JP4378974B2 - Air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioner having a function of exhausting indoor air to the outside.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an air conditioner includes a humidifying unit that takes in moisture from outdoor air and transports the moisture into the room (see, for example, Patent Document 1). In this air conditioner, air that is sent into a room by a blower fan of a humidification unit is humidified using a humidification rotor made of zeolite.
[0003]
The air conditioner has a ventilation function of taking outdoor air and supplying it to the humidified room. However, when the indoor air becomes very dirty due to smoking, etc., the ventilation method that sends the outdoor air into the room takes time to push out the dirty indoor air from the gap of the room to the outside of the room. There is a problem that can not be.
[0004]
Therefore, the present applicant has proposed an air conditioner that includes a humidifying unit that takes in moisture from the outdoor air and conveys the moisture into the room, and that can efficiently exhaust the room air to the outside by an exhaust fan (Japanese Patent Application 2001-2001). 41511). This air conditioner includes an indoor unit that air-conditions a room and an outdoor unit that is connected to the outdoor unit via a transfer hose, and exhausts indoor air to the outside via the transfer hose. In addition, this air conditioner is demonstrated in order to make this invention easy to understand, and is not a well-known technique and is not a prior art.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-41511
[Problems to be solved by the invention]
However, in the air conditioner that exhausts indoor air to the outside by the exhaust fan, condensation occurs in the transport hose when the temperature difference between the indoor temperature and the outdoor air temperature is large. That is, as shown in the schematic diagram representing the wet air diagram of FIG. 5, when the outside air temperature is lower than the dew point temperature (state B) during the transfer from the room temperature state A to the outdoor, the dew point temperature (state B). From the state B to the state C, the temperature continues to decrease until the outside air temperature (state C) is reached, and condensation occurs due to the saturated state. For this reason, the generated condensed water pulsates inside the transport hose, so that there is a problem that abnormal noise (buzzing sound) is generated and reaches the room, which is irritating to the resident and impairs comfort. In particular, in the heating season, when indoor air is exhausted to the outside by the exhaust fan, warm air in the room is suddenly cooled at the outlet of the conveyance hose outside the room, so that condensation tends to occur.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide an air conditioner that can effectively prevent the generation of abnormal noise by suppressing the formation of condensation in a transport passage that discharges indoor air to the outside and can improve indoor comfort. There is.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an air conditioner according to claim 1 is an air conditioner including an exhaust fan that exhausts indoor air to the outside through a conveyance passage, and an indoor temperature sensor that detects the indoor temperature; A humidity sensor for detecting indoor relative humidity, an outside temperature sensor for detecting outside air temperature, a room temperature detected by the room temperature sensor, and a room dew point based on the room relative humidity detected by the humidity sensor A dew point temperature calculation unit for calculating a temperature, and when the exhaust fan is in operation, when the outside air temperature detected by the outside air temperature sensor is lower than the dew point temperature of the indoor air calculated by the dew point temperature calculation unit, and a exhaust fan control unit Ru lowering the amount of exhaust of the fan, by the exhaust fan control unit when lowering the amount of exhaust of the exhaust fan, calculated by the dew-point temperature calculating section It is characterized by lowering the predetermined amount exhaust amount of the exhaust fan set according to the temperature difference between the outside air temperature detected by the dew-point temperature and the outside air temperature sensor of the indoor air.
[0009]
According to the air conditioner of the first aspect, the dew point temperature calculation unit calculates the dew point temperature of the room air based on the room temperature detected by the room temperature sensor and the indoor relative humidity detected by the humidity sensor. When the outside air temperature detected by the outside air temperature sensor is lower than the dew point temperature of the indoor air, that is, when there is a possibility that condensation occurs in the transport passage, the exhaust fan control unit the Ru down. Accordingly, it is possible to effectively prevent the generation of noise by suppressing the occurrence of dew condensation in the transfer passage for discharging the room air to the outside of the room, thereby improving the comfort in the room.
[0010]
[0011]
Further , when the temperature difference between the dew point temperature of the room air calculated by the dew point temperature calculation unit and the outside air temperature detected by the outside air temperature sensor is large, the exhaust amount of the exhaust fan is greatly reduced, and the temperature difference is small. In some cases, by reducing the amount of reduction in the exhaust amount of the exhaust fan, it is possible to ventilate the room without reducing the exhaust capacity as much as possible while preventing condensation in the transport passage.
[0012]
An air conditioner according to a second aspect of the present invention is an air conditioner including an exhaust fan that exhausts indoor air to the outside of the room through a transfer passage, and detects an indoor temperature sensor that detects the indoor temperature and an outdoor air temperature. An outside air temperature sensor and a dew point temperature calculating unit for calculating a temperature corresponding to the dew point temperature of the room air by multiplying the room temperature detected by the room temperature sensor by a predetermined coefficient α (0 <α ≦ 1.0). When the exhaust fan is in operation, when the outside air temperature detected by the outside air temperature sensor is lower than the temperature corresponding to the dew point temperature of the room air calculated by the dew point temperature calculation unit, the exhaust amount of the exhaust fan and a exhaust fan control unit Ru lowered, when lowering the amount of exhaust of the exhaust fan by the exhaust fan control unit, corresponds to the dew point temperature of the indoor air that is calculated by the dew-point temperature calculating section The exhaust air amount of the exhaust fan is lowered by a predetermined amount set according to the temperature difference between the temperature and the outside air temperature detected by the outside air temperature sensor .
[0013]
According to the air conditioner of the second aspect, the room temperature detected by the dew point temperature calculation unit is multiplied by a predetermined coefficient α (0 <α ≦ 1.0) by the room temperature detected by the room temperature sensor. When the outside air temperature detected by the outside air temperature sensor is lower than the temperature corresponding to the dew point temperature of the room air, that is, when there is a risk of condensation in the transport passage the exhaust fan control unit, Ru lowers the amount of exhaust of the exhaust fan. Accordingly, it is possible to effectively prevent the generation of noise by suppressing the occurrence of dew condensation in the transfer passage for discharging the room air to the outside of the room, thereby improving the comfort in the room.
When the temperature difference between the temperature corresponding to the dew point temperature of the room air calculated by the dew point temperature calculation unit and the outside air temperature detected by the outside air temperature sensor is large, the exhaust amount of the exhaust fan is greatly reduced, When the temperature difference is small, it is possible to ventilate the room without reducing the exhaust capacity as much as possible while preventing the dew condensation in the transfer passage by reducing the reduction amount of the exhaust amount of the exhaust fan.
[0014]
The air conditioner according to claim 3 is characterized in that, in the air conditioner according to claim 2 , the predetermined coefficient α is set to 1.0.
[0015]
According to the air conditioner of the third aspect, the room temperature detected by the room temperature sensor without using the sensor for detecting the indoor relative humidity is assumed as the dew point temperature of the room air. For example, when the coefficient α is 1.0, the relative humidity in the room is 100%, and condensation may occur when the outside air temperature is lower than the room temperature. In this case, when the outside air temperature is lower than the room temperature, the exhaust fan control unit by than Ru lowers the amount of exhaust of the exhaust fan, it is possible to prevent occurrence of dew condensation in the transfer path by a simple construction and low cost.
[0016]
[0017]
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the air conditioner of this invention is demonstrated in detail by embodiment of illustration.
[0019]
(First embodiment)
FIG. 1 is a block diagram of a main part of an air conditioner according to a first embodiment of the present invention. Reference numeral 1 denotes an outdoor unit installed outdoors, 2 denotes an indoor unit installed indoors, and 3 denotes the indoor unit 2 described above. A remote controller (hereinafter referred to as a remote controller) that transmits a control command to the remote controller. The outdoor unit 1 and the indoor unit 2 are connected via a communication line 4.
[0020]
The outdoor unit 1 includes an outdoor temperature sensor 11 that detects an outdoor temperature, an outdoor control unit 12 that receives a signal representing the outdoor temperature from the outdoor temperature sensor 11, an exhaust fan 13a that is controlled by the outdoor control unit 12, and the like. And a drive unit 13. The outdoor control unit 12 includes a microcomputer, an input / output circuit, and the like, and includes an exhaust fan control unit 12a that controls the exhaust fan 13a. The exhaust fan 13a is a rotational speed control type fan whose rotational speed is controlled by the exhaust fan control unit 12a, and exhausts indoor air from the room to the outside through the transport hose 5 as an example of the transport path.
[0021]
The indoor unit 2 includes a room temperature sensor 21 that detects a room temperature, a humidity sensor 22 that detects a relative humidity in the room, a signal indicating the room temperature from the room temperature sensor 21, and a relative value from the humidity sensor 22. It has an indoor controller 23 that receives a signal representing humidity, a main body switch 24, and an infrared receiver 25 that receives an infrared signal from the remote controller 3. The indoor control unit 23 includes a microcomputer, an input / output circuit, and the like, and calculates the dew point temperature of the room air based on a signal representing the room temperature from the room temperature sensor 21 and a signal representing the relative humidity from the humidity sensor 22. A dew point temperature calculator 23a is provided. Here, the dew point temperature of the room air by the dew point temperature calculation unit 23a is calculated by using a table or a mathematical formula showing the relationship between the room temperature and the relative humidity.
[0022]
FIG. 2 is a flowchart for explaining the processing during exhaust of the outdoor control unit 12 and the indoor control unit 23 of the air conditioner.
[0023]
First, when the process starts, the room temperature detected by the room temperature sensor 21 and the relative humidity detected by the humidity sensor 22 are input to the room controller 23 in step S11.
[0024]
In step S12, the dew point temperature of the room air is calculated by the dew point temperature calculation unit 23a based on the room temperature and the relative humidity.
[0025]
Next, the process proceeds to step S <b> 13, and the outside temperature detected by the outside temperature sensor 11 is input to the outdoor control unit 12.
[0026]
Next, the process proceeds to step S14, and it is determined whether or not the outside air temperature detected by the outside air temperature sensor 11 in the exhaust fan control unit 12a is lower than the dew point temperature of the room air calculated in step S12. If it is determined in step S14 that the outside air temperature is equal to or higher than the indoor dew point temperature, the process proceeds to step S16. If the outside air temperature is determined to be lower than the indoor dew point temperature, the process proceeds to step S17.
[0027]
In step S16, the exhaust fan control unit 12a controls the exhaust fan 13a so as to exhaust the room air with the exhaust amount set to the normal set value, and this process is terminated.
[0028]
On the other hand, in step S17, the exhaust fan control unit 12a controls the exhaust fan 13a so as to exhaust the indoor air by lowering the exhaust amount by a predetermined amount from the normal set value, and this process ends.
[0029]
This exhaust process is repeatedly performed in the exhaust operation mode.
[0030]
In the air conditioner configured as described above, the outside air detected by the outside air temperature sensor 11 is greater than the dew point temperature of the room air calculated based on the room temperature detected by the room temperature sensor 21 and the relative humidity detected by the humidity sensor 22. If condensation is likely to occur in the transport hose 5 when the temperature is low, by reducing the exhaust amount of the exhaust fan 13a, it is possible to suppress the occurrence of condensation in the transport passage for exhausting the indoor air to the outside. Can be effectively prevented. Accordingly, it is possible to improve indoor comfort by suppressing generation of noise that is annoying to residents.
[0031]
(Second Embodiment)
FIG. 3 is a block diagram of a main part of an air conditioner according to a second embodiment of the present invention. The air conditioner of the second embodiment has the same configuration as the air conditioner of the first embodiment except that there is no humidity sensor and the process of the dew point temperature calculation unit is different. The same reference numerals are assigned and the description is omitted.
[0032]
FIG. 4 is a flowchart for explaining processing during exhaust of the outdoor control unit 12 and the indoor control unit 23 of the air conditioner.
[0033]
First, when the process starts, the room temperature detected by the room temperature sensor 21 is input to the room control unit 23 in step S21.
[0034]
In step S22, the dew point temperature calculation unit 30 calculates a temperature corresponding to the dew point temperature of the room air by multiplying the room temperature by a predetermined coefficient α. Here, the coefficient α is assumed to be a value within the range of 0.6 to 1.0. When the coefficient α is 1.0, it means that the indoor relative humidity is 100%, and the coefficient α is set according to the assumed indoor relative humidity.
[0035]
Next, the process proceeds to step S <b> 23, and the outside temperature detected by the outside temperature sensor 11 is input to the outdoor control unit 12.
[0036]
Next, the process proceeds to step S24, where it is determined whether or not the outside air temperature detected by the outside air temperature sensor 11 in the exhaust fan control unit 12a is lower than the temperature corresponding to the dew point temperature of the room air calculated in step S22. If it is determined in step S24 that the outside air temperature is equal to or higher than the temperature corresponding to the indoor dew point temperature, the process proceeds to step S26. On the other hand, if the outside air temperature is determined to be lower than the temperature corresponding to the indoor dew point temperature, the process proceeds to step S27.
[0037]
In step S26, the exhaust fan control unit 12a controls the exhaust fan 13a so that the room air is exhausted with the exhaust amount set to the normal setting value, and this process ends.
[0038]
On the other hand, in step S27, the exhaust fan control unit 12a controls the exhaust fan 13a so as to exhaust the indoor air by lowering the exhaust amount by a predetermined amount from the normal set value, and this process ends.
[0039]
This exhaust process is repeatedly performed in the exhaust operation mode.
[0040]
The air conditioner of the second embodiment has the same effect as that of the first embodiment, and has a simple configuration assuming the dew point temperature of the room air according to the room temperature without using a humidity sensor. An air conditioner that can prevent the occurrence of condensation in the transport hose 5 at low cost can be realized.
[0041]
In the first and second embodiments, the rotational speed of the exhaust fan 13a is controlled to lower the exhaust amount. However, the same effect can be obtained even if the exhaust fan is stopped when the outside air temperature is lower than the dew point temperature. .
[0042]
In the first and second embodiments, the rotational speed of the exhaust fan 13a is controlled to lower the exhaust amount by a predetermined amount from the normal set value. However, the temperature difference between the outside air temperature and the dew point temperature of the room air is reduced. Accordingly, the predetermined amount when the amount of indoor air exhausted by the exhaust fan is lowered from the normal set value may be controlled to be large or small. In this case, it is possible to ventilate the room without reducing the exhaust capacity as much as possible while preventing condensation in the transport hose.
[0043]
In the first and second embodiments, the air conditioner including the exhaust fan that exhausts indoor air to the outside through the conveyance passage has been described. However, humidification that takes in moisture from the outdoor air and conveys moisture into the room. The present invention may be applied to an air conditioner that includes a unit and that can exhaust indoor air to the outside by an exhaust fan. In this case, the transport passage for transporting the humidified air can be used for transporting the room air to the outside of the room, and there is no need to provide a new transport passage for ventilation.
[0044]
【The invention's effect】
As is clear from the above, the air conditioner of the invention of claim 1 is an air conditioner including an exhaust fan that exhausts indoor air to the outside through the transfer passage, and is detected by an indoor temperature sensor. The dew point temperature of the room air is calculated by the dew point temperature calculation unit based on the indoor relative humidity detected by the temperature and humidity sensor, and the outside air temperature detected by the outside air temperature sensor is lower than the calculated dew point temperature of the room air when, at the even Ru lowers the amount of exhaust of the exhaust fan by an exhaust fan control unit.
[0045]
Therefore, according to the air conditioner of the first aspect of the invention, it is possible to effectively prevent the generation of abnormal noise by suppressing the occurrence of condensation in the transport passage for discharging the indoor air to the outside, and the noise that is annoying to the residents. The indoor comfort can be improved by suppressing the occurrence of the above.
[0046]
Further, when the upper Symbol exhaust fan control unit lowers the amount of exhaust of the exhaust fan, depending on the temperature difference between the outside air temperature detected by the dew-point temperature and outside air temperature sensor of the indoor air that is calculated by the dew-point temperature calculating section By reducing the exhaust amount of the exhaust fan by a set predetermined amount, it is possible to ventilate the room without reducing the exhaust capability as much as possible while preventing condensation in the transfer passage.
[0047]
An air conditioner according to a second aspect of the present invention is an air conditioner including an exhaust fan that exhausts indoor air to the outside through a transfer passage, and has a predetermined coefficient for the indoor temperature detected by the indoor temperature sensor. The temperature corresponding to the dew point temperature of the indoor air is calculated by multiplying α (0 <α ≦ 1.0) by the dew point temperature calculating unit, and the outside air temperature sensor than the calculated temperature corresponding to the dew point temperature of the indoor air when outside air temperature is low detected by the exhaust fan control unit by Ri Nodea also Ru lowers the amount of exhaust of the exhaust fan, when lowering the amount of exhaust of the exhaust fan by the exhaust fan control unit, the dew-point temperature calculating section The exhaust air amount of the exhaust fan is lowered by a predetermined amount set according to the temperature difference between the temperature corresponding to the dew point temperature of the indoor air calculated by the above and the outside air temperature detected by the outside air temperature sensor .
[0048]
Therefore, according to the air conditioner of the second aspect of the present invention, it is possible to effectively prevent the generation of noise by suppressing the occurrence of condensation in the transport passage for discharging the indoor air to the outside, and the noise that is annoying to the residents The indoor comfort can be improved by suppressing the occurrence of the above. Further, it is possible to ventilate the room without reducing the exhaust capacity as much as possible while preventing condensation in the transport passage.
[0049]
According to the air conditioner of the invention of claim 3 , in the air conditioner of claim 2 , the predetermined coefficient is 1.0, and the room temperature detected by the room temperature sensor is the dew point temperature of the room air. since assume, when the outside air temperature is lower than the room temperature, the exhaust fan control unit by than Ru lowers the amount of exhaust of the exhaust fan, it is possible to prevent occurrence of dew condensation in the transfer path by a simple construction and low cost.
[0050]
[Brief description of the drawings]
FIG. 1 is a block diagram of a main part of an air conditioner according to a first embodiment of the present invention.
FIG. 2 is a flowchart for explaining the operation of the air conditioner.
FIG. 3 is a block diagram of a main part of an air conditioner according to a second embodiment of the present invention.
FIG. 4 is a flowchart for explaining the operation of the air conditioner.
FIG. 5 is a diagram showing a state change during ventilation in a schematic diagram showing a wet air diagram.
[Explanation of symbols]
1 ... Outdoor unit,
2 ... Indoor unit,
3 ... Remote control,
4 ... communication line,
5 ... Transport hose,
11: outside temperature sensor,
12 ... outdoor control unit,
12a: Exhaust fan control unit,
13 ... Drive unit,
13a ... exhaust fan,
21 ... Indoor temperature sensor,
22 ... Humidity sensor,
23. Indoor control unit,
23a, 30 ... dew point temperature calculation unit,
24 ... body switch,
25: Infrared receiver.

Claims (3)

An air conditioner including an exhaust fan (13a) for exhausting indoor air to the outside through a transfer passage (5),
An indoor temperature sensor (21) for detecting the indoor temperature;
A humidity sensor (22) for detecting the relative humidity in the room;
An outside air temperature sensor (11) for detecting the outside air temperature;
A dew point temperature calculation unit (23a) for calculating the dew point temperature of the room air based on the room temperature detected by the room temperature sensor (21) and the indoor relative humidity detected by the humidity sensor (22);
When the exhaust fan (13a) is in operation, when the outside air temperature detected by the outside air temperature sensor (11) is lower than the dew point temperature of the room air calculated by the dew point temperature calculation unit (23a), the exhaust fan An exhaust fan control unit (12a) for reducing the exhaust amount of (13a),
When the exhaust fan control unit (12a) reduces the exhaust amount of the exhaust fan (13a), it is detected by the dew point temperature of the room air calculated by the dew point temperature calculation unit (23a) and the outside air temperature sensor (11). An air conditioner characterized in that the exhaust amount of the exhaust fan (13a) is lowered by a predetermined amount set according to the temperature difference from the outside air temperature. An air conditioner including an exhaust fan (13a) for exhausting indoor air to the outside through a transfer passage (5),
An indoor temperature sensor (21) for detecting the indoor temperature;
An outside air temperature sensor (11) for detecting the outside air temperature;
A dew point temperature calculating unit (30) that calculates a temperature corresponding to the dew point temperature of the room air by multiplying the room temperature detected by the room temperature sensor (21) by a predetermined coefficient α (0 <α ≦ 1.0). )When,
When the outside air temperature detected by the outside air temperature sensor (11) is lower than the temperature corresponding to the dew point temperature of the room air calculated by the dew point temperature calculating unit (30) during the operation of the exhaust fan (13a). An exhaust fan control unit (12a) for reducing the exhaust amount of the exhaust fan (13a),
When the exhaust fan control unit (12a) reduces the exhaust amount of the exhaust fan (13a), the temperature corresponding to the dew point temperature of the indoor air calculated by the dew point temperature calculation unit (30) and the outside air temperature sensor ( 11. An air conditioner characterized in that the exhaust amount of the exhaust fan (13a) is lowered by a predetermined amount set according to the temperature difference from the outside air temperature detected in (11). In the air conditioner according to claim 2,
An air conditioner characterized in that the predetermined coefficient α is 1.0.

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