JP5301772B2 - Air conditioning system - Google Patents

Description

  The present invention relates to an air conditioning system that inactivates fungi trapped in a medium performance filter using active oxygen generated during ozonolysis.

  For example, in a space to be air-conditioned formed in a building such as an office building, harmful chemical substances such as formaldehyde and ozone are generated from a copying machine or the like. Conventionally, a method of decomposing a harmful chemical substance generated in such an air-conditioning target space using a photocatalyst such as titanium oxide is known (for example, Patent Documents 1 and 2). In addition, a method for decomposing miscellaneous bacteria using a proteolytic enzyme or the like is also known (for example, Patent Documents 3 and 4).

  Moreover, the present applicant has previously disclosed a method for disinfecting ozone with a metal compound catalyst and performing sterilization and deodorization in the air with oxygen radicals generated by the decomposition in Patent Document 5 (patent) Reference 5).

JP 2000-117021 JP 2001-246227 A Japanese Patent No. 3790479 JP 2005-7349 A JP 2006-75402 A

  However, in the methods of Patent Documents 1 and 2, there is no light source such as illumination inside the duct or chamber, and it is necessary to install a lamp in order to decompose harmful chemical substances such as formaldehyde and ozone. Therefore, when it is used for centralized building air conditioning, the equipment cost becomes high, and the lamps need to be periodically cleaned and replaced. In addition, the methods of Patent Documents 3 and 4 require that the humidity and temperature be kept high in order to activate the enzyme. Therefore, Patent Document 3 requires a heating mechanism, and Patent Document 4 requires a water supply mechanism and a heating mechanism, which has the disadvantage of saving on installation inside the equipment and increasing equipment costs.

  On the other hand, according to the method of Patent Document 5, it is possible to quickly perform sterilization and deodorization in the air with oxygen radicals while providing a harmless environment for a human body having an indoor ozone concentration of 50 ppb or less. However, the indoor ozone concentration is desirably as low as possible, and further improvement is desired.

  Accordingly, an object of the present invention is to provide an air conditioning system capable of performing sterilization and deodorization in the air by oxygen radicals generated by the decomposition of ozone while reducing the ozone concentration in the air conditioning target space as low as possible. .

According to the present invention, air and air conditioner in the air conditioner, and the air supply to the air conditioning target space through the air supply duct, the air discharged from the air conditioning target space, to return to the air conditioner through the return air duct, said The air filter built in the air conditioner is arranged in close contact with the upstream side of the medium performance filter having a dust collection efficiency of 60% or more in the colorimetric method, and an ozone decomposition catalyst is arranged , and the exhaust from the air-conditioned space In the air conditioning system that inactivates the fungi and allergens collected in the medium performance filter by the active oxygen generated at the time of decomposing ozone contained in the atmosphere or ozone contained in the outside air with the ozone decomposition catalyst there are provided with a fresh air duct for taking external air into the air conditioner, the return air duct, the ozone generator is provided, dividing the ozone concentration in the air supplied to the ozone decomposing catalyst becomes a predetermined range As performance is stable, the operation of the ozone generator is being controlled, the air conditioning system is provided.

Incidentally, the air and air conditioner in the air conditioner, and the air supply to the air conditioning target space through the air supply duct, the air discharged from the air conditioning target space, back to the air conditioner through the return air duct, are incorporated in the air conditioner The air filter has a structure in which an ozone decomposition catalyst is disposed inside a medium performance filter having a dust collection efficiency of 60% or more by a colorimetric method, and ozone contained in the exhaust air from the air-conditioned space or in the outside air Is an air conditioning system that inactivates fungi and allergens collected by the medium performance filter with active oxygen generated at the time by the ozone decomposition catalyst, An air conditioning system is provided, characterized in that it comprises an incoming external air duct.

  Moreover, you may provide an ozone generator in the said return air duct.

Further, the operation of the ozone generator may be controlled so that the ozone generator is operated when the ozone concentration is lowered and the ozone concentration of the air supplied to the ozone decomposition catalyst falls within a predetermined range. .

  According to the air conditioning system of the present invention, ozone contained in the air exhausted from the air conditioning target space is decomposed by the ozone decomposition catalyst, and the fungi and allergen collected by the medium performance filter are obtained by the active oxygen generated by the decomposition. The ozone concentration in the air-conditioning target space can be reduced by inactivating and supplying the air that has been decomposed by the ozone decomposition catalyst to the air-conditioning target space.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram of an air conditioning system 1 according to an embodiment of the present invention. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  Between the air conditioner 10 and the air conditioning target space 11, an air supply duct 12 that supplies air to the air conditioning target space 11 from the air conditioner 10, and a return air duct 13 that returns air exhausted from the air conditioning target space 11 to the air conditioner 10. Is connected. The air conditioning target space 11 is a living room or the like formed in a building such as an office building. In the air-conditioning target space 11, harmful chemical substances such as formaldehyde and ozone are generated from a copying machine or the like.

  Inside the air conditioner 10, a pre-filter 19, an air filter 20, a cooling coil 21, a heating coil 22, a humidifier 23, and a blower 24 are arranged in order between the connection positions of the air supply duct 12 and the return air duct 13. Has been. Inside the air conditioner 10, a mixing chamber 25 is formed on the upstream side of the pre-filter 19, and air exhausted from the air-conditioned space 11 through the return air duct 13 is returned to the mixing chamber 25. .

  The air conditioner 10 is connected to an outside air duct 30 for supplying outside air taken from outside the building. The outside air duct 30 is provided with an air volume adjusting damper 31 for adjusting the intake amount of outside air. Further, a louver 32 is attached to the outside air intake port of the outside air duct 30 to prevent intrusion of rainwater or the like into the outside air duct 30. The outside air taken into the air-conditioning target space 11 through the outside air duct 30 is supplied to the mixing chamber 25. In this way, in the mixing chamber 25, the air exhausted from the air-conditioning target space 11 and the outside air taken in from the outside of the building are mixed, and the mixed air is mixed with the prefilter 19, the air filter 20, The cooling coil 21, the heating coil 22, and the humidifier 23 are passed through in this order. The prefilter 19 removes dust and the like contained in the outside air.

  As shown in FIG. 2, the air filter 20 has a configuration in which a coarse filter 35, an ozone decomposition catalyst 36, and a medium performance filter 37 are stacked, and air flowing in the air conditioner 10 by the power of the blower 24 as described above. The coarse filter 35, the ozone decomposition catalyst 36, and the medium performance filter 37 are passed in this order. The main purpose of the coarse filter 35 is to prevent the ozone decomposition catalyst 36 from being scattered when the air filter 20 is transported or handled. The ozonolysis catalyst 36 was added with activated carbon (granular activated carbon or activated carbon fiber), metal oxide (manganese dioxide, titanium dioxide, nickel dioxide or copper oxide) or a combination of metals such as silver and platinum. And those composites as a single substance or a mixture with a binder, which are made into a filter shape by a mixed paper method or the like. The medium performance filter 37 is a filter composed of a nonwoven fabric of resin such as polyester, polyolefin, polyacryl, and the like, and has a dust collection efficiency of 60% or more by a colorimetric method. The medium performance filter 37 may or may not be charged. When laminating the coarse filter 35, the ozone decomposition catalyst 36, and the medium performance filter 37, the ozone decomposition catalyst 36 is disposed in close contact with the upstream side of the medium performance filter 37 so that the air that has passed through the ozone decomposition catalyst 36 is immediately and continuously. It is configured to pass through the medium performance filter 37. When the ozone decomposition catalyst 36 is in close contact with the upstream side of the medium performance filter 37, the ozone decomposition catalyst 36 may be in close contact with the entire upstream surface of the medium performance filter 37, or ozone upstream of the medium performance filter 37. The cracking catalyst 36 may be arranged so as to be partially in close contact. However, the effects of sterilization and deodorization by oxygen radicals are further improved when the ozone decomposition catalyst 36 is in close contact with the entire upstream surface of the medium performance filter 37. Moreover, as a combination of the ozone decomposition catalyst 36 and the medium performance filter 37, generally available activated carbon + medium performance filter can be used. However, the direction of the filter is opposite to the manufacturer's standard, and the active carbon is arranged upstream and the medium performance filter is arranged downstream.

FIG. 3 shows another embodiment of the air filter 20. The air filter 20 shown in FIG. 3 has a configuration in which an ozone decomposition catalyst 36 is arranged inside a medium performance filter 37 having a dust collection efficiency of 60% or more by a colorimetric method. In the air filter 20 shown in FIG. 3, when the medium performance filter 37 is manufactured, the medium performance filter 37 is woven in a non-woven fabric with resin fibers 37 ′ such as polyester, polyolefin, polyacryl, etc. with an ozone decomposition catalyst attached to the surface. Thus, the ozone decomposition catalyst 36 is disposed inside the medium performance filter 37. When the ozone decomposition catalyst is attached to the resin fiber 37 ′, techniques such as a dipping method, a roller method, a spray method, a vacuum deposition method, and a kneading method can be used. The ozone decomposition catalyst 36 is added with activated carbon (granular activated carbon or activated carbon fiber), metal oxide (manganese dioxide, titanium dioxide, nickel dioxide or copper oxide) or a combination of metals such as silver and platinum. And the composites of these can be used alone or as a mixture with a binder. Moreover, the fiber diameter of resin fiber 37 'is about 1-10 micrometers, and is a tube shape here. In the air filter 20 shown in FIG. 3, the coarse filter 35 is unnecessary.

  Cooling water is appropriately circulated and supplied to the cooling coil 21 disposed on the downstream side of the air filter 20, and hot water is appropriately circulated and supplied to the heating coil 22. The cooling coil 21 and the heating coil 22 adjust the temperature of the air supplied into the air-conditioning target space 11 to a desired temperature.

  The humidifier 23 disposed on the downstream side of the heating coil 22 is appropriately supplied with water for humidification. The humidity of the air supplied into the air-conditioning target space 11 is adjusted to a desired humidity by the humidifier 23.

  An air volume adjustment damper 40 is provided in the air supply duct 12. By adjusting the opening degree of the air volume adjustment damper 40, the supply amount of air supplied into the air-conditioning target space 11 is adjusted.

  The return air duct 13 is provided with an air volume adjusting damper 41. An exhaust duct 45 is connected to the return air duct 13 on the upstream side of the air volume adjustment damper 41. The exhaust duct 45 is provided with an air volume adjusting damper 46 and a blower 47, and a part of the air exhausted from the air-conditioning target space 11 through the return air duct 13 is passed through the exhaust duct 45 by the power of the blower 47. Are discharged outside. The exhaust amount discharged through the exhaust duct 45 is adjusted by adjusting the opening degree of the air volume adjusting damper 40 provided in the air supply duct 12 and adjusting the opening degree of the air volume adjusting damper 41 provided in the return air duct 13. Is done. Further, a louver 48 is attached to the exhaust port of the exhaust duct 45 in order to prevent rainwater and the like from entering the exhaust duct 45.

  In the air conditioning system 1 according to the embodiment of the present invention configured as described above, in the air conditioner 10, the air exhausted from the air conditioning target space 11 and the outside air taken in from the outside of the building are mixed in the mixing chamber 25. The mixed air passes through the prefilter 19, the air filter 20, the cooling coil 21, the heating coil 22, and the humidifier 23 in this order by the power of the blower 24 and is air-conditioned. The air thus conditioned is supplied to the air-conditioned space 11 through the air supply duct 12. On the other hand, the air in the air conditioning target space 11 is exhausted to the return air duct 13, a part of the exhaust is exhausted to the outside of the building through the exhaust duct 45, and the rest is returned to the air conditioner 10. In this manner, air is circulated and supplied from the air conditioner 10 to the air-conditioning target space 11, thereby air-conditioning the air-conditioning target space 11.

  Here, inside the air-conditioning target space 11, harmful chemical substances such as formaldehyde and ozone are generated from a copying machine and the like, while the outside air contains about 0 to 120 ppb of ozone. Furthermore, it may contain allergens such as fungi (fungi / bacteria), pollen and pollen orbicles. When air mixed in the mixing chamber 25 passes through the air filter 20 in the air conditioner 10 by using the pollen orbicle (about 1 μm) and the medium performance filter 37 having high collection efficiency for fungi, Hazardous chemical substances such as formaldehyde contained in the air and microbial particles such as fungi and allergens are reliably collected upstream of the medium performance filter 37. Further, ozone contained in the air is decomposed by the ozone decomposition catalyst 36, and the fungi and allergen collected on the upstream side of the medium performance filter 37 can be inactivated by the active oxygen generated at that time. In this case, it is not necessary to provide a special light source such as illumination near the ozone decomposition catalyst 36 for the ozone decomposition. Further, although the lifetime of active oxygen is as short as about 0.1 ms, as shown in FIG. 2, the ozone decomposition catalyst 36 is disposed in close contact with the upstream side of the medium performance filter 37, or as shown in FIG. As described above, since the ozonolysis catalyst 36 is arranged inside the medium performance filter 37, the active oxygen generated by the ozonolysis can be reliably brought into contact with fungi and allergens and inactivated. In this way, clean air from which harmful chemical substances and ozone have been removed is supplied to the air-conditioning target space 11, and the collected fungi or the fungi that have propagated on the medium-performance filter 37 are detached from the medium-performance filter 37 to be air-conditioned. So-called “secondary contamination” supplied into the space 11 is also prevented, and the indoor air quality is improved. In addition, secondary deodorization and VOC decomposition can be performed with active oxygen.

  According to the present invention, the ozone concentration in the air-conditioning target space 11 can be controlled to several ppb or less, so that the indoor ozone concentration is within an allowable value (100 ppb) even if ozone is generated indoors, for example, from a copy machine. It becomes possible. In addition, generation of fine particles due to a reaction between ozone and organic matter can be suppressed in the room. As a result, the equipment cost is low, the indoor ozone concentration can be reduced, and an air conditioning system having sterilization performance can be provided. Since most of the fine particles generated by the reaction between ozone and organic matter can be collected by the medium performance filter 37, it is possible to prevent the dust concentration in the air-conditioning target space 11 from increasing.

  Since the air conditioning system of the present invention basically uses no ozone generator and decomposes and uses ozone contained in the outside air or exhaust from the air-conditioned space 11, the facility cost can be reduced. it can. Further, since the medium performance filter 37 can be the same size as the medium performance filter originally installed in the air conditioner 10, the air conditioner 10 is hardly remodeled and can be renewed. In the present invention, the grounds for setting the dust collection efficiency of the medium performance filter 37 to 60% or more by the colorimetric method are as follows. That is, the size of biological particles is generally bacteria: 0.5 to 10 μm, often 1 μm or more, fungus: 3 to 10 μm, many 5 μm or more, pollen: several tens of μm, however, the cedar pollen orbicle is about 1 μm It is said. The performance of the medium-performance filter is measured by the colorimetric method in the current JIS, but when measured by a counting method that measures the transmittance by changing the particle size, the filter with a colorimetric method of about 60% is 1 μm or more. There is a collection efficiency of 60-80% with respect to the particles. Therefore, in the present invention, by using the medium performance filter 37 having a dust collection efficiency of 60% or more in the colorimetric method, 60% or more of bacteria and almost all fungi can be physically collected even in one pass. Furthermore, since it is filtered many times when used in the circulatory system, most of the biological particles in the room are physically collected by the medium performance filter 37. However, since fungi collected by ordinary medium-performance filters are not killed, there is a possibility of re-scattering due to air pulsation, or so-called secondary contamination that causes mycelia to extend and spores to scatter on the lower surface of the filter. . Therefore, in the present invention, these influences are eliminated by inactivating the collected biological particles on the medium performance filter 37. That is, a medium performance filter 37 having a dust collection efficiency of 60% or more in colorimetric method is used for reliable physical collection, and an ozone decomposition catalyst 36 is used to eliminate the influence of re-scattering and secondary contamination. . In the current building air conditioning, a medium performance filter is generally used. This is because a medium performance filter or more is required to satisfy the dust concentration of the building pipe method. The so-called air conditioner cannot be equipped with a medium performance filter because the static pressure of the fan cannot be increased or the maintenance frequency is too high.

  As mentioned above, although an example of preferable embodiment of this invention was demonstrated, this invention is not limited to the form of illustration. It will be apparent to those skilled in the art that various changes or modifications can be made within the scope of the ideas described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  As shown in FIG. 4, the ozone concentration contained in the outside air is generally high in the daytime and low in the nighttime. Moreover, the ozone concentration contained in the exhaust air from the air-conditioning target space 11 is also high in the daytime and low in the nighttime. When stable sterilization performance is required, such as when operating air conditioning at night or early morning or when the ozone concentration in the outside air is low, such as on rainy days, as shown in FIG. 5, an ozone generator (ozonizer) ) 50 is installed in the return air duct 13. In this case, in the air conditioner 10, the ozone concentration of the air supplied to the air filter 20 is detected by the sensor 51 and input to the controller 52, and the operation of the ozone generator 50 is controlled by the controller 52. The ozone concentration of the air supplied to 20 is set to about 20 to 30 ppb.

  In this way, by controlling the operation of the ozone generator 50 installed in the return air duct 13, the ozone generator 50 is operated to compensate for the shortage of the ozone concentration against the decrease in the ozone concentration in the outside air. Can do. By installing the ozone generator 50 on the return air duct 13 side, the air conditioner 10 does not need to be remodeled. Further, since the temperature and humidity of the exhaust from the air-conditioning target space 11 is relatively stable, there is an advantage that the amount of ozone generated by the ozone generator 50 is also stabilized. Instead of the detection by the sensor 51, the ozone generator 50 may be operated as a timer only for the time during which the ozone concentration decreases by knowing the tendency of the ozone concentration in the outside air. The sensor 51 may be an ultraviolet sensor having a high correlation with the ozone concentration, in addition to the ozone concentration meter. Furthermore, the ozone generator 50 may be operated only when the ozone concentration is reduced by online ozone concentration information. It is desirable to reduce the operating time of the ozone generator 50 as much as possible to save energy and to prolong maintenance and replacement time of the ozone generator 50.

  In addition, the installation position of the ozone generator 50 is, for example, when the outside air amount is overwhelmingly larger than the circulating air amount, the ozone generator 50 is installed in the outside air duct 30 instead of the return air duct 13. Also good. The prefilter 19 shown in FIGS. 1 and 5 may be omitted.

  The present invention can be applied to air conditioning in office buildings and the like.

It is explanatory drawing of the air conditioning system concerning embodiment of this invention. It is explanatory drawing of the air filter which has arrange | positioned the ozone decomposition catalyst adjacent to the upstream of a medium performance filter. It is explanatory drawing of the air filter which has arrange | positioned the ozone decomposition catalyst inside the middle performance filter. It is a graph which shows the time-dependent change of the ozone concentration in outside air. It is explanatory drawing of the air conditioning system concerning embodiment of this invention which provided the ozone generator in the return air duct.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air conditioning system 10 Air conditioner 11 Air-conditioning object space 12 Air supply duct 13 Return air duct 19 Prefilter 20 Air filter 21 Cooling coil 22 Heating coil 23 Humidifier 24 Blower 30 Outside air duct 35 Coarse filter 36 Ozone decomposition catalyst 37 Medium performance filter 50 Ozone generator

Claims (2)

Air conditioned by the air conditioner is supplied to the air conditioning target space through the air supply duct, and the air exhausted from the air conditioning target space is returned to the air conditioner through the return air duct.
The air filter built in the air conditioner is arranged in close contact with the upstream side of a medium performance filter having a dust collection efficiency of 60% or more by a colorimetric method, and an ozone decomposition catalyst is disposed.
Fungi collected in the medium-performance filter by decomposing ozone contained in the exhaust air from the air-conditioning target space or ozone contained in the outside air with the ozone decomposition catalyst, and active oxygen generated at that time Air conditioning system that inactivates and allergens,
An outside air duct for taking outside air into the air conditioner;
The return air duct is provided with an ozone generator,
The operation of the ozone generator is controlled so that the ozone concentration of the air supplied to the ozone decomposition catalyst becomes a predetermined range and the sterilization performance is stabilized. The ozone generator is operated when the ozone concentration is reduced, and the operation of the ozone generator is controlled so that the ozone concentration of the air supplied to the ozone decomposition catalyst falls within a predetermined range. The air conditioning system according to claim 1.

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