JP2002286260A - Ventilator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a ventilator that can cope with both air-conditioning load reduction effect in an air conditioner due to outdoor air-conditioning effect, and the low-noise ventilation operation of a ventilation fan. SOLUTION: The operation mode of exhaust and air-supply fans 2 and 3 is set based on the difference between indoor setting temperature Tset and outdoor temperature To. The setting is made according to a temperature band where Tset-To belongs. When the Tset-To belongs to a temperature band of 0 to A deg.C (and 0 deg.C or less), the operation is turned off. In the cases of A to B deg.C, B to C deg.C, C to D deg.C, and D deg.C or more, modes (1), (2), (3), and (3) are set, respectively. Based on each mode, fan speed is determined according to the difference Tr-Tset between the room temperature Tr and indoor setting temperature Tset.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilator utilizing a cooling effect of outside air.

[0002]

2. Description of the Related Art As a prior art, for example, Japanese Patent Laid-Open No. 3-164
No. 637 and Japanese Patent Application Laid-Open No. 7-217956 disclose a ventilation device. First, the "air-conditioning ventilator" described in Japanese Patent Application Laid-Open No. 3-164637 discloses a ventilation system in which the deviation between the room temperature and the room set temperature is minimized when the outside air temperature is lower than the room temperature. It has been shown that the motor of the device is controlled to take in outside air into the room and to utilize the outside air cooling effect. Here, the speed of the variable speed motor connected to the intake fan is controlled by inverter control according to a PID calculation program.

[0003] In addition, the "ventilation control device" described in Japanese Patent Application Laid-Open No. Hei 7-217956 discloses that if the outdoor temperature is closer to the indoor target temperature than the indoor temperature, the amount of air taken into the room from the outdoor is increased. This indicates that the air is positively purified and the indoor temperature gradually approaches the indoor target temperature, so that energy consumption by cooling can be reduced. Here, the motor rotation speed of the intake fan is set as a rotation speed corresponding to the outdoor temperature in a range of 70 to 90% of the full rotation speed.

[0004]

In the conventional ventilating apparatus as described above, in the ventilation control utilizing the outside air cooling effect, appropriate ventilation air volume control according to the outside air temperature zone with respect to the indoor target temperature is not considered. For example, even when the outside air temperature is sufficiently lower than the indoor target temperature and a sufficient outside air cooling effect can be obtained even if the outside air introduction air volume is small, the outside air introduction air volume is set to be large, and the noise of the fan may increase. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a ventilation device capable of achieving both the effect of reducing the cooling load of an air conditioner by the outside air cooling effect and the low noise ventilation operation of a ventilation fan. To provide.

[0006]

A ventilating apparatus according to the present invention includes a ventilating unit for ventilating the inside and the outside of a room and a variable amount of ventilation air, and an outdoor temperature detecting unit for detecting an outdoor temperature. The amount of ventilation air by the ventilation means is varied according to the difference between the set indoor set temperature and the outdoor temperature detected by the outdoor temperature detection means.

When the difference between the indoor set temperature and the outdoor temperature detected by the outdoor temperature detecting means is equal to or lower than a predetermined temperature during the combined operation with the cooling operation by the air conditioner, it is necessary to stop the ventilation operation or maintain the indoor air quality. It is operated with a minimum airflow.

[0008] Further, a CO2 detecting means for detecting the concentration of carbon dioxide in the room is provided, and a ventilation air volume by the ventilation means is varied according to a difference between a predetermined CO2 reference value and a carbon dioxide concentration by the CO2 detecting means. is there.

An outdoor humidity detecting means for detecting the outdoor humidity is provided, and the outdoor temperature by the outdoor temperature detecting means and the outdoor humidity by the outdoor humidity detecting means become a load with respect to a predetermined indoor set temperature and humidity. In the area, the ventilation operation is stopped.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a configuration diagram of a ventilation device according to a first embodiment of the present invention, FIG. 2 is a flowchart illustrating ventilation control of the ventilation device, FIG. 3 is a diagram illustrating determination of an operation mode of a ventilation fan of the ventilation device, and FIG. Is a psychrometric chart showing the ventilation control of this ventilator, and FIG. 5 is a diagram showing the number of rotations of the ventilation fan of this ventilator for each operation mode.

In FIG. 1, 1 is a ventilator body, 2 is an exhaust fan, 3 is an intake fan, and the exhaust fan 2 and the intake fan 3 are connected to a motor 4 on the same shaft, so that indoor exhaust and intake At the same time. The motor 4 has a variable speed, and the amount of ventilation is changed by changing the rotation speed of the motor 4. Reference numeral 5 denotes a control device that controls the number of rotations of the motor 4 based on the indoor temperature detected by the indoor temperature sensor 6 and the outdoor temperature detected by the outdoor temperature sensor 7 to control the amount of ventilation. Reference numerals 8 and 9 denote an exhaust hole and an intake hole, respectively, which penetrate the wall and communicate with the outside.

Next, the operation will be described with reference to the flow chart of FIG. First, in step S1, the control device 5 reads the indoor temperature and the outdoor temperature using the indoor temperature sensor 6 and the outdoor temperature sensor 7. In step S2, the operation modes of the exhaust fan 2 and the intake fan 3 are selected and set based on the difference between the indoor set temperature Tset and the outdoor temperature To set in advance by the user.

In this operation mode, as shown in FIG.
-Set according to which temperature zone To belongs to. For example, if the temperature range is 0 ° C. to A ° C. (and 0 ° C. or lower), the operation is OFF. If the temperature range is A ° C. to B ° C., the mode is OFF.
Mode in the temperature range of B ° C to C ° C, C ° to D ° C
The mode is set if the temperature is within the temperature range of D.degree. Here, A, B, C, and D are arbitrarily settable temperatures. For example, A = 1 ° C., B = 2 ° C., C
= 3 ° C and D = 4 ° C.

The mode indicates, for example, an intake / exhaust operation in which the ventilation air volume is large, medium, and small, respectively, and the details will be described later. Note that, in the ventilation device 1 of the first embodiment,
Since it is assumed that the air conditioner (not shown) is operated in combination with the cooling operation, Tset is used to prevent an increase in the indoor air-conditioning load due to the introduction of outdoor air during the interlocking operation with the cooling operation.
In the temperature range where To is 0 ° C. to A ° C. (and 0 ° C. or less), the operation of the ventilator 1 is turned off.

Further, the humidity at the time of introducing outside air will be described. Even if the outdoor temperature To is lower than the indoor set temperature Tset as shown in the psychrometric diagram of FIG. 4, depending on the humidity of the outdoor air, the outdoor air has a higher enthalpy than the indoor air, so that the external air is introduced. There may be an air conditioning load (α zone in the figure). For this reason, when performing temperature and humidity control taking into account the indoor set humidity φset,
When the difference between Tset and To is equal to or less than a predetermined value, the ventilation operation is stopped, so that an increase in the air conditioning load due to the introduction of outside air can be suppressed. In FIG. 4, a deviation of A.degree. C. from the indoor target temperature is provided for the possibility of introduction of outside air in order to suppress an increase in the air conditioning load due to the introduction of outside air as much as possible.
Set to FF.

In the description so far, the natural ventilation amount that enters from a gap in a house (room) to be ventilated when the operation of the ventilator 1 is stopped is CO2 (carbon dioxide concentration).
The description is based on the premise that the ventilation volume necessary for maintaining the indoor air quality such as the concentration can be maintained. For this reason, when the deviation between the indoor set temperature Tset and the outdoor temperature To is less than or equal to A ° C., the ventilator 1 is turned off. However, in a case where the airtightness of the house is high and the indoor air quality cannot be maintained satisfactorily by natural ventilation alone. , The difference between the indoor set temperature Tset and the outdoor temperature To is A
Even when the temperature is lower than or equal to ° C., by setting the air volume of the intake and exhaust fans to the minimum air volume required for maintaining the indoor air quality, the indoor air quality can be maintained satisfactorily.

Next, step S3 will be described. In step S3, the difference Tr between the room temperature Tr and the indoor set temperature Tset is determined based on the operation mode determined in step S2.
-Determine the fan speed according to Tset. More specifically, as shown in FIG.
The motor 4 is controlled based on r-Tset.

As described above, by performing appropriate ventilation control in accordance with the outdoor air temperature zone with respect to the indoor set temperature, the outdoor air cooling effect can be maximally used, and the air conditioning load of the air conditioner can be reduced. Hereinafter, the theory will be described.

The cooling capacity by ventilation is expressed by the following equation. Qe = Gair · Cp · ΔT Qe: Cooling capacity by ventilation Gair: Ventilation air mass flow Cp: Specific heat of air ΔT: Temperature difference between outdoor air and indoor air

When ΔT is small, by increasing the ventilation airflow Gair, the cooling effect by ventilation can be enhanced, and the cooling input of the air conditioner can be suppressed low. For this reason, when the temperature difference with the outside air is small, it is possible to obtain a greater energy saving effect by increasing the amount of ventilation air.

Also, the outdoor air temperature is low, and especially the room temperature Tr
When the difference Tr−Tset between the temperature and the indoor set temperature Tset is small (the air-conditioning load is small), as shown in FIG.
Since the number of rotations of the fan can be reduced, both noise reduction and energy saving can be achieved. Here, since the fan speed and the fan noise value are in a roughly proportional relationship, FIG.
As shown in (2), according to the difference between the indoor set temperature Tset and the outdoor temperature To, that is, the outdoor temperature To becomes lower and Tset-To
As the value increases, the mode is changed from the mode to the mode and from the mode to the mode, whereby the noise of the exhaust fan 2 and the intake fan 3 can be reduced to a degree substantially proportional to the rotational speed difference between the modes.

Embodiment 2 FIG. FIG. 6 is a configuration diagram of a ventilation device according to Embodiment 2 of the present invention, and FIG. 7 is a flowchart showing ventilation control of the ventilation device. In the figure, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 10 denotes a CO 2 (carbon dioxide) sensor provided on the indoor side of the ventilator 1, and 11 denotes an outdoor humidity sensor provided on the outdoor side, and outputs data to the control device 5.

Next, the operation will be described with reference to the flow chart of FIG. The operations from step S1 to step S3 are the same as those in the first embodiment, and thus description thereof will be omitted. In step S4, the CO2 concentration in the room is measured by the CO2 sensor 10, and a predetermined reference value 0.10 is set.
[vol%]. Therefore, if it is determined that the airflow is higher than the reference value, the ventilation air volume of the exhaust fan 2 and the intake fan 3 is increased in step S5 (step S5).
5). As a result, even when the CO2 concentration increases due to an increase in the number of indoor personnel or the like, it is possible to increase the ventilation volume, lower the CO2 concentration, and maintain a favorable indoor air quality environment. If the reference value has been reached, the process returns to step S1. If the CO2 concentration is equal to or lower than the reference value in step S4, the process returns to step S1.

Although not shown in the flow chart of FIG.
The temperature and humidity of the outside air are detected by the indoor temperature sensor 6 and the outdoor humidity sensor 11, and the position of the outside air on the psychrometric chart of FIG. 4 is determined. In the α zone, the ventilation control is performed so as to turn off the operation of the ventilator 1 so as to avoid the introduction of the outside air, so that the invasion of high enthalpy outside air which increases the air conditioning load can be prevented. Can increase the energy saving effect.

[0025]

Since the present invention is configured as described above, it has the following effects.

The apparatus includes ventilation means for ventilating the inside and the outside of the room and a variable amount of ventilation air, and outdoor temperature detecting means for detecting the outdoor temperature. The preset indoor setting temperature and the outdoor temperature by the outdoor temperature detecting means are provided. The ventilation air volume by the ventilation means is varied according to the difference between the air conditioner and the air conditioner. The energy saving effect can be achieved by the reduction, and when the difference between the indoor set temperature and the outdoor temperature is large, by suppressing the ventilation air volume, the noise of the ventilation means can be reduced.

Further, when the difference between the indoor set temperature and the outdoor temperature detected by the outdoor temperature detecting means is equal to or lower than a predetermined temperature during the combined use operation of the air conditioner and the cooling operation, it is necessary to stop the ventilation operation or maintain the indoor air quality. Since the operation is performed with the minimum ventilation air volume, an increase in the air conditioning load due to the introduction of outside air can be suppressed.

Further, a CO2 detecting means for detecting the concentration of carbon dioxide in the room is provided, and a ventilation air volume by the ventilation means is varied according to a difference between a predetermined CO2 reference value and a carbon dioxide concentration by the CO2 detecting means. Even when the CO2 concentration increases due to an increase in indoor personnel, etc., a good indoor air quality environment can be maintained by increasing the ventilation volume.

An outdoor humidity detecting means for detecting the outdoor humidity is provided, and the outdoor temperature by the outdoor temperature detecting means and the outdoor humidity by the outdoor humidity detecting means become a load with respect to a predetermined indoor set temperature and humidity. Since the ventilation operation is stopped in the region, it is possible to prevent the intrusion of high enthalpy outside air that increases the air conditioning load, and it is possible to enhance the energy saving effect of the cooling operation by the air conditioner.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a ventilation device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing ventilation control of the ventilation device according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating determination of an operation mode of a ventilation fan of the ventilation device according to the first embodiment of the present invention.

FIG. 4 is an air line diagram showing ventilation control of the ventilation device according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a fan rotation speed for each operation mode of a ventilation fan of the ventilation device according to the first embodiment of the present invention.

FIG. 6 is a configuration diagram of a ventilation device according to a second embodiment of the present invention.

FIG. 7 is a flowchart illustrating ventilation control of the ventilation device according to the second embodiment of the present invention.

[Explanation of symbols]

1 ventilator body, 2 exhaust fan, 3 intake fan, 4 motor, 5 control device, 6 indoor temperature sensor, 7 outdoor temperature sensor, 10 CO2 sensor,
11 Outdoor humidity sensor.

Claims (4)

[Claims] 1. An indoor and outdoor ventilation system, comprising: a ventilation means capable of changing a ventilation air flow rate; and an outdoor temperature detection means for detecting an outdoor temperature, wherein a predetermined indoor set temperature and an outdoor temperature detection means are provided. A ventilator, wherein a ventilation air volume by the ventilation means is varied according to a difference from an outdoor temperature. 2. When the difference between the indoor set temperature and the outdoor temperature detected by the outdoor temperature detecting means is equal to or lower than a predetermined temperature during the combined operation of the air conditioner and the cooling operation, it is necessary to stop the ventilation operation or maintain the indoor air quality. The ventilation device according to claim 1, wherein the ventilation device is operated with a minimum ventilation air volume. 3. A CO2 detecting means for detecting a concentration of carbon dioxide in a room, wherein a ventilation air volume by said ventilation means is varied according to a difference between a predetermined CO2 reference value and a carbon dioxide concentration by said CO2 detecting means. 3. The method according to claim 1, wherein
The described ventilation system. 4. An outdoor humidity detecting means for detecting an outdoor humidity, wherein the outdoor temperature by the outdoor temperature detecting means and the outdoor humidity by the outdoor humidity detecting means are loads on a predetermined indoor set temperature and humidity. 4. The ventilation device according to claim 1, wherein the ventilation operation is stopped in the temperature and humidity range.