooling and reheating when there is no dehumidification load can be suppressed, and loss of energy consumption can be suppressed as much as possible. Further, since the outlet temperature of the cooling heat exchanger is used, controllability is good. In addition, since the supply air humidity is close to that of the cooling heat exchanger, the response is fast and the accuracy is high.

In the seventh invention, the comparison between the set value of the supply air temperature and the measured value of the supply air temperature or the comparison between the set value of the outlet temperature of the cooling heat exchanger and the measured value of the outlet temperature of the cooling heat exchanger is performed. Among the first candidate values obtained, the room humidity set values, and the second candidate values obtained from the comparison between the room humidity set values determined from the comparison between the measured indoor humidity values and the measured room humidity values. The larger value is set as the actual command value, and the ability of the cooling heat exchanger to be exerted is controlled. In this case, supercooling and reheating when there is no dehumidification load can be suppressed, and loss of energy consumption can be suppressed as much as possible. Further, if the first candidate value is obtained from a comparison between the set value of the supply air temperature and the actually measured value of the supply air temperature,
Since the air supply temperature sensor is attached to the air supply duct, installation becomes easy, and the first temperature is obtained from a comparison between the set value of the outlet temperature of the cooling heat exchanger and the actually measured value of the outlet temperature of the cooling heat exchanger.
Is determined, the controllability is improved because the outlet temperature of the cooling heat exchanger is used. Further, even when the latent heat load in the room changes, the room humidity can be controlled to the set value. In addition, since the supply air humidity is close to that of the cooling heat exchanger, the response is fast and the accuracy is high.

In the eighth aspect of the invention, if the current capacity of the reheater is lower than the minimum capacity set value, the supply air temperature set value or the outlet temperature set value of the cooling heat exchanger is reduced by a predetermined value, and the current value of the reheater is reduced. If the output capacity value exceeds the maximum capacity setting value, the supply air temperature setting value or the outlet temperature setting value of the cooling heat exchanger can be increased by a predetermined value, and the supply air temperature setting value It will be optimized based on this. Thereby, supercooling and reheating when there is no dehumidifying load can be suppressed, and loss of consumed energy can be suppressed as much as possible. In the ninth invention, if there is at least one individual reheater whose output capacity value is lower than the minimum capacity set value, the supply air temperature set value or the outlet temperature set value of the cooling heat exchanger is reduced by a predetermined value, and the output capacity is reduced. If there is no individual reheater whose value is lower than the minimum capacity setting value, and if there is at least one individual reheater whose performance value exceeds the maximum capacity setting value, the supply air temperature setting value or cooling heat exchange The outlet temperature set value of the vessel is raised by a predetermined value, and even when there are a plurality of controlled chambers, the supply air temperature set value is optimized based on the current performance value of the reheater. This suppresses supercooling and reheating when there is no dehumidification load,
It is possible to minimize the loss of energy consumption as much as possible.

In the tenth aspect, if at least one of the individual reheaters has a lowering capability value than the minimum capability setting value, the supply air temperature setting value or the outlet temperature setting value of the cooling heat exchanger is reduced by a predetermined value. If there is no individual reheater whose output capacity value is lower than the minimum capacity setting value, and if the individual reheater whose output performance value exceeds the maximum capacity setting value occupies a majority of the entire individual reheaters, supply is performed. The air temperature setting value or the outlet temperature setting value of the cooling heat exchanger is raised by a predetermined value, and even when there are multiple controlled rooms, the supply air temperature setting value is optimized based on the current performance value of the reheater. Becomes In this case, even if irregularity occurs in a small number of individual reheaters, it does not affect the whole. Thereby, supercooling and reheating when there is no dehumidifying load can be suppressed, and loss of consumed energy can be suppressed as much as possible.
In the eleventh and twelfth inventions, at the time of dehumidification, the set value of the supply air temperature or the set value of the outlet temperature of the cooling heat exchanger is set as the current actually measured value. Can be minimized.

[Brief description of the drawings]

FIG. 1 is an air-conditioning diagram for explaining the operation of a constant-temperature and constant-humidity air-conditioning control system according to the present invention.

FIG. 2 is a flowchart for explaining dehumidification control in the constant temperature / humidity air conditioning control system according to the present invention.

FIG. 3 is a flowchart for explaining supply air temperature optimization control in the constant temperature / humidity air conditioning control system according to the present invention.

FIG. 4 is a flowchart for explaining supply air temperature dehumidification compensation control in the constant temperature / humidity air conditioning control system according to the present invention.

FIG. 5 is a diagram showing a main part of a constant temperature / humidity air conditioning control system according to the present invention when there are a plurality of controlled rooms.

FIG. 6 is a diagram for explaining supply air temperature optimization control in the constant temperature / humidity air conditioning control system.

FIG. 7 is a diagram illustrating another example of supply air temperature optimization control in the constant temperature / humidity air conditioning control system.

FIG. 8 is a diagram showing a main part of a constant temperature / humidity air conditioning control system according to the related art and the present invention.

FIG. 9 is a flowchart for explaining the operation of the conventional constant temperature / humidity air conditioning control system.

FIG. 10 is an air conditioning diagram for explaining the operation of a conventional constant temperature / humidity air conditioning control system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Air conditioner, 1-1 ... Heat exchanger for cooling, 1-2 ... Blower, 2 ... Reheater (heating coil), 3 ... Humidifier, 4-1
... Control device, 5, 6 ... control valve, 7 ... supply air temperature sensor, 8
... indoor temperature sensor, 9 ... indoor humidity sensor, 10 ... controlled room, 11 ... supply air dew point temperature sensor.

Claims (12)

[Claims] 1. An air supply temperature set value for the purpose of dehumidification up to a desired humidity is determined, and after cooling the intake air to the air supply temperature set value, humidification is performed if the humidity is insufficient. The reheater is used to reheat the room to the required blast temperature to cover the indoor load.
A constant-temperature and constant-humidity air-conditioning control system that maintains constant humidity, comprising: a supply-air temperature set value optimizing unit that optimizes the supply-air temperature set value based on a current performance value of the reheater. Constant humidity air conditioning control system. 2. An outlet temperature set value of a cooling heat exchanger for the purpose of dehumidifying to a desired humidity is determined, and after cooling the intake air to the outlet temperature set value, when the humidity is insufficient. In the constant-temperature and constant-humidity air-conditioning control system that keeps the room at a constant temperature and a constant humidity by reheating to the blast temperature necessary to cover the indoor load using the reheater, A constant temperature / humidity air conditioning control system, characterized in that it comprises an outlet temperature set value optimizing means for optimizing the reheater based on the present performance value of the reheater. 3. A cooling heat exchanger for cooling intake air to a supply air temperature setting value, and an air-conditioning load of a room controlled by the air-conditioning controlled air cooled by the cooling heat exchanger. A reheater that reheats to the blast temperature, a blower that sends the conditioned air to the air-conditioned room, and an air supply after adjusting the air supply temperature set value based on the current performance value of the air heater. From the comparison between the temperature set value and the actually measured supply air temperature, a first candidate value for determining the performance value of the cooling heat exchanger is determined, and the comparison between the indoor humidity set value and the actually measured indoor humidity is performed. A second candidate value for determining the performance value of the cooling heat exchanger is obtained, and the larger one of the first candidate value and the second candidate value is set as an actual command value as the actual command value. And a control device for controlling the performance of the heat exchanger. A constant temperature and humidity controlled air conditioning control system. 4. A cooling heat exchanger for cooling the intake air to a supply air temperature setting value, and an air-conditioning load of a room controlled by the air-conditioning controlled air cooled by the cooling heat exchanger. A reheater that reheats to the blast temperature, a blower that sends the conditioned air to the air-conditioned room, and an air supply after adjusting the air supply temperature set value based on the current performance value of the air heater. From the comparison between the temperature set value and the actually measured supply air temperature, a first candidate value for determining the performance value of the cooling heat exchanger is determined, and the first supply value and the actually measured supply air humidity are determined. A second candidate value for determining the performance value of the cooling heat exchanger is determined from the comparison, and the larger one of the first candidate value and the second candidate value is set as the actual command value. A control device for controlling the performance of the cooling heat exchanger. A constant temperature and humidity controlled air conditioning control system. 5. A cooling heat exchanger for cooling intake air to an outlet temperature set value of the cooling heat exchanger, and an air conditioning load of a room in which air cooled by the cooling heat exchanger is air-conditioned. A reheater that reheats to a blast temperature necessary to cover the air; a blower that sends conditioned air to a room to be air-conditioned; and an outlet temperature set value of the cooling heat exchanger based on a current performance value of the reheater. After the adjustment, a first performance value of the cooling heat exchanger is determined from a comparison between the adjusted outlet temperature setting value of the cooling heat exchanger and the actually measured outlet temperature of the cooling heat exchanger. Along with obtaining the candidate value, a second candidate value for determining the performance value of the cooling heat exchanger is determined from a comparison between the indoor humidity set value and the actually measured indoor humidity value,
A control device for controlling the performance of the cooling heat exchanger using the larger one of the first candidate value and the second candidate value as an actual command value. Constant humidity air conditioning control system. 6. A cooling heat exchanger for cooling intake air to an outlet temperature set value of the cooling heat exchanger, and an air conditioning load of a room in which air cooled by the cooling heat exchanger is air-conditioned. A reheater that reheats to a blast temperature necessary to cover the air; a blower that sends conditioned air to a room to be air-conditioned; and an outlet temperature set value of the cooling heat exchanger based on a current performance value of the reheater. After the adjustment, a first performance value of the cooling heat exchanger is determined from a comparison between the adjusted outlet temperature setting value of the cooling heat exchanger and the actually measured outlet temperature of the cooling heat exchanger. Along with obtaining the candidate value, a second candidate value for determining the performance value of the cooling heat exchanger is determined from a comparison between an air supply humidity set value and an actually measured air supply humidity value,
A control device for controlling the performance of the cooling heat exchanger using the larger one of the first candidate value and the second candidate value as an actual command value. Constant humidity air conditioning control system. 7. A cooling heat exchanger for cooling the intake air to a supply air temperature setting value or an outlet temperature setting value of the cooling heat exchanger, and the air cooled by the cooling heat exchanger is air-conditioned. A reheater that reheats to a blast temperature necessary to cover the air conditioning load of the room, a blower that sends conditioned air to a room that is controlled by air conditioning, and the supply air temperature set value based on the current capacity of the reheater. Or, adjust the outlet temperature set point of the cooling heat exchanger, and then compare the adjusted supply air temperature set point with the actual measured air supply temperature or the outlet temperature set point of the cooling heat exchanger and the cooling heat. A first candidate value for determining the performance value of the cooling heat exchanger is determined from a comparison with a measured value of the outlet temperature of the exchanger, and air supply is determined based on a comparison between the measured indoor humidity value and the measured indoor humidity value. Set the humidity set value, and set the supply air humidity A second candidate value for determining the performance value of the cooling heat exchanger is determined from a comparison with an actually measured value, and the larger one of the first candidate value and the second candidate value is determined. A control device for controlling the ability of the cooling heat exchanger to perform as a command value. 8. The method according to claim 3, wherein
After setting the maximum capacity setting value and the minimum capacity setting value in advance for the capacity of the reheater, if the current performance value of the reheater is lower than the minimum capacity setting value, the supply air temperature setting value or the The outlet temperature set value of the cooling heat exchanger is lowered by a predetermined value, and if the current performance value of the reheater is higher than the maximum capacity set value, the supply air temperature set value or the outlet temperature setting of the cooling heat exchanger is set. A constant-temperature and constant-humidity air-conditioning control system characterized in that the value is increased by a predetermined value, and in other cases, the set value of the supply air temperature or the set value of the outlet temperature of the cooling heat exchanger is not changed. 9. The method according to claim 3, wherein
The reheater is composed of a plurality of individual reheaters, and a maximum capacity set value and a minimum capacity set value are set in advance for the capacity of each individual reheater, and the individual capacity of the individual reheater is smaller than the minimum capacity set value. If there is at least one reheater, the supply air temperature setting value or the outlet temperature setting value of the cooling heat exchanger is lowered by a predetermined value, and if there is no individual reheater whose output capacity value is less than the minimum capacity setting value If there is at least one individual reheater whose output capacity value exceeds the maximum capacity set value, the supply air temperature set value or the outlet temperature set value of the cooling heat exchanger is raised by a predetermined value. A constant-temperature and constant-humidity air-conditioning control system, wherein an air temperature set value or an outlet temperature set value of the cooling heat exchanger is not changed. 10. The apparatus according to claim 3, wherein the reheater is constituted by a plurality of individual reheaters, and a maximum capacity setting value and a minimum capacity setting value are set in advance for the capacity of each individual reheater. In advance, if at least one individual reheater has a lowering capacity value than the minimum capacity setting value, the supply air temperature setting value or the outlet temperature setting value of the cooling heat exchanger is reduced by a predetermined value. If there is no individual reheater whose value is below the minimum capacity setting value and the individual reheater whose output capacity value exceeds the maximum capacity setting value occupies the majority of the individual reheaters, the supply air temperature setting Value or the outlet temperature set value of the cooling heat exchanger is increased by a predetermined value, otherwise, the supply air temperature set value or the outlet temperature set value of the cooling heat exchanger is not changed. Constant temperature and humidity air-conditioning control system for the butterflies. 11. The air supply temperature set value or the outlet temperature of the cooling heat exchanger according to any one of claims 3 to 7, only when the measured indoor humidity value exceeds the indoor humidity set value. A constant-temperature and constant-humidity air-conditioning control system wherein a set value is set to a currently measured value. 12. The air supply temperature setting value or the cooling heat exchanger according to claim 3, wherein the air supply humidity set value or the cooling heat exchanger is set only when the measured air supply humidity value exceeds the air supply humidity set value. A constant-temperature and constant-humidity air-conditioning control system characterized in that an outlet temperature set value is set to a currently measured value.