JP2014066389A - System and method for controlling rotational frequency of cold/hot water circulation pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system of wide application by improving stability and followability of rotational frequency control of a cold/hot water circulation pump.SOLUTION: An air conditioning system includes air conditioners 1-1 to 1-5, a cold/hot water circulation pump 2 and control valves 3-1 to 3-5. The control valve 3-1 to 3-5 is a control valve with a flow rate measurement function or a control valve without the flow rate measurement function. A controller 5 calculates a total value of flow rates of the control valves 3 without the flow rate measurement function from a total flow rate measurement value measured by a total flowmeter 15 and a total value of flow rate measurement values measured by the control valves 3 with the flow rate measurement function, and calculates a pump head prediction value of the cold/hot water circulation pump 2 from the total value of the flow rate measurement values, a total value of increase amount of flow rates of the control valves 3 with the flow rate measurement function, the total value of flow rates of the control valves 3 without the flow rate measurement function, the total flow rate measurement value and a pump head measurement value of the cold/hot water circulation pump 2, so as to control rotational frequency of the cold/hot water circulation pump 2.

Description

  The present invention relates to a system and method for controlling the number of rotations of a cold / hot water circulation pump for circulating cold / hot water supplied to an air conditioner in an air conditioning system.

  Conventionally, in a cold / hot water system of an air conditioning system, in order to save energy, minimum resistance control has been performed to minimize the electric consumption of a cold / hot water circulation pump that circulates cold water or hot water (hereinafter referred to as cold / hot water) supplied to an air conditioner. (For example, see Patent Document 1). In this minimum resistance control, the cold / hot water circulation pump is designed so that the opening degree of the control valve provided in the cold / hot water supply passage to the air conditioner is maximized, that is, the pressure loss consumed in the control valve is minimized. Control the number of revolutions.

  FIG. 7 is a block diagram showing the configuration of a conventional cold / hot water circulation pump rotation speed control system. The cold / hot water to which pressure is applied by the cold / hot water circulation pump 100 is supplied to an air conditioner (AHU (Air Handling Unit) or FCU (Fan Coil Unit)) (not shown) via the control valve 101 and the outgoing water pipe 102.

  The cold / hot water is heat-exchanged in the air conditioner, returned to the cold / hot water circulation pump 100 via a return water pipe (not shown), and pumped by the cold / hot water circulation pump 100 again. Cold and hot water circulates through the above-described path. Cold air or hot air generated in the air conditioner is supplied to the controlled area as supply air, and a measured value of the supply air temperature is given to the valve opening degree control device 103.

The valve opening degree control device 103 controls the opening degree of the control valve 101 so that the supply air temperature measurement value matches the supply air temperature setting value. Subtraction unit 104 calculates the deviation Δφ between the control valve opening phi and the control valve opening setting value phi _SP. Control calculation unit 105, as the control valve opening phi control valve opening setting value phi _SP coincide, calculates a set value H _SP of lift of hot and cold water circulation pump 100. The pressure sensor 106 calculates the head H of the cold / hot water circulation pump 100 by subtracting the pressure of the cold / warm water before passing through the cold / hot water circulation pump 100 from the pressure of the cold / hot water after passing through the cold / hot water circulation pump 100.

Lift deviation calculating section 107 calculates the difference ΔH between the lift H and the lift set value H _SP of hot and cold water circulation pump 100. Control calculation unit 108, as the lift H and the lift set value H _SP match (i.e., lift deviation ΔH is such that 0) calculates the rotational speed n of the hot and cold water circulation pump 100. The rotation speed control device 109 controls the rotation speed of the cold / hot water circulation pump 100 to be n.

In the example of FIG. 7, only one control valve 101 is described, but actually, a plurality of control valves 101 are provided corresponding to a plurality of air conditioners, and the cold and hot water that has passed through each control valve 101 is respectively It is supplied to the corresponding air conditioner. Then, controlled the for controlling the rotational speed n of the hot and cold water circulation pump 100 so that at least one opening of the control valve 101 is fully opened, lift setting value H _SP pump 100.

As an improved version of the above system, the inventor has proposed a configuration in which a flow rate measurement function is added to the control valve, and the rotational speed n of the cold / hot water circulation pump is controlled by the control valve opening φ and the flow rate Q _sp (see Patent Document 2). ). FIG. 8 is a block diagram showing the configuration of the rotational speed control system of the cold / hot water circulation pump disclosed in Patent Document 2. As shown in FIG. In FIG. 8, only one control valve 3 and one controller 4 are shown, but the control valve 3 and the controller 4 are provided for each air conditioner.

The head prediction value calculation unit 207 calculates the head prediction value P ₀ of the cold / hot water circulation pump 2 from the flow rate set value Q _SP of the control valve 3, the flow rate measurement value Q, and the head measurement value H of the cold / hot water circulation pump 2. The head correction value calculation unit 208 is a chilled / hot water circulation pump based on at least one of the flow rate setting value _QSP , the flow rate measurement value Q, the opening degree φ of the control valve 3 and the heat output state of an air conditioner (not shown). 2 is calculated. Lift setting value calculation unit 209 adds up the the lift correction value ΔP lift predicted value P ₀ of the hot and cold water circulation pump 2, and calculates the lift setting value H _SP of cold and hot water circulation pump 2. Lift deviation calculating section 210 calculates the difference ΔH between the lift measurement value H and lift setting value H _SP of hot and cold water circulation pump 2. Rotational speed control calculation unit 211, as the lift measurement value H and lift setting value H _SP match (i.e., lift deviation ΔH is such that 0) calculates the rotational speed n of the cold and hot water circulation pump 2. The rotation speed control device 8 controls the rotation speed of the cold / hot water circulation pump 2 to be n.

[Required flow rate and control valve opening]
The controller 4 is transmitted based on the supply air temperature t of the temperature sensor (not shown) is measured to calculate the change amount of the hot and cold water flow through the control valve 3, the required flow rate signal indicating the flow rate set value Q _SP to the control valve 3 To do. Specifically, the controller 4 calculates a deviation Δt = t−t _SP between the supply air temperature measurement value t and a predetermined supply air temperature setting value t _SP, and calculates the supply air temperature measurement value t and the supply air temperature setting value. The flow rate setting value Q _SP is calculated so that t _SP matches (that is, the supply air temperature deviation Δt becomes 0).

The control valve 3 with the flow rate measurement control function receives the required flow rate signal from the controller 4, compares the flow rate Q measured by itself with the flow rate set value Q _SP , and compares the flow rate measured value Q with the flow rate set value Q _SP . The deviation ΔQ is calculated. Subsequently, the control valve 3 controls its opening degree on the basis of a certain control calculation logic (for example, proportional integral control calculation, commonly known as PI control calculation). Specifically, the control valve 3 calculates a deviation ΔQ = Q _SP −Q between the flow rate measurement value Q and the flow rate setting value Q _SP indicated by the request flow rate signal transmitted from the controller 4, and the flow rate measurement value Q and the flow rate are calculated. The control valve opening φ is controlled so that the set value Q _SP matches (that is, the flow rate deviation ΔQ becomes zero). Thus, according to the control operation of the control valve 3, the amount of cold / hot water passing through the air conditioner is adjusted, and the load of the air conditioner is controlled.

[Feed forward control]
On the other hand, the head prediction value calculation unit 207 sums the flow rate setting values Q _SP of the control valves 3 indicated by the request flow rate signals transmitted from the controller 4 and sums the flow rate measurement values Q measured by the control valves 3. Then, for the feedforward control of the pump rotation speed, the head prediction value P ₀ of the cold / hot water circulation pump 2 is calculated. The head prediction value P ₀ of the chilled / hot water circulation pump 2 can be calculated by the equation (1) based on the rotational speed characteristics of the chilled / hot water circulation pump 2. In Formula (1), H is a head measurement value of the cold / hot water circulation pump 2.

[Feedback control (pump head raising)]
If there is an air conditioner that lacks the heat output state S, the controller 4 that controls the air conditioner controls the air conditioner so that the heat output state S of the air conditioner does not become insufficient, and sets a new cold / hot water flow rate setting value Q _SP . Will be output. The state in which the heat output state S of the air conditioner is insufficient is a state in which the supply air temperature deviation Δt is lower than an allowable value (for example, Δt ≦ −1 ° C.) in the heating mode, for example, and the air supply is in the cooling mode. The air temperature deviation Δt is higher than the allowable value (for example, Δt ≧ + 1 ° C.).

The difference between the new chilled / hot water flow rate setting value _QSP and the chilled / warm water flow rate measured value Q is an increase ΔQ of the chilled / hot water flow rate.
ΔQ = Q _SP −Q (2)

The static pressure difference P before and after the control valve, which is the flow pressure loss of the control valve 3, can be calculated by the equation (3).
P = K ₀ · Q ² (3)
In equation (3), K ₀ is the resistance coefficient when the control valve is fully open.

The change value ΔPi of the static pressure difference before and after the control valve due to the change of the cold / hot water flow rate can be calculated by the equation (3).
ΔPi = K ₀ · (ΔQ ² + ΔQ · Q) (4)

The resistance coefficient K ₀ when the control valve is fully open can be calculated as follows based on the capacity coefficient Cv of the control valve.

  In the formula (5), γ is the specific gravity of cold / hot water, and generally γ = 1 in water. The capacity coefficient Cv of the control valve is generally specified in the catalog of the control valve manufacturer. When Expression (5) is used, the unit of the change value ΔPi of the static pressure difference before and after the control valve is kPa, and the unit of the flow rate measurement value Q is L / min. The heat output state value S of the air conditioner can be calculated as follows.

a and b are weighting factors, for example, a = 0.99, b = 0.01. φ is the control valve opening corresponding to the air conditioner, φ _max is the maximum value of each control valve opening, Δt is the supply air temperature deviation corresponding to the air conditioner, and Δt _max is the maximum allowable air supply temperature deviation Δt. Value.
The head correction value calculation unit 208 calculates the change value ΔPi of the static pressure difference before and after the control valve for the air conditioner in which the heat output state S is insufficient, and sets the maximum value among these values ΔPi to the cold / hot water circulation pump 2. The lift correction value ΔP of That is, the lift correction value ΔP is expressed by the following equation.
ΔP = max (ΔP ₁ , ΔP ₂ ,..., ΔP _k ) (7)
Here, k is the number of air conditioners for which the heat output state S is insufficient.

[Feedback control (pump head lowering)]
If the heat output state S is insufficient or there is no suitable air conditioner, and there is an air conditioner with an excessive heat output state S, it indicates that the cold / hot water circulation pump 2 has an extra head. It is necessary to lower the head of the cold / hot water circulation pump 2. The state in which the heat output state S of the air conditioner is excessive is, for example, a state where the supply air temperature deviation Δt is higher than an allowable value (for example, Δt ≧ + 1 ° C.) in the heating mode, and a supply air temperature deviation in the cooling mode. This is a state where Δt is lower than an allowable value (for example, Δt ≦ −1 ° C.).

The head correction value ΔP of the cold / hot water circulation pump 2 can be calculated from the opening degree of the control valve 3 and the flow rate measurement value Q (or the flow rate setting value Q _SP ).
ΔP = K · Q ² (8)
From this flow pressure calculation formula, the change value ΔPi of the static pressure difference before and after the control valve until the control valve is fully opened can be calculated as the following formula.
ΔPi = (K−K ₀ ) · Q ² (9)

In equation (9), K is the resistance coefficient of the control valve, and can be calculated as follows for a control valve with equal percentage characteristics.
K = K ₀ / R ^{2 (φ-1)} (10)

The resistance coefficient K ₀ when the control valve is fully open can be calculated as in Expression (5) based on the capacity coefficient Cv of the control valve. R is the inherent range ability of the control valve, which is the ratio of the maximum flow rate to the minimum flow rate that can be controlled, and is generally specified in the catalog of the control valve manufacturer. The control valve opening φ has a value of 0 to 1 (or 0% to 100%).

The head correction value calculation unit 208 calculates the change value ΔPi of the static pressure difference before and after the control valve 3 for the control valve 3, and sets the minimum value among these values ΔPi as the head correction value ΔP of the cold / hot water circulation pump 2. That is, the lift correction value ΔP is expressed by the following equation.
ΔP = min (ΔP ₁ , ΔP ₂ ,..., ΔP _m ) (11)
Here, m is the number of control valves.

[Restriction of feedback control]
In the rotational speed control of the cold / hot water circulation pump 2 using the feedforward control and the feedback control, it is necessary to limit the size of the lift correction value ΔP for the feedback control.
| ΔP | ≦ K _L · P ₀ (12)
The head correction value calculation unit 208 calculates the head correction value ΔP of the cold / hot water circulation pump 2 according to the equation (11), and then limits the magnitude of the head correction value ΔP according to the equation (12). In Equation (12), K _L is a feedback control magnitude limiting rate, for example, K _L = 0.1.

[Combination of feedforward control and feedback control]
Then, lift setting value calculation unit 209, and a lift predicted value P ₀ and lift correction value ΔP of cold and hot water circulation pump 2, and calculates the lift setting value H _SP of cold and hot water circulation pump 2 as follows.
H _SP = P ₀ −ΔP (13)

Lift deviation calculating section 210 calculates the difference ΔH between the lift measurement value H and lift setting value H _SP of hot and cold water circulation pump 2.
ΔH = H−H _SP (14)

Rotational speed control calculation unit 211, as the lift measurement value H and lift setting value H _SP match (i.e., lift deviation ΔH is such that 0) calculates the rotational speed n of the cold and hot water circulation pump 2. The rotation speed control device 8 controls the rotation speed of the cold / hot water circulation pump 2 to be n. With the configuration as described above, the refrigeration / warm water circulation pump rotation speed control system disclosed in Patent Document 2 can greatly improve the follow-up performance of the rotation speed control while suppressing hunting of the refrigeration / warm water circulation pump 2 rotation speed control. it can.

Japanese Patent No. 4213502 JP 2012-13344 A

In the system for controlling the number of revolutions of the chilled / hot water circulation pump shown in FIG. 7, if the control valve is hunted by the room temperature control operation of the air conditioner or the operation of another control valve, the number of revolutions control of the chilled / hot water circulation pump becomes unstable. There is a problem that a sufficient energy saving effect cannot be obtained. That is, the control valve opening phi is the much higher than the control valve opening setting value phi _SP, rotational speed n of the hot and cold water circulation pump is increased in order to return the control valve opening phi to control valve opening setting value phi _SP. On the other hand, the control valve opening phi falls below a large control valve opening setting value phi _SP, the rotation speed n of the hot and cold water circulation pump is lowered to return the control valve opening phi to control valve opening setting value phi _SP. Thus, the control of the rotational speed of the cold / hot water circulation pump becomes unstable due to the hunting of the control valve.

  Further, in the cold / hot water circulation pump rotation speed control system shown in FIG. 7, since the rotation speed n of the cold / hot water circulation pump and the control valve opening φ are not linked by a simple calculation formula, the load of the cold / hot water system greatly changes. However, in order to prevent hunting of the system, the change in the pump rotation speed is limited in the pump rotation speed control, which causes a problem that the follow-up performance of the pump rotation speed control is deteriorated.

  On the other hand, in the cold / hot water circulation pump rotation speed control system shown in FIG. 8, the stability of the pump rotation speed control by the hunting of the control valve can be improved, and the followability of the pump rotation speed control is also improved. However, there is a problem that a flow rate measurement function must be provided in the control valve. In addition, the cold / hot water circulation pump rotation speed control system shown in FIG. 8 has a problem that it cannot be applied unless the flow characteristics of the control valve are clear.

  Therefore, there has been a problem that the applicable range is limited in the rotational speed control system of the cold / hot water circulation pump shown in FIG. For example, a small control valve for controlling an FCU is not equipped with a flow rate measurement function and the flow rate characteristics are not clarified. Therefore, the rotational speed control system as shown in FIG. 8 should be applied. It is difficult.

  The present invention has been made to solve the above-described problem, and can improve the stability and follow-up of the rotational speed control of the cold / hot water circulation pump, and has a wide range of application. And to provide a method.

  The number control system of the cold / hot water circulation pump of the present invention is supplied by a plurality of air conditioners, a plurality of control valves respectively provided in the supply pipes of the cold / hot water to the plurality of air conditioners, and the plurality of air conditioners. A plurality of temperature sensors that measure the temperature of the supply air or the indoor temperatures of a plurality of controlled areas to which supply air is supplied from the plurality of air conditioners, a cold / hot water circulation pump that circulates the cold / hot water, and the plurality A plurality of valve opening control means for controlling the opening of the control valve, a pressure sensor for measuring the head of the cold / hot water circulation pump, a total flow meter for measuring the flow of the cold / hot water passing through the return water pipe, and the cold / hot And a control valve with a flow rate measuring function for measuring the flow rate of the cold / hot water passing through the control valve, and a flow rate measuring function. Not include control valve and The valve opening degree control means corresponding to the control valve with the flow rate measurement function is such that the temperature of the supply air supplied by the corresponding air conditioner and the predetermined supply air temperature set value coincide with each other, or the corresponding temperature A flow rate control calculation means for calculating a flow rate set value so that a room temperature measured by the sensor and a predetermined room temperature set value match, and a control valve of the control valve so that the measured value of the flow rate and the flow rate set value match. The valve opening degree control means corresponding to the control valve not having the flow rate measuring function is supplied by a corresponding air conditioner. The opening degree of the control valve is controlled such that the temperature of the control valve matches the predetermined supply air temperature setting value, or the indoor temperature measured by the corresponding temperature sensor matches the predetermined indoor temperature setting value. The valve opening control calculation means, The rotation number control means is configured to control each control without the flow measurement function from the total flow measurement value measured by the total flow meter and the total flow measurement value measured by each control valve with the flow measurement function. The total value of the flow rate of the valve is calculated, the total value of the flow rate measurement value measured by each control valve with the flow rate measurement function, the total value of the flow rate increase of each control valve with the flow rate measurement function, and the flow rate measurement The head prediction for calculating the head prediction value of the cold / hot water circulation pump from the total value of the flow rate of each control valve not equipped with the function, the total flow measurement value measured by the total flow meter, and the head measurement value of the cold / hot water circulation pump A value setting means, a head setting value calculating means for calculating a head setting value of the cold / hot water circulation pump from the head prediction value, and a rotation speed of the cold / hot water circulation pump so that the head measurement value and the head setting value coincide with each other Control And a rotational speed control calculating means.

  Moreover, in one configuration example of the rotational speed control system for the cold / hot water circulation pump of the present invention, the rotational speed control means further includes all control valves or control valve opening degrees of control valves not provided with the flow rate measuring function. A feedback control strength determining means for selecting a maximum control valve opening from the above and determining a feedback control strength based on a difference between a predetermined fully opened opening and a maximum control valve opening; and the feedback control strength And a head correction value determining means for determining a head correction value of the cold / hot water circulation pump based on the head, and a head correction value of the cold / hot water circulation pump based on a capacity coefficient of any one of the plurality of control valves. A head correction value correcting means for correcting, and the head set value calculating means adds the head predicted value and the head correction value corrected by the head correction value correcting means to add the cold / hot water circulation position. It is characterized in calculating the lift setting value of flop.

  Further, the present invention provides a plurality of air conditioners, a plurality of control valves respectively provided in supply pipes of cold / hot water to the plurality of air conditioners, and a temperature of supply air supplied by the plurality of air conditioners, or A plurality of temperature sensors for measuring indoor temperatures of a plurality of controlled areas to which supply air is supplied from the plurality of air conditioners, a cold / hot water circulation pump for circulating the cold / hot water, and a pressure for measuring a head of the cold / hot water circulation pump In the air conditioning system comprising a sensor and a total flow meter for measuring the flow rate of the cold / hot water passing through the return water pipe, the method for controlling the number of rotations of the cold / hot water circulation pump for controlling the number of rotations of the cold / hot water circulation pump, A valve opening control step for controlling the opening of a plurality of control valves; and a rotation speed control step for controlling the rotation speed of the cold / hot water circulation pump. The plurality of control valves include cold / hot water passing through the control valve. The flow rate of A control valve with a flow rate measuring function to be measured and a control valve without a flow rate measuring function are included, and the valve opening control step corresponding to the control valve with the flow rate measuring function is supplied by the air conditioner The flow rate setting function sets the flow rate setting value so that the supply air temperature matches a predetermined supply air temperature setting value, or the indoor temperature measured by the corresponding temperature sensor matches the predetermined indoor temperature setting value. A first control valve for controlling the opening degree of each control valve with the flow rate measuring function so that the measured value of the flow rate and the flow rate set value coincide with each other. The valve opening control step corresponding to a control valve not provided with the flow rate measurement function includes an opening control calculation step, and the supply air temperature supplied by the air conditioner and a predetermined supply air temperature set value are Match or match A second valve opening degree control calculation step for controlling the opening degree of each control valve not provided with the flow rate measuring function so that the indoor temperature measured by the temperature sensor to be matched with a predetermined indoor temperature set value. The rotational speed control step does not have the flow measurement function from the total flow measurement value measured by the total flow meter and the total value of the flow measurement values measured by the control valves with the flow measurement function. The total value of the flow rate of each control valve is calculated, the total value of the flow rate measurement value measured by each control valve with the flow rate measurement function, the total increase value of the flow rate of each control valve with the flow rate measurement function, and the Calculate the predicted value of the head of the chilled / hot water circulation pump from the total value of the flow rate of each control valve without a flow rate measurement function, the measured value of the total flow measured by the total flow meter, and the measured value of the head of the chilled / hot water circulation pump Head prediction A value setting step, a head setting value calculating step for calculating a head setting value of the cold / hot water circulation pump from the head prediction value, and a rotation speed of the cold / hot water circulation pump so that the head measurement value and the head setting value coincide with each other And a rotational speed control calculation step for controlling the motor.

  Further, in one configuration example of the method for controlling the number of revolutions of the cold / hot water circulation pump according to the present invention, the number of revolutions control step further includes all control valves or control valve opening degrees of control valves not provided with the flow rate measuring function. A feedback control strength determining step for selecting a maximum control valve opening from the above, and determining a feedback control strength based on a difference between a predetermined fully opened opening and a maximum control valve opening; and the feedback control strength A head correction value determining step for determining a head correction value of the cold / hot water circulation pump based on the control value, and a head correction value of the cold / hot water circulation pump based on a capacity coefficient of any one of the plurality of control valves. A head correction value correction step for correcting, and the head setting value calculation step adds the head prediction value and the head correction value corrected in the head correction value correction step. Is characterized in calculating the lift set value of the hot and cold water circulation pumps Te.

  According to the present invention, the rotation speed control means is provided with the head predicted value calculation means, the head set value calculation means, and the rotation speed control calculation means, and controls the discharge pressure setting of the cold / hot water circulation pump (rotation speed control of the cold / hot water circulation pump). ), The stability and followability of the rotational speed control of the cold / hot water circulation pump can be improved. Furthermore, in the present invention, when calculating the head prediction value of the cold / hot water circulation pump, the total flow measurement value measured by the total flow meter and the total value of the flow measurement value measured by each control valve with a flow measurement function, The total value of the flow rate of each control valve without the flow rate measurement function is calculated from the flow rate of each control valve with the flow rate measurement function and the total value of the flow rate measurement value measured by each control valve with the flow rate measurement function. The estimated head of the chilled / hot water circulation pump is calculated from the total value of the increase, the total value of the flow of each control valve without the flow measurement function, the total flow measurement value measured by the total flow meter, and the measured value of the chilled / hot water circulation pump. Because it is calculated, the stability and follow-up of the rotational speed control of the chilled / hot water circulation pump, even in an air conditioning system that has both a control valve with a flow measurement function and a control valve without a flow measurement function And improving Can, it is possible to widen the application range as compared with the conventional.

  Further, in the present invention, by providing the rotation speed control means with the feedback control strength determination means, the lift correction value determination means and the lift correction value correction means, the lift correction value of the cold / hot water circulation pump can be corrected, The head setting value of the cold / hot water circulation pump can be calculated.

It is a block diagram which shows the structure of the air conditioning system containing the rotation speed control system of the cold / hot water circulation pump which concerns on embodiment of this invention. It is a block diagram which shows the structure of the opening degree control system of the control valve which is not attached with the flow measurement function. It is a block diagram which shows the structure of the opening degree control system of a control valve with a flow measurement function. It is a block diagram which shows the structure of the rotation speed control system of the cold / hot water circulation pump which concerns on embodiment of this invention. It is a figure which shows one example of the relationship between a control valve opening difference and feedback control strength. It is a figure explaining the calculation method of the head correction value of a cold / hot water circulation pump. It is a block diagram which shows the structure of the rotation speed control system of the conventional cold / hot water circulation pump. It is a block diagram which shows the other structure of the rotation speed control system of the conventional cold / hot water circulation pump.

[Principle of the Invention]
The present invention introduces the following configurations (A) to (E) in order to solve the problems of the prior art.

  (A) In order to control the control valve opening, a missing feedforward control amount is introduced. In the feedforward control performed in accordance with the increase ΔQ of the control valve flow rate, the control valve flow rate increase ΔQ is lost for a control valve without a flow rate measurement function. Introduce. Specifically, the increase ΔQ in the flow rate of the control valve without the flow rate measurement function is set to zero.

(B) The calculated flow rate is introduced. For a control valve without a flow rate measurement function, the flow rate of the control valve is calculated by the difference between the system flow rate measurement value measured by the total flow meter and the flow rate measurement value of the control valve with the flow rate measurement function.
ΣQ _nm = Q _total −ΣQ _md (15)
In equation (15), ΣQ _nm is the total value of the flow rate of the control valve without the flow rate measurement function, Q _total is the system flow rate measurement value measured by the total flow meter, and ΣQ _md is measured by the control valve with the flow rate measurement function It is the total value of the measured flow rate values.

(C) The head prediction value P ₀ of the cold / hot water circulation pump is calculated by the missing feedforward control amount.

  In Expression (16), H is the measured value of the head of the cold / hot water circulation pump, and ΣΔQ is the total value of the increase in the flow rate of the control valve with the flow rate measurement function.

(D) Introduce feedback control strength. For control valves that do not have a flow rate measurement function or whose control valve flow rate characteristics are not clearly defined, lift, valve opening and maximum opening that require correction to increase or decrease the rotation speed of the cold / hot water circulation pump The correction value of the number of revolutions of the cold / hot water circulation pump or pump head is set according to the difference of
Specifically, control valve opening φ is obtained from a control valve that does not have a flow rate measurement function or all control valves, and the maximum opening is selected from these control valve openings φ as shown in the following equation. A certain control valve opening φ _max is selected.
φ _max = max (φ ₁ , φ ₂ , φ ₃ ,...) (17)

Then, a difference Δφ between the fully opened opening φ _full and the maximum opening φ _{max of} the control valve defined in advance is calculated.
Δφ = φ _full −φ _max (18)
Here, the fully opened opening φ _full can be set to a specific opening value, for example, φ _full = 95%, or can be set to a certain range, for example, φ _full = 90 to 95%. It is.

The feedback control strength P _power is determined by the difference Δφ between the fully opened opening φ _full and the maximum opening φ _max of the control valve.
P _ower = f ₁ (Δφ) (19)
In the equation (19), f ₁ is a predefined function.

Then, the rotation speed of the cold / hot water circulation pump or the head correction value ΔP _standard of the cold / hot water circulation pump is set according to the feedback control strength _Power .
ΔP _standard = f ₂ (P _ower ) (20)
In equation (20), f ₂ is a predefined function.

  (E) Introducing a weighting factor. For control valves that do not have a flow rate measurement function or whose control valve flow rate characteristics are not clarified, the capacity coefficient (Cv value) of the control valve is different. It is effective to set a different cold / hot water circulation pump rotation speed or a cold / hot water circulation pump head correction value.

Since it is inefficient to have a table that sets the number of rotations of the chilled / hot water circulation pump or the head / head correction value of the chilled / hot water circulation pump according to the feedback control strength for each control valve, it differs by multiplying the standard table by a weight coefficient Set a different chilled / hot water circulation pump speed or head correction value to the capacity coefficient control valve. More specifically, the ratio W obtained by using the capacity coefficient Cv _standard of a standard control valve recorded in advance in the standard table as the denominator and the capacity coefficient Cv of a certain control valve as the numerator is used as the control valve to be controlled. The weighting factor of
W = Cv / Cv _standard (21)

The number of rotations of the chilled / hot water circulation pump or the head of the chilled / hot water circulation pump to be controlled is multiplied by the weight coefficient W by the rotation number of the chilled / hot water circulation pump obtained by the feedback control strength _Power or the lift correction value ΔP _standard of the chilled / hot water circulation pump Set the value ΔP.
ΔP = W · ΔP _standard (22)

[Embodiment]
Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a block diagram showing a configuration of an air conditioning system including a rotational speed control system for a cold / hot water circulation pump according to an embodiment of the present invention. The air conditioning system includes air conditioners 1-1 to 1-5, cold / hot water circulation pump 2, control valves 3-1 to 3-5, controllers 4-1 to 4-5, and temperature sensors 6-1. 6-5, a pressure sensor 7, a rotation speed control device 8, a forward water pipeline 9, a return water pipeline 10, headers 11 to 14, and a total flow meter 15. In the example of FIG. 1, the case where AHU is used as the air conditioners 1-1 to 1-3 and the FCU is used as the air conditioners 1-4 and 1-5 is described.

  The cold / hot water to which pressure is applied by the cold / hot water circulation pump 2 is sent out from the header 14 and supplied to the air conditioners 1-1 to 1-5 through the outgoing water pipeline 9. And the cold / hot water is heat-exchanged in the air conditioners 1-1 to 1-5, and returned to the cold / hot water circulation pump 2 through the control valves 3-1 to 3-5, the return water pipe 10, and the headers 11 to 13, It is again pumped by the cold / hot water circulation pump 2. Cold and hot water circulates through the above-described path.

The supply air (cold air or hot air) generated in each of the air conditioners 1-1 to 1-5 is supplied to the corresponding controlled area. Each temperature sensor 6-1 to 6-5 measures the temperature t of the supply air supplied from the air conditioners 1-1 to 1-5 to the controlled area.
Each controller 4-1 to 4-5 controls the amount of cold / hot water passing through the air conditioners 1-1 to 1-5 by controlling the opening degree of the corresponding control valves 3-1 to 3-5. Then, load control of the air conditioners 1-1 to 1-5 is performed.

The pressure sensor 7 measures the head H of the cold / hot water circulation pump 2 by subtracting the suction pressure of the cold / hot water circulation pump 2 from the discharge pressure of the cold / hot water circulation pump 2.
The controller 5 controls the rotational speed of the cold / hot water circulation pump 2 through the rotational speed control device 8. The total flow meter 15 measures the flow rate of cold / hot water passing through the return water pipe 10.

In the present embodiment, control valves with a flow rate measurement function and control valves without a flow rate measurement function are mixed in the control valves 3-1 to 3-5. FIG. 2 is a block diagram showing a configuration of an opening degree control system of a control valve without a flow rate measuring function. In the configuration shown in FIG. 2, the temperature deviation calculation unit 201 calculates a deviation Δt = t−t _SP between the supply air temperature measurement value t and the supply air temperature set value t _SP . The valve opening control calculation unit 202 sets the control valve opening φ so that the measured supply air temperature t matches the supply air temperature setting value t _SP (that is, the supply air temperature deviation Δt becomes 0). Control. Thus, in the control valve 3 without the flow measurement function, the opening degree of the control valve 3 is controlled according to the deviation of the supply air temperature. Reference numeral 216 in FIG. 2 denotes a heat exchanger.

FIG. 3 is a block diagram showing a configuration of an opening degree control system of a control valve with a flow rate measuring function. A flow rate measurement function unit 203 (or a flow meter provided in a pipe line) of the control valve 3 measures the flow rate of cold / hot water passing through the control valve 3. The flow rate control calculation unit 204 calculates the flow rate set value Q _SP so that the supply air temperature measurement value t matches the supply air temperature set value t _SP (that is, the supply air temperature deviation Δt becomes 0). . The flow rate deviation calculation unit 205 calculates a deviation ΔQ = Q _SP −Q between the flow rate measurement value Q and the flow rate set value Q _SP . The valve opening control calculation unit 206 controls the control valve opening φ so that the flow rate measurement value Q and the flow rate set value Q _SP coincide (that is, the flow rate deviation ΔQ becomes 0).

FIG. 4 is a block diagram showing the configuration of the rotational speed control system of the cold / hot water circulation pump of the present embodiment. In FIG. 4, only one control valve 3 (3-1 to 3-5) and one controller 4 (4-1 to 4-5) are shown. The head prediction value calculation unit 212 includes a flow rate setting value Q _SP of each control valve 3 with a flow rate measurement function, a flow rate measurement value Q measured by each control valve 3 with a flow rate measurement function, and a head measurement value of the cold / hot water circulation pump 2. A head prediction value P ₀ of the cold / hot water circulation pump 2 is calculated from H and the flow rate measurement value Q _total measured by the total flow meter 15.

Feedback control strength calculating unit 213 calculates a feedback control intensity P _ower on the basis of the difference Δφ between the fully opened opening phi _full and maximum opening phi _max of the control valve. The head correction value calculation unit 214 calculates the head correction value ΔP _standard of the cold / hot water circulation pump 2 based on the feedback control strength _Power . The head correction value correction unit 215 multiplies the head correction value ΔP _standard of the cold / hot water circulation pump 2 calculated by the head correction value calculation unit 214 by the weighting factor W corresponding to the control valve 3 to be controlled, and A head correction value ΔP is calculated.

Lift setting value calculation unit 209 adds up the the lift correction value ΔP lift predicted value P ₀ of the hot and cold water circulation pump 2, and calculates the lift setting value H _SP of cold and hot water circulation pump 2. Lift deviation calculating section 210 calculates the difference ΔH between the lift measurement value H and lift setting value H _SP of hot and cold water circulation pump 2.

Rotational speed control calculation unit 211, as the lift measurement value H and lift setting value H _SP match (i.e., lift deviation ΔH is such that 0) calculates the rotational speed n of the cold and hot water circulation pump 2. The rotation speed control device 8 controls the rotation speed of the cold / hot water circulation pump 2 to be n. Among the above configurations, the head set value calculation unit 209, the head deviation calculation unit 210, the rotation speed control calculation unit 211, the head prediction value calculation unit 212, the feedback control strength calculation unit 213, the head correction value calculation unit 214, and the head correction The value correction unit 215 is provided inside the controller 5. Hereinafter, the operation of the present embodiment will be described in more detail.

[Required flow rate and control valve opening]
Among the controllers 4-1 to 4-5, the controller 4 that controls the control valve 3 that does not have a flow measurement function includes the temperature deviation calculation unit 201 and the valve opening control calculation unit 202 shown in FIG. 2 inside. Have. The temperature deviation calculation unit 201 calculates a deviation Δt = t−t _SP between the supply air temperature measurement value t and the supply air temperature set value t _SP . The valve opening control calculation unit 202 sets the control valve opening φ so that the measured supply air temperature t matches the supply air temperature setting value t _SP (that is, the supply air temperature deviation Δt becomes 0). Control. Such a calculation is performed for each controller 4 corresponding to the control valve 3 without the flow rate measuring function.

On the other hand, among the controllers 4-1 to 4-5, the controller 4 that controls the control valve 3 with a flow rate measurement function includes the temperature deviation calculation unit 201 and the flow rate control calculation unit 204 shown in FIG. As described above, the temperature deviation calculation unit 201 calculates the deviation Δt = t−t _SP , and the flow rate control calculation unit 204 makes the supply air temperature measurement value t and the supply air temperature set value t _SP match ( That is, the flow rate set value Q _SP is calculated (so that the supply air temperature deviation Δt becomes 0), and a required flow rate signal indicating this flow rate set value Q _SP is transmitted to the corresponding control valve 3. Such a calculation is performed for each controller 4 corresponding to the control valve 3 with the flow rate measuring function.

Among the control valves 3-1 to 3-5, the control valve 3 with a flow rate measurement function includes the flow rate measurement function unit 203, the flow rate deviation calculation unit 205, and the valve opening degree control calculation unit 206 illustrated in FIG. 3. The flow rate deviation calculation unit 205 calculates a deviation ΔQ = Q _SP −Q between the flow rate measurement value Q measured by the flow rate measurement function unit 203 and the flow rate setting value Q _SP indicated by the request flow rate signal transmitted from the controller 4. The valve opening control calculation unit 206 controls the control valve opening φ so that the flow rate measurement value Q and the flow rate set value Q _SP coincide (that is, the flow rate deviation ΔQ becomes 0). Such valve opening degree control is performed for each control valve 3 with a flow rate measurement function. Instead of the flow rate measurement function unit 203, a flow meter may be provided in each forward water pipe 10 immediately after the control valve 3 to measure the flow rate.

[Feed forward control]
The controller 5 that controls the chilled / hot water circulation pump 2 includes the requested flow rate signal sent from the controller 4 that controls the control valve 3 with the flow rate measuring function among the controllers 4-1 to 4-5, and all the controller 4- 1 to 4-5, a control valve opening degree signal, a flow rate measurement value sent from the control valve 3 with a flow rate measurement function through the controller 4, and a cold / hot water circulation pump 2 sent from the pressure sensor 7 The rotational speed control of the cold / hot water circulation pump 2 is performed based on the measured value of the head and the measured flow value measured by the total flow meter 15.

The head prediction value calculation unit 212 of the controller 5 collects and sums the flow rate measurement values Q measured by the control valves 3 with the flow rate measurement function, and calculates the total value ΣQ _md of the flow rate measurement values.
ΣQ _md = Σ (Q ₁ + Q ₂ + Q ₃ +...) (23)

Lift predicted value calculation unit 212 obtains the required flow rate signal transmitted from the controller 4 for controlling the control valve 3 with the flow rate measuring function, and obtains the flow setpoint Q _SP indicated by the required flow rate signal, flow rate A deviation ΔQ = Q _SP −Q between the set value Q _SP and the flow rate measurement value Q is calculated as an increase in the cold / hot water flow rate. The head prediction value calculation unit 212 performs such calculation for each control valve 3 with a flow rate measurement function. Then, the head prediction value calculation unit 212 sums up the flow amount increase ΔQ of each control valve 3 with the flow rate measurement function, and calculates the total value ΣΔQ of the flow amount increase.
ΣΔQ = Σ (ΔQ ₁ + ΔQ ₂ + ΔQ ₃ +...) (24)

Subsequently, the head prediction value calculation unit 212 does not have a flow measurement function from the flow measurement value Q _total measured by the total flow meter 15 and the total value ΣQ _md of the flow measurement values calculated by the equation (23). The total value ΣQ _nm of the flow rate of the control valve 3 is calculated as in equation (15).
Finally, the head prediction value calculation unit 212 includes a total value ΣQ _md of the flow rate measurement value, a total value ΣΔQ of the increase in flow rate, a total value ΣQ _nm of the flow rate of the control valve 3 without the flow rate measurement function, and the total flow meter 15. From the flow rate measurement value Q _total measured by the above and the head measurement value H of the chilled / hot water circulation pump 2 sent from the pressure sensor 7, the head prediction value P ₀ of the chill / warm water circulation pump 2 is calculated as in equation (16). .

[Feedback control]
On the other hand, the feedback control strength calculation unit 213 of the controller 5 controls all the controllers 4-1 to 4-5, or the controller 4-1 to 4-5 that controls the control valve 3 that does not have a flow measurement function. 4 is acquired, and the maximum control valve opening φ _max is selected from the control valve opening φ indicated by these control valve opening signals as shown in Expression (17). .

Subsequently, the feedback control strength calculation unit 213 calculates a difference Δφ between the fully-opened opening φ _full of the control valve defined in advance and the maximum control valve opening φ _max as shown in Expression (18). Then, the feedback control strength calculation unit 213 determines whether or not the chilled / hot water circulation pump 2 has a lift (pump lift, pump lift) based on the value of Δφ. If Δφ <0, the feedback control strength calculation unit 213 determines that the lift is increased, that is, ΔP> 0. If Δφ = 0, the feedback control strength calculation unit 213 determines that the head is maintained, that is, ΔP = 0. If Δφ> 0, the feedback control strength calculation unit 213 determines that the lift is reduced, that is, ΔP <0.

Then, the feedback control strength calculation unit 213 determines the feedback control strength _Power as shown in Expression (19) based on the control valve opening difference Δφ. FIG. 5 is a diagram showing an example of the relationship between the control valve opening difference Δφ and the feedback control strength _Power . If the relationship between the control valve opening difference Δφ and the feedback control strength _Power is defined by an exponential characteristic, the feedback control strength _{Power with} respect to the control valve opening difference Δφ becomes _{Power, 1} shown in FIG. A function f ₁ in the case where the relationship between the control valve opening difference Δφ and the feedback control strength _Power is defined by exponential characteristics is shown below.
P _ower = K ^φfull-1 −K ^φ-1 (25)

K is a predetermined coefficient, for example, K = 30, 50, 100. Further, if the relationship between the control valve opening degree difference Δφ and the feedback control strength P _power is defined by linear characteristics, the feedback control strength P _power for the control valve opening degree difference Δφ is _{Power, 2} shown in FIG. Become. A function f ₁ in the case where the relationship between the control valve opening difference Δφ and the feedback control strength _Power is defined by linear characteristics is shown below.
_{P ower = (1 / K)} · [(K-1) · φ full - (K-1) · φ] ··· (26)
Thus, the feedback control strength P _power can be determined based on the control valve opening difference Δφ.

Next, the head correction value calculation unit 214 of the controller 5 calculates the head correction value ΔP _standard of the cold / hot water circulation pump 2 based on the feedback control strength P _power . FIG. 6 is a diagram illustrating a method for calculating the head correction value ΔP _standard of the cold / hot water circulation pump 2. As shown in FIG. 6, the _relationship between the feedback control strength _Power , the rotational speed n of the cold / hot water circulation pump 2 and the head correction value ΔP _standard of the cold / hot water circulation pump 2 can be defined by a function. For example, when the rotation speed n of the cold / hot water circulation pump 2 is 1000 rpm, the lift correction value ΔP _standard of the cold / hot water circulation pump 2 is calculated as follows.
ΔP _standard = K _{n = 1000} · _Power (27)

K _{n = 1000} is a coefficient defined in advance corresponding to n = 1000 rpm. Moreover, when the rotation speed n of the cold / hot water circulation pump 2 is 100 rpm, the lift correction value ΔP _standard of the cold / hot water circulation pump 2 is calculated as follows.
ΔP _standard = K _{n = 100} · _Power (28)

K _{n = 100} is a coefficient defined in advance corresponding to n = 100 rpm. Moreover, when the rotation speed n of the cold / hot water circulation pump 2 is between 100 rpm and 1000 rpm, the head correction value ΔP _standard of the cold / hot water circulation pump 2 is calculated as follows.

In Equation (29), n ₁₀₀₀ is the rotation speed at n = 1000 rpm, and n ₁₀₀ is the rotation speed at n = 100 rpm. Thus, the head correction value ΔP _standard of the cold / hot water circulation pump 2 can be determined based on the feedback control strength _Power .
Next, the head correction value correction unit 215 of the controller 5 multiplies the head correction value ΔP _standard of the cold / hot water circulation pump 2 calculated by the head correction value calculation unit 214 by a weighting factor W corresponding to the control valve 3 to be controlled. Then, the head correction value ΔP of the cold / hot water circulation pump 2 is calculated.

As described above, in the control valve 3 that does not have a flow rate measurement function or whose control valve flow rate characteristics are not clarified, the capacity coefficient (Cv value) of the control valve is different. It is effective to correct the ΔP _standard using the control valve capacity coefficient.
Specifically, the head correction value correction unit 215 uses the capacity coefficient Cv _standard of the standard control valve recorded in advance in the standard table as the denominator, and controls the control valve among the control valves 3-1 to 3-5. The ratio W obtained by using the capacity coefficient Cv of the control valve 3 having the maximum opening φ as a numerator is used as a weighting coefficient of the control valve 3 (formula (21)).

Then, the head correction value correction unit 215 corrects the head correction value ΔP of the cold / hot water circulation pump 2 by multiplying the weight correction value W by the head correction value ΔP _standard of the cold / hot water circulation pump 2 as shown in Expression (22).

[Combination of feedforward control and feedback control]
The head setting value calculation unit 209 of the controller 5 adds the head prediction value P ₀ of the cold / hot water circulation pump 2 and the head correction value ΔP, and calculates the head setting value H _SP of the cold / hot water circulation pump 2 as follows. .
H _SP = P ₀ + ΔP (30)
Alternatively, lift setting value calculation unit 209 may calculate the lift setting value H _SP of hot and cold water circulation pump 2 by the equation (13).

Lift deviation calculation unit 210 of the controller 5 calculates the difference ΔH between the lift measurement value H and lift setting value H _SP of hot and cold water circulation pump 2 by the equation (14).
Rotational speed control calculation unit 211, as the lift measurement value H and lift setting value H _SP match (i.e., lift deviation ΔH is such that 0) calculates the rotational speed n of the cold and hot water circulation pump 2. The rotation speed control device 8 controls the rotation speed of the cold / hot water circulation pump 2 to be n.

  With the configuration as described above, in the present embodiment, even in an air conditioning system in which a control valve with a flow rate measurement function and a control valve without a flow rate measurement function are mixed, the number of revolutions of the cold / hot water circulation pump 2 The stability and followability of control can be improved, and the application range can be expanded as compared with the system disclosed in Patent Document 2.

In addition, since the head of the cold / hot water circulation pump 2 and the rotational speed of the cold / hot water circulation pump 2 satisfy the following formula, the rotational speed n of the cold / hot water circulation pump 2 is immediately calculated without setting the head of the cold / hot water circulation pump 2, It is also possible to control the rotation speed of the cold / hot water circulation pump 2.
n ₁ = (P ₁ / P ₂ ) ^0.5 · n ₂ (31)

In this embodiment, the case where AHU is mainly used as an air conditioner has been described. However, when an FCU is used as an air conditioner, the following may be performed. That is, when the FCU is used as the air conditioner 1 (1-1 to 1-5), the temperature sensors 6 (6-1 to 6-5) are indoors in the controlled area to which the air supply from the air conditioner 1 is supplied. The temperature t is measured. The temperature deviation calculation unit 201 shown in FIGS. 2 and 3 calculates a deviation Δt = t−t _SP between the indoor temperature measurement value t and a predetermined indoor temperature setting value t _SP . The valve opening degree control calculation unit 202 shown in FIG. 2 controls the opening degree of the control valve so that the measured indoor temperature value t matches the indoor temperature set value t _SP (that is, the indoor temperature deviation Δt becomes 0). Control φ. The flow rate control calculation unit 204 shown in FIG. 3 sets the flow rate set value Q _SP so that the measured indoor temperature value t matches the indoor temperature set value t _SP (that is, the indoor temperature deviation Δt becomes 0). calculate. Other configurations are as described above.

  Each of the controllers 4-1 to 4-5 and 5 according to the present embodiment can be realized by a computer having a CPU, a storage device, and an external interface, and a program for controlling these hardware resources. The CPU of each controller executes the processing described in this embodiment in accordance with a program stored in the storage device. Similarly, the flow rate deviation calculation unit 205 and the valve opening control calculation unit 206 in the control valve 3 with a flow rate measurement function include a computer having a CPU, a storage device, and an external interface, and these hardware resources. It can be realized by a program to be controlled. The CPU of the control valve 3 with the flow rate measurement function executes the processing described in the present embodiment in accordance with a program stored in the storage device.

  The present invention can be applied to a technique for controlling the number of rotations of a cold / hot water circulation pump that circulates cold / hot water supplied to an air conditioner in an air conditioning system.

  1-1 to 1-5 ... air conditioner, 2 ... chilled / hot water circulation pump, 3-1 to 3-5 ... control valve, 4-1 to 4-5, 5 ... controller, 6-1 to 6-5 ... temperature sensor DESCRIPTION OF SYMBOLS 7 ... Pressure sensor 8 ... Rotational speed control device 9 ... Outbound pipeline, 10 ... Return water pipeline, 11-14 ... Header, 15 ... Total flowmeter, 201 ... Temperature deviation calculation part, 203 ... Flow measurement function part , 204 ... Flow rate control calculation unit, 203 ... Flow rate measurement function unit, 205 ... Flow rate deviation calculation unit, 206 ... Valve opening control calculation unit, 209 ... Lifting head set value calculation unit, 210 ... Lifting deviation calculation unit, 211 ... Number of rotations Control calculation unit, 212... Predicted head value calculation unit, 213... Feedback control strength calculation unit, 214... Lift correction value calculation unit, and 215.

Claims (4)

Multiple air conditioners,
A plurality of control valves respectively provided in supply pipes of cold / hot water to the plurality of air conditioners;
A plurality of temperature sensors for measuring temperatures of supply air supplied by the plurality of air conditioners, or indoor temperatures of a plurality of controlled areas to which supply air is supplied from the plurality of air conditioners;
A cold / hot water circulation pump for circulating the cold / hot water;
A plurality of valve opening control means for controlling the opening of the plurality of control valves;
A pressure sensor for measuring the head of the cold / hot water circulation pump;
A total flow meter that measures the flow of cold and hot water passing through the return water line,
A rotation speed control means for controlling the rotation speed of the cold / hot water circulation pump;
The plurality of control valves include a control valve with a flow rate measurement function for measuring the flow rate of cold / hot water passing through the control valve, and a control valve without a flow rate measurement function,
The valve opening control means corresponding to the control valve with the flow rate measuring function is
The supply air temperature supplied by the corresponding air conditioner and the predetermined supply air temperature setting value are matched, or the indoor temperature measured by the corresponding temperature sensor is matched with the predetermined indoor temperature setting value. Flow rate control calculation means for calculating a flow rate set value;
A first valve opening degree control calculating means for controlling the opening degree of the control valve so that the measured value of the flow rate and the flow rate set value match,
The valve opening control means corresponding to the control valve without the flow rate measurement function,
The supply air temperature supplied by the corresponding air conditioner and the predetermined supply air temperature setting value are matched, or the indoor temperature measured by the corresponding temperature sensor is matched with the predetermined indoor temperature setting value. A second valve opening control calculating means for controlling the opening of the control valve;
The rotation speed control means includes
From the total flow measurement value measured by the total flow meter and the total flow measurement value measured by each control valve with the flow measurement function, the total flow value of each control valve without the flow measurement function And the total value of the flow rate measurement values measured by each control valve with the flow rate measurement function, the total value of the increase in the flow rate of each control valve with the flow rate measurement function, and each without the flow rate measurement function A head predicted value calculation means for calculating a head predicted value of the cold / hot water circulation pump from a total value of the flow rate of the control valve, a total flow measurement value measured by the total flow meter, and a head measurement value of the cold / hot water circulation pump;
A head setting value calculating means for calculating a head setting value of the cold / hot water circulation pump from the head prediction value;
A system for controlling the rotational speed of a chilled / hot water circulation pump, comprising: a rotational speed control calculation means for controlling the rotational speed of the chilled / hot water circulation pump so that the measured head value and the head setting value coincide with each other. In the rotation number control system of the cold / hot water circulation pump according to claim 1,
The rotation speed control means includes
Furthermore, the maximum control valve opening is selected from the control valve openings of all the control valves or the control valves not equipped with the flow rate measuring function, and the predetermined fully open opening and the maximum control valve opening Feedback control strength determination means for determining feedback control strength based on the difference between
A head correction value determining means for determining a head correction value of the cold / hot water circulation pump based on the feedback control strength;
A head correction value correcting means for correcting a head correction value of the cold / hot water circulation pump based on a capacity coefficient of any one of the plurality of control valves;
The head setting value calculation means calculates the head setting value of the cold / hot water circulation pump by adding the head prediction value and the head correction value corrected by the head correction value correction means. Speed control system. From a plurality of air conditioners, a plurality of control valves respectively provided in the supply pipes of cold / hot water to the plurality of air conditioners, and temperatures of supply air supplied by the plurality of air conditioners, or from the plurality of air conditioners A plurality of temperature sensors for measuring indoor temperatures of a plurality of controlled areas to which supply air is supplied, a cold / hot water circulation pump for circulating the cold / hot water, a pressure sensor for measuring a head of the cold / hot water circulation pump, and a return water pipe An air conditioning system including a total flow meter for measuring the flow rate of the cold / hot water passing through the cold / hot water circulation pump, the rotation number control method for controlling the rotation number of the cold / hot water circulation pump,
A valve opening control step for controlling the opening of the plurality of control valves;
A rotation speed control step for controlling the rotation speed of the cold / hot water circulation pump,
The plurality of control valves include a control valve with a flow rate measurement function for measuring the flow rate of cold / hot water passing through the control valve, and a control valve without a flow rate measurement function,
The valve opening control step corresponding to the control valve with the flow rate measuring function is:
Flow rate setting so that the temperature of the supply air supplied by the air conditioner matches a predetermined supply air temperature setting value, or the indoor temperature measured by the corresponding temperature sensor matches the predetermined indoor temperature setting value A flow control calculation step for calculating a value for each control valve with the flow measurement function;
A first valve opening degree control calculation step for controlling the opening degree of each control valve with the flow rate measuring function so that the measured value of the flow rate and the flow rate set value match,
The valve opening control step corresponding to the control valve without the flow rate measurement function,
The flow rate so that the temperature of the supply air supplied by the air conditioner matches a predetermined supply air temperature setting value, or the indoor temperature measured by the corresponding temperature sensor matches the predetermined indoor temperature setting value. It consists of a second valve opening degree control calculation step for controlling the opening degree of each control valve without a measurement function,
The rotation speed control step includes:
From the total flow measurement value measured by the total flow meter and the total flow measurement value measured by each control valve with the flow measurement function, the total flow value of each control valve without the flow measurement function And the total value of the flow rate measurement values measured by each control valve with the flow rate measurement function, the total value of the increase in the flow rate of each control valve with the flow rate measurement function, and each without the flow rate measurement function A head predicted value calculation step for calculating a head predicted value of the cold / hot water circulation pump from a total value of the flow rate of the control valve, a total flow measurement value measured by the total flow meter, and a head measurement value of the cold / hot water circulation pump;
A head setting value calculating step for calculating a head setting value of the cold / hot water circulation pump from the head prediction value;
A method for controlling the number of revolutions of a chilled / hot water circulation pump, comprising: a revolution number control calculation step for controlling the number of revolutions of the chilled / hot water circulation pump so that the measured head value and the head setting value coincide with each other. In the cold / hot water circulation pump rotation speed control method according to claim 3,
The rotation speed control step includes:
Furthermore, the maximum control valve opening is selected from the control valve openings of all the control valves or the control valves not equipped with the flow rate measuring function, and the predetermined fully open opening and the maximum control valve opening A feedback control strength determination step for determining feedback control strength based on the difference between
A head correction value determining step for determining a head correction value of the cold / hot water circulation pump based on the feedback control strength;
A head correction value correcting step for correcting a head correction value of the cold / hot water circulation pump based on a capacity coefficient of any one of the plurality of control valves;
The head setting value calculation step calculates the head setting value of the cold / hot water circulation pump by adding the head prediction value and the head correction value corrected in the head correction value correction step. Speed control method.

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