JP4852791B2 - Ventilation equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ventilator using a cooling effect by outside air.
[0002]
[Prior art]
As a conventional technique, for example, Japanese Laid-Open Patent Publication No. 3-164737 and Japanese Laid-Open Patent Publication No. 7-217956 disclose ventilators.
First, in the “air-conditioning ventilator” described in Japanese Patent Laid-Open No. 3-164737, ventilation is performed so as to minimize the deviation between the indoor temperature and the indoor set temperature when the outdoor air temperature is lower than the indoor temperature. It is shown that the motor of the apparatus is controlled to take outside air into the room and use the outside air cooling effect.
Here, the speed of the variable speed motor connected with the intake fan is controlled by inverter control according to the PID calculation program.
[0003]
Further, in the “ventilation control device” described in Japanese Patent Application Laid-Open No. 7-217956, if the outdoor temperature is closer to the indoor target temperature than the indoor temperature, the amount of air taken into the room from outside is increased. It is shown that the energy consumed by cooling can be saved because the indoor temperature gradually approaches the indoor target temperature.
Here, the motor rotation speed of the intake fan is set to a range of 70 to 90% of the full rotation speed as the rotation speed corresponding to the outdoor temperature.
[0004]
[Problems to be solved by the invention]
In the conventional ventilator as described above, in the ventilation control using 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, the outside air temperature is higher than the indoor target temperature. However, there is a problem that even when the outside air introduction air volume is small and a sufficient outside air cooling effect is obtained, the outside air introduction air volume is set large and the noise of the fan may increase.
[0005]
The present invention has been made to solve the above-described problems, and provides a ventilator that can achieve both a cooling load reduction effect of an air conditioner by an outside air cooling effect and a low noise ventilation operation of a ventilation fan. It is.
[0006]
[Means for Solving the Problems]
The ventilating apparatus according to the present invention includes a ventilation means for ventilating the room and the outdoors, the ventilation air volume being variable, and an outdoor temperature detection means for detecting the outdoor temperature, and a preset indoor set temperature and outdoor temperature. The ventilation air volume by the ventilation means is varied according to the difference from the outdoor temperature by the detection means.
[0007]
Also, during combined operation with cooling operation by an air conditioner, if the difference between the indoor set temperature and the outdoor temperature by the outdoor temperature detection means is below a predetermined temperature, the ventilation operation is stopped or the minimum required for maintaining indoor air quality It operates with ventilation airflow.
[0008]
Furthermore, a CO2 detection means for detecting the carbon dioxide concentration in the room is provided, and the ventilation air volume by the ventilation means is varied according to the difference between the predetermined CO2 reference value and the carbon dioxide concentration by the CO2 detection means.
[0009]
In addition, an outdoor humidity detecting means for detecting outdoor humidity is provided, and ventilation is performed in a temperature and humidity region in which the outdoor temperature by the outdoor temperature detecting means and the outdoor humidity by the outdoor humidity detecting means are loads with respect to a predetermined indoor set temperature and humidity. The operation is stopped.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a ventilation device showing Embodiment 1 of the present invention, FIG. 2 is a flowchart showing ventilation control of this ventilation device, FIG. 3 is a diagram showing operation mode determination of a ventilation fan of this ventilation device, and FIG. Is an air line diagram showing ventilation control of this ventilator, and FIG. 5 is a diagram showing fan rotation speed for each operation mode of the ventilation fan of this ventilator.
[0011]
In FIG. 1, 1 is a ventilator main 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 axis, and exhaust and intake indoors simultaneously. . The motor 4 has a variable speed, and the ventilation amount is changed by changing the rotation speed of the motor 4. Reference numeral 5 denotes a control device that controls the amount of ventilation by controlling the number of revolutions 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. Reference numerals 8 and 9 denote an exhaust hole and an intake hole, respectively, that penetrate the wall.
[0012]
Next, the operation will be described along the flow of FIG.
First, in step S <b> 1, the control device 5 reads the indoor temperature and the outdoor temperature by 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.
[0013]
This operation mode is set according to which temperature zone Tset-To belongs as shown in FIG. For example, if the temperature range is 0 ° C to A ° C (and below 0 ° C), the operation is OFF. If the temperature range is A ° C to B ° C, mode 1; if the temperature range is B ° C to C ° C, mode ▲ 2) Mode (3) is set in the temperature range from C ° C. to D ° C., and mode (3) is set in the temperature range above D ° C.
Here, A, B, C, and D are temperatures that can be arbitrarily set. For example, A = 1 ° C., B = 2 ° C., C = 3 ° C., and D = 4 ° C.
[0014]
Modes {circle around (1)}, {circle around (2)} and {circle around (3)} indicate intake / exhaust operation with, for example, large, medium and small ventilation airflows, respectively, and will be described in detail later.
In the ventilation device 1 according to the first embodiment, since it is assumed that the air conditioner (not shown) is used in combination with the cooling operation, the indoor air conditioning load due to the introduction of outdoor air during the linked operation with the cooling operation is assumed. In order to prevent an increase in the temperature, the operation of the ventilator 1 is turned off in a temperature range where Tset-To is 0 ° C. to A ° C. (and below 0 ° C.).
[0015]
Furthermore, the humidity at the time of external air introduction is demonstrated.
As shown in the air diagram of FIG. 4, even if the outdoor temperature To is lower than the indoor set temperature Tset, depending on the humidity of the outdoor air, the outdoor air is higher in enthalpy than the indoor air. There may be an air conditioning load (α zone in the figure). For this reason, when temperature / humidity control is performed in consideration of the indoor set humidity φset, the increase in air conditioning load due to the introduction of outside air can be suppressed by stopping the ventilation operation when the difference of Tset−To is less than a predetermined value. it can. In FIG. 4, in order to suppress an increase in air conditioning load due to the introduction of outside air as much as possible, a deviation of A ° C. from the indoor target temperature is provided for whether or not outside air can be introduced, and in the α zone in the figure, the operation of the ventilator 1 is turned off.
[0016]
In the above description, when the ventilation device 1 is stopped, the natural ventilation amount that enters through the space of the house (room) to be ventilated maintains the indoor air quality such as the CO2 (carbon dioxide concentration) concentration. The above explanation assumes that the necessary ventilation volume can be maintained. For this reason, the ventilator 1 is turned off when the deviation between the indoor set temperature Tset and the outdoor temperature To is A ° C. or below. However, in the case where the airtightness of the house is high and natural air ventilation alone cannot maintain the indoor air quality well. Even when the deviation between the indoor set temperature Tset and the outdoor temperature To is A ° C. or less, the indoor air quality can be satisfactorily maintained by setting the air volume of the intake / exhaust fan to the minimum air volume necessary for maintaining the indoor air quality. it can.
[0017]
Next, step S3 will be described. In this step S3, based on the operation mode determined in step S2, the fan rotation speed is determined according to the difference Tr-Tset between the room temperature Tr and the indoor set temperature Tset. Specifically, as shown in FIG. 5, the fan rotation speed is determined based on the operation mode and Tr−Tset, and the motor 4 is controlled.
[0018]
As described above, by performing appropriate ventilation amount control according to the outdoor air temperature range with respect to the indoor set temperature, the outdoor air cooling effect can be utilized to the maximum, and the cooling air conditioning load by the air conditioner can be reduced. The theory will be described below.
[0019]
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 rate Cp: Specific air heat ΔT: Temperature difference between outdoor air and indoor air [0020]
When ΔT is small, it is possible to increase the cooling effect by ventilation by increasing the ventilation air volume Gair, and the cooling input of the air conditioner can be kept 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 ventilation air volume.
[0021]
In addition, when the outdoor air temperature is low, particularly when the difference Tr-Tset between the room temperature Tr and the indoor set temperature Tset is small (the air conditioning load is small), the introduced outdoor air volume is secured after ensuring the energy saving effect as shown in FIG. Since the number of rotations of the fan can be suppressed to a low level, both noise reduction and energy saving can be achieved.
Here, since the fan rotation speed and the fan noise value are approximately proportional to each other, as shown in FIG. 3, the outdoor temperature To decreases according to the difference between the indoor set temperature Tset and the outdoor temperature To, that is, Tset−. By changing from mode (1) to mode (2) and from mode (2) to mode (3) as To increases, the exhaust fan 2 and the fan fan 2 are approximately proportional to the rotational speed difference between the modes. The noise of the intake fan 3 can be reduced.
[0022]
Embodiment 2. FIG.
FIG. 6 is a configuration diagram of a ventilation device showing Embodiment 2 of the present invention, and FIG. 7 is a flowchart showing ventilation control of this ventilation device. In the figure, the same reference numerals are given to the same or corresponding parts as those in the first embodiment, and the description will be omitted. Reference numeral 10 denotes a CO2 (carbon dioxide) sensor provided on the indoor side of the ventilation device 1, and 11 denotes an outdoor humidity sensor provided on the outdoor side, and each outputs data to the control device 5.
[0023]
Next, the operation will be described along the flow of FIG.
Since the operations from step S1 to step S3 are the same as those in the first embodiment, description thereof will be omitted.
In step S4, the CO2 concentration in the room is measured by the CO2 sensor 10 and compared with a predetermined reference value 0.10 [vol%]. Therefore, if it is determined that the value 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). As a result, even when the CO2 concentration increases due to an increase in indoor personnel, etc., the ventilation amount can be increased, the CO2 concentration can be lowered, and a good indoor air quality environment can be maintained. When the reference value is reached, the process returns to step S1.
If the CO2 concentration is not more than the reference value in step S4, the process returns to step S1.
[0024]
Although not shown in the flow of FIG. 7, the indoor temperature sensor 6 and the outdoor humidity sensor 11 detect the temperature and humidity of the outside air, determine where the outside air is on the air diagram of FIG. 4, Intrusion of high enthalpy outside air that increases air conditioning load by controlling ventilation so that the operation of the ventilator 1 is turned off in the α zone so as to avoid introduction of outside air in the α zone that becomes an air conditioning load with respect to indoor set temperature and humidity Therefore, the energy saving effect of the air conditioner cooling operation can be enhanced.
[0025]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0026]
Ventilation means that ventilates indoors and outdoors, and the ventilation air volume can be varied, and an outdoor temperature detection means that detects the outdoor temperature, the difference between the preset indoor set temperature and the outdoor temperature detected by the outdoor temperature detection means Since the ventilation air volume by the ventilation means is varied accordingly, by performing ventilation control according to the outdoor temperature range with respect to the indoor set temperature, energy saving by reducing the air conditioning load when operating in combination with the cooling operation by the air conditioner The effect can be achieved, and when the difference between the indoor set temperature and the outdoor temperature is large, the noise of the ventilation means can be reduced by suppressing the ventilation air volume.
[0027]
Also, during the combined operation with the cooling operation by the air conditioner, if the difference between the indoor set temperature and the outdoor temperature by the outdoor temperature detecting means is below a predetermined temperature, the ventilation operation is stopped or the minimum required for maintaining the indoor air quality Since the operation is performed with the ventilation air volume, an increase in the air conditioning load due to the introduction of outside air can be suppressed.
[0028]
In addition, CO2 detection means for detecting the carbon dioxide concentration in the room is provided, and the ventilation air volume by the ventilation means is varied according to the difference between the CO2 reference value determined in advance and the carbon dioxide concentration by the CO2 detection means. Even when the CO2 concentration increases due to, for example, a good indoor air quality environment can be maintained by increasing the ventilation amount.
[0029]
In addition, an outdoor humidity detecting means for detecting outdoor humidity is provided, and ventilation is performed in a temperature and humidity region in which the outdoor temperature by the outdoor temperature detecting means and the outdoor humidity by the outdoor humidity detecting means are loads with respect to a predetermined indoor set temperature and humidity. Since the operation is stopped, it is possible to prevent the entry of high enthalpy outside air that increases the air conditioning load, and the energy saving effect of the cooling operation by the air conditioner can be enhanced.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a ventilation device showing a first embodiment of the present invention.
FIG. 2 is a flowchart showing ventilation control of the ventilation apparatus showing Embodiment 1 of the present invention.
FIG. 3 is a diagram showing determination of an operation mode of a ventilation fan of the ventilation device showing Embodiment 1 of the present invention.
FIG. 4 is an air diagram showing ventilation control of the ventilation device showing Embodiment 1 of the present invention.
FIG. 5 is a diagram showing the fan rotation speed for each operation mode of the ventilation fan of the ventilation apparatus showing Embodiment 1 of the present invention.
FIG. 6 is a configuration diagram of a ventilation device showing a second embodiment of the present invention.
FIG. 7 is a flowchart showing ventilation control of a ventilation device showing Embodiment 2 of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ventilator body, 2 Exhaust fan, 3 Intake fan, 4 Motor, 5 Control apparatus, 6 Indoor temperature sensor, 7 Outdoor temperature sensor, 10 CO2 sensor, 11 Outdoor humidity sensor

Claims (4)

Ventilation means that can change the ventilation air volume by performing indoor and outdoor ventilation and changing the rotation speed of the ventilation fan,
Outdoor temperature detecting means for detecting the outdoor temperature;
Room temperature detection means for detecting room temperature;
The difference between the preset indoor temperature and the outdoor temperature detected by the outdoor temperature detecting means. When the difference is large, the ventilation air volume is small, and when the difference is small, the ventilation air volume is large. An operating mode for controlling the ventilation means set to
With
The operation mode is selected according to the difference between the indoor set temperature and the outdoor temperature, and the rotation speed of the ventilation fan as the ventilation means is changed according to the operation mode and the difference between the room temperature and the indoor set temperature. ventilator the ventilation power the with Rutotomoni the room is varied difference of the indoor set temperature by reducing the rotational speed of the ventilation fan as reduced to reduce the ventilation power and characterized that you reduce noise by . The minimum ventilation air volume required to stop the ventilation operation or maintain the indoor air quality when the difference between the indoor set temperature and the outdoor temperature detected by the outdoor temperature detection means is less than the specified temperature during combined operation with the cooling operation by the air conditioner The ventilation apparatus according to claim 1, wherein the ventilation apparatus is operated with CO2 detection means for detecting the carbon dioxide concentration in the room,
The ventilation apparatus according to claim 1 or 2, wherein the ventilation air volume by the ventilation means is varied in accordance with a difference between a predetermined CO2 reference value and a carbon dioxide concentration by the CO2 detection means. Provided with outdoor humidity detecting means for detecting outdoor humidity,
The ventilation operation is stopped in a temperature / humidity region in which the outdoor temperature by the outdoor temperature detecting means and the outdoor humidity by the outdoor humidity detecting means are loads with respect to a predetermined indoor set temperature / humidity. 4. The ventilation apparatus according to any one of 3.

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