JPH11190549A - Air cleaning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air cleaning device to keep indoor air in optimum quality such that a consumption power of a total system is minimized, in a space wherein an air-conditioner is arranged. SOLUTION: This air cleaning device comprises a means to operate a ventilation function part 2 and stop an air cleaning part 1 when an airflow necessary to removal of CO2 is higher than an airflow computed by a capacity computing part 5 and necessary to removal of dust; and a means operated such that an airflow necessary to removal of CO2 is processed by a ventilation function part 2 when an airflow necessary to removal of CO2 is lower than an airflow necessary to removal of dust computed by the capacity computing part 5, and a remaining airflow is processed through selection and operation of the air cleaning part 1 and the ventilation function part 2 such that a consumption power of a whole is decreased, in consideration of addition of a power consumed by an air-conditioning load depending upon a temperature difference between the inside and the outside detected by a room temperature sensor 6 and an outside air temperature sensor 7 during operation of the ventilation function part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for optimally maintaining indoor air quality with minimum energy in a space in which an air conditioner, an air purifier and a ventilation device are installed.

[0002]

2. Description of the Related Art Conventionally, as this kind of air purifying apparatus,
For example, there is one disclosed in JP-A-4-108509. The air cleaning device disclosed in Japanese Patent Application Laid-Open No. 4-108509 is provided with a gas sensor and a dust sensor, and has a ventilation function and an air cleaning function, but minimizes heat energy loss during heating and cooling. Therefore, the air purifying function is operated preferentially, and when the gas that cannot be removed by the air purifying function reaches a certain concentration, the ventilation function is operated to reduce the operation time of the air purifying function itself, and the air purifying function It is intended to reduce the amount of gas that cannot be removed by heating and to reduce thermal energy loss.

[0003]

Since the conventional air purifying apparatus is configured as described above, in order to reduce heat energy loss during heating and cooling, the air purifying function is given priority over the ventilation function. Although it operates, the air purifier requires a dust removal unit in addition to the air blower unit, so it consumes more power than the ventilator for the same processing air volume. Therefore, there is a problem that the operation is not always performed with the minimum energy because the removal of gas and dust saves energy.

Further, for example, CO ₂ emitted from the human body
Since contaminants such as gas cannot be removed by the current air cleaning function, the ventilation function is indispensable and is always operated, and there has been a problem that the concept of giving priority to the air cleaning function cannot be established in the first place.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to keep indoor air quality clean with minimum energy, and to reduce maintenance costs due to a reduction in the operation time of an air purifier. It is an object of the present invention to provide an air purifying apparatus that can obtain the same effect even if the dust sensor is omitted.

[0006]

An air purifying apparatus according to the present invention comprises: an air purifying section having a function of removing dust in air; a ventilation function section for exchanging indoor air with outdoor air;
Dust concentration detecting means for detecting dust concentration, pollutant concentration detecting means for detecting contaminant concentration in air which cannot be removed in the air purifying section, and based on detection results of the dust concentration detecting means and the pollutant concentration detecting means. A capacity calculation unit for calculating and controlling the operation capacity of the air purifying unit and the ventilation function unit for setting the dust concentration and the pollutant concentration below the respective reference values, and a room temperature sensor for detecting the indoor temperature, An outdoor temperature sensor for detecting the outdoor temperature, and a means for operating the ventilation function unit and stopping the air cleaning unit when the air volume required for removing pollutants is larger than the air volume required for dust removal calculated by the capacity calculation unit. If the air volume required for pollutant removal is smaller than the air volume required for dust removal calculated by the capacity calculation unit, the air volume required for pollutant removal is processed by the ventilation function unit, and the residual air volume is calculated when the ventilation function unit is operating. Considering that the power consumption by the air conditioning load depending on the inside and outside temperature difference detected by the temperature sensor and the outside air temperature sensor is added, the air cleaning unit and the ventilation function unit are configured so that the total power consumption is reduced. Means for selecting, operating and processing.

Further, the pollutant concentration detecting means is constituted by a CO ₂ sensor, and the dust concentration detecting means is controlled by a CO ₂ sensor.
This is constituted by a dust concentration inference unit for inferring the dust concentration from the O ₂ concentration.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a system schematic diagram showing Embodiment 1 of the present invention. In the figure, reference numeral 1 denotes an air purifying unit for removing contaminants such as dusts;
Is a ventilation function part that exchanges room air with outside air.
A CO ₂ sensor as an example of a pollutant concentration detecting means for detecting the O ₂ concentration, a dust sensor 4 as an example of a dust concentration detecting means for detecting the dust concentration in a room, and a reference numeral 5 as an air purifying section 1 and a ventilation function section 2 And 6 is a room temperature sensor for detecting room temperature, and 7 is an outside air temperature sensor for detecting outside air temperature.

The control concept of the first embodiment will be described with reference to FIG. Pollutants generated indoors include substances that can be removed by air purifiers, such as dust, and CO ₂ contained in human breath.
There are substances that cannot be removed by air purifiers and must be exhausted by ventilators.

[0010] air volume are more necessary CO ₂ removed from the air volume required for dust removal in a state of, for example, conditions 1 but, CO ₂
Since air cannot be removed by an air purifier, it is necessary to treat all of the required amount with a ventilator.

Next, in a state where the air volume required for dust removal is larger than the air volume required for CO ₂ removal as in Situation 2, the basic air volume (= required air volume required for CO ₂ ) needs to be processed by a ventilation device. However, since the remaining residual air volume is an air volume corresponding to dust, it can be processed by an air cleaning device or a ventilation device.

When the residual air volume is processed by the ventilation device,
Extra air-conditioning load is generated by taking in outside air,
This air conditioning load depends on the inside / outside temperature difference. Therefore, the total power consumption when the residual air volume is processed by the ventilation device and when the residual air volume is processed by the air purification device changes depending on the inside / outside temperature difference.
The power consumption in FIG. 2 shows the estimated value of the inside / outside temperature difference and the power consumption depending on the difference in the apparatus for processing the residual air volume. The power consumption here is the sum of the power consumption of the ventilation device, the power consumption of the air purification device, and the increase in the power consumption of the air conditioner when the generated ventilation load is processed by the air conditioner.

For example, when the temperature difference between the inside and outside is small, the ventilator has an advantage of 20 W when the residual air volume is processed by the ventilator, and 57 W when the residual air volume is processed by the air purifier. On the other hand, when the temperature difference between inside and outside is large,
0 W, 76 W when treated with an air purifier, the air purifier is more advantageous.

The control flow of the first embodiment will be described with reference to FIG. This is a flowchart of the contents of control performed by the capacity calculation unit 5. In step S1, a reference concentration of a pollutant is set (CO ₂ concentration 1000 [ppm], dust concentration 0.
15 [g / m ³ ]. Next, in step S2, set values of each device system are set. Here, the power consumption for the unit processing air volume of the ventilation device and the air cleaning device, the air conditioning load coefficient for the unit inside and outside temperature difference of the target room, and the coefficient of performance of the air conditioner are set. Note that these two steps are initial settings,
This is performed only once after the operation starts.

In step S3, the dust concentration is detected by the dust sensor 4, and in step S4, the required processing air volume Qd for making the dust concentration equal to or less than the reference concentration set in step S1 is calculated. Detects the CO ₂ concentration in step S5, CO ₂ sensor 3, it calculates the necessary processing air amount Qc to the following reference density of CO ₂ set in same step S1 At step S6. In step S7, the magnitudes of the calculated Qd and Qc are compared.

If it is determined in step S7 that Qc is larger (corresponding to the situation 1 in FIG. 2), all ventilation should be performed by the ventilation device. In step S8, the ventilation function unit 2 is operated with the required processing air volume Qc. Then, in step S9, the air cleaning unit 1 is stopped, and the process returns to step S3.

If it is determined in step S7 that Qd is larger (corresponding to situation 2 in FIG. 2), a processing unit for the residual air volume is determined according to the following flow. In step S10, the residual air volume
Qy is calculated, and the room temperature sensor 6 and the outside air temperature sensor 7 detect the room temperature and the outside air temperature in steps S11 and S12. In step S13, the power consumption Wa when Qy is processed by the air cleaning unit 1 is calculated from Qy and the power consumption per unit processing air volume of the air cleaning device set in step S2.

In step S14, the power consumption Wvc of the ventilation function unit 2 when Qy is processed by the ventilation function unit 2 is calculated from Qy and the power consumption per unit processing air volume of the ventilation function unit 2 set in step S2. In step S15, the air-conditioning load Wcon generated when Qy is processed by the ventilation function unit 2 is calculated by comparing the air-conditioning load coefficient of the room set in step S2 with the air-conditioning load coefficient.
1. Calculate from the room temperature and the outside air temperature detected in step S12.

In step S16, Wcon generated by ventilation
Is processed by the air conditioner installed in the room, the power consumption Wac of the air conditioner required for the air conditioner is calculated by the coefficient of performance of the air conditioner set in step S2 and the air conditioning load Wcon calculated in step S15.
Is calculated from

In step S17, the total power consumption Wv generated when Qy is processed by the ventilator is calculated as the sum of the power consumption Wvc of the ventilation function unit 2 and the power consumption Wac of the air conditioner.

In step S18, the magnitudes of Wa and Wv are compared. That is, the power consumption when the residual air volume Qy is processed by the air cleaning unit 1 and the power consumption when the residual air volume Qy is processed by the ventilation function unit 2 are compared. If it is determined that Wa is smaller, step S
Qc component is a process air volume of CO ₂ at 19 only treated with ventilation function unit, the residual air volume Qy in step S20 is returned to step S3 and treated with air cleaning unit. If it is determined that Wv is smaller, both Qc and Qy, that is, Qd are processed by only the ventilation function unit in step S21, and the process returns to step S3.

With this configuration, the contaminant concentration can be kept below the reference value with the minimum energy while taking into account the power consumption of all of the air purifying section, the ventilation function section, and the air conditioner.

The effects of the first embodiment will be described with reference to FIGS. FIG. 4 is an example of a calculation result of the annual power consumption when the control method of the conventional example is used and the annual power consumption when the control method of the first embodiment is performed. This power consumption is the total value of the power consumption of the air conditioner for the air conditioning load increased by the air cleaning unit, the ventilation function unit, and the ventilation. From this figure, when the control method of the first embodiment is implemented, 20%
The above energy saving effect can be obtained.

FIG. 5 shows a calculation result of the annual operation time of the air cleaning unit when the control method of the conventional example is used and the annual operation time of the air purification unit when the control method of the first embodiment is performed. It is an example. According to this figure, the operation time of the air purifying section is 3
The number of maintenance operations such as filter cleaning can be reduced, and maintenance costs can be reduced.

The above embodiment does not limit the system of the air purifier, the ventilator, and the air conditioner itself.
For example, an air purifying device includes a filter type and an electric dust collecting type, and a ventilating device includes a ventilation fan and a total heat exchange type ventilation fan. The air purifier is one to the processing air volume compared to the ventilator.
Since it is not possible to remove 00% dust, it is also possible to calculate by multiplying the processing air volume by the removal efficiency and perform the above control, and it is also possible to take measures such as changing the removal efficiency by the air cleaning method. Also, when the total heat exchange type ventilation fan is used, the calculation method of the air conditioning load Wcon generated by the ventilation device in step S15 in FIG. 3 is such that the air conditioning load is reduced only by the heat exchange. It is also possible to respond to In the above-described embodiment, CO ₂ is set as a pollutant that cannot be removed by the air cleaning device, and the CO ₂ sensor is used, but other pollutants that cannot be removed by the air cleaning device are set. A sensor which is a pollutant concentration detecting means corresponding to the substance may be used.

Embodiment 2 FIG. Hereinafter, a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a schematic diagram of a system according to the second embodiment, which has a dust concentration inference unit as a dust concentration detection unit instead of a dust sensor. 1 denote the same or corresponding parts. A method of inferring the dust concentration from the CO ₂ concentration detected by the CO ₂ sensor will be described with reference to FIGS.

FIG. 7 shows C in a smoking space such as a smoking area.
O is a graph showing a relationship between ₂ concentration and dust concentration. As shown in this figure, since both of them show a linear relationship if the average number of smokers is determined regardless of the ventilation volume or room volume, the dust concentration can be calculated from the CO ₂ concentration. Also, as shown in FIG. 8, the average number of smokers is statistically set approximately according to the type of the space, and thus can be set in advance as a set value depending on the purpose of the room.

From the above, since the dust concentration can be inferred without the need for a dust sensor, the same effect as in the first embodiment can be obtained. In the present embodiment, control is performed to eliminate the need for a dust sensor. However, in FIG. 7, since it is possible to infer the CO ₂ concentration from the dust concentration, a system that does not require a CO ₂ sensor can be configured.

[0029]

As described above, according to the present invention, the indoor air quality can be kept clean with a minimum amount of energy, and the operation time can be reduced as compared with the conventional air cleaning apparatus, so that the maintenance cost can be reduced.

The same effect can be obtained by omitting the dust sensor.

[Brief description of the drawings]

FIG. 1 is a system schematic diagram showing Embodiment 1 of the present invention.

FIG. 2 is a control conceptual diagram showing the first embodiment of the present invention.

FIG. 3 is a flowchart illustrating the first embodiment of the present invention.

FIG. 4 is a graph showing the effect of the first embodiment of the present invention.

FIG. 5 is a graph showing the effect of the first embodiment of the present invention.

FIG. 6 is a conceptual diagram showing a system according to a second embodiment of the present invention.

FIG. 7 is a control conceptual diagram showing Embodiment 2 of the present invention.

FIG. 8 is a diagram showing a list of average smoking counts according to the second embodiment of the present invention.

[Explanation of symbols]

1 air purification section, 2 ventilation function section, 3 CO ₂ sensor,
4 Dust sensor, 5 capacity calculator, 6 Room temperature sensor, 7
Outside temperature sensor, 8 Dust concentration inference unit.

Claims (2)

[Claims] An air purifying unit having a function of removing dust in the air; a ventilation function unit for exchanging indoor air and outdoor air; a dust concentration detecting means for detecting a dust concentration; Pollutant concentration detecting means for detecting the concentration of contaminants in the air that cannot be removed, based on the detection results of the dust concentration detecting means and the pollutant concentration detecting means, the dust concentration and the pollutant concentration are respectively determined. An operation capability of the air cleaning unit and the ventilation function unit for controlling the air purifying unit and the ventilation function unit to be equal to or less than a reference value, a capability operation unit for controlling and operating, a room temperature sensor for detecting an indoor temperature, From the air volume required for dust removal calculated by the capacity calculation unit,
When the air volume required for pollutant removal is large, the ventilation function unit is operated, and the means for stopping the air cleaning unit, and the air volume required for dust removal calculated by the capacity calculation unit,
When the air volume required for pollutant removal is small, the air volume required for pollutant removal is processed by the ventilation function unit, and the remaining air volume is the inside / outside temperature detected by the room temperature sensor and the outside air temperature sensor during operation of the ventilation function unit. Means for selecting and operating and processing the air purifying unit and the ventilation function unit so that the overall power consumption is reduced in consideration of the fact that the power consumption by the air conditioning load depending on the difference is added, An air purifier characterized by comprising: 2. A constitutes the contaminant concentration detection means with CO ₂ sensor, and characterized in that the dust concentration detection means is constituted by the CO ₂ dust concentration inference section from the CO ₂ concentration by the sensor to infer dust concentration The air purifying device according to claim 1, wherein