JPS6324229B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device for controlling the amount of outside air taken into an air conditioner.

BACKGROUND ART In an air conditioner installed in a building (hereinafter referred to as an air conditioner), the heat source and the opening of the outside air intake damper are adjusted so that the room temperature is at a comfortable value. In other words, if the indoor air becomes dirty, the damper will be opened to increase the amount of outside air taken in. It goes without saying that the more fresh air the better for office staff. On the other hand, if a large amount of fresh outside air is taken in, a large amount of energy for cooling and heating is required, so from the viewpoint of energy conservation, it is desirable to take in as little outside air as possible.

Therefore, in order to improve this problem, a method has been proposed in which the amount of outside air taken in is controlled so as to maintain the indoor carbon dioxide concentration at a constant value. This is shown in FIG.

In the figure, 1 is an indoor room, 2 is an air conditioner installed in the room 1, 3 is a heat source that sends cold or warm air to the air conditioner 2 through piping 4, 5 is a blower electric motor in the air conditioner 2, and 6 is an electric motor 5. A blower fan 7 is connected to the air conditioner 2 and blows out cool and warm air into the room 1, 8 is a suction duct that also sucks air from the room 1, 9 is an outside air intake, and 10 is an outside air intake 9 and a suction duct. Outside air intake duct connecting duct 8, 1
1 is a damper provided in the outside air intake duct 10 that increases or decreases the air circulation area by opening and closing; 12;
13 is a damper electric motor that drives the damper 11; 13 is a carbon dioxide detector installed in the room 1 to detect carbon dioxide in the room 1 and output an output corresponding to the concentration; 14 is a reference value for the concentration; 15 is a concentration standard This is a regulator that compares the value 14 with the output of the carbon dioxide detector 13 and issues an output corresponding to the deviation.

That is, cool and warm air from the heat source 3 is sent out from the air conditioner 2 by the blower fan 6, blown out into the room 1 through the blow-off duct 7, passed through the room 1, sucked in through the suction duct 8, and returned to the air conditioner 2. . On the other hand, the outside air flows from the outside air intake port 9 to the outside air intake duct 10.
and is taken into the air conditioner 2 through the suction duct 8. The concentration of carbon dioxide in the air 1 is determined by the detector 1
3 and is compared with a concentration reference value 14 set in advance by a regulator 15, and the damper motor 12 is controlled based on the deviation. With this, the opening/closing angle (hereinafter referred to as opening degree) of the damper 11 is controlled, and the amount of outside air taken in is controlled. That is, the amount of outside air intake is automatically controlled so that the concentration of carbon dioxide is always constant.

However, in this device, the carbon dioxide detector 13
is expensive and difficult to maintain,
There is a drawback that this can only be carried out in high-class buildings.

This invention aims to improve the above-mentioned problems, and by detecting the number of people entering and exiting the room, calculating the number of people in the room, and controlling the amount of outside air intake according to the number of people, it is possible to ventilate the room with a simple configuration. It is an object of the present invention to provide an outside air intake amount control device for an air conditioner that can obtain the amount of outside air intake necessary for the purpose of the present invention.

An embodiment of the present invention will be described below with reference to FIG. Note that everything other than what is shown is the same as in FIG. 1.

In the figure, 1a is an entrance leading from indoor 1 to outdoor;
Reference numeral 17 denotes an entry/exit detection device installed at the entrance 1a to detect when a person enters or leaves the room; 18 denotes a floodlight that emits infrared rays 18a that cross the entrance 1a in one direction; 1;
9 outputs "L" when it receives the infrared rays 18a.
20 is a light emitter that also emits infrared rays 20a in the opposite direction to the infrared rays 18a, and 21 outputs "L" when it receives infrared rays 20a, and becomes "H" when blocked. A light receiver, 22 is a room occupancy calculation device that determines whether a person enters or leaves the room from the outputs of the light receivers 19 and 21 and calculates the number of people in the room 1, 23 is an outside air intake amount control device, 24
25 is an outside air amount calculation device that calculates the required amount of outside air from the number of rooms occupied, and 25 is a damper opening degree control that adjusts the damper electric motor 12 according to the output of the outside air amount calculation device 25 to control the opening degree of the damper 11. It is a device.

Next, the operation of this embodiment will be explained.

Now, when a person enters the room 1 from the doorway 1a, the infrared ray 20a is blocked first, then the infrared 1
8a is blocked. Therefore, the output of the light receiver 21 becomes "H". When leaving the room 1 through the doorway 1a, the above is reversed, and after the output of the light receiver 19 becomes "H", the output of the light receiver 21 becomes "H". The occupancy number calculation device 22 includes a light receiver 19,
It is determined whether a person enters or leaves the room based on the order in which the output of 21 becomes "H", the number of people passing by is detected from the number of times this occurs, and the number of people present in the room 1 is calculated from both of these. The outside air amount calculating device 24 calculates the required amount of outside air by multiplying the number of people in the room by a predetermined required amount of outside air per person (for example, 20 m ³ /hour as determined by the Building Management Law). The damper opening degree control device 25 generates an output according to the above-mentioned required amount of outside air, adjusts the damper electric motor 12, and controls the damper 11.
Controls the opening degree, or the amount of outside air intake.

In this way, it is possible to take in an amount of outside air that is appropriate for the number of people in the room.

Note that the room entry/exit detection device 17 shown in FIG. 2 may also be used as a security intrusion detector (not shown). In addition to infrared rays, ultrasonic waves, microwaves, etc. can also be used.

Also, since the projection directions of the infrared rays 18a and 20a are opposite to each other, compared to projection in the same direction,
The S/N (signal/noise) of light shielding detection is improved and malfunctions can be prevented.

FIG. 3 shows another embodiment of the invention.

In the figure, 22 is a room occupancy number calculation device similar to the occupancy number calculation device 22 in FIG. This is a lock detector whose output becomes "H" when the door is locked. The rest is the same as in FIG. 2.

That is, in the case shown in FIG. 2, if the accuracy of the entry/exit detection device 17 is low, there is a possibility of erroneous detection when a large number of people enter and leave the room at the same time.

This embodiment prevents this, and the entrance/exit 1
When room a is locked, the output of the lock detector 27 becomes "H" and the occupancy number calculation device 22 is reset to prevent the accumulation of false detections. If the room 1 is locked, it will be unoccupied, so even if the occupancy number calculating device 22 is reset, no problem will occur.

As described above, this invention attempts to easily determine the amount of ventilation required for a room in accordance with the number of people and to control the amount of outside air intake. There is an entry/exit detector that detects the entry or exit of a room by checking the order in which the energy waves such as light pass in opposite directions, and an entry/exit detector that detects the increase or decrease of people and determines the number of people in the room. It consists of a device that calculates the amount of outside air intake that is required based on the calculation result of the outside air intake amount, and a device that controls the outside air intake damper based on the calculation result of this amount of outside air intake. can be grasped and the control efficiency is good. Moreover, it can also be used for other purposes, such as a security detector usually installed at an entrance/exit, and can be constructed at low cost.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional outside air intake amount control device for an air conditioner, FIG. 2 is a block diagram showing an embodiment of the outside air intake amount control device for an air conditioner according to the present invention, and FIG. 2 are block diagrams showing other embodiments of the present invention, and are equivalent to FIG. 2. DESCRIPTION OF SYMBOLS 1... Indoor, 2... Air conditioner, 11... Damper, 12... Damper electric motor, 17... Room entrance/exit detection device, 22... Occupancy number calculation device, 23... Outside air intake amount control device , 24...Outside air amount calculation device, 2
5... Damper opening degree control device. In the drawings, the same or equivalent parts are indicated by the same reference numerals.

Claims (1)

[Claims] 1. A room entry/exit detection device that is installed at the doorway of a room and detects whether a person enters or leaves the room in an air conditioner that controls the outside air taken into the room; this detection device A number calculation device for calculating the number of people present in the room based on the output of the computer; and an outside air intake amount control device for controlling the amount of outside air taken into the air conditioner based on the output of the calculation device, The device projects and receives energy waves in opposite directions2.
1. An outside air intake amount control device for an air conditioner, comprising a set of detectors arranged in parallel.