JPH04190033A - Outer air taking control method - Google Patents

Abstract

PURPOSE:To enable an improvement of indoor environment to be attained with a low cost by a method wherein an amount of dust in an indoor area is detected and if this detected amount is larger than its predetermined value a control over over outer air taking operation based on the detected amount is preferentially performed. CONSTITUTION:A dust sensor 9 detects an amount of dust in an indoor area and outputs a degree-of-opening signal A for use in controlling a degree-of- opening of a surrounding air bypass damper 5 and a degree-of-opening of a discharging bypassing damper 6. Irrespective of available or non-available outer air cooling, if the detected value of an amount of dust is higher than its predetermined value, a full heat exchanger 2 is turned off and then a degree-of-opening of the damper 5 and a degree-of-opening of the damper 6 are controlled by a signal A, resulting in that a discharging of the indoor air is promoted and an amount of dust is decreased. That is, a reduction of an amount of dust is preferentially controlled rather than an indoor air temperature.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an outside air intake control method that detects the amount of dust indoors and controls the intake of outside air into the room based on the detected value of the dust amount. It is something.

[Conventional technology]

In recent years, I A Q (In Door Air Qua
Indoor dust is seen as a problem from the viewpoint of

[Problem to be solved by the invention]

However, conventionally, air conditioning control has not taken dust into consideration, and even if an air cleaner is installed indoors to reduce the amount of dust, there is a problem of high cost.

On the other hand, outside air is brought into the room for outside air cooling, and in this case, the exhaust of indoor air is promoted and the amount of dust is reduced. However, the amount of outside air taken into the room is determined depending on the degree of outside air cooling, and if there is a large amount of dust, much of it will remain.

[Means to solve the problem]

The present invention has been proposed to solve such problems, and the first invention (invention according to claim 1) is to detect the amount of dust indoors, and to detect the amount of dust based on the detected value of the amount of dust. , which controls the intake of outside air into the room.

Further, the second invention (invention according to claim 2) provides that when the detected value of the dust amount is larger than a predetermined value, the outside air intake control based on the detected value of the dust amount is changed to the outside air intake control based on the outside air cooling. This is done with priority over control.

[Effect]

Therefore, according to the present invention, in the first aspect, the intake of outside air into the room is controlled based on the amount of dust in the room, and the exhaust of indoor air is promoted to reduce the amount of dust.

In addition, in the second invention, for example, when the amount of dust indoors exceeds a predetermined value during outside air intake control based on outside air cooling, the outside air intake control is performed with priority based on the dust amount. This makes it possible to exhaust residual dust that cannot be reduced by outside air cooling alone.

〔Example〕

FIG. 2 is an instrumentation diagram showing an embodiment of an air conditioning system to which the outside air intake control method according to the present invention is applied.

In the figure, 1 is an air conditioner, 2 is a total heat exchanger, 3 is a return air fan, 4 is a return air damper, 5 is an outside air bypass damper, and 6
is an exhaust bypass damper, 7 is an outside air damper for the total heat exchanger,
8 is a return air damper for the total heat exchanger, and 9 is an optical dust sensor that detects the amount of dust by reflected and scattered light.

In such an air conditioning system, outside air OA is given to the air conditioner l according to the control status of the outside air bypass damper 5 and the outside air damper 7 for total heat exchanger, and is taken into a room (not shown) via the air supply duct D1. . On the other hand, the indoor air is sucked out by the air fan 3, and a part of it is returned to the air conditioner 1 via the return air damper 4. It reaches the exhaust duct D2 and becomes the exhaust EX.

The dust sensor 9 is arranged in the passage of indoor air to the return air fan 3 (inside the duct). FIG. 3 shows the calculation output of the dust sensor 9, and the opening signal A for controlling the opening degree O0 of the outside air bypass damper 5 and the opening degree OE of the exhaust bypass damper 6 is generated based on the detected value P■ of the dust amount. Output. FIG. 4 is a block diagram showing the calculation process in the dust sensor 9. That is, the dust sensor 9 detects the amount of dust contained in the indoor air reaching the return air fan 3 as the amount of dust in the room, and uses the detected value Pv of this dust amount.
From this, the damper opening degree θ is determined in the PID calculating section 9-1. That is, the PID calculation unit 9-1 sets the damper opening degree to 0° until the detected value PV of the dust amount reaches SP, and sets the damper opening degree θ to increase in proportion to the detected value pv that increases starting from sp. demand. Then, this damper opening degree θ is given to the bypass filter 9-2, and the damper opening degree θ is set to MIN.
(In this embodiment, 10% of the maximum correlation), MIN becomes the opening signal A from the dust sensor 9, and when the damper opening θ becomes larger than MIN, the damper opening θ becomes the dust This becomes the opening signal A from the sensor 9.

FIG. 1 shows the outside air intake control logic in this air conditioning system.

When the opening degree signal A from the dust sensor 9 is larger than MIN, that is, when the detected value pv of the dust amount is larger than the predetermined value PV, the outside air bypass damper 5 is opened regardless of whether outside air cooling is possible or not. degree 0° and the opening degree of the exhaust bypass damper 6 ○.

is controlled by the opening signal A. At this time, the total heat exchanger outside air damper 7 and the total heat exchanger return air damper 8 are controlled to be closed, thereby turning off the total heat exchanger 2.

On the other hand, when the opening degree signal A from the dust sensor 9 is smaller than MIN, that is, the detected value PV of the dust amount is the predetermined value P.
V, when outside air cooling is possible, the opening degree O8 of the outside air bypass damper 5 and the opening degree OE of the exhaust bypass damper 6 are controlled by the opening degree signal B based on the outside air cooling.

Note that when outside air cooling is impossible and the detected value P■ of the dust amount is smaller than the predetermined value PV, the outside air bypass damper 5
The opening degree O8 of the exhaust bypass damper 6 and the opening degree OE of the exhaust bypass damper 6 are as follows.
The opening degree is controlled to 10% of the maximum opening degree by the directly applied opening signal MIN. At this time, the total heat exchanger 2 is turned on, and the transfer of heat to the outside air supplied through the total heat exchanger outside air damper 7 is caused by the exhaust gas flowing out through the total heat exchanger return air damper 8. It will be done.

As explained above, according to the outside air intake control method according to the present embodiment, for example, during outside air intake control using the opening signal B based on outside air cooling, the detected value PV of the dust amount is set to the predetermined value PV,
In this case, the outside air intake control based on the opening signal A from the dust sensor 9 is performed with priority, and the residual dust that cannot be reduced by outside air cooling alone is exhausted, improving the indoor environment.

In addition, in this embodiment, even when outside air cooling is impossible, the detected value PV of the dust amount is the predetermined value PV.

If the above occurs, the total heat exchanger 2 is turned off, and the opening degree of the outside air bypass damper 5 is 06 and the exhaust bypass damper 6 is 0. is controlled by the opening signal A from the dust sensor 9, promoting the discharge of indoor air and reducing the amount of dust. That is, when outside air cooling is not possible, when the detected value PV of the dust amount exceeds the predetermined value PV1, control is performed with more emphasis on reducing the amount of dust than on the indoor temperature.

FIG. 5 shows the outside air intake control logic when the dust sensor 9 is replaced with a dust stand. That is, instead of the dust sensor 9 that outputs an analog calculation output as shown in Figure 3, a dust stand that outputs a digital calculation output (ON10 F F output) as shown in Figure 6 is used. You can also use it as In this example, the configuration is applied in which the total heat exchanger 2 is removed, and in FIG. 5, the outside air damper corresponds to the outside air bypass damper 5, and the exhaust damper corresponds to the exhaust bypass damper 6.

In addition, in the above-described embodiment, the dust sensor 9 is arranged inside the duct, but it may be arranged indoors. Further, in the above-described embodiment, an optical type dust sensor 9 is used, but various other types of dust sensors can be used.

〔Effect of the invention〕

As explained above, according to the outside air intake control method according to the present invention, in the first invention, the outside air intake into the room is controlled based on the amount of dust in the room, and the exhaust of indoor air is promoted to reduce the amount of dust. This improves the indoor environment.

In addition, in the second invention, for example, when the amount of dust in the room exceeds a predetermined value during outside air intake control based on outside air cooling, the outside air intake control based on the dust amount is performed with priority. Residual dust that cannot be reduced by air conditioning alone can be removed, improving the indoor environment.

In other words, according to the present invention, since the amount of dust is reduced by controlling the intake of outside air, it is possible to improve the indoor environment at a lower cost than with the method of installing an air cleaner. .

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the outside air intake control logic in the air conditioning system shown in FIG. 2, and FIG. 2 is an instrumentation diagram showing an embodiment of the air conditioning system to which the outside air intake control method according to the present invention is applied. Figure 3 shows the calculation output of the dust sensor used in this air conditioning system, Figure 4 is a block diagram showing the calculation process in this dust sensor, and Figure 5 shows the case where the dust sensor is replaced with a dust stand. FIG. 6 is a diagram showing the outside air intake control logic, and FIG. 6 is a diagram showing the calculation output of this dust stand. l... Air conditioner, 3... Return air fan, 4... Return air tamper, 5... Outside air bypass damper, 6... Exhaust bypass damper, 9... Dust sensor. Patent applicant Yamatake Honeywell Co., Ltd.

Claims (2)

[Claims] (1) A method for controlling outside air intake, characterized in that the amount of dust in a room is detected, and the intake of outside air into the room is controlled based on the detected value of the amount of dust. (2) In an outside air intake control method that can perform outside air cooling by taking outside air into a room, the amount of dust in the room is detected, and if the detected value of this amount of dust is larger than a predetermined value, the amount of dust is An outside air intake control method, characterized in that outside air intake control based on a detected value is performed with priority over outside air intake control based on outside air cooling.