JPH08152177A - Air conditioning system - Google Patents

Abstract

PURPOSE: To eliminate a centralized control device, and at the same time, corre spond to the change of a layout by providing means which make an indoor fan of a main group operate continuously, and stop an indoor fan of a back-up group, etc., under a condition that a thermostat is off. CONSTITUTION: A plurality of air conditioning devices are respectively installed in the same room, and at the same time, respective control devices are arranged in respective air conditioning devices. In the meantime, some of the air conditioning devices are divided into a main group which becomes a thermostat being on condition wherein when an actual temperature in the room is higher than a set temperature of the control device, a cooling is performed by operating a compressor, and becomes a thermostat being off condition wherein the actual temperature in the room is lower than the set temperature of the control device, the cooling is stopped by stopping the compressor. In the meantime, remaining air conditioning devices are divided into a back-up group which assists a failure or capability reduction of the main group. Then, under the thermostat being off condition, indoor fans of the main group are made to operate continuously, and at the same time, indoor fans of the back-up group are stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner control system.

[0002]

2. Description of the Related Art In the prior art, as disclosed in Japanese Unexamined Patent Publication No. 62-125249, a control device incorporated in each air conditioner is connected to a central control device, and each air conditioner is controlled by the central control device. It was something to do.

[0003]

The computer to be cooled by the air conditioner for cooling the computer must always be cooled to a temperature within a certain range. Therefore, in order to immediately supplement the cooling capacity even if the air conditioner that is operating normally stops due to a failure, etc., the operation is normally stopped for backup, but the operation is stopped when another air conditioner stops. Installation of an air conditioner to start is required. In the conventional technology, all the air conditioners in the air conditioner system, including the backup air conditioner, are connected to the central control device, and when the air conditioner that is operating normally stops, the air conditioner is stopped. The centralized control unit controls the air conditioner for backup by issuing a command to start the operation. However, in the case of such a control method, although it is possible to perform arbitrary control by setting the centralized control device, it is necessary to install the centralized control device and installation work such as wiring of control signal lines is also required. The cost was increased. In addition, when changing the layout of the computer in the room, changing the air conditioner used for backup by adding a computer, etc., the setting of the centralized control device must be changed.

An object of the present invention is to install a plurality of air conditioners in the same room, and a computer including an air conditioner as a backup in case another air conditioner is stopped due to a failure or the like. In the cooling system,
An object of the present invention is to provide an air conditioning system in which a backup air conditioning device can be set without using a centralized control device and an air conditioning device used as a backup can be arbitrarily selected.

[0005]

In order to achieve the above object, according to the present invention, a plurality of air conditioners are installed in the same room, and the temperature in the room is set to a control device built in the air conditioner. If the temperature is higher than the temperature, the controller issues a command to operate the compressor to perform cooling (thermo-on state), and if the room temperature is lower than the temperature set in the controller installed in the air conditioner, the controller compresses. A group (group A) is always used mainly for cooling to issue a command to stop the operation of the machine and stop cooling (thermo-off state).
And a backup group (referred to as group B) for compensating for a decrease in cooling capacity due to a stop or load fluctuation of the air conditioner of group A.
Even if the indoor temperature drops and the compressor is stopped due to the thermo-off state, the indoor fan continues to operate, and in group B, the indoor fan is also stopped in the thermo-off state.

Further, in the air conditioner used in the air conditioner system, the setting of the manual switch provided in the air conditioner main body is changed so as to operate or stop the indoor fan in the thermo-off state due to the temperature decrease in the room.

[0007]

The temperature set value set in the air conditioner which starts operation for backup when the other air conditioner is stopped is higher than the value set in the other air conditioner. From this fact, when all the air conditioners of group A (referred to as device A) are operating without abnormality, the indoor temperature is the air conditioner of group B (device B).
The value set in (1) is not reached, and the device B does not start operation. Here, the operation of one of the devices A is stopped due to a failure, etc.
When the set value of is reached, the device B starts operation. Although the device B is in the state of accepting the normal operation,
Since the indoor temperature has not reached the set value of the device B and neither the compressor nor the blower has stopped operating, power is not required except during backup. On the other hand, when the load is drastically reduced and the indoor temperature becomes equal to or lower than the set value of the device A, the indoor fan continues to operate even when the compressor is stopped in the device A because of the indoor air circulation.

Further, since all the air conditioners are provided with a manual switch capable of setting whether to use as the device A or the device B, it is possible to change the layout of a cooling target (computer etc.) in the room and Device B used as a backup by adding a cooling target, etc.
When it is necessary to change the installation position and set value of the air conditioner, it can be dealt with only by turning on / off the manual switch of each air conditioner and changing the temperature set value set in the control device.

[0009]

【Example】

(Embodiment 1) In this embodiment, a plurality of air conditioners are installed in the same room, and if the temperature in the room is higher than the temperature set in the controller incorporated in the air conditioner, the controller will be the compressor. To perform cooling (thermo-on state), and if the temperature in the room is lower than the temperature set in the control device built into the air conditioner, the control device issues a command to stop the operation of the compressor. A group that performs cooling (thermo-off state) control, which is always used mainly for cooling, (group A), and a group that compensates for a reduction in cooling capacity due to a stop or load change due to a failure of the air conditioner of the group. Divide into backup groups (referred to as group B)
The group A, which operates continuously, has an indoor fan that continues to operate even if the compressor is stopped due to a thermo-off state due to a decrease in indoor temperature, and the group B stops the indoor fan in a thermo-off state. In Fig. 1, a value higher than the temperature set value of the air conditioner of group A (designated as device A) is selected as the temperature set value of the air conditioner of group B (designated as device B), and the control in the flowchart of Fig. 1 is performed. Let the Group B air conditioner do it.

When all the devices A operate normally and the temperature in the room is below the temperature set value of the air conditioner of the device B, both the compressor and the blower of the device B are stopped. Here, when some of the units in the group A stop operation due to a failure or the like and the indoor temperature rises and exceeds the temperature set value of the device B, the device B starts operating both the compressor and the blower. . On the contrary, when the load in the room is significantly reduced and the temperature in the room becomes lower than the temperature set value of the device A, the device A
Will stop the operation of the compressor only and continue the operation of the blower to circulate the air in the room.

With the air conditioning system, a backup system can be constructed without using a centralized control device for integrally controlling the indoor air conditioning device, so that a centralized control device, a control transmission line, etc. are not required, and the system is installed. Since the construction work can be simplified, it is possible to significantly reduce the cost.

(Embodiment 2) In this embodiment, in the air conditioner used in the air conditioner system of Embodiment 1, all the air conditioners operate or stop the indoor fan in a thermo-off state due to a decrease in indoor temperature. The air conditioner body is provided with a manual switch that can be selected arbitrarily. According to the present air conditioning system, for example, as shown in FIG. 2, when the position of the cooling target 1 is changed indoors, it is determined whether each air conditioning device is used as the device A2 or the device B3. It is possible to deal with the position change of the cooling target 1 by setting the manual switch and changing the temperature set value as shown in FIG. 2 before and after the movement of 1. In addition, not only the movement of the cooling target, but also the addition of the cooling target or the former and the latter at the same time,
Depending on the installation status of the air conditioner, it is possible to respond flexibly.

[0013]

According to the present invention, a plurality of air conditioners are installed in the same room, and an air conditioner system for backup including an air conditioner for backup when another air conditioner is stopped. In the above, the backup air conditioner can be controlled without using the centralized control device, and the layout of the cooling target can be easily changed.

[Brief description of drawings]

FIG. 1 is a control flowchart of an air conditioner according to an embodiment of the present invention.

FIG. 2 is a layout change diagram of the air conditioning system according to the second embodiment of the present invention.

[Explanation of symbols]

 1 ... Cooling target, 2, 3 ... Device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akiyoshi Taga 390 Muramatsu, Shimizu City, Shizuoka Prefecture Hitachi Ltd. Air Conditioning Systems Division

Claims (1)

[Claims] 1. A plurality of air conditioners are installed in the same room, and if the temperature in the room is higher than the temperature set in a controller incorporated in the air conditioner, the controller instructs the compressor to operate. Is turned on to cool the room, and if the room temperature is lower than the temperature set in the controller built into the air conditioner, the controller issues a command to stop the compressor operation and the cooling is stopped. The control is mainly divided into a group that always performs cooling, and a backup group that compensates for a decrease in cooling capacity due to a stop or load change due to a failure of the air conditioner of the group, and a group that always operates has an indoor temperature. Is reduced and the compressor is stopped due to the thermo-off state, the indoor fan continues to operate, and the backup group is Air conditioning system, characterized in that also § emission stops.