JPH04257650A - Air conditioner - Google Patents

Abstract

PURPOSE:To increase relatively an air supply quantity which is required to manage air conditioning load for a living room to make it possible to increase an outside air introduction quantity by decreasing a heat transfer capacity of an air heat exchanger in an air conditioner, in response to the increase of a contamination degree of air in the living room. CONSTITUTION:An air contamination sensor 30, which detects a contamination degree of air in an air conditioning division in which an air conditioner 1 performs air conditioning, is provided, and at the same time, an air passage 34 to by-pass an air heat exchanger 3, and a by-pass damper 32 to open or close the passage 34 are provided, and the by-pass damper 32 is opened or closed based on detection signals of the air contamination sensor. By this method, air contamination in a living room is quickly removed, and at the same time, air contamination is prevented from generating, and the inside of the living room can be kept at a suitable temperature.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to an air conditioner, and more particularly, an air conditioner is provided in an air passage that bypasses an air heat exchanger depending on the degree of contamination of the air in the air conditioning compartment where the air conditioner performs air conditioning. This invention relates to an air conditioner that can open and close a bypass damper.

0002

2. Description of the Related Art FIG. 3 is an explanatory diagram showing the configuration of a conventional air conditioner. In the figure, an air conditioner 1 includes an air heat exchanger 3 that exchanges heat between indoor air and a heat medium such as cold/hot water, a blower 4 that supplies air to an air supply duct 11, and a filter 2 that filters the air. It is equipped with There are living rooms 10a and 10b that are air-conditioned adjacent to the air conditioner 1, and air-conditioned cold and hot air (supply air) that comes out of the air conditioner 1.
is supplied to each living room 10a, 10b by the blower 4 through the duct 11, dampers 5a, 5b, and air outlets 8a, 8b, while the air in the living rooms 10a, 10b is taken out via the return air duct 12, and most of the air is While being returned to the air conditioner 1, a portion of the air is discharged outdoors as exhaust air by an exhaust fan 17. The air conditioner 1 is configured to take in outside air through a duct 15 and a damper 16, and to take in return air through a return air duct 12 and a damper 14, respectively.

On the other hand, in each living room, room temperature sensors 7a and 7b are installed to maintain the temperature within the living room within an appropriate range using a means generally called a VAV system (variable air volume system), and damper actuators are activated according to the room temperature. The dampers 6a and 6b are driven to open and close the dampers 5a and 5b to adjust the amount of air supplied into the living room to perform heating and cooling.

[0004] In the conventional apparatus configured as described above, when the air in the living rooms 10a and 10b becomes polluted during operation, for example, the concentration of carbon dioxide and dust increase due to cigarette smoke or the concentration of a large number of people. In such cases, as a countermeasure, the exhaust fan 17 is operated, the damper 14 is closed, and the damper 15 is opened to increase the amount of outside air taken into the air conditioner 1 to supply fresh air to each living room 10a, 10b. I was trying to send in fresh air.

[0005]

[Problem to be Solved by the Invention] However, when the room temperature in each living room is within the appropriate range and the load is small, the opening degree of the dampers 5a and 5b is small to ensure that sufficient fresh outside air is contained. A problem arises in that supply air cannot be pumped in.

[0006] In addition, in order to avoid such a situation, control is also used to maintain the dampers 5a and 5b in a half-open state and prevent them from closing more than a predetermined amount so as to ensure the minimum amount of ventilation to each living room 10a and 10b. In this case, each living room 10a, 10b
The amount of supply air flowing into the air conditioner exceeds the balance with the heat load, and since the supply air always exchanges heat with a heat medium such as cold and hot water in the air exchanger 3 in the air conditioner, the supply air flows in proportion to the increase in air volume. The amount of heat transfer increases. Therefore, there is a problem in that more cold and hot heat than necessary is transferred to each living room 10a, 10b, causing each living room 10a, 10b to become too cold or too warm.

The present invention was devised in view of the above circumstances, and its purpose is to reduce the heat transfer capacity of an air heat exchanger in an air conditioner in response to an increase in the degree of contamination of indoor air. The object of the present invention is to provide an air conditioner that relatively increases the amount of air supply required to cover the air conditioning load of a living room, thereby increasing the amount of outside air introduced.

[0008]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an air heat exchanger that exchanges heat between a heat medium and indoor air, a blower that supplies air to an air supply duct, and a filter that filters the air. In the air conditioner equipped with a filter, an air pollution sensor is provided to detect the degree of contamination of the air in the air conditioning section where the air conditioner performs air conditioning, and the air heat exchanger is installed in the air conditioner. The present invention is characterized in that it includes a bypass air passage and a bypass damper that opens and closes the passage, and opens and closes the bypass damper based on a detection signal from the air pollution sensor.

[0009]

According to the structure of the present invention, if the air in the air conditioning section becomes contaminated during operation of the air conditioner, the air pollution sensor detects this. When the air pollution sensor detects that the air is contaminated beyond a permissible value, the bypass damper is opened to increase the amount of air supplied to the living room (ventilation amount) while balancing the air conditioning load in the living room. This makes it possible to supply air containing a large amount of fresh outside air into the living room, and quickly remove contamination within the living room.

0010

Embodiments Hereinafter, embodiments of the air conditioner according to the present invention will be described with reference to FIGS. 1 and 2.

The air conditioner 1 includes an air heat exchanger 3 for exchanging heat between indoor air and a heat medium such as cold/hot water, a blower 4 for supplying air to an air supply duct 11, and a filter 2 for filtering the air.
It is equipped with. In particular, the present invention provides an air passage 34 that bypasses the air heat exchanger 3, and a bypass damper 32 that opens and closes this air passage 34.

Furthermore, in the present invention, the return air duct 1
2 is provided with an air pollution sensor 30, which is configured to detect the degree of air pollution in each air-conditioned compartment. The air pollution sensor 30 is, for example, a carbon dioxide sensor (C
It consists of an O2 sensor) and a carbon monoxide sensor (CO sensor). In addition, the air pollution sensor 30 is connected to the controller 3
This controller 31 takes in the signal from the air pollution sensor 30, compares it with an allowable value, and when there is a signal input that exceeds the allowable value, drives the damper actuator 33 to actuate the bypass damper. 32
I am trying to control the opening.

[0013] Also, the air conditioner 1 and each living room 10a, 10
The air path connecting b has the following configuration similar to conventional air conditioning equipment. That is, while supply air from the air conditioner 1 is supplied to each living room 10a, 10b via the air supply duct 11, dampers 5a, 5b, and air outlets 8a, 8b,
The air inside a and 10b is taken out through the return air duct 12, part of it is returned to the air conditioner 1, and part of it is sent to the exhaust fan 17.
It is configured so that it is discharged outdoors as exhaust gas.

The air conditioner 1 is configured to take in outside air through a duct 15 and a damper 16, and to take in return air through a return air duct 12 and a damper 14, respectively. In addition, the code|symbol 9 is a partition which partitions each living room 10a, 10b.

Next, the operation of the air conditioner according to the present invention constructed as described above will be explained.

[0016] While the air conditioner 1 is operating, the living room 10a or 1
If the air inside 0b is contaminated by cigarette smoke or a large number of people concentrated, and the carbon dioxide concentration increases, the air pollution sensor 30 detects the degree of pollution when the contaminated air flows through the return air duct 12 as return air. is detected. The detection signal from the air pollution sensor 30 is then input to the controller 31, where the input signal is compared with a predetermined tolerance value. If the input signal exceeds the allowable value, it means that the air in the living room 10a or 10b is contaminated beyond the allowable value, and in this case, the controller 31 opens the bypass damper 32. control is performed so that some air bypasses the air heat exchanger 3 and flows. As a result, in the heat exchanger 3, the relative amount of heat transferred from the heat medium (cold/hot water) to the entire air is reduced.

FIG. 2 is an psychrometric diagram showing the state of the living room and air supply in the embodiment of the air conditioner according to the present invention.

In the figure, the horizontal axis is the dry bulb temperature t, the vertical axis is the absolute temperature x, and the diagonal axis is the enthalpy i. Curve L shows a saturation curve.

Taking the living room 10a as an example, the living room 10a is in the state of point c, and when the bypass damper 32 is normally closed to cover the air conditioning load in the living room, the supply air is in the state of a. Air conditioning load heat quantity Q with enthalpy head difference Δh1
The value divided by W1 = Q/Δh1 ... (1) W1
An air flow rate corresponding to the amount of air is adjusted and supplied by the damper 5a, the air conditioning load is covered, and the room temperature is kept constant.

On the other hand, when the bypass damper 32 is opened due to the detection of contamination, the amount of heat transferred to the supply air decreases, so the supply air becomes the state at point b, and in this case, the air conditioning load heat quantity Q
The amount of air supply W2 to cover this is W2 = Q/Δh2 (2).

[0021] Here, when comparing the magnitudes of W1 and W2, from equations (1) and (2), W2 /W1 =Q/Δh2 /Q/Δh1
=Δh1 /Δh2 >1 (3) That is, W2 >W1.

[0022] Therefore, by opening the bypass damper that bypasses the air heat exchanger 3, it is possible to increase the amount of air supplied into the living room while balancing the air conditioning load in the living room, and to supply fresh outside air. By supplying air containing a large amount to the living rooms 10a and 10b, contamination can be quickly removed.

In this embodiment, the air pollution sensor 3
0 is provided in the return air duct 12, but an air pollution sensor is installed in each living room, and when one or more of the sensors generates a signal exceeding a permissible value, control is performed to open the bypass damper 32. There is no problem as a configuration.

In addition, in this embodiment, the bypass damper 32 has been described as being selectively operated to open and close, but it can also be operated continuously as a proportional control that changes the opening degree of the damper 32 according to the degree of air contamination. No problem.

[0025]

Effects of the Invention As is clear from the above description, according to the present invention, the degree of contamination of the air in an air conditioning compartment is detected by an air pollution sensor, and based on this detection signal, air is bypassed by the air heat exchanger. A bypass damper installed in the passageway can be opened and closed, making it possible to increase the amount of ventilation while balancing the air conditioning load in the living room. Therefore, air pollution in the living room can be quickly removed and air pollution can be prevented, and the problem of the living room being too warm or too cold due to ventilation is avoided, and comfort in the living room can be maintained. It is effective.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the overall configuration of an embodiment of an air conditioner according to the present invention.

FIG. 2 is an explanatory diagram showing an psychrometric diagram of an embodiment of the air conditioner according to the present invention.

FIG. 3 is an explanatory diagram showing the overall configuration of a conventional air conditioner.

[Explanation of symbols]

1 Air conditioner 2 Filter 3 Air heat exchanger 4　Blower 5a, 5b Air supply damper 7a, 7b Room temperature sensor 8a, 8b Air outlet 10a, 10b Living room 11 Air supply duct 12 Return air duct 13a, 13b Return air duct 14 Return air damper 15 Outside air intake duct 16 Outside air intake damper 17 Exhaust fan 30 Air pollution sensor 31 Controller 32 Bypass damper 34 Bypass passage

Claims (2)

[Claims] Claim 1: An air conditioner comprising: an air heat exchanger for exchanging heat between a heat medium and indoor air; a blower for supplying air to an air supply duct; and a filter for filtering the air. An air pollution sensor is provided to detect the degree of contamination of the air in an air conditioning section where air conditioning is performed, and an air passage bypassing the air heat exchanger and a bypass damper opening and closing the passage are provided in the air conditioner. An air conditioner characterized in that the bypass damper is opened and closed based on a detection signal from an air pollution sensor. 2. The air conditioner according to claim 1, wherein the bypass damper is opened when the air pollution sensor detects a degree of air pollution exceeding a permissible value.