JP2000358399A - Power reduction system for air-conditioning facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power reduction system for a plurality of air blowers and air exhausting apparatuses disposed in a building, such as a hotel where many individual rooms, etc., are air conditioned by a plurality of independent air conditioners and air blowers and air exhausting apparatuses and in a storehouse, etc. SOLUTION: This power reduction system is for already established air conditioning facility for air conditioning or ventilating hotels, department stores, etc., or already established air-conditioning facilities for keeping necessary moisture and temperature and clean environment for administrating products in a storehouse, etc. Rotation of a motor for a fan pump of a plurality of air conditioners, of a motor for air blowers and air exhausting apparatuses, and of a motor for a cooled and hot water pump is comprehensively controlled by a voltage-type PWM inverter disposed at each motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power reduction system by controlling the rotation of a motor in an air conditioning facility by a voltage-type PWM inverter, and more particularly to a plurality of air conditioners in which a large number of divided rooms and the like are independent. The present invention relates to a power reduction system using a voltage-type PWM inverter in a hotel, department store, or other building that is air-conditioned by a blower / exhaust fan. Furthermore, the present invention relates to a power reduction system by controlling the rotation of electric motors of a plurality of blowers and exhaust fans arranged in a warehouse or the like by a voltage-type PWM inverter.

[0002]

2. Description of the Related Art Reduction of power consumption of an electric motor of an air conditioner by an inverter has been performed for a long time. For example, there are many patent applications other than the one disclosed in Japanese Patent Application Laid-Open No. 9-233879.

Japanese Patent Application Laid-Open No. H10-155297 discloses an inverter frequency calculated by calculating an output voltage of an inverter incorporated in an air conditioner, a power supply voltage of the air conditioner, and power consumption of fan motors of an outdoor unit and an indoor unit. A technique for controlling the control is disclosed.

[0004]

Generally, the air volume of the air conditioning fan and the flow rate of the circulation pump are controlled by dampers and valves, but are not suitable for power reduction.

As described above, in reducing the power consumption of a single air conditioner, it is well known to control the rotation of a motor of a circulation pump by a built-in inverter. However, in hotels with a large number of guest rooms, it is necessary to air-condition not only the individual guest rooms but also the lobby, corridors, and kitchens, etc. Is not enough as an energy saving measure.

The present invention has been made in view of the above, and has as its object to clarify a power reduction system in a hotel or other building in which a large number of divided rooms and the like are air-conditioned by a plurality of independent air conditioners and air blowers and exhaust fans. As an issue.

Still another object of the present invention is to clarify a power reduction system by controlling the rotation of a plurality of electric motors of blowers and exhaust fans arranged in a warehouse or the like by a voltage-type PWM inverter.

[0008]

The power reduction system according to the present invention has the following configuration. 1. This is a power reduction system for an existing air-conditioning facility that performs cooling, heating, and ventilation at hotels, department stores, etc., including a fan / pump motor for multiple air conditioners, a blower / discharger motor, and a hot / cold water pump. A power reduction system in an air-conditioning facility, wherein rotations of electric motors are uniformly controlled by voltage-type PWM inverters arranged in the respective electric motors.

[0009] 2. A power reduction system in an existing air-conditioning facility for cooling, heating and ventilating a hotel, department store, etc., in which base load capacity data input in advance by a central processing circuit of a CPU and an electric motor of an air-conditioner fan / pump. The feedback data that has detected the load condition of the air conditioner is calculated, a main frequency command and a slave frequency command are issued, and the output of the host inverter arranged in the electric motor of the fan / pump of the air conditioner is controlled according to the main frequency command. In accordance with the information calculated by the slave frequency command and the load information of the electric motors of the blower, the exhaust fan, and the chilled / hot water pump, the lower inverters disposed in the respective exhaust motors, the blower, and the chilled / hot water pump electric motors. A power reduction system in an air conditioning facility, wherein output is controlled.

[0010] 3. This is a power reduction system for existing air-conditioning facilities that keeps the humidity, temperature, and clean indoor environment necessary for article management in warehouses, etc., and includes a plurality of exhaust fans or blower motors, blowers or exhaust fans. Electric motor,
A power reduction system characterized in that the rotation is uniformly controlled by a voltage-type PWM inverter arranged in each motor.

4. A power reduction system in an existing air-conditioning facility that keeps the humidity, temperature, and clean indoor environment necessary for article management in warehouses and the like, and the base load capacity data input in advance by the central processing circuit of the CPU, The feedback data detecting the load condition of the electric motor of the blower or the blower is calculated, the main frequency command and the slave frequency command are issued, and the upper inverter arranged in the electric motor of the blower or the blower according to the main frequency command. Output is controlled, and the output of the lower inverter arranged in the blower or exhaust fan motor is controlled according to information calculated by the slave frequency command and the load information of the blower or exhaust fan motor. And power reduction system.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The equipment to be controlled in the present invention is as follows.

[0013] Electric motor of an air conditioner (referred to as an external air conditioner, an air handling unit, a fan coil unit, etc.) Electric motor of an air blower / blower (only equipment that ventilates the same area as the above air conditioner) Electric motors for cold / hot water primary / cold / hot water secondary pumps (only for devices that supply cold / hot water to the above air conditioners) Exhaust air / blower motors (only for devices in non-air-conditioned areas such as warehouses, parking lots, and kitchens) Examples of the inverter used in the present invention include a voltage-type PWM inverter (for example, manufactured by Yaskawa Electric Corporation). The reasons for using the voltage-type PWM are that the output voltage waveform is stable, harmful low-order high frequencies can be removed on the power supply side, and functions such as voltage calculation control and vector control can be easily mounted. No.

For details of the voltage-type PWM inverter, see "Inverter Drive Technology 2nd Edition" edited by Yaskawa Electric.
Can be referred to.

The embodiment shown in FIGS. 1 and 2 will be described. This embodiment is an electric motor of an air conditioner that does not introduce outside air,
It controls the electric motor of the exhaust fan, the electric motor of the blower, and the electric motor of the cold / hot water pump in a unified manner.

The voltage-type PWM inverter arranged in the motor of the air conditioner which does not introduce outside air is positioned as a high-order inverter, and the voltage-type PWM inverter is arranged in each of the exhaust motor, the blower motor, and the chilled / hot water pump motor. The PWM inverter is positioned as a lower inverter.

Base load capacity data (information based on the load capacity of each electric motor) is input to the CPU of the control device in advance, and information obtained by detecting the load of a higher-order inverter arranged in the electric motor of the air conditioner is transmitted to the CPU. And the calculation is performed together with the base load capacity data.
The output frequency of the host inverter arranged in the electric motor of the air conditioner is controlled by the main frequency command issued from the CPU. Further, the CPU calculates a base frequency command based on the base load capacity data and the fed-back load information of the higher-order inverter arranged in the electric motor of the air conditioner, and issues a sub-frequency command. The output frequency of the lower inverter disposed in each of the exhaust fan, the blower, and the cold / hot water pump is controlled according to the information calculated based on the load information of each electric motor of the cold / hot water pump.

The embodiment shown in FIG. 3 will be described. This embodiment uses an outside air introduction type air conditioner and is substantially the same as the embodiment shown in FIG. 1 except that a blower is not used.

The embodiment shown in FIG. 4 will be described. This embodiment is shown in FIG. 1 except that the device controlled by the main frequency command is a blower (or blower) motor and the device controlled by the slave frequency command is a blower (or blower) motor. Is substantially the same as the embodiment described above. This embodiment is suitable for controlling electric motors of a plurality of exhaust fans / blowers arranged in an area that is not cooled or heated, such as a warehouse, a parking lot, and a kitchen.

For more efficient power reduction by the power reduction system according to the present invention, it is preferable to add a soft start function to each motor. The inverter changes the output frequency and voltage by a switching circuit. By incorporating a timer in the inverter, the frequency and voltage can be gradually increased (decreased) to the target from the time the power is turned on. Power loss at the time of stoppage, mechanical loss such as shock and friction can be reduced. Further, with this configuration, the life of the drive transmission unit such as a bearing and a belt as well as the motor body is prolonged.

[0021]

EXAMPLE Assuming that the power reduction system according to the present invention is applied to a hotel, an experiment for controlling the control target devices shown in Table 1 was conducted, and the reduced power was estimated. Estimated annual savings are $ 4,502,929, and $ 37 per month
It turned out to be 5,244.

[0022]

[Table 1]

(Note 1) In order to convert the reduction amount into an electricity rate, a summer rate (July to September) requires an electricity unit price of $ 16.15.
In other seasons (October-June)
Multiply by 5.

[0024]

According to the present invention, the reduction rate is 40.5 to 4
6.5%, and sufficient power reduction can be performed.
The task mentioned at the outset is solved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one embodiment of a power reduction system according to the present invention.

FIG. 2 is a block diagram showing a control system of the power reduction system according to the present invention.

FIG. 3 is a schematic diagram showing another embodiment of the power reduction system according to the present invention.

FIG. 4 is a schematic diagram showing another embodiment of the power reduction system according to the present invention.

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Claims (4)

[Claims] 1. A power reduction system for an existing air conditioning facility for cooling, heating and ventilating a hotel, department store, etc., wherein a plurality of air conditioner fan / pump motors, blower / discharger motors are provided. A power reduction system in an air-conditioning facility, wherein the electric motors of the cold and hot water pumps are uniformly controlled by a voltage-type PWM inverter arranged in each electric motor. 2. A power reduction system in an existing air-conditioning facility for cooling, heating and ventilating a hotel, department store, etc., comprising: Feedback data detecting the load condition of the motor of the fan / pump is calculated, and a main frequency command and a sub-frequency command are issued,
According to the main frequency command, the output of the upper inverter arranged in the motor of the fan / pump of the air conditioner is controlled,
According to the information calculated by the slave frequency command and the load motor / blower / cooler / hot-water pump motors and their respective load information, the outputs of the lower inverters respectively arranged in the blower / blower / cooler / hot-water pump motors are output. A power reduction system in an air-conditioning facility, which is controlled. 3. A power reduction system in an existing air-conditioning facility for maintaining humidity, temperature, and a clean indoor environment necessary for article management in a warehouse or the like, wherein a plurality of exhaust motors or blower motors are arranged. A power reduction system characterized in that a motor of a blower or an exhaust fan is uniformly controlled by a voltage-type PWM inverter arranged in each motor. 4. A power reduction system in an existing air conditioning facility for maintaining humidity and temperature required for article management in a warehouse or the like and a clean indoor environment, wherein a central processing circuit of a CPU
Base load capacity data that has been input in advance and feedback data that detects the load status of the blower or the electric motor of the blower are calculated, and a main frequency command and a slave frequency command are issued. Or, the output of the higher-order inverter arranged in the electric motor of the blower is controlled, and according to the information calculated by the slave frequency command and the load information of the electric motor of the air blower or the air blower, the output is arranged in the electric motor of the air blower or the air blower. A power reduction system wherein the output of a lower inverter is controlled.