JPH0682088A - Control device for air-conditioning device - Google Patents

Abstract

PURPOSE:To provide a control device which can control the air blowing quantity of an air conditioner without providing a separate air volume meter or signal transmitting wire at a blowoff fan, and without generating a large error. CONSTITUTION:The floor structure of a computer room 24 is constituted of a building foundation 20 and floor 22, and a blowoff fan 26 is provided on a floor panel 22a. An air-conditioner 30 is arranged outside of the computer room 24, and an invertor 34 to which a power source 32 is fed is connected to an AC motor 36. The AC motor 36 is connected to a blowing fan 38, and a blowout port 38a of the blowing fan 38 is directed under the floor. A thyrister type power regulator 44 to which a power source 40 is fed is connected to the blowoff fan 26. A temperature detecting 46 is arranged in the computer room 24, and a temperature detector 46 is connected to a temperature controller 48, and the temperature controller 48 is connected to the thyrister type power regulator 44. An effective power transducer 42 which detects the driving power for the blowoff fan 26 is connected to a ratio bias set station 50, and the ratio bias set station 50 is connected to the invertor 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning system for a room having a double floor structure including a building base and floor panels, such as a computer room and an OA room, which is blown out from an air conditioner installed outdoors or indoors. The present invention relates to a device for controlling the amount of air blown by the air conditioner in an air conditioning system that blows the conditioned air under the floor and further blows the conditioned air into the room by a blower fan arranged on the floor panel.

[0002]

2. Description of the Related Art In recent years, in order to streamline office work processing in offices, so-called office automation has been promoted in which office work is performed by a computer or the like. This O
For the purpose of A conversion, a dedicated room for handling large OA equipment such as a computer room is prepared in each building. OA equipment such as a computer consumes a large amount of electric power to generate heat and may malfunction when affected by heat. Therefore, it is necessary to constantly supply conditioned air to the room to keep the room temperature constant. .

Therefore, an air conditioning system as shown in FIG. 2 has been introduced. That is, above the building base 1,
A floor 4 of a computer room 2 is formed at an appropriate distance from the building base 1, and an air conditioner 6 is installed outside the computer room 2. The floor 4 is an appropriate number of floor panels
The floor panel 4a is provided with a blow-out fan 8 at a position where the OA equipment in the room I can be efficiently cooled and the like. The conditioned air blown out from the air conditioner 6 between the building base 1 and the floor 4 is blown into the room I of the computer room 2 by these blow-out fans 8 to ventilate the room I. Further, in the room I, the temperature detector 10 is arranged at a position in consideration of the arrangement of OA equipment and the like, and the temperature of each position in the room I is detected.
Then, the detection result is transmitted to the DDC 12 and the central monitoring device 13, and the DDC 12 and the central monitoring device 13 transmit an air temperature information signal to the inverter 7 of the air conditioner 6 corresponding to the room temperature, and the air flow rate of the air conditioner 6 Is controlled.

Further, the blow-off fans 8 can individually adjust the blow-off amount, and the blow-off amount can be adjusted according to the position of a heat source such as a computer or the preference of an operator.

When the amount of air blown by the air conditioner 6 becomes larger than the total amount of air blown by the blowout fans 8, the underfloor of the floor 4 becomes a positive pressure, and air leaks from the gap between the combined floor panels 4a. There is a risk that the carpet or the like laid on the upper surface of the floor 4 may rise when it is taken out.
In addition, conditioned air leaks to parts where air conditioning is not needed, and energy is wasted. In order to prevent this, it is necessary to bring the floor panels 4a into close contact with each other to improve the airtightness of the building itself, but this results in a large construction cost.

Therefore, it is conceivable to control the air flow rate of the air conditioner 6 so that the underfloor pressure does not become a positive pressure. That is, the amount of air blown from the air conditioner 6 is set to Q _0, and each floor blowing fan 8
_Let q ₁ , q ₂ , ..., Q _n be the blowout amount of

## EQU1 ## If the air flow rate Q ₀ of the air conditioner 6 is controlled so that the relationship of Q ₀ ≤q ₁ + q ₂ +, ..., + q _n is established, the underfloor will not always have a positive pressure.

As means for satisfying the above equation 1, as shown in FIG. 2, the blowout amounts q ₁ , q ₂ ,
, Q _n is measured by the air flow meter 8a, and the total amount q ₁ + q ₂ +, ..., + q _n is calculated by the DDC 12 and the central monitoring device 13,
The blown air amount Q ₀ of the air conditioner 6 is the total amount q ₁ + q ₂ +, ..., + q _n
It is controlled not to exceed.

Further, the state of the operation switch of each blower fan 8, for example, on / off, strong, medium, weak, etc., is monitored by the DDC 12 and the central monitoring device 13, and the blowout amount q ₁ of each blower fan 8 is monitored by the state. q ₂ , ..., Q _n are calculated, and the total amount q ₁ +
There is a means for determining q ₂ +, ..., + q _n and controlling the air flow rate Q ₀ of the air conditioner 6.

Further, as shown in FIG. 3, the underfloor of the floor 4 is divided by an appropriate partition wall 16, and barometers 18a and 18b are arranged at appropriate positions in the partitioned space to measure the atmospheric pressure at each position. There is a way to do it. For example, when the barometer 18a detects a positive pressure, the air flow rate Q ₁ of the air conditioner 6a that blows air to the space where the barometer 18a is located is reduced.

[0010]

However, each of the above-mentioned means for satisfying the above equation 1 has the following problems.

The means for measuring the blow-out amounts q ₁ , q ₂ , ..., Q _n of each blow-out fan 8 shown in FIG. 2 increases the cost of parts because the blow-off fan 8 is provided with the air flow meter 8a. Moreover, wiring is required to transmit the measurement result of each air flow meter 8a to the DDC 12 and the central monitoring device 13, so that the construction cost is high. Furthermore, due to the increase or decrease in the number of blow-out fans 8 due to the change in the indoor layout, it is necessary to change the wiring or rewrite the software for the control procedure used in the central monitoring device 13, which requires a complicated work. .

Also, the means for detecting the state of the operation switch of the blow-out fan 8 requires complicated wiring work and requires rewriting of software when changing the layout, which makes it difficult to reduce the cost. .

On the other hand, in the means for detecting the underfloor pressure shown in FIG. 3, there is a possibility that an error may occur in the control amount due to the positional relationship between the blowout fan 8 and the barometers 18a and 18b. Moreover, when the plurality of air conditioners 6a and 6b are used without providing the partition wall 16, the error is further increased.

Therefore, an object of the present invention is to provide a control device capable of controlling an air conditioner without providing a separate air flow meter or signal transmission line for the blow-out fan and without causing a large error.

[0015]

In order to achieve the above-mentioned object, a control device for an air conditioner according to the present invention has a floor in a room to be conditioned and a building base and a space above the building base, which are appropriately separated from each other. Formed in a double structure consisting of a floor panel, to supply conditioned air from an air conditioner arranged outdoors under the floor of the floor panel,
In an air conditioner that blows the conditioned air into the room by a blow-out fan provided on the floor panel for air conditioning, the active power detector detects the active power during driving of the blow-out fan, and the active power detector detects the active power. The blowing amount of the blowing fan is calculated by the effective power obtained, the total amount of blowing amounts of the blowing fans is obtained, and the blowing amount of the air conditioner does not exceed the total amount of blowing amount. It is characterized by controlling the air flow rate.

[0016]

[Function] A double floor structure is formed by arranging floor panels at appropriate intervals from the building base. And O on the floor panel
The blow-off fan that blows the air under the floor into the room is arranged at a position in consideration of the arrangement of the equipment A, the position of the worker, etc., and the air conditioner is installed outdoors. The conditioned air blown from the air outlet of the air conditioner is blown under the floor, and the air is blown into the room by the blow fan. As a result, the air conditioning of the room can be performed.

Then, the active power detector detects the active power during driving of the blow-out fan. Here, if the sum of the discharge pressure and the suction pressure is constant, the active power during the drive of each blower fan and the blowout amount at that time are in a substantially proportional relationship, so the active power detected by the active power detector is The blowout amount of the blowout fan can be calculated.

Further, the total amount of blown air from each blower fan is obtained, and the amount of blown air of the air conditioner is controlled so that the amount of blown air of the air conditioner does not exceed the total amount of blown air. That is, when the amount of air blown from the air conditioner exceeds the total amount of blown air, the amount of air blown from the air conditioner is reduced to maintain a negative pressure under the floor.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A control device for an air conditioner according to the present invention will be specifically described below based on the illustrated embodiments. In the present embodiment, a case where the control device is used for an air conditioning system in a computer room will be described.

As shown in FIG. 1, a floor 22 is provided which is constructed by combining an appropriate number of floor panels 22a at an appropriate distance from the building base 20, and the floor 22 serves as a floor panel in a computer room. It comprises 24 floors. Therefore,
A space 23 is formed between the building base 20 and the floor 22. The floor panel 22a is provided with a blower fan 26 for blowing the air under the floor into the room at a position where the ambient air around the OA equipment in the room I is efficiently ventilated. The power of the blow-out fans 26 is supplied from the control panel 28 arranged outdoors, or individually for each unit including a proper number of blow-out fans 26.

An air conditioner 30 is installed outside the computer room 24. The air conditioner 30 has a three-phase AC 200 V power source.
Powered by 32. The power source 32 is connected to an inverter 34 inside the air conditioner 30, and the output terminal of the inverter 34 is connected to an AC motor 36. A blower fan 38 is connected to the output shaft of the AC motor 36, and the blower outlet 38a of the blower fan 38 and the blower outlet 30a of the air conditioner 30 are on the floor.
It is directed to the space 23 formed under the floor of 22.

The control panel 28 is supplied with power from a single-phase AC 100 volt power source 40, and the power source 40 is supplied to the control panel 28.
Is connected to a suitable number of thyristor-type power regulators 44 inside. The output terminals of these thyristor type power regulators 44 are connected to the blow-out fan 26 individually or for each unit.

On the other hand, in the computer room 24, an appropriate number of temperature detectors 46 for measuring the temperature of the room I are arranged in consideration of the arrangement of OA equipment and the like. Each is connected to a temperature controller 48 built in the panel 28. Further, the output terminals of these temperature regulators 48 are connected to the input terminals of the thyristor type power regulator 44 to which the blow-out fan 26 that most affects the temperature detector 46 to be connected is connected. .

Further, the connection line connecting the power source 40 and the thyristor type power regulator 44 is provided with an active power transducer.
42 coils are wound. The active power transducer 42 is connected to a ratio bias setting device 50, and the ratio bias setting device 50 is connected to the inverter 34 of the air conditioner 30.

The operation of the control device of this embodiment described above will be described.

The frequency of the three-phase AC 200-volt power source 32 supplied to the air conditioner 30 is converted by the inverter 34, and the AC motor 36 is driven. The blower fan 38 is driven by the output of the AC motor 36, and conditioned air is blown out from the blowout port 38a of the blower fan 38 at a blown amount Q ₀ . Then, this conditioned air is blown to the space 23 under the floor of the floor 22, and is blown into the room I by the blow-out fans 26 to ventilate the room I.

Further, the blow-out fan 26 is arbitrarily set to the on / off state, the blowout amount is strong, and the blower fan 26 is in a medium state by an operation switch (not shown) in the room I. That is,
Depending on the preference of the placement and worker OA equipment room I, each blow fan 26a, 26b, ..., the blow-out amount q _1, q ₂ each 26c, ..., q _n are set properly.

On the other hand, electric power is supplied to the thyristor type power regulator 44 from the single-phase AC 100 volt power source 40. At this time, a magnetic field is generated by the current flowing in the connection line connecting the power supply 40 and the thyristor type power regulator 44,
This magnetic field is detected by the coils of the active power transducer 42. As a result, the active power with respect to the power supplied to the thyristor power regulator 44 is detected by the active power transducer 42. Further, the thyristor type power regulator 44 supplies the power controlled by a signal from a temperature controller 48, which will be described later, among the supplied power to the respective blow-out fans 26a, 26b, ..., 26c.

On the other hand, a temperature detector installed in the room I
The temperature at each position is detected by 46, and these results are transmitted to the temperature controller 48 separately. These temperature controllers 48
Calculates the temperature difference between the indoor temperature and the target temperature, and increases or decreases the value of the output signal according to the magnitude of this temperature difference,
The signals are individually input to the thyristor type power regulator 44.

For example, during cooling, if the temperature detected by the temperature detector 46a is higher than the target temperature, the temperature difference from these temperatures causes the temperature controller 48a to change to the thyristor type power controller 44a.
The value of the signal transmitted to is increased. As a result, the value of the electric power supplied to the thyristor type power regulator 44a is increased, and the blowout amounts q ₁ and q _{2 of} the blowout fans 26a and 26b connected to the thyristor type power regulator 44a are increased. Therefore, the conditioned air blown around the temperature detector 46a increases, the temperature detected by the temperature detector 46a decreases, and the target temperature can be reached.

On the other hand, for example, when the temperature detected by the temperature detector 46b is lower than the target temperature, the signal value transmitted from the temperature controller 48b to the thyristor type power controller 44b is reduced due to the temperature difference between them. . As a result, the value of the power supplied to the thyristor type power regulator 44b is reduced,
A blower fan connected to the thyristor type power regulator 44b
The blowout amount q _{n of} 26c and the like decreases. Therefore, the conditioned air blown around the temperature detector 46b decreases, the temperature detected by the temperature detector 46b rises, and the target temperature can be reached.

By the way, when the room temperature is low and the blow-out amounts q ₁ , q ₂ , ..., Q _n of the blow-out fan 26 decrease, Q ₀ > q ₁ + q ₂ + in relation to the blown air amount Q ₀ of the air conditioner 30. … + Q _n ,
In some cases, the above equation 1 may not be satisfied. In this state, the space 23 under the floor becomes positive pressure, which is not preferable.

At this time, the active power transducer
42 constantly detects the total active power for driving the blow-out fans 26a, 26b, ..., 26c, and the value of the active power detected by the active power transducer 42 is transmitted to the ratio bias setter 50. . Here, if the sum of the discharge pressure and the suction pressure is constant, the blow-out fans 26a, 26b, ..., 26
Since the active power when c is driven and the amount of air blown at that time are almost proportional to each other, if the ratio bias setter 50 is set in advance by investigating the relationship between the active power and the amount of air blown, the blowing fan 26a, By detecting the total value of the driving powers of 26b, ..., 26c, the total amount q ₁ + q ₂ + ... + q _n of the blowout amount is calculated.

The ratio bias setting device 50 constantly sends a signal to the inverter 34, and the inverter 34 converts the frequency of the AC power from the power source 32 according to the conversion ratio determined by the signal. The AC power is supplied to the AC motor 36, and the blower fan 38 is driven by the AC motor 36 to blow air from the air conditioner 30. Therefore, if the relationship between the input signal to the inverter 34 and the air flow rate Q ₀ is obtained in advance, the air conditioner 30 is sent from the input signal to the inverter 34, that is, the value of the output signal of the ratio bias setting device 50. The air volume Q ₀ can be calculated.

Therefore, the ratio bias setter 50 can detect the total amount q ₁ + q ₂ + ... + q _n and the air flow amount Q ₀ of the air conditioner 30, respectively, and the total amount q ₁
The output signal can be transmitted so that + q ₂ + ... + q _n and the blown air amount Q ₀ satisfy the equation (1). The transmitted signal is input to the inverter 34, and the inverter 34
The frequency converted and output by 34 is reduced, and the rotational speed of the AC motor 36 is reduced. This allows air conditioning
The air flow rate Q _{0 of} 30 is reduced, the above equation 1 is satisfied, and the space 23 under the floor is maintained at a negative pressure.

As described above, according to this embodiment, the room I
An appropriate number of temperature detectors 46 are arranged in the thyristor-type power regulator 44 and the results are transmitted to the thyristor-type power regulators 44 via the temperature regulators 48 individually or individually by the thyristor-type power regulators 44. The drive power of the blow-out fan 26 is adjusted. Therefore, according to the temperature change at each position in the room I, the blowing amount from the blowing fan 26 at that position can be appropriately controlled, and fine temperature control can be performed.

In the present embodiment, an example in which the control device for the air conditioner is used as the air conditioner in the computer room has been shown.
It may be used not only in a room but also in a general household. Further, since it can be widely used for air conditioners in general, it can also be used for heaters.

[0038]

As described above, according to the controller of the air conditioner of the present invention, the active power during the driving of the blower fan is detected by the active power detector, and the blowing of each blower fan is performed by the active power. The amount and the total amount of these are calculated. Therefore, it is not necessary to attach an air flow meter to each blow-out fan or wire a signal line, and it is possible to reduce the equipment cost. Further, it is possible to reduce the size of the DDC and the central monitoring device required for monitoring the air flow meter and the like.

Further, when the number of blow-out fans increases or decreases due to changes in the layout of the room, etc., the construction is sufficient by only changing the wiring of the power supply and the setting of the ratio bias setting device 50, so the construction cost should be minimized. You can And
It is not necessary to rewrite the software of the DDC or the central monitoring device, which contributes to cost reduction.

Furthermore, since the air flow rate of the air conditioner is controlled so that the air flow rate of the air conditioner does not exceed the total amount of the air blow rate, the underfloor of the floor panel does not become a positive pressure.
For this reason, it is possible to prevent waste of energy without air leaking out from the gap of the floor panel or wasteful emission of cooled conditioned air to unnecessary portions of the air conditioning. Also, when building a building, it is not necessary to strengthen the building base and floor panels in consideration of the situation where the floor is under positive pressure, which leads to a reduction in construction costs.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing an embodiment of a control device for an air conditioner according to the present invention.

FIG. 2 is an example of a control device for a conventional air conditioner,
It is a schematic block diagram which shows the case where the airflow meter is attached to each blower fan.

FIG. 3 is another example of the control device of the conventional air conditioner,
It is a schematic block diagram which shows the case where a partition wall is formed under the floor and a barometer is arrange | positioned.

[Explanation of symbols]

 20 Building base 22 Floor (floor panel) 24 Computer room 26 Blower fan 28 Control panel 30 Air conditioner 42 Active power transducer (active power detector)

Claims (1)

[Claims] 1. An indoor floor to be air-conditioned is formed in a double structure consisting of a building base and a floor panel provided above the building base so as to be appropriately separated from each other, and is placed outdoors under the floor panel. In an air conditioner that supplies conditioned air from an air conditioner and blows the conditioned air into the room by means of a blower fan arranged on the floor panel, the active power detector detects the active power during driving of the blower fan. Then, the blowing amount of the blowing fan is calculated by the active power detected by the active power detector, the total amount of the blowing amounts of the blowing fans is obtained, and the air blowing amount of the air conditioner exceeds the total amount of the blowing amount. A control device for an air conditioner, which controls the amount of air blown from the air conditioner so as not to occur.