JPH1163631A - Equipment for controlling temperature of supply water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve COP(coefficient of performance: a ratio between the power consumed for producing chilled-hot water and the quantity of heat generated) of a heat source unit and thereby to save energy. SOLUTION: The status of an air conditioner is determined by each of air conditioner controllers 4-1-4-n on the basis of a state of valve travel of a chilled water valve, a state of valve travel of a hot water valve, a temperature deviation of supply air, a situation of convergence of this temperature deviation of supply air and indoor humidity, and sent to heat source controllers 8-1 and 8-2. The heat source controller 8-1 determines a chilled water temperature control signal (overall state of supply water) on the basis of the status of the air conditioner sent thereto and determines a set value variation range ΔTC (up range ΔTCU, down range ΔTCD) for the present set supply water temperature TCSP according to this chilled water temperature control signal. The heat source controller 8-2 determines a hot water temperature control signal (overall state of supply water) on the basis of the status of the air conditioner sent thereto and determines a set value variation range ΔTH (up range ΔTHU, down range ΔTHD) for the present set supply water temperature THsp according to this hot water temperature control signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply temperature control device for controlling a water supply temperature of a heat medium in an air conditioning control system using cold and hot water as a heat medium.

[0002]

2. Description of the Related Art Conventionally, in an air-conditioning control system using cold and hot water as a heat medium, the temperature at which the heat medium is sent to an air conditioner is controlled to be constant (generally 5 to 7 ° C.).
That is, even if the load on the air conditioner increases or decreases, the water supply temperature does not change. When the load of the air conditioner increases or decreases, the degree of opening of the control valve attached to the air conditioner is increased or decreased, and the amount of cold or hot water to the air conditioner is increased or decreased.

[0003]

However, in such water supply temperature constant control, when the load on the air conditioner is low, the water supply temperature required to cover the amount of heat actually consumed by the air conditioner is reduced. As a result, the water supply temperature becomes excessive, and the COP (coefficient of performance: the ratio between the power consumption for generating cold and hot water and the amount of generated heat) of the heat source units (cooling and heating unit) decreases.
There was a problem that energy was wasted. For example, during cooling, if the load on the air conditioner is low,
The water supply temperature is low, the return water temperature is low, and the CO
P decreases and energy is wasted. That is, in this case, if the water supply temperature is increased, the return water temperature is also increased, and although the COP of the cold heat source unit can be improved, this is not performed, so that energy is wasted.

[0004] Also, in a district cooling and heating system (DHC) or a heat storage tank system, when the load of the air conditioner is low, the water supply temperature becomes excessive, and the return water temperature (2 of the heat exchanger).
The secondary return temperature of the heat exchanger is kept above a certain value (at the time of cooling) or below a certain value (at the time of heating) because the temperature of the secondary return water is low in cooling and high in heating. It is difficult to maintain the temperature difference on the primary side of the heat exchanger constant. In a DHC or heat storage tank system, it is necessary to keep the primary-side temperature difference of the heat exchanger constant. That is, in the DHC, there is an item that the customer returns the cold / hot water supplied from the heat supplier with a temperature difference of a certain value or more during the contract between the customer and the heat supplier. In addition, since the heat storage tank has a temperature stratification from a low-temperature part to a high-temperature part, the temperature stratification is broken when the cold / hot water returns to the heat storage tank without a difference in temperature.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a C-type heat source unit.
OP can be improved to save energy, and DH
It is an object of the present invention to provide a water supply temperature control device capable of maintaining a primary temperature difference of a heat exchanger in a heat storage tank system or a heat exchanger at a predetermined value or more.

[0006]

In order to achieve such an object, a first invention (an invention according to claim 1) provides an air conditioner having an opening degree of a control valve and control of the air conditioner. Determine the control status of each air conditioner based on the environmental status
The total water supply state is determined based on the control state of each air conditioner, and the set value change width for the current set water supply temperature is determined based on the total water supply state.
A second invention (an invention according to claim 2) includes an opening state of a control valve attached to an air conditioner, a deviation between an actual temperature controlled by the air conditioner and a set temperature, a convergence state of the deviation, and The control state of each air conditioner is determined based on the indoor humidity receiving supply of air supply from the air conditioner, the overall water supply state is determined based on the control state of each air conditioner, and the total water supply state is determined based on the total water supply state. The set value change width for the current set water supply temperature is determined.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. FIG. 2 is an instrumentation diagram showing one embodiment of an air conditioning control system using the water supply temperature control device according to the present invention.

In FIG. 1, 1-1 to 1-n are air conditioners of a double coil system (a combination of a cold water coil and a hot water coil), and 2-1 to 2-n are air conditioners 1-1 to 1-n. 3-1 to 3-n are chilled water valves (two-way valves) attached to the air conditioner 1-1.
Hot water valves (two-way valves) attached to 4-1 to n
n is an air conditioner controller, and 5-1 to 5-n are air conditioners 1-
An air supply temperature sensor for detecting an air supply temperature from 1 to 1-n;
Reference numerals 6-1 to 6-n denote humidity sensors for detecting indoor humidity supplied with air supply from the air conditioners 1-1 to 1-n;
7-2 is a flow meter, 8-1 and 8-2 are heat source controllers,
9-1 and 9-2 are cold heat source machines, 10-1 and 10-2 are warm heat machine, 11-1 to 11-4 are pumps, 12-1 and 12-
2 is a temperature sensor for detecting the temperature of the cold water from the cold heat source devices 9-1 and 9-2, and 12-3 and 12-4 are hot heat source devices 10-1 and 10-2.
Temperature sensor for detecting the temperature of hot water from 10-2, 13-
1 is a cold water outgoing line, 13-2 is a cold water return line, 14
-1 is a hot water outgoing line, 14-2 is a hot water return line, 1
5-1 to 15-4 are headers.

In this air conditioning control system, the air conditioner 1
-1 to 1-n receive the supply of cold water through the cold water outflow pipe line 13-1, generate cold air, and manage the hot water outflow management 14-.
The hot air is supplied through the hot air supply 1 to generate hot air, and the cold air is supplied to each room. Air supply temperature sensors 5-1 to 5-n are provided in an air supply passage from the air conditioners 1-1 to 1-n to each room. Actual measurement value t _pv of supply air temperature from air temperature sensors 5-1 to 5-n
Opening information X _C1 according to the deviation between the air temperature and the set value _tsp of the supply air temperature.
To X _Cn, X _H1 generates to X _Hn, supply air temperature measured value t _pv and supply air temperature set value t cold water valve as _sp and matches 2-1
To 2-n, the opening degree of the hot water valves 3-1 to 3-n is controlled. FIG. 3 shows a partially enlarged view around the air conditioner.

[0010] In the present embodiment, although the open control of the only gives opening information X _C and X _H cold water valve 2 and the hot water valve 3, the valve opening degree encoder in cold water valve 2 and the hot water valve 3 The opening of the cold water valve 2 and the opening of the hot water valve 3 may be feedback-controlled based on the actual opening from the valve opening encoder.

The air conditioner controllers 4-1 to 4-n include opening information X _{C1 to} X _Cn for the cold water valves 2-1 to 2-n and opening information X _H1 to X _H1 for the hot water valves 3-1 to 3-n. X _Hn, the deviation between the set value t _sp of actually measured value t _pv and supply air temperature of the supply air temperature from the supply air temperature sensor 5-1 to 5-n (supply air temperature deviation), convergence of the supply air temperature deviation Situation and humidity sensor 6-1 to 6
-N based on the measured indoor humidity H _pv from -n
Determine the control state (air conditioner status) of 1-1 to 1-n,
This air conditioner status is sent to the heat source controllers 8-1 and 8-2. 4 and 5 show the air conditioner controller 4.
It is a flowchart which shows the determination situation of the air conditioner status in (4-1 to 4-n).

The air conditioner controller 4 calculates the supply air temperature deviation every predetermined time (for example, 10 seconds) according to the flow chart shown in FIG. 4, and calculates the supplied air supply temperature deviation for a set time (for example, 5 minutes). Average calculation is performed every time (Step 40
1). Then, the actual measured value H of the indoor humidity from the humidity sensor 6
_pv is checked (step 402), and if the indoor humidity is equal to or higher than a predetermined indoor humidity upper limit (indoor humidity ≧ indoor humidity upper limit), the air conditioner status is set to “cold water temperature DO”.
WN ”(step 410), the heat source controller 8
Send to -1.

In step 402, if the room humidity <the indoor humidity upper limit value, it is checked whether or not the opening of the chilled water valve 2 has maintained the 100% opening during the set time (5 minutes) (step 402). 403) If the opening degree is not maintained at 100%, the opening degree of the hot water valve 3 is checked (step 404). If the hot water valve 3 is in the fully closed state, the air conditioner status is set to "cold water temperature UP". (Step 4
05), if the hot water valve 3 is not in the fully closed state, the air conditioner status is set to "cold water temperature maintained" (step 406) and sent to the heat source controller 8-1.

If it is determined in step 403 that the opening degree is maintained at 100%, it is confirmed that the hot water valve 3 is in the fully closed state (step 407). The air conditioner is compared with an allowable value (for example, 2 ° C.) (step 408). (Step 406), send to the heat source controller 8-1. If the hot water valve 3 is not in the fully closed state in step 407, it is sent to the heat source controller 8-1 as "cold water temperature DOWN".

At step 408, if the average air supply temperature deviation exceeds the allowable value (average air supply temperature deviation ≧ allowable value), the current average air supply temperature deviation and the previous average air supply temperature (5 minutes before) If the average air supply temperature deviation this time is larger than the previous average air supply temperature deviation, it is determined that the air supply temperature deviation is not converging, and the air conditioner status is set to ""Cool water temperature DOWN" (step 410) and send it to the heat source controller 8-1.

On the other hand, in step 409, if the present average supply air temperature deviation is smaller than the previous average supply air temperature deviation, it is determined that the supply air temperature deviation is converging and the air conditioner status is changed. As “maintaining cold water temperature” (step 406), it is sent to the heat source controller 8-1.

The air conditioner controller 4 operates for a predetermined time (for example, 10 seconds) according to the flowchart shown in FIG.
The supply air temperature deviation is calculated every elapse, and the obtained supply air temperature deviation is averaged for each set time (for example, 5 minutes) (step 501). Then, it is checked whether or not the opening of the hot water valve 3 has maintained the 100% opening during the set time (5 minutes) (step 502). Then, the air conditioner status is set to “hot water temperature DOWN” (step 503) and sent to the heat source controller 8-2.

If it is determined in step 502 that the opening degree is maintained at 100%, the average supply air temperature deviation obtained in step 501 is compared with an allowable value (for example, 2 ° C.) (step 504), and If the air temperature deviation is within the allowable value (average supply air temperature deviation <allowable value), the air conditioner status is set to "maintain hot water temperature" (step 505) and sent to the heat source controller 8-2.

At step 504, if the average air supply temperature deviation exceeds the allowable value (average air supply temperature deviation ≧ allowable value), the current average air supply temperature deviation and the previous average air supply temperature (5 minutes before) If the current average supply air temperature deviation is larger than the previous average supply air temperature deviation, it is determined that the supply air temperature deviation is not converging, and the air conditioner status is set to " (Warm water temperature UP) (step 50
7) Send to the heat source controller 8-2.

On the other hand, in step 506, if the present average supply air temperature deviation is smaller than the previous average supply air temperature deviation, it is determined that the supply air temperature deviation is converging and the air conditioner status is changed. As “maintaining hot water temperature” (step 505), it is sent to the heat source controller 8-2.

FIG. 6 shows the relationship among the air conditioner status, the opening state of the cold water valve, the opening state of the hot water valve, the supply air temperature deviation, the convergence of the air supply temperature deviation, and the room humidity. In FIG. 6, “示 し” indicates that the condition is irrelevant.

On the other hand, the heat source controllers 8-1 and 8-2
Determines the overall water supply state (water supply temperature control signal) based on the air conditioner status sent from the air conditioner controllers 4-1 to 4-n. FIG. 7 shows the heat source controller 8-1.
And FIG. 8 is a flowchart showing how the heat source controller 8-2 determines the hot water temperature control signal.

The heat source controller 8-1 follows the flowchart shown in FIG.
It is checked whether or not there is at least one "cool water temperature DOWN" in the air conditioner status from -n (step 70).
1). If there is at least one "chilled water temperature DOWN", the chilled water temperature control signal is determined to be "chilled water temperature DOWN" (step 702). If there is no “chilled water temperature DOWN”, the number of “chilled water temperature UP” is checked (step 703), and the number of “chilled water temperature UP” is set to the set number (1 in this embodiment).
), The chilled water temperature control signal
P ”(step 704). "Cold water temperature UP"
If the number is less than or equal to the set number, the chilled water temperature control signal is determined to be "keep chilled water temperature" (step 705).

The heat source controller 8-2 follows the flowchart shown in FIG.
It is checked whether there is at least one "hot water temperature UP" in the air conditioner status from -n (step 801).
If there is at least one "hot water temperature UP", the hot water temperature control signal is determined to be "hot water temperature UP" (step 802). If there is no "hot water temperature UP", the number of "hot water temperature DOWN" is checked (step 803), and "hot water temperature DOWN" is checked.
If the number of "N" is equal to or greater than the set number (one in this embodiment), the hot water temperature control signal is determined to be "hot water temperature DOWN" (step 804). If the number of “hot water temperature DOWN” is equal to or less than the set number, the hot water temperature control signal is determined to be “maintain hot water temperature” (step 805).

FIG. 9 shows the relationship between the air conditioner status from each air conditioner controller and the water supply temperature control signal. In addition,
In FIG. 9, “present” indicates that there is at least one air conditioner status, “〜” indicates that the air conditioner control status is irrelevant, and “absent” indicates that the air conditioner control status is not. It is not shown.

Next, the heat source controllers 8-1 and 8-
2 determines the set value change width for the current set water supply temperature to the cold / hot heat source units 9-1 and 9-2 and 10-1 and 10-2 based on the water supply temperature control signal determined above. FIG.
0 is a flowchart showing the determination of the set value change width in the heat source controller 8-1. FIG. 11 is a flowchart showing the determination of the set value change width in the heat source controller 8-2.

The heat source controller 8-1 checks the previously determined chilled water temperature control signal according to the flowchart shown in FIG. 10 (step 101). If the chilled water temperature control signal is "maintain chilled water temperature", the current set value change width is set to zero, that is, the previous set chilled water temperature (chilled water set temperature) T _Csp is set as the _currently set chilled water temperature T _Csp (step 102). Is sent to the cold and heat source devices 9-1 and 9-2 (step 107).

On the other hand, if the chilled water temperature control signal is "chilled water temperature UP", the currently set water supply temperature T _Csp is checked (step 103). Here, if the current set water supply temperature T _Csp is equal to or lower than the set upper limit value (T _Csp <set upper limit value), the current set value change width (increase width) is determined as ΔT _CU , and the set value change width ΔT _CU is added to the previous (current) set water supply temperature T _Csp and the current set water supply temperature T _Csp is added.
_Csp is obtained (step 104), and the cold / hot source units 9-1 and 9-
2 (step 107).

The chilled water temperature control signal is "Cold water temperature DO".
WN ", the current set water supply temperature T_Cspcheck
(Step 105). Where the current set water temperature
T_{Cs p}Is greater than or equal to the set lower limit (T_Csp> Setting lower limit
Value), the current set value change width (decrease width) is ΔT_CDDecided as
After setting, this set value change width ΔT_CDTo the previous (current)
Set water supply temperature T_CspSubtract this setting water supply temperature
T_Csp(Step 106), and the cold-heat source devices 9-1, 9
-2 (step 107).

If "T _Csp ≥ set upper limit" is satisfied in step 103, and if "T _Csp
If it was _Csp ≦ set lower limit ", the set water temperature T _{Cs p} last as the current set flow temperature T _Csp (Step 1
02), and send them to the cold and heat source devices 9-1 and 9-2 (step 10).
7). The cold heat source units 9-1 and 9-2 are connected to the heat source controller 8
In response to setting the water supply temperature T _{Cs p} from -1, set water temperature T _Csp and as the measured value T _Cpv the supply water temperature is matched to detect the temperature sensor 12-1 and 12-2, its operating capacity To adjust.

Note that, in the present embodiment, the increase width ΔT
_{Although the CU} and the decrease width ΔT _CD are constant values, they may be changed according to the current set water supply temperature _TCsp . The heat source controller 8-1 also controls the cooling and heating source devices 9-1 and 9-2 and the pump 11 based on the information from the air conditioner controllers 4-1 to 4-n and the flow measurement value from the flow meter 7-1. Send a start / stop control signal to -1 and 11-2. As a result, the cold-heat source devices 9-1 and 9-2 and the pumps 11-1 and 11-1,
While the start / stop of 11-2 is controlled, the cold-source units 9-1 and 9 are controlled.
The water supply temperature from −2 is maintained at the set water supply temperature T _Csp .

The heat source controller 8-2 checks the previously determined hot water temperature control signal in accordance with the flowchart shown in FIG. 11 (step 111). If the hot water temperature control signal is "maintain hot water temperature", the current set value change width is set to zero, that is, the previous set water supply temperature (hot water set temperature) _THsp is set to the current set water supply temperature _THsp (step 112). Are sent to the heat source devices 10-1 and 10-2 (step 117).

On the other hand, if the hot water temperature control signal is "hot water temperature UP", the current set water supply temperature _THsp is checked (step 113). Here, if the current set water supply temperature T _Hsp is equal to or lower than the set upper limit value (T _Hsp <set upper limit value), the current set value change width (increase width) is determined as ΔT _HU , and the set value change width ΔT _HU is determined. _HU is added to the previous (current) set water supply temperature T _Hsp and the current set water supply temperature T _Hsp is added.
_Hsp is determined (step 114), and the heat source units 10-1, 1
Send to 0-2 (step 117).

Also, the hot water temperature control signal is "Hot water temperature DO".
If it is "WN", the current set water supply temperature _THsp is checked (step 115). Here, if the current setting water temperature T _{Hs p} is set more than the lower limit value (T _Hsp> set lower limit value), upon which this set value changing width (decrease width) was determined as [Delta] T _HD, change the setting value width [Delta] T _HD last (current) set supply water temperature T _Hsp than minus seeking new marking supply water temperature T _Hsp in (step 116), temperature heat source unit 10-1,
Send to 10-2 (step 117).

If "T _Hsp .gtoreq.set upper limit" is satisfied in step 113, and if "T _Hsp
If it was _hsp ≦ set lower limit ", the set water temperature T _{Hs p} last as the current set flow temperature T _Hsp (Step 1
12), and sent to the heat source devices 10-1 and 10-2 (step 117). Temperature heat source apparatus 10-1 and 10-2 receives the set water temperature T _Hsp from the heat source controller 8-2, found in the water temperature detected by the set water temperature T _Hsp and the temperature sensor 12-3 and 12-4 _{So that the} value T _Hpv matches
Adjust your driving ability.

Note that, in the present embodiment, the raising width ΔT
_{Although the HU} and the decrease width ΔT _HD are constant values, they may be changed according to the current set water supply temperature _THsp . The heat source controller 8-2 also controls the heat source devices 10-1 and 10-2 based on information from the air conditioner controllers 4-1 to 4-n and a flow rate measurement value from the flow meter 7-2.
And a start / stop control signal to the pumps 11-3 and 11-4. Thus, while the start and stop of the heat source devices 10-1 and 10-2 and the pumps 11-3 and 11-4 are controlled, the water supply temperature from the heat source devices 10-1 and 10-2 is set to the set water supply temperature T.
_Hsp will be maintained.

For reference, FIG. 1 is a block diagram showing a main part of the air conditioning control system. In this air-conditioning control system, the air-conditioning controllers 4-1 to 4-n determine the opening degree of the chilled water valve, the opening degree of the hot water valve, the supply air temperature deviation, the convergence state of the air supply temperature deviation, and the indoor humidity. To determine the air conditioner status, and send the air conditioner status to the heat source controllers 8-1 and 8-2.

The heat source controller 8-1 sends a chilled water temperature control signal to the "chilled water temperature DOW" based on the air conditioner status sent from the air conditioner controllers 4-1 to 4-n.
N "," maintain cold water temperature ", and" cool water temperature UP "and determine them (block 8-1A). Then, based on the determined chilled water temperature control signal, a set value change width ΔT _C (increase width _{ΔC) with} respect to the current set water supply temperature T _Csp .
T _CU and reduction width ΔT _CD ) are determined. Then, based on the determined set value change width ΔT _C , the current set water supply temperature T _Csp is calculated, and the calculated set water supply temperature T _Csp is sent to the cooling and heating units 9-1 and 9-2 (block 8). -1B).

The heat source controller 8-2 sends a hot water temperature control signal to the "hot water temperature DOW" based on the air conditioner status sent from the air conditioner controllers 4-1 to 4-n.
N "," Hot water temperature maintenance ", and" Hot water temperature UP "are determined (block 8-2A). Then, based on the hot water temperature control signal this determined set value changes to the current set supply water temperature T _Hsp width [Delta] T _H (increase rate Δ
T _HU and reduction width ΔT _HD ). Then, based on the set value change width [Delta] T _H that this decision, calculating the current set flow temperature T _Hsp (block 8-2B), heat source machine the calculated set flow temperature T _Hsp 10-1,10- Send to 2.

As described above, according to the present embodiment, not only the opening degree of the cold water valve 2 and the hot water valve 3 attached to the air conditioner 1, but also the supply air temperature from the air conditioner 1 and the set supply The deviation from the air temperature (air supply temperature deviation), the convergence state of the air supply temperature deviation, and the humidity in the room receiving the supply of air from the air conditioner 1 are taken as the indoor environment and the control state of the air conditioner 1 (air conditioner) Status), the overall water supply state (water supply temperature control signal) is determined based on the air conditioner status, and the set value change width for the current set water supply temperature is determined based on the total water supply state. As the optimum water supply temperature according to the load, it is possible to prevent the water supply temperature from becoming excessive at a low load, and to reduce the COP of the cold heat source devices 9-1 and 9-2 and the hot heat source devices 10-1 and 10-2. Can improve and save energy. To become.

Further, according to the present embodiment, since the air supply temperature is used to determine the air conditioner status, that is, air conditioning is performed at the air supply temperature at which the effect of adjusting the opening of the control valve 1 occurs relatively quickly. Since the environmental condition controlled by the machine 1 is observed, the indoor environment is early reflected in the control of the water supply temperature. The environmental state controlled by the air conditioner 1 does not necessarily need to be viewed at the supply air temperature, but may be viewed at the room temperature or the return air temperature.

In the present embodiment, the air conditioner status is determined by the air conditioner controller 4.
That is, the processing operation based on the flowcharts shown in FIGS. 4 and 5 is performed by the air conditioner controller 4, but this processing may be performed by the heat source controllers 8-1 and 8-2. In this case, information such as the opening degree of the cold water valve and the opening degree of the hot water valve is sent from the air conditioner controllers 4-1 to 4-n to the heat source controllers 8-1 and 8-2.

In the present embodiment, the air conditioning control system of the double coil system has been described. However, the air conditioning control system of the single coil system can be similarly applied. In this case, there is one control valve for each air conditioner, and the air conditioner status output from the air conditioner controller is one type regardless of cold water / hot water (“water supply temperature UP”, “water supply temperature maintenance”, “water supply temperature maintenance”). Temperature DOWN "). Also, the total water supply state in the heat source controller is one type (“water supply temperature UP”, “water supply temperature maintenance”, “water supply temperature DOWN”) without distinction between cold water and hot water, and the set water supply temperature to be adjusted is also one type. .

Further, in the present embodiment, an example has been described in which the heat source unit is provided in a building. However, as shown in FIG. 12, a case where cold and hot water is supplied from a DHC or a heat storage tank system is used. The same can be applied to the above.

In FIG. 12, 21-1 to 21-n are single type air conditioners, and 22-1 to 22-n are air conditioners 21.
Control valves (two-way valves) attached to -1 to 21-n, 23-
1 to 23-n are air conditioner controllers, 24-1 to 24-
n is an air supply temperature sensor for detecting an air supply temperature from the air conditioners 21-1 to 21-n, and 25-1 to 25-n are air conditioners 21-n.
A humidity sensor for detecting humidity in a room receiving supply of air supply from 1-21 to 21-n, 26 is a flow meter, 27 is a heat source controller, 28 is a heat exchanger, 29 is a primary pump, and 30-1 to 30-1.
30-3 is a secondary pump (booster pump), 31-1,
31-2 is an inverter, 32 is a temperature sensor for detecting the secondary side water supply temperature of the heat exchanger 28, and 33 is one of the heat exchangers 28.
A control valve provided in the secondary water line, 34 is a temperature controller, and 35-1 to 35-3 are headers.

In this air-conditioning control system, the air-conditioning controllers 23-1 to 23-n control the opening degree of the control valve,
The air conditioner status is determined based on the supply air temperature deviation, the convergence state of the supply air temperature deviation, and the indoor humidity, and the air conditioner status is sent to the heat source controller 27. The heat source controller 27 includes air conditioner controllers 23-1 to 23-n.
Based on the air conditioner status sent from the company, the water supply temperature control signal is classified and determined into each state of “water supply temperature DOWN”, “water supply temperature maintenance”, and “water supply temperature UP”.
Then, based on the cold water temperature control signal this determined, to determine a set value change width [Delta] T (increase range [Delta] T _U, decrease width [Delta] T _D) to the current set flow temperature T _sp. Then, based on the determined set value change width ΔT, the current set water supply temperature T _sp is calculated, and the calculated set water supply temperature T _sp is sent to the temperature controller 34.

The temperature controller 34 calculates the _currently set water supply temperature T _sp and the actually measured water supply temperature T _pv from the temperature sensor 32.
The opening degree of the control valve 33 is adjusted so that is equal to. As a result, an optimum water supply temperature according to the load is obtained, and it is prevented that the secondary side water supply temperature of the heat exchanger 28 becomes excessive when the load is low, and the secondary side return water temperature of the heat exchanger 28 is kept above a certain value (cooling). Time) or below a certain value (at the time of heating), it is possible to keep the primary-side temperature difference of the heat exchanger 28 above a certain value.

[0048]

As apparent from the above description, according to the present invention, in the first invention, each air conditioner is controlled based on the opening degree of a control valve attached to the air conditioner and the environmental state controlled by the air conditioner. The control state of the air conditioner is determined, the total water supply state is determined based on the control state of each air conditioner, and the set value change width for the current set water supply temperature is determined based on the total water supply state. Not only the opening degree of the control valve attached to the air conditioner, but also the environmental state controlled by the air conditioner is reflected in the determination of the control state of each air conditioner. It is possible to prevent the water supply temperature from becoming too high, to improve the COP of the heat source unit, and to save energy. In addition, in the DHC or heat storage tank system, it is possible to prevent the secondary-side water supply temperature of the heat exchanger from being excessive when the load is low, and to keep the secondary-side return water temperature of the heat exchanger at a certain value or more (during cooling) or below a certain value. As (at the time of heating), it is possible to keep the primary-side temperature difference of the heat exchanger at or above a certain value.

According to the second aspect of the invention, the opening degree of the control valve attached to the air conditioner, the deviation between the actual temperature controlled by the air conditioner and the set temperature, the convergence of the deviation, and the supply from the air conditioner The control state of each air conditioner is determined based on the humidity in the room to which air is supplied, the total water supply state is determined based on the control state of each air conditioner, and the current set water supply temperature is determined based on the total water supply state. Is determined, and an effect similar to that of the first invention is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main part of the air conditioning control system shown in FIG.

FIG. 2 is an instrumentation diagram showing one embodiment of an air conditioning control system using the water supply temperature control device according to the present invention.

FIG. 3 is a partially enlarged view around an air conditioner in the air conditioning control system.

FIG. 4 is a flowchart showing a state of determining an air conditioner status (cool water temperature) in an air conditioner controller in the air conditioning control system.

FIG. 5 is a flowchart showing a state of determining an air conditioner status (hot water temperature) in an air conditioner controller in the air conditioning control system.

FIG. 6 is a diagram showing a relationship among an air conditioner status, an opening state of a cold water valve, an opening state of a hot water valve, a supply air temperature deviation, a convergence state of the air supply temperature deviation, and indoor humidity.

FIG. 7 is a flowchart showing a determination state of a chilled water temperature control signal in a heat source controller in the air conditioning control system.

FIG. 8 is a flowchart showing a determination state of a hot water temperature control signal in a heat source controller in the air conditioning control system.

FIG. 9 is a diagram showing a relationship between an air conditioner status and a water supply temperature control signal from each air conditioner controller.

FIG. 10 is a flowchart showing a situation in which a heat source controller determines a set value change width for a cold water set temperature.

FIG. 11 is a flowchart illustrating a determination state of a set value change width with respect to a hot water set temperature in a heat source controller.

FIG. 12 is a diagram illustrating an example of application to an air conditioning control system that receives supply of cold and hot water from a DHC or a heat storage tank system.

[Explanation of symbols]

1-1 to 1-n: air conditioner, 2-1 to 2-n: cold water valve, 3
-1 to 3-n: hot water valve, 4-1 to 4-n: air conditioner controller, 5-1 to 5-n: air supply temperature sensor, 6-1 to 6
-N: humidity sensor, 7-1, 7-2: flow meter, 8-1,
8-2: Heat source controller, 9-1, 9-2: Cold heat source machine, 10-1, 10-2: Hot heat machine, 11-1 to 11-
4. Pump, 12-1 to 12-4 ... Temperature sensor, 13-
1: Cold water outgoing line, 13-2: Cold water return line, 14
-1: Hot water incoming pipeline, 14-2: Hot water return pipeline, 1
5-1 to 15-4 ... header.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kanako Ito 2-12-19 Shibuya, Shibuya-ku, Tokyo Inside Yamatake Ha Newel Co., Ltd. (72) Inventor Hideya Saito 2-12-19 Shibuya Shibuya-ku, Tokyo Yamatake Honeywell Co., Ltd.

Claims (2)

[Claims] A control state of each air conditioner, which is determined based on an opening degree of a control valve attached to the air conditioner and an environmental state controlled by the air conditioner, is input. A total water supply state determining means for determining the total water supply state based on the control state; and a set value change for determining a set value change width for the current set water supply temperature based on the total water supply state determined by the total water supply state determination means. A water supply temperature control device comprising a width determining means. 2. An opening state of a control valve attached to the air conditioner,
Deviation between the actual temperature controlled by the air conditioner and the set temperature,
The control state of each air conditioner, which is determined based on the convergence state of this deviation and the humidity in the room receiving the supply of air from the air conditioner, is input, and based on the input control state of each air conditioner. A total water supply state determining means for determining the total water supply state; and a set value change width determination means for determining a set value change width for the current set water supply temperature based on the total water supply state determined by the total water supply state determination means. A water supply temperature control device, comprising: