JPH06272919A - Air conditioning equipment - Google Patents

Abstract

PURPOSE:To provide an air conditioner in which a carbonic acid gas sensor using solid electrolyte is mounted, an accurate and continuous measuring of concentration of carbonic acid gas and an automatic operation is carried out in response to a result of measurement. CONSTITUTION:An air conditioner 20 is operated such that dampers 38A, 38B are opened during a normal operation, a bypass damper 38C is closed, indoor air is contacted with a carbonic acid gas sensor 28 through an indoor air discharging passage 34 and then a concentration of included carbonic acid gas is measured. A controller 26 performs a controlling operation in the case that a high measured concentration of carbonic acid gas is attained, an operation mode of 'LOSS-NAI' (No loss) system 21 is set to a high operation and in the case that a low concentration of carbonic acid gas is attained, an operation mode of 'LOSS-NAI' (No loss) system 21 is set to a weak operation. In turn, in the case that the carbonic gas sensor 28 is modified, the dampers 38A, 38B are closed, a bypass damper 38C is opened to cause the surrounding air to circulate in sequence from the surrounding air suction port 22, a surrounding air supplying passage 36, a bypass passage 40 and an indoor air discharging passage 34. Then, the surrounding air having a known concentration of carbonic 28 so as to perform a modification of the sensor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly to an improvement of an air conditioner equipped with a carbon dioxide sensor.

[0002]

2. Description of the Related Art At present, the carbon dioxide concentration in the building management method is 1000 in a building with a total area of 3000 m ² or more.
It is set to ppm or less. An optical sensor has heretofore been used as a sensor for detecting this minute amount of carbon dioxide concentration.

However, since the optical sensor is expensive, there is a cost problem in mounting the optical sensor inside an air conditioner having a ventilation function and installing a plurality of such sensors in a building.

Therefore, at present, a carbon dioxide gas sensor using a solid electrolyte based on the principle of an inexpensive concentration battery has been proposed. An example of a carbon dioxide gas sensor using this solid electrolyte is disclosed in Japanese Patent Laid-Open No. 1-269048.

FIG. 15 is a side sectional view of a gas sensing portion in a carbon dioxide gas sensor using a solid electrolyte.
Further, FIG. 16 is a configuration diagram showing the overall configuration of the carbon dioxide sensor.

That is, as shown in FIG. 15, the gas sensing section 7 comprises an ion conductive ceramic (NASICON) 1 made of a solid electrolyte, and a pair for extracting the electromotive force signal on both sides of the ion conductive ceramic 1. Porous electrodes 2 and 3, lead wires 4 and 5 are connected to the electrodes 2 and 3, respectively, and sodium carbonate (Na ₂ CO ₃ ) 6 is coated in the recess of the electrode 2. ing.

Further, as shown in FIG. 16, the gas sensing unit 7
Is arranged on the upper surface of the heater 8, and lead wires 9 and 10 are connected to the heater 8.
Are connected to the metal pins 11 and 12 for voltage application. The lead wires 4 and 5 are the metal pins 1 for signal output.
Metal pins 11 and 12 for voltage application, which are connected to 3 and 14
The signal output metal pins 13 and 14 are fixed to the pedestal 15. The gas detector 7, the heater 8 and the like are protected by a protector 16 made of stainless steel wire mesh.

The carbon dioxide sensor detects the carbon dioxide concentration by utilizing the following battery reaction. That is, when the gas sensing unit 7 is heated to several hundreds of degrees Celsius by the heater 8, the following reactions occur at the electrodes 2 and 3 which function as a cathode and an anode, respectively.

[0009]

[Equation 1] In this way, the number of electrons e changes according to the change in carbon dioxide concentration, and the electromotive force generated at both ends changes. This electromotive force E is represented by a relational expression called the Nernst's equation shown below, which is proportional to the logarithm of the carbon dioxide concentration P _CO2 .

[0010]

[Equation 2] If this electromotive force E is taken out from the electrodes 2 and 3, the carbon dioxide concentration can be electrically detected, and an inexpensive carbon dioxide sensor can be provided.

[0011]

However, as shown in FIG. 17, the output voltage of the carbon dioxide sensor using the solid electrolyte decreases as the number of days elapses. Therefore, if used for a long time, the carbon dioxide concentration will be 300
A voltage lower than the voltage that should be output at 0 ppm is output, and the measurement result is, for example, 5000 pp.
There was a problem of becoming m. In such a case, it was difficult to accurately measure the absolute value of the carbon dioxide concentration.

For this reason, it is difficult to continuously measure the absolute value of the gas concentration corresponding to the building management method, and it is also difficult to control the operation of the air conditioner and its system by the above sensor. .

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to mount a carbon dioxide gas sensor using a solid electrolyte and continuously measure the carbon dioxide gas concentration with high accuracy. It is to provide an air conditioner that operates automatically.

[0014]

In order to achieve the above-mentioned object, the invention according to claim 1 is an air conditioner, which supplies outside air into a room, and an outside air supply passage having a first valve in the middle thereof, An indoor exhaust gas discharge passage for discharging indoor exhaust air to the outside of the room and a second valve in the middle of the indoor exhaust gas; a carbon dioxide sensor provided in the indoor air discharge passage upstream of the second valve; It is provided downstream of the first valve and upstream of the second valve and downstream of the carbon dioxide sensor so as to bridge the outside air supply passage and the indoor air discharge passage, and a third valve is provided in the middle of the passage. An bypass circulator, an air circulator that connects the outside air supply passage and the indoor exhaust discharge passage to the inside of the room, and sucks and discharges indoor and outdoor air; and operations of the first, second, and third valves. A controller for controlling the operation of the air circulator, During operation, by opening the first valve and the second valve and closing the third valve, air is circulated from the outside air supply passage to the indoor air discharge passage to bring indoor air into contact with the carbon dioxide sensor. Then, the concentration of carbon dioxide gas in the room air is measured, and based on the measurement, the controller changes the operation intensity of the air circulator to calibrate the output of the carbon dioxide gas sensor. By closing the valve and the second valve and opening the third valve,
The outside air having a known carbon dioxide concentration is circulated through the bypass passage, the outside air is brought into contact with the carbon dioxide sensor, calibration is performed, and the outside air and the indoor air are circulated, and the concentration of carbon dioxide is almost constant every certain period. It is characterized in that the concentration of carbon dioxide gas in the indoor air is measured while calibrating the carbon dioxide sensor by circulating fresh outside air.

According to a second aspect of the present invention, in the air conditioner, the outside air is supplied into the room, the outside air supply passage having the first valve in the middle of the room, and the room air is discharged to the outside of the room. An indoor air discharge passage having two valves; a carbon dioxide gas sensor provided in the indoor air discharge passage upstream of the second valve; and in the vicinity of the carbon dioxide gas sensor, A temperature / humidity sensor for measuring humidity and temperature, and a bridge between the outside air supply passage and the indoor air discharge passage downstream of the first valve and upstream of the second valve and downstream of the carbon dioxide sensor. A bypass passage having a third valve in the middle thereof, the indoor air supply passage and the indoor exhaust air discharge passage are connected to each other, and an air circulator for sucking and discharging indoor and outdoor air; Operation of first, second and third valves and air circulation And a controller for controlling the operation,
In normal operation, open the first valve and the second valve,
By closing the third valve, air is circulated from the outside air supply passage to the indoor air discharge passage, and the indoor air is brought into contact with the carbon dioxide sensor and the greenhouse sensor, so that the carbon dioxide concentration in the indoor air and the greenhouse degree are increased. When changing the intensity of the operation of the air circulator by the controller based on the measurement, and calibrating the output of the carbon dioxide sensor, close the first valve and the second valve, By opening the third valve, the outside air having a known carbon dioxide concentration is circulated through the bypass passage, the outside air is brought into contact with the carbon dioxide sensor, the calibration is performed, and the outside air and the room air are circulated, and at the same time The carbon dioxide concentration in the room air is measured while calibrating the carbon dioxide sensor by circulating the outside air having a substantially constant carbon dioxide concentration for each period. Further, the invention according to claim 3 is an air conditioner, which is provided with an outside air supply passage for supplying outside air into a room and an indoor air discharge passage for discharging indoor air to the outside, and sucks outside air to suck outside air. An air conditioner having an outdoor side and an exhaust air outlet for discharging indoor air, which is rotatably rotatably supported inside thereof and extends in the longitudinal direction from the outdoor air suction port to the outdoor air supply passage. And a rectangular column-shaped permeation type pre-heat exchanger provided so as to be orthogonal to the flow path from the room air discharge passage to the exhaust air discharge port, and the longitudinal direction of the permeation type pre-heat exchanger. A carbon dioxide sensor provided on one side, an air circulator provided in the air conditioner, and a controller for controlling the operation of the air circulator, and four sides in the longitudinal direction of the permeation type total heat exchanger are , The outside air suction port, outside air supply passage, indoor air release, respectively Facing the passage and the exhaust discharge port, the outside air flows in from the outside air suction port and passes from one surface in the longitudinal direction of the permeation type front heat exchanger on the outdoor side to the indoor side surface facing the surface. On the other hand, the indoor air that reaches the outside air supply passage flows in from the inside air discharge passage, and passes from the other surface in the longitudinal direction of the permeation type preheat exchanger on the indoor side to the surface on the outdoor side opposite to this surface. Then, when measuring the carbon dioxide concentration in the indoor air that reaches the exhaust discharge port, the permeation type preheat exchanger is placed so that the carbon dioxide sensor faces the side facing the exhaust discharge port outside the room. Setting, contacting the indoor air with the carbon dioxide sensor, measuring the carbon dioxide concentration in the room air, based on the measurement, change the operation intensity of the air circulator by the controller, the output of the carbon dioxide sensor When calibrating the Wherein the side facing the feed path by rotating the translucent front heat exchanger as carbon dioxide sensor faces, contacting the outside air into the carbon dioxide sensor, to perform calibration, with circulating the outside air and room air,
The carbon dioxide concentration in the room air is measured while calibrating the carbon dioxide sensor by circulating the outside air having a substantially constant carbon dioxide concentration at regular intervals.

[0016]

According to the first and second aspects of the invention, the bypass passage is located downstream of the first valve and upstream of the second valve and downstream of the carbon dioxide sensor, and the outside air supply passage and the indoor air discharge passage are provided. Since it is provided so as to bridge between and, it is possible to secure a passage for circulating only the outside air. Further, since the third valve is provided in the middle of the bypass passage, and the first valve and the second valve are provided in the middle of the outside air supply passage and the indoor air discharge passage, respectively, it is only necessary to open and close each valve. It is possible to switch between circulation of outside air / indoor air in the air conditioner and circulation of outside air for sensor calibration. Also, depending on the controller,
The strength of the air circulator can be changed based on the carbon dioxide concentration.

Further, according to the structure of claim 2, since the temperature and humidity sensor is provided in the vicinity of the carbon dioxide sensor,
The humidity and temperature characteristics of the gas contacting the carbon dioxide sensor can be grasped, and the measurement accuracy of the carbon dioxide sensor is improved based on this information.

According to the third aspect of the present invention, the square columnar permeation type pre-heat exchanger is rotatably supported in the air conditioner, and the longitudinal direction thereof is supplied from the outside air suction port to the outside air. The carbon dioxide gas sensor was provided so as to be orthogonal to the flow path to the passage and the flow path from the indoor air discharge passage to the exhaust gas discharge port, and on one surface in the longitudinal direction of the permeation type preheat exchanger. Therefore, when measuring the carbon dioxide concentration in the indoor air, set the permeation type pre-heat exchanger so that the carbon dioxide sensor faces toward the exhaust outlet on the outdoor side, and set the indoor air to the carbon dioxide sensor. It is possible to measure the concentration of carbon dioxide gas in the indoor air by contacting with. On the other hand, when calibrating the output of the carbon dioxide sensor, the permeation type preheat exchanger is rotated so that the carbon dioxide sensor faces toward the side of the indoor side that faces the outside air supply passage, and the outside air contacts the carbon dioxide sensor. The carbon dioxide sensor can be calibrated by performing the above operation at regular intervals.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

First Embodiment FIG. 1 is a schematic diagram showing a schematic configuration of a first embodiment of an air conditioner according to the present invention. FIG. 2 is a diagram for explaining the flow of air in normal operation in the air conditioner of FIG. Figure 3
FIG. 3 is a diagram for explaining the air flow of a gas sensor calibration operation in the air conditioner of FIG. 1.

As shown in FIG. 1, the air conditioner 20 is provided with an outdoor inlet 22 for sucking outside air and an outdoor outlet 24 for exhausting indoor air on the outside of the Rossnai 21, while the inside of the Rossnai 21 is closed. Includes an outside air supply passage 36 for supplying outside air to the room and an indoor air discharge passage 3 for discharging the room air to the outside.
And 4 are provided.

An indoor air outlet 32 is provided upstream of the outdoor air supply passage 36 to blow the outdoor air into the room, and a damper 38B for controlling the flow of air is provided between the indoor air outlet 32 and the LOSSNAY 21. It is provided.

On the other hand, an indoor air inlet 30 for sucking indoor air is provided downstream of the indoor air discharge passage 34, and a damper 38A for controlling the flow of air is provided between the indoor air inlet 30 and the LOSSNAY 21. It is provided. Further, a carbon dioxide gas sensor 28 is arranged downstream of the damper 38A and near the Rossnai 21 so that the exhausted indoor air comes into contact therewith. In the case of this embodiment, a carbon dioxide gas sensor using an inexpensive solid electrolyte is used as the carbon dioxide gas sensor 28.

The indoor air discharge passage 34 and the outside air supply passage are located at a position downstream of the carbon dioxide sensor 28 in the indoor air discharge passage 34 and upstream of the damper 38A, and at a position downstream of the damper 38B in the outside air supply passage 36. A bypass passage 40 bridging 36 is provided. A bypass damper 38C is provided in the bypass passage 40.

Then, the controller 26 installed outside the Rosnai 21 outputs the output signal of the carbon dioxide sensor 28,
That is, the damper 38A, depending on the carbon dioxide concentration in the room air,
It controls the opening / closing of 38B and 38C and the air conditioning in the LOSSNAY 21.

Next, the normal operation and the calibration operation of the carbon dioxide sensor of the above embodiment will be described. The arrows in FIGS. 2 and 3 indicate the flow of air. Further, inside the Rossnai 21, a Rossnai element 42 shown by a broken line is provided. The Rossnai element 42 will be described later, but in the present embodiment, a total permeation type total heat exchanger is used as the Rossnai element 42.

First, as shown in FIG. 2, in the normal operation, first, the dampers 38A and 38B are opened and the bypass damper 3 is opened.
Close 8C. As a result, the outside air is sucked from the outdoor suction port 22, flows into the outside air supply passage 36 via the Rossnai element 42, and is supplied to the room from the indoor outlet 32.
Then, the exhaust of the indoor air is sucked from the indoor suction port 30, passes through the indoor air discharge passage 34, contacts the carbon dioxide gas sensor 28, and is further discharged from the outdoor air outlet 24 via the Rossnai element 42. In this case, the carbon dioxide sensor 28
Measures the carbon dioxide concentration in the room air. Then, based on the measured value of the carbon dioxide concentration, the controller 26 sets the operation mode of the Rosnai 21 to the strong operation when the carbon dioxide concentration is high, and the controller 26 of the Rosnai 21 when the carbon dioxide concentration is low. Control the operation mode to weak operation.

On the other hand, when calibrating the carbon dioxide sensor 28, first, the dampers 38A and 38B are closed and the bypass damper 38C is opened. As a result, the outside air is sucked from the outdoor suction port 22 and flows into the outside air supply passage 36 via the Rossnai element 42. Further, since the damper 38B is closed, the indoor air discharge passage 34 is provided via the bypass passage 40.
Flow into. Since the damper 38A is also closed here,
The outside air comes into contact with the carbon dioxide sensor 28 and is discharged from the outdoor outlet 24 via the Rossnai element 42. In this way, by circulating the outside air, the carbon dioxide sensor 2
No. 8 measures the carbon dioxide concentration in the outside air, and calibrates the measured value so that the measured value is 350 ppm, which is the concentration of carbon dioxide contained in the outside air.

Second Embodiment FIG. 4 is a schematic diagram showing a schematic configuration of a second embodiment of the air conditioner according to the present invention. The configuration is almost the same as that of FIG. 1, but in the case of the air conditioner 20 of this embodiment, the carbon dioxide gas sensor 2 is used.
A temperature / humidity sensor 44 is provided downstream of the controller 8 and is connected to the controller 26. Normally, when the difference between the indoor temperature and the outdoor temperature and humidity is very large, the output of the carbon dioxide sensor 28 slightly changes. Therefore, by compensating the output of the carbon dioxide gas sensor 28 based on the output of the temperature / humidity sensor 44, the carbon dioxide gas concentration can be accurately measured and the Rossnai 21 can be operated efficiently even in the above case.

Next, the structure of the LOSSNAY 21 described in the above embodiment will be described.

FIG. 5 is a schematic diagram showing a schematic structure of the Rosnai 21. FIG. 6 is a diagram illustrating the configuration of the Rosnai element 42 and the flow of air.

As shown in FIG. 5, the inside of the LOSSNAY 21 is divided into four chambers. The exhaust blower 46 is on the right side from the outside of the room, and the air supply blower 4 is on the left side of the room.
8 are provided. On the other hand, pre-filters 50 are provided near the Rossnai element 42 on the left side as viewed from the outside and on the right side as viewed from the inside of the room, respectively.

Therefore, the outside air is sucked by the operation of the air supply blower 48, and the prefilter 50 removes the duct and the like in the outside air before passing through the Rosnai element 42. On the other hand, the indoor air is sucked by the operation of the exhaust blower 46, and at that time, the pre-filter 50 removes the duct and the like in the room before passing through the Rossnai element 42. Further, the Rosnai element 42 is a total permeation type total heat exchanger, and as shown in FIG. 6, a partition plate 54 made of specially processed paper woven in an uneven shape between partition plates 52 made of specially processed paper. Are sandwiched, and this is formed in layers. Then, as shown by the white arrow in the figure, fresh air passes toward the opposite side and dirty air passes so as to intersect with it.

Third Embodiment FIGS. 7 and 8 are schematic views showing a schematic configuration of a third embodiment of an air conditioner according to the present invention. FIG. 7 is a schematic diagram showing a schematic configuration particularly during the calibration operation of the third embodiment. Figure 8
FIG. 4 is a schematic diagram showing a schematic configuration of the third embodiment during normal operation. In the case of this embodiment, the bypass passage and the damper are not required unlike the first and second embodiments. That is, in the case of the present embodiment, a carbon dioxide gas sensor is built in the Rosnai element 42, and this Rosnai element 42 is rotated by 90 ° about the Rosnai element shaft to measure the carbon dioxide concentration in the indoor air or to measure the outside air. Can be circulated to calibrate the carbon dioxide sensor.
The details will be described below. Although not shown, it is divided into four chambers as described above.

First, the normal operation will be described. Figure 8
As shown in, the carbon dioxide sensor is housed above the outdoor side. Therefore, the outside air is sucked from the outdoor suction port 22 as shown by the white arrow, and the lossy element 4
2 passes from the lower side of the outdoor side toward the opposite side, and is supplied indoors from the indoor outlet 32 without touching the carbon dioxide sensor. On the other hand, the indoor air is sucked from the indoor blow-in port 30 as shown by the black arrow, passes through from the lower indoor side of the Rossnai element 42 toward the opposite side, passes through the carbon dioxide sensor at that time, and passes through the outdoor blow-out port 24. Is released. As a result, the carbon dioxide concentration in the indoor air is measured, and the controller 26 can control the operating condition of the Rosnai 21.

On the other hand, when calibrating the gas sensor,
As shown in FIG. 7, the Rossnai element 42 is rotated 90 ° about the Rossnai element shaft from the state of FIG.
Install it so that the carbon dioxide sensor faces upward in the room.
As a result, the outside air is sucked from the outdoor suction port 22 as shown by the white arrow and passes from the lower side of the outdoor side of the Rossnai element 42 toward the upper side of the facing indoor side. At this time, the outside air contacts the carbon dioxide sensor (several minutes to 10 minutes).
Air is supplied indoors from the indoor air outlet 32. On the other hand, indoor air is
As indicated by the black arrow, the air is sucked from the indoor blow-in port 30, passes from the lower indoor side of the Rossnai element 42 toward the opposite side, and is discharged from the outdoor blow-out port 24 without contacting the carbon dioxide sensor. Therefore, the carbon dioxide gas sensor measures the carbon dioxide gas concentration in the outside air, and calibrates it so that the measured value is 350 ppm, which is the concentration of carbon dioxide gas normally contained in the outside air.

The structure of the carbon dioxide sensor using the solid electrolyte used in the above examples will be described below. Figure 9
It is a figure which shows the structure of the battery of the carbon dioxide sensor element in a carbon dioxide sensor.

As shown in FIG. 9, in the carbon dioxide sensor, porous Au electrodes are formed on both ends of a Na ion conductive ceramic called NASICON, and Na ₂ CO ₃ is applied to only one side of the porous Au electrode. There is. When this element is heated to about 500 ° C., Na ₂ CO ₃ becomes CO in the atmosphere.
A dissociation equilibrium state corresponding to ₂ concentrations is reached. When the CO ₂ concentration increases from this state, the number of electrons e decreases as the Na ₂ CO ₃ is generated, and when the CO ₂ concentration decreases, the Na ₂ CO ₃ concentration decreases.
Moves in the direction of decomposition, and the number of electrons e increases. Thus, the number of electrons e changes according to the change in CO ₂ concentration,
The electromotive force generated at both ends changes. The CO ₂ concentration can be obtained from this electromotive force and the above-mentioned Nernst equation.

FIG. 10 shows a flow of the method for manufacturing the carbon dioxide sensor. First, NASICON is manufactured as follows. That is, ZrSIO ₄ and Na ₃
PO ₄ is mixed at a molar ratio of 1: 2 and dehydrated and dried at 200 ° C. After that, crush and mold, calcination at ~ 1100 ° C,
The compound is identified by a powder X-ray diffraction analyzer. After that, it is crushed and fired again, and the main firing is performed at ˜1200 ° C. to finish a dense pellet.

The element part was manufactured by using the N obtained by the above method.
ASIC pellets are cut into chips with a diamond cutter, Au electrodes are printed on both end faces, near wires are bonded, and Na ₂ CO ₃ is applied to the short die electrode faces.

After that, the sensor is manufactured by incorporating the element part manufactured by the above method into the coil heater.

FIG. 11 is a bird's eye view of the carbon dioxide sensor. In the carbon dioxide sensor 28, the wires from the carbon dioxide sensor element 56 and the coil heater 58 are connected to the electrode pins 62, respectively, and the electrode pins 62 are fixed by the system 60.

FIG. 12 is a cross sectional view of a coil heater of a carbon dioxide sensor. FIG. 13 is a cross-sectional view taken along the line AA of FIG.

As shown in FIG. 12, the carbon dioxide gas sensor element 56 is incorporated in the coil heater 58, and as shown in FIG. 13, the carbon dioxide gas sensor element 56 is fixed in the coil heater 58 by the heat resistant inorganic coating agent 72. ,
Tension is not applied to the gold wire 70 for signal extraction. In addition, heat resistant inorganic coating agent 7
2 protects the surface of the NASICON chip 66 from moisture and carbon dioxide in the atmosphere and prevents the film from being formed.

FIG. 14 shows an operating circuit of the carbon dioxide gas sensor. The carbon dioxide gas sensor can be regarded as a battery, and is represented by an equivalent circuit in which an electrode surrounded by a dotted line and an internal resistance are connected in series. An impedance conversion circuit using an FET is provided between the sensor and the negative charge in order to take out an output without passing a current.

[0046]

As described above, according to the air conditioner of the present invention, the bypass passage is connected to the outside air supply passage downstream of the first valve and upstream of the second valve and downstream of the carbon dioxide sensor. Since it is provided so as to bridge the indoor air discharge passage, it is possible to secure a passage for circulating only the outside air. Further, since the third valve is provided in the middle of the bypass passage, and the first valve and the second valve are provided in the middle of the outside air supply passage and the indoor air discharge passage, respectively, it is only necessary to open and close each valve. It is possible to switch between circulation of outside air / indoor air in the air conditioner and circulation of outside air for sensor calibration. Further, the strength of the air circulator can be changed based on the carbon dioxide concentration.

Further, since the temperature and humidity sensor is provided in the vicinity of the carbon dioxide sensor, the humidity and temperature characteristics of the gas contacting the carbon dioxide sensor can be grasped, and the characteristic variation of the carbon dioxide sensor is compensated based on this information. This improves the measurement accuracy of the carbon dioxide sensor.

Further, a square columnar permeation type pre-heat exchanger is rotatably supported in the air conditioner, and its longitudinal direction is a flow path from the outside air suction port to the outside air supply passage and the indoor air discharge. The carbon dioxide gas concentration in the room air can be increased by providing the carbon dioxide gas sensor on one surface in the longitudinal direction of the permeation type preheat exchanger so as to be orthogonal to the flow path from the passage to the exhaust gas discharge port. When measuring, the permeation type pre-heat exchanger is set so that the carbon dioxide sensor faces toward the exhaust outlet on the outdoor side, and the indoor air is brought into contact with the carbon dioxide sensor, The concentration can be measured.
On the other hand, when calibrating the output of the carbon dioxide sensor, the permeation type preheat exchanger is rotated so that the carbon dioxide sensor faces toward the side of the indoor side that faces the outside air supply passage, and the outside air contacts the carbon dioxide sensor. The carbon dioxide sensor can be calibrated by performing the above operation at regular intervals. From the above, the building management method (carbon dioxide concentration 1000 pp
It is possible to provide an air conditioner having an inexpensive ventilation function corresponding to m or less).

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of a first embodiment of an air conditioner according to the present invention.

FIG. 2 is a diagram illustrating a flow of air in normal operation in the air conditioner of FIG.

FIG. 3 is a diagram illustrating an air flow of a gas sensor calibration operation in the air conditioner of FIG.

FIG. 4 is a schematic diagram showing a schematic configuration of a second embodiment of an air conditioner according to the present invention.

FIG. 5 is a schematic diagram showing a schematic configuration of Rosnai.

FIG. 6 is a diagram illustrating a configuration of a Rosnai element and a flow of air.

FIG. 7 is a schematic diagram showing a schematic configuration during a calibration operation of a third embodiment of an air conditioner according to the present invention.

FIG. 8 is a schematic diagram showing a schematic configuration of a third embodiment of the air conditioner according to the present invention during normal operation.

FIG. 9 is a diagram showing a battery structure of a carbon dioxide gas sensor element in a carbon dioxide gas sensor.

FIG. 10 is a diagram showing a flow of a method for manufacturing a carbon dioxide sensor.

FIG. 11 is a bird's-eye view of a carbon dioxide sensor.

FIG. 12 is a cross-sectional view of a coil heater of the carbon dioxide sensor.

13 is a cross-sectional view taken along the line AA of FIG.

FIG. 14 is an operation circuit of a carbon dioxide sensor.

FIG. 15 is a side sectional view of a gas sensing portion in a carbon dioxide gas sensor using a solid electrolyte.

16 is a configuration diagram showing an overall configuration of the carbon dioxide sensor of FIG.

FIG. 17 is a graph showing deterioration with time of a carbon dioxide sensor using a conventional solid electrolyte.

[Explanation of symbols]

 20 air conditioner 21 LOSSNAY 22 outdoor intake port 24 outdoor outlet 26 controller 28 carbon dioxide sensor 30 indoor inlet 32 indoor outlet 34 indoor air discharge passage 36 outdoor air supply passage 38A, 38B damper 38C bypass damper 40 bypass passage

Claims (3)

[Claims] 1. An outdoor air supply passage for supplying outside air into a room, the outdoor air supply passage having a first valve in the middle thereof, and an indoor exhaust air discharged to the outside of the room, and an indoor exhaust air passage having a second valve in the middle thereof, Inside the indoor air discharge passage, a carbon dioxide gas sensor provided upstream of the second valve, and downstream of the first valve and upstream of the second valve and downstream of the carbon dioxide sensor. A bypass passage that is provided so as to bridge the outside air supply passage and the indoor air discharge passage, and has a third valve in the middle, and the outside air supply passage and the indoor exhaust discharge passage that are connected to the indoor side An air circulator that sucks in and discharges the air, and a controller that controls the operation of the first, second, and third valves and the operation of the air circulator, and in the normal operation, the first valve Open the second valve,
By closing the third valve, air is circulated from the outside air supply passage to the indoor air discharge passage, the indoor air is brought into contact with the carbon dioxide sensor, and the carbon dioxide concentration in the indoor air is measured. On the basis of changing the intensity of the operation of the air circulator by the controller to calibrate the output of the carbon dioxide sensor,
By closing the valve and the second valve and opening the third valve, the outside air having a known carbon dioxide concentration is circulated through the bypass passage, and the outside air is brought into contact with the carbon dioxide sensor,
Calibration is performed, and the outside air and the indoor air are circulated, and at the same time, the outside air having a substantially constant carbon dioxide concentration is circulated at regular intervals to calibrate the carbon dioxide sensor to measure the carbon dioxide concentration in the inside air. Air conditioning equipment to be. 2. An outdoor air supply passage for supplying outside air into a room and having a first valve in the middle thereof, and an indoor air discharge passage for discharging indoor air to the outside of the room and having a second valve in the middle thereof, A carbon dioxide sensor provided in the indoor air discharge passage on the upstream side of the second valve; a temperature / humidity sensor provided in the vicinity of the carbon dioxide sensor to measure humidity and temperature in the indoor air; It is provided downstream of the first valve and upstream of the second valve and downstream of the carbon dioxide sensor so as to bridge the outside air supply passage and the indoor air discharge passage, and a third valve is provided in the middle of the passage. A bypass passage, an air circulator that connects the outside air supply passage and the indoor exhaust air passage to the inside of the room, and sucks and discharges indoor and outdoor air; and operations of the first, second, and third valves, A controller for controlling the operation of the air circulator, During normal operation, it opens the first and second valves,
By closing the third valve, air is circulated from the outside air supply passage to the indoor air discharge passage, and the indoor air is brought into contact with the carbon dioxide sensor and the greenhouse sensor, so that the carbon dioxide concentration in the indoor air and the greenhouse degree are increased. When the output of the carbon dioxide sensor is calibrated by changing the intensity of the operation of the air circulator by the controller based on the measurement,
By closing the valve and the second valve and opening the third valve, the outside air having a known carbon dioxide concentration is circulated through the bypass passage, and the outside air is brought into contact with the carbon dioxide sensor,
Calibration is performed, and the outside air and the indoor air are circulated, and at the same time, the outside air having a substantially constant carbon dioxide concentration is circulated at regular intervals to calibrate the carbon dioxide sensor to measure the carbon dioxide concentration in the inside air. Air conditioning equipment to be. 3. An outside air supply passage for supplying outside air to the room,
An air conditioner having an indoor air discharge passage for discharging indoor air to the outside, an outside air suction port for sucking outside air, and an exhaust air outlet for discharging indoor air on the outside, It is rotatably supported inside thereof and its longitudinal direction is orthogonal to the flow path from the outside air suction port to the outside air supply passage and the flow path from the indoor air discharge passage to the exhaust discharge port. A rectangular column-shaped permeation type pre-heat exchanger, a carbon dioxide sensor provided on one surface in the longitudinal direction of the permeation type pre-heat exchanger, an air circulator provided in an air conditioner, and the air circulation And a controller for controlling the operation of the device, wherein the four sides in the longitudinal direction of the permeation type total heat exchanger respectively face the outside air suction port, the outside air supply passage, the indoor air discharge passage and the exhaust air discharge port, and Flows in through the outside air suction port, and the From the longitudinal one surface of the pre-heat exchanger to the outside air supply passage through the surface on the indoor side opposite to this surface, while the indoor air flows in from the indoor air discharge passage and permeates the indoor side. When the carbon dioxide concentration in the room air is measured when the carbon dioxide concentration in the room air is measured, the other side of the longitudinal direction of the preheater heat exchanger passes through the surface on the outside of the room facing the surface and reaches the exhaust discharge port. The permeation type pre-heat exchanger is set so that the carbon dioxide sensor faces the side facing the exhaust gas discharge port, the indoor air is brought into contact with the carbon dioxide sensor, and the carbon dioxide concentration in the indoor air is measured, and the measurement is performed. When the output of the carbon dioxide gas sensor is calibrated by changing the operation intensity of the air circulator by the controller based on the above, the permeation is performed so that the carbon dioxide gas sensor faces the side facing the outside air supply passage on the indoor side. Rotate the front heat exchanger Then, the outside air is brought into contact with the carbon dioxide sensor to calibrate it, and the outside air and the room air are circulated, and at the same time, the outside air having a substantially constant carbon dioxide concentration is circulated at regular intervals to calibrate the carbon dioxide sensor while the indoor air is calibrated. An air conditioner characterized by measuring the concentration of carbon dioxide inside.