JPS61225897A - Control of blowing equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a first blower that pushes outside air into an electrical room in which electrical equipment is installed to cool the electrical equipment, and an electrical equipment that is installed outside the electrical room. The present invention relates to a method of controlling an air blowing facility equipped with a second air blower that exhausts air in the electrical room for cooling.

[Technical background of the invention and its problems] Conventionally, in factories, especially steelworks, etc., the electrical room where electrical equipment such as control panels and switchboards are installed is usually separated from the yard (line). It is. Generally, environmental conditions in yards are poor, and electrical equipment installed in yards is cooled by blowing air from inside the electrical room.

Figure 1 shows a schematic configuration of this kind of conventional blower stage teeth.
Electrical room 1 and yard 2 are separated by a wall. electricity v1
In order to avoid an increase in the temperature inside the electrical room 1 due to the heat generated from the electrical equipment 3 installed in the electrical room 1, a blower ff1ll14 (hereinafter referred to as an electrical room forced fan) that takes in outside air and sends it into the electrical room 1 is installed.

In order to prevent dust and the like from entering the electrical room 1, outside air is filtered by a filter 5. Also, in order to cool the electric equipment to be cooled installed in the yard 2, mainly the electric motor 6, air in the electric v1 is forced into the electric motor 6! ! ! 7 (hereinafter referred to as auxiliary forced air blower) is installed. In FIG. 1, there is one electric room forced air blower 4 and one auxiliary equipment forced air blower 7, but it goes without saying that in reality, several units of each will be installed.

Regarding the rating of the electric room forced air blower 4, the temperature in the electric room 1 is J! 1m and the auxiliary forced air blower 7 etc. to compensate for the scenery discharged from the electric v1, make the inside of the electric room 1 a higher pressure than the outside air, and the air volume to avoid blowing in dust etc., whichever is larger. . Also, auxiliary equipment forced air blower F! The rating of No. 17 is determined by the required air volume at the time of the rated load of the electric motor 6.

Conventionally, variable speed operation of blowers was not common, so the rating of blower 114.7 was determined based on the worst conditions.

In recent years, variable speed operation has become commonplace, and from the perspective of energy conservation, it is possible to reduce seasonal changes in outside temperature and I! Efforts have begun to be made to control the dose according to the load on electrical equipment such as electric motors.

However, the 143m control of the electric room 1 internal temperature ff1l14 and the auxiliary forced air blower 7 needs to satisfy the conditions for determining the rating described above. In this case, the electric room forced air blower 4! a I
t till m depends on the pressure inside the electric room 1, that is, the air volume discharged by the auxiliary forced air blower 4, and the control of the auxiliary forced air fan 7 depends on the temperature inside the electric room 1, that is, the pressure of the electric room forced air blower 7. It depends on the amount of air flowing in. For this reason, control is troublesome, and in some cases, the motors in the three yards of electrical equipment in the electrical room 1 may not be sufficiently cooled, leading to damage to them and increasing the power consumption of the blower.

[Objective of the Invention] The present invention was made in view of the above circumstances, and provides a method for controlling air blowing equipment that can efficiently cool electrical equipment inside and outside the electrical room and can reduce blower power consumption. The purpose is to

[IIN Essentials of the Invention] In order to achieve the above object, the present invention first temporarily sets the temperature in the electrical room, and calculates the forced air IQr of the second blower based on the predicted load obtained from this set temperature. , Also, calculate the push JIIQ2 of the first blower from the outside air temperature outside the electrical room, the set temperature inside the electrical room, and the predicted load, and calculate the above Qs , (Ql +02 )
Set the larger of these as the new necessary wind outlet, and set this J
Calculate the total power consumption of the blower to push in the amount of 1 m, then reset it taking into account the temperature in the electrical room and the predetermined temperature increments, repeat until the above electric 1 m degree becomes the specified value,
If the electric room temperature is not below the specified value, the calculation of the forced air IQx, Q2 and the total power consumption is stopped, and the above-mentioned feed J! Determine the push Jall of the first and second blowers with the minimum value of the total power consumption, and apply the frequencies corresponding to these as set values to the variable voltage variable frequency power supply @ of the drive motor of the blower. This is a method of controlling air blowing equipment.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a schematic configuration of an apparatus for carrying out the method of the present invention, and reference numeral 8 denotes a driving electric motor 9 for the electric room forced air blower 4, which is an induction motor for driving the auxiliary forced air blower 7. These induction motors 8.9 are equipped with a variable voltage variable frequency N source system [(hereinafter referred to as V
(referred to as VVF device) 10.11, each is operated at variable speed. This VVVF device @10.11 controls the speed of the induction motors 8 and 9 by generating a frequency and a voltage according to the frequency based on a frequency setting from the outside. 12 is the JIII system tIII @ plan, and based on data such as predicted load from the host computer 13 and actual values such as outside temperature from the detector, the required air volume for electric push-in and the need for auxiliary equipment push! Calculate the amount of a and the required I! VvVF equipment WI with the operating frequency corresponding to 1m as the set value! lo, 11.

Next, the method for controlling the air blowing equipment according to the present invention will be explained based on the flowchart shown in FIG.

First, the temperature inside the electrical room 1 is temporarily set. Based on this set temperature T1 and the predicted load P1 given by the host computer 13, the auxiliary machine pushing weight Q1 is calculated based on equation (1).

Ql-α(A-Pt)+B (i)α,A
is a constant determined by the load and cooling effect of electrical equipment, B
is a constant determined by the temperature inside the electrical room 1.

Next, from the outside temperature T2 detected by the detector, the temperature setting value T1 in the electrical room 1, and the predicted load P2 given from the upper calculation a13, the electrical room is pushed 1! Calculate IIQ2.

β is a constant.

Here, as mentioned above, it is necessary to maintain the pressure inside the electrical room 1 higher than the outside pressure. That is, it is necessary to satisfy equation (3).

Q2>01+Q3 (3) Therefore, the electric room forced air volume Q2 is Q2゜(Ql +03
) is set as the new required JillQz'.

Next these 7! The power consumption for pushing IIQ1.02' is calculated each time, and the above-mentioned host computer 13 stores this.

D-β・Q1+γ・Q2' (4) β・γ
is a constant determined by the blower characteristics.

Next, the temperature T1 in the electrical room 1 is reset as T1+ΔT (predetermined temperature increments), and the above-mentioned push ff1lQ! , Q2 and total power consumption are repeated until the electric room temperature set value becomes the specified value.

On the other hand, if the temperature of the electrical room 1 is not below the specified value (N
A) When the above-mentioned pushing wind IQt exceeds the fixed value.

After completing the calculation of Q2 and total power consumption, the auxiliary equipment push-in wind IIQ1 and the electric room push-in 11Q2 when the power consumption is the smallest
Let be the setting value of each blower. The above-mentioned style farming system! I device 12 has wind IIQ1. VVVF device with frequency according to Q2! 1
Give 0.11 as the setting value.

In this way, the electric room forced air blower 4 and the auxiliary equipment method J! at
The operating frequency of the VVVF device 10.11 of the drive motor 8.9 that drives each of the drive motors 8.9 and 17 can be determined to minimize power consumption, allowing efficient operation of the electrical equipment 3 and the motor 6, and reducing the power consumption of the transmission mII. can be made smaller.

[Effects of the Invention] According to the present invention, it is possible to provide a control method for air blowing equipment that can efficiently cool electric equipment inside and outside an electric room and minimize the power consumption of the blower.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the general grooves and configuration of the air blowing equipment to which the present invention is applied, Fig. 2 is a diagram showing the schematic configuration of a device for carrying out the method of the present invention, and Fig. 3 is a diagram showing the air blowing equipment according to the present invention. 70-chart for explaining the control method. 1... Electrical room, 2... Yard, 3... Electrical equipment,
4... Electric room forced air blower, 5... Filter, 6...
...Electric motor, 7...Auxiliary equipment push feed WA machine, 8.9...
induction motor, 10. . 11・VVVF device, 12-ffl In &J II
II! , 13... Upper computer. Applicant's representative Patent attorney Takehiko Suzue Figure 1 2r! ! J g13ai!

Claims (1)

[Scope of Claims] A first blower for forcing outside air into the electrical room in order to cool a first electrical equipment installed in the electrical room, and a second blower installed outside the electrical room. A second blower is provided for discharging air from the electrical room in order to cool the electrical equipment, and the electric motors for driving the first and second blowers are each operated by a variable voltage variable frequency power supply device in the blower equipment. First, the temperature inside the electrical room is temporarily set, and the forced air volume Q_1 of the second blower is calculated based on the predicted load obtained from this provisional set temperature, and the outside air temperature outside the electrical room and the set temperature inside the electrical room are calculated. Calculate the forced air volume Q_2 of the first blower from the above and predicted load, set the larger of the above Q_1 and (Q_1+Q_2) as the new required air volume, and calculate the total power consumption D of the blower to push this air volume. Next, the humidity in the electrical room and the predetermined temperature increments are reset and repeated until the electrical room temperature reaches the specified value, and if the electrical room temperature is not below the specified value, the forced air volume Q_1, Q_2 is set again. and the calculation of the total power consumption D, and determine the forced air volume of the first and second blowers that is the minimum value of the total power consumption of the blowers, and set the frequencies corresponding to these as the set values for each of the variable voltages. A method for controlling air blowing equipment that is applied to a variable frequency power supply device.