JP4691582B2 - Control device for air conditioning secondary pump - Google Patents

Description

  The present invention, for example, controls the discharge pressure of the air-conditioning water when supplying air-conditioning water from the secondary air-conditioning pump through the pipe to the air-conditioner installed in the air-conditioning target room. The present invention relates to a control device for the next pump.

  Conventionally, for example, when supplying cooling air for cooling or warming water for heating through a pipe from an air conditioning secondary pump to an air conditioner installed in an air conditioning target room, the air conditioning secondary pump according to the flow rate of the air conditioning water The so-called estimated terminal pressure control is performed to determine the discharge pressure set value of the air, and the discharge pressure of the air-conditioning water is controlled based on one predetermined pressure setting function to ensure the required flow rate of the air-conditioning water. (See Non-Patent Document 1).

However, when the discharge pressure of the water for air conditioning from the air conditioning secondary pump based on one pressure setting function determined in advance by the estimated terminal pressure control is controlled as in the prior art, the required pressure that changes depending on the operating state of the air conditioner is reduced. In order to ensure that the pressure setting function must always be determined to be a higher discharge pressure, if the required discharge pressure is small, the pump will be operated at an excessive discharge pressure, resulting in excessive pump pressure. This causes a problem that extra energy is used. On the other hand, if the pressure setting function is determined to be a lower discharge pressure than the required discharge pressure, the air conditioning water flow becomes insufficient and air conditioning becomes difficult to perform, and proper air conditioning control cannot be performed. The problem arises.
"Energy Saving Center" Improvement of pump selection and system Yoshio Sato Tsutomu Takada Copyright issue issued on June 12, 1993

  Therefore, in the present invention, it is an object to be solved to provide a control device for an air conditioning secondary pump that can perform appropriate air conditioning control and has a large energy saving effect.

The above problem can be solved by the control device for the air conditioning secondary pump described in the appended claims.
According to the control device for an air conditioning secondary pump according to claim 1, when supplying cooling air or air conditioning water from the air conditioning secondary pump to the air conditioner, the air conditioning is rotated at a variable speed. Air-conditioning secondary pump that varies the discharge pressure of water, a temperature detector that detects the temperature of the air-conditioning target location, an air-conditioning temperature controller that sets the air-conditioning temperature of the air-conditioning target location, and the air-conditioning secondary pump A pressure detector that detects the discharge pressure of the air-conditioning water, and controls the discharge pressure of the air-conditioning water discharged from the air-conditioning secondary pump according to a deviation between the air-conditioning set temperature and the actual temperature of the air-conditioning target location In a control device for an air conditioning secondary pump comprising a pressure control means,
Pressure setting function calculating means for calculating a pressure setting function representing the relationship between the flow rate of the air conditioning water supplied from the air conditioning secondary pump and the discharge pressure is provided, and the pressure setting function calculating means is provided at each of the air conditioning target locations. As the deviation between the set air-conditioning temperature and the actual temperature, calculate (actual temperature-air-conditioning temperature set value) during cooling, and calculate (air-conditioning temperature set value-actual temperature) during heating. The maximum value of the deviation at that time is monitored, and when the maximum value exceeds a predetermined first judgment reference temperature deviation, it is within the range of the predetermined upper limit pressure setting function and the lower limit pressure setting function. When the pressure setting function is changed in the direction of increasing the discharge pressure setting value, and the maximum value falls below the second determination reference temperature deviation lower than the first determination reference temperature deviation, the discharge pressure By setting values for changing the pressure setting function in the direction of lower, it is possible to realize a proper air-conditioning control and energy conservation.

According to the control device for an air conditioning secondary pump according to claim 2, the pressure setting function calculation means performs an air conditioning as a calculated pressure setting function and an upper limit pressure setting function and a lower limit pressure setting function that define a variable range thereof. For the predetermined set of maximum flow value and discharge pressure maximum value for water, substitute the above maximum flow value into the calculated pressure setting function, upper limit pressure setting function, and lower limit pressure setting function, respectively. A function is calculated and set so that the discharge pressure is always the maximum discharge pressure value.

  According to the present invention, there is an effect that it is possible to perform proper air conditioning and to perform air conditioning control with a large energy saving effect.

Next, an embodiment of the present invention will be described.
In FIG. 1, an air-conditioning secondary pump 2 that discharges and supplies air-conditioning water for cooling or heating air from an air-conditioning heat source (not shown) to air-conditioners (1 to N) provided in each room of an office, for example. In order to control the pressure, a pressure control unit 3 is provided.
As shown in FIG. 1, the air conditioning secondary pump 2 is driven by a motor (not shown), and this motor is driven at a variable speed by an inverter 4.
A pipe 5 for supplying the air-conditioning water discharged from the air-conditioning secondary pump 2 to the air conditioner (1 to N) is provided, and the air-conditioning water discharged from the air-conditioning secondary pump 2 is provided along the pipe 5. A pressure detector 6 for detecting the discharge pressure is provided. Moreover, the flow rate detector 7 for detecting the flow rate of the air-conditioning water via the air conditioner (1 to N) is provided, and the air-conditioning water whose flow rate is detected by the flow rate detector 7 is used as the air-conditioning heat source. Return.

  Each room in the office is provided with a room temperature detector (temperature detector) 8 for detecting the room temperature, and the temperature detection signal is output to the temperature controller 9. The temperature controller 9 is for setting the air conditioning temperature of the room, and the air conditioning temperature setting signal is output to the pressure setting function calculation unit 12 together with the temperature detection signal from the room temperature detector 8. The temperature controller 9 adjusts the opening degree of the two-way valve 10 attached to the outlet side of each air conditioner by PID control or the like based on the air conditioning temperature setting signal and the temperature detection signal from the room temperature detector 8. To do. An air conditioner operation detector 11 for detecting that the air conditioner is operating is attached to each air conditioner (1 to N) as an accessory. Further, as will be described later, the pressure setting function calculation unit 12 shown in FIG. 1 performs the pressure described later based on the deviation between the air conditioning set temperature set in the temperature controller 9 in each room of the office and the actual room temperature. Calculate the setting function.

FIG. 2 shows various characteristic curves related to the operation control of the air conditioning secondary pump 2 including the pressure setting function calculated by the pressure setting function calculation unit 12.
In FIG. 2, pressure setting functions (1) and (2) are pressure setting functions calculated based on the deviation between the air conditioning set temperature set in the temperature controller 9 of each room of the office and the actual room temperature. The upper limit and lower limit characteristic curves representing the variable range of the air conditioner show the relationship between the pressure and flow rate of the air conditioning water discharged from the air conditioning secondary pump 2. The pressure setting function calculation unit 12 calculates a pressure setting function between the pressure setting functions (1) and (2) at predetermined time intervals, and calculates a pressure setting value based on the detected flow rate of the air-conditioning water at that time. Has a function to calculate. Although the pressure setting function (1) can operate the air conditioning secondary pump 2 with less energy, the pipe 5 and the heat exchanger coil of each air conditioner and the two sides provided on the outlet side of each air conditioner Depending on the flow resistance of the path through which the air-conditioning water passes, such as the valve 10, the flow rate of the air-conditioning water may be insufficient. Conversely, the pressure setting function (2) can supply the air-conditioning water from the air-conditioning secondary pump 2 at a sufficient discharge pressure that does not cause a shortage of flow rate. The discharge pressure becomes excessive, and the energy consumption becomes excessive. Therefore, the pressure setting function calculator 12 checks the lower limit pressure setting function while checking whether the air conditioning water flow is insufficient or not according to the deviation between the air conditioning set temperature of the temperature controller 9 in each room of the office and the actual room temperature. By calculating so as to change the pressure setting function between (1) and the upper limit pressure setting function (2), it is possible to obtain an appropriate air conditioning effect and to save energy.
In FIG. 2, pump characteristic curves ST <b> 1 and ST <b> 2 indicate rotational speed characteristic curves of the air conditioning secondary pump 2 by rotational speed control. In addition, the system resistances (1) and (2) pass through the air conditioning water such as the pipe 5, the heat exchanger coil of each air conditioner, and the two-way valve 10 provided on the outlet side of each air conditioner as described above. The flow resistance of the path is shown, which also shows the required pressure of the air conditioning secondary pump 2 for each flow rate. The system resistance (1) shows a resistance curve when all the air conditioners (1 to N) are operating and the flow rate is changed with all the two-way valves 10 fully open. Moreover, system resistance (2) has shown an example of the resistance curve when only a part of air conditioners (1-N) operate | moves.

As described above, when the pressure control unit 3 controls the air-conditioning secondary pump 2 based on the various characteristic curves described above, if the temperature deviation of the air-conditioning target room during cooling is (actual indoor temperature-air-conditioning temperature set value) A room with a large temperature deviation is undercooled. In order to eliminate this, the first determination reference temperature deviation T1 is set in advance, and if the maximum value of the temperature deviation of each chamber is larger than T1, the pressure setting function calculation unit 12 changes the pressure setting function from the current state. Gradually change from the lower limit pressure setting function (1) to the upper limit pressure setting function (2). As a result, the pressure control unit 3 increases the number of rotations of the air conditioning secondary pump 2 and increases the flow rate of the air conditioning water, thereby eliminating the shortage of the cold water flow rate. Conversely, if the maximum value of the temperature deviation of each chamber is smaller than the preset second determination reference temperature deviation T2 (<T1), it is not determined that the cooling is insufficient, and the pressure setting function calculation unit 12 In order to gradually change the pressure setting function from the current state in the direction from the upper limit pressure setting function (2) to the lower limit pressure setting function (1), the pressure control unit 3 reduces the rotation speed of the air conditioning secondary pump 2 and performs air conditioning. Save energy by reducing the flow rate of water. When the maximum value of the temperature deviation of each chamber is between T1 and T2, the pressure setting function calculation unit 12 does not change the current pressure setting function.
Appropriate air conditioning can be obtained and an energy saving effect can be obtained by performing the same control as in the cooling operation during heating.

  The pressure setting function calculation unit 12 uses a predetermined set of flow maximum values for air-conditioning water as the upper limit pressure setting function (2) and the lower limit pressure setting function (1) that define the calculated pressure setting function and its variable range. And the discharge pressure maximum value, the values when the above flow rate maximum values are assigned to the calculated pressure setting function and the upper limit pressure setting function (2) and lower limit pressure setting function (1) are always set. Calculate and set the function for the maximum discharge pressure.

  In the state where the pressure setting function has reached the upper limit pressure setting function (2) during execution of the air conditioning control, even if the maximum value of the temperature deviation of each chamber exceeds a certain time, it is less than the first judgment reference temperature deviation T1. If not, there is a possibility that an air conditioner malfunction or the like has occurred, and if this control state is continued, energy is not saved. Therefore, in such a case, the air conditioner manager is notified by an alarm or the like, and the control is performed in such a manner that the room temperature deviation of the air conditioner that may be defective is excluded from the calculation by the pressure setting function calculation unit 12 as necessary.

It is a system system diagram in which an air conditioning secondary pump is controlled to obtain an appropriate air conditioning and energy saving effect. It shows various characteristic curves related to operation control of an air conditioning secondary pump including a pressure setting function calculated by a pressure setting function calculation unit.

1 to N air conditioner 2 air conditioning secondary pump 3 pressure control unit 4 inverter 5 piping 6 pressure detector 7 flow rate detector 8 room temperature detector (temperature detector)
9 Temperature controller 10 Two-way valve 11 Air conditioner operation detector 12 Pressure setting function calculator

Claims (2)

When supplying air conditioning water from the air conditioning secondary pump to the air conditioner, the air conditioning secondary pump that rotates at a variable speed to vary the discharge pressure of the air conditioning water, A temperature detector for detecting the temperature, an air conditioning temperature controller for setting the air conditioning temperature of the air conditioning target location, a pressure detector for detecting a discharge pressure of the air conditioning water discharged from the air conditioning secondary pump, and the air conditioning target A control device for an air conditioning secondary pump, comprising pressure control means for controlling a discharge pressure of the air conditioning water discharged from the air conditioning secondary pump according to a deviation between an air conditioning set temperature of the place and an actual temperature. ,
Pressure setting function calculating means for calculating a pressure setting function representing the relationship between the flow rate of the air conditioning water supplied from the air conditioning secondary pump and the discharge pressure is provided, and the pressure setting function calculating means is provided at each of the air conditioning target locations. As the deviation between the set air-conditioning temperature and the actual temperature, calculate (actual temperature-air-conditioning temperature set value) during cooling, and calculate (air-conditioning temperature set value-actual temperature) during heating. The maximum value of the deviation at that time is monitored, and when the maximum value exceeds a predetermined first judgment reference temperature deviation, it is within the range of the predetermined upper limit pressure setting function and the lower limit pressure setting function. When the pressure setting function is changed in the direction of increasing the discharge pressure setting value, and the maximum value falls below the second determination reference temperature deviation lower than the first determination reference temperature deviation, the discharge pressure Control device for an air conditioning secondary pump settings and changes the pressure setting function in the direction to decrease. The control device for an air conditioning secondary pump according to claim 1, wherein the pressure setting function calculation means includes an upper limit pressure setting function that defines the calculated pressure setting function and a variable range thereof, and a lower limit pressure setting function. With respect to a predetermined set of maximum flow rate value and discharge pressure maximum value for air conditioning water, the above maximum flow rate value is set for each of the calculated pressure setting function, the set upper pressure setting function, and the lower limit pressure setting function. A control device for an air-conditioning secondary pump, wherein a function for which a value when substituted is always a discharge pressure maximum value is calculated and set.

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