JP2016008798A - Chemical substance diffusion test chamber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep a degree of cleanliness of supplied gas supplied to a measuring chamber at a prescribed value suitable for a measuring condition even if a concentration of harmful substance is high when the harmful substance such as VOC diffused from an object item stored in the measuring chamber is measured.SOLUTION: Return gas RA1 flowed from a measuring chamber 4 storing an object item 5 is mixed with return gas RA2 flowed from a preparing chamber 2 through a first return gas duct 8, thereafter the return gas RA1 is guided to an inlet side of an air conditioner 41 for the preparing chamber. Return gas RA3 flowed from the preparing chamber 2 is mixed with the conditioned air flowed from a circulation duct 38, thereafter it is guided to the inlet side of an air conditioner 11 for the measuring chamber 2. Measurement of harmful substance diffused from the object item 5 contained in the return gas RA1 flowed from the measuring chamber 4 is carried out through a measuring port 31 of a closed system arranged at the first return gas duct 8 at the preparing chamber 2.

Description

  The present invention relates to a radiation test chamber for chemical substances such as VOC (Volatile Organic Compounds) that are harmful to human bodies and harmful substances such as ozone.

  For example, VOCs may be generated from building materials, OA equipment such as copiers and printers depending on the materials used, and it is necessary to measure the amount of VOC emitted from these building materials and OA equipment in advance.

  As a technique already proposed for this purpose, there is an experimental apparatus for measuring the amount of chemical substance diffused (Patent Document 1). The experimental apparatus includes an experimental room that includes an air introduction part and an air outlet part, and accommodates a measurement object; and a measurement room that surrounds the laboratory and communicates with the laboratory through the air outlet part. A measurement chamber air purification device that includes a variable air volume fan, a chemical filter, and a dust removal filter and communicates with an intake portion and an exhaust portion provided in the measurement chamber; and the measurement chamber air purification device separately. A temperature / humidity control air conditioner provided with a cooling coil, a hot water coil, a humidifier, a fan, and a dust removal filter, and communicated via an intake unit and an exhaust unit provided in the measurement chamber; a cooling coil; A laboratory air conditioner that communicates via an air inlet section of the laboratory and an air intake section provided in the measurement chamber, the air outlet section The air derivation Those that are configured to be able to place a collection port for collecting a portion of the air discharged from.

Japanese Patent No. 4291008

  In the above-described prior art, a part of the air discharged through the air derivation unit is collected from the laboratory where the device to be measured is placed, and predetermined measurement is performed in the measurement chamber. The return air from the laboratory is once opened to the measurement room. Then, after the return air from the measurement room is taken into the laboratory air conditioner and processed, it is introduced into the laboratory as supply air.

Therefore, the VOC from the measurement target device is diffused into the measurement room. In particular, when measuring VOC from a device with a large amount of VOC emission, the VOC concentration in the return air from the measurement room increases, and the measurement room Even if the return air is taken in and processed by the laboratory air conditioner, the VOC concentration at the outlet of the laboratory air conditioner increases, and the cleanliness of the supply air supplied to the laboratory is a predetermined value that meets the measurement conditions. Could not be maintained.
In order to solve this problem, for example, by adopting the all-out air method (exhaust from the lab, exhaust and replace it with fresh outside air), the temperature control energy, operating costs, and gaseous impurities contained in the outside air There is a problem that the operation cost and the maintenance cost are accompanied by the removal of the water.

  The present invention has been made in view of the above points, and is a flow path for returning air from a room in which building materials to be measured, OA equipment, and the like that emit VOCs are accommodated, and air conditioning that supplies clean air to the room. The purpose is to solve the above problem by devising the inlet air of the machine.

In order to achieve the above object, the present invention is a test chamber used when measuring harmful substances released from an object, and is used in the measurement room in which the object is accommodated and the measurement. A preparation room in which a measuring device is installed; a first air conditioner that supplies conditioned air to the measurement room; and a second air conditioner that supplies conditioned air to the preparation room;
The return air from the measurement chamber containing the harmful substances is mixed with the return air from the preparation chamber through a return air duct and then introduced to the inlet side of the second air conditioner. The air is introduced to the inlet side of the first air conditioner, and the measurement of the harmful substance based on the return air from the measurement chamber is performed in a closed system provided in the return air duct in the preparation chamber. It is characterized by being performed through a measurement port.

  According to the present invention, the measurement of the concentration, emission amount, type, and the like of the harmful substance performed based on the return air from the measurement chamber is performed through a closed measurement port provided in the return air duct in the preparation chamber. In addition, since the return air from the preparation room is introduced to the inlet side of the first air conditioner that supplies conditioned air to the measurement room, the concentration of harmful substances diffused from the object is high. Even if the amount of emission is large, the concentration and the amount of emission of harmful substances in the conditioned air supplied from the first air conditioner can more easily and easily meet the predetermined conditions for measurement. ing.

  Here, the closed measurement port refers to, for example, the air flowing through the duct from the side (circumferential surface) of the return air duct and introduces it into a measurement instrument (for example, a known VOC measurement instrument or chemical substance measurement instrument) as a sampling sample. It is a port that is configured to prevent air inside the duct from leaking out of the port.

  In this case, a damper that adjusts a differential pressure between the measurement chamber and the preparation chamber may be provided on the upstream side of the return air duct where the return air is mixed with the return air from the preparation chamber. By adjusting the differential pressure between the measurement chamber and the preparation chamber in this way, the measurement chamber and the preparation chamber are always adjacent to each other across the panel by adjusting the chamber pressure in the measurement chamber higher than the chamber pressure in the preparation chamber. Even in this case, harmful substances and pollutants in the preparation chamber can be prevented from entering the measurement chamber.

  Furthermore, mixed air of return air from the preparation room and conditioned air on the outlet side of the first air conditioner may be introduced to the inlet side of the first air conditioner. As a result, conditioned air having a more stable cleanliness can be supplied to the measurement chamber.

  According to the present invention, the concentration of harmful substances in the conditioned air supplied from the first air conditioner to the measurement chamber, even if the concentration of harmful substances released from the object is high or the amount of emission is large, It is easier and easier than ever to satisfy the predetermined condition for measurement, and the amount of radiation can be measured stably. Therefore, it is possible to maintain the cleanliness of the supply air supplied to the measurement chamber at a predetermined value that meets the measurement conditions.

It is explanatory drawing which showed typically the outline | summary of the chemical substance emission test chamber concerning embodiment.

  FIG. 1 shows an outline of a chemical substance emission test chamber 1 according to an embodiment. The chemical substance emission test room 1 includes a preparation room 2 in which measuring devices and the like are installed, and the preparation room 2. And a measurement chamber 4 defined by a panel 3 or the like. An object 5 that emits a VOC or the like to be measured is accommodated in the measurement chamber 4.

  For the measurement chamber 4, conditioned air whose temperature and humidity and cleanliness are adjusted to predetermined values from the measurement chamber air conditioner 11 is supplied from the supply port 22 provided in the ceiling of the measurement chamber 4. Supplied as That is, this air conditioner 11 has a cold water coil 12, a hot water coil 13, a humidifier 14, a fan 15, an ozone removal filter 16, a VOC removal filter 17, and a high performance filter 18 in this order from the entrance side. Air-conditioned air from the outlet side is supplied to the air supply port 22 of the measurement chamber 4 via the first air supply duct 21. The first air supply duct 21 is provided with a flow meter 21a and a variable damper 21b.

  In the measurement chamber 4, a baffle plate 6 having a large number of vent holes made of, for example, punching metal is provided between the air inlet 22 and the object 5. With this baffle plate 6, the supply air SA <b> 1 from the supply port 22 becomes a uniform air flow and is supplied to the object 5 in the measurement chamber 4. The baffle plate 6 may be of a specification that forms a uniform air flow with a large number of vents and does not cause an upward backflow. In addition, the baffle plate 6 may be disposed on the downstream side in the blowing direction of the air supply SA1 from the air supply port 22, and when the air supply port 22 is set on the side surface or the floor surface, the baffle plate 6 is set accordingly. You can change the installation location. The area of the baffle plate 6 may be about 8 to 10 times that of the air supply port 22, and for example, it is not necessary to completely partition the measurement chamber 4 in the horizontal direction or the vertical direction.

  The supply air SA1 supplied to the measurement chamber 4 contains, for example, VOC generated from the object, and is supplied from the exhaust section 7 of the measurement chamber 4 to the first return air duct, which is a return air duct in the present invention. 8 is discharged as return air RA1. For example, a stainless steel plate is used for the penetration portion of the first return air duct 8 in the panel 3, and the gap portion is subjected to a caulking process, so that an extremely high hermetic process is performed.

  The first return air duct 8 is once constructed on, for example, a side surface of the preparation chamber 2 via the inside of the preparation chamber 2 (in FIG. 1, it is drawn under the floor for the convenience of illustration). A measurement port 31 is provided in a section located in the preparation chamber 2 in the first return air duct 8. The measurement port 31 is provided with a measurement port 32, and the VOC concentration in the air flowing from the measurement chamber 4 to the first return air duct 8 is measured by a predetermined measurement device (not shown).

  The measuring port 32 is connected to a collection member, a tube, or the like for measurement with a measuring device. Therefore, in order to make the measurement port 31 a closed system, it is necessary to achieve airtightness between a penetrating member for sampling (for example, a bushing) inserted into the first return air duct 8 and a penetrating portion of the duct. .

  In this regard, for example, the following means can be proposed. For example, a penetrating member such as a bushing is employed in a portion penetrating from the side of the duct, and the penetrating member and the duct are welded. Furthermore, the penetration member and the connection port 32 are connected via a screw connector and a socket. On the other hand, when a soft tube is used as a pipe to be introduced to the measuring instrument side, a socket or the like is attached to one end of the soft tube, and this socket is performed using the connection port and a screw connector.

  On the other hand, when the joint is provided in the 1st return air duct 8 exposed in the preparation chamber 2, the location concerned is set to screwing through welding or a sealing material. Furthermore, the first return air duct 8 exposed in the preparation chamber 2 is constructed so as to have a minimum length, for example, by providing a through-hole on the nearest wall surface.

  The first return air duct 8 is provided with a variable damper 8a and a motor damper 8b.

  A first return port 33 and a second return port 34 are formed on the side surface of the preparation chamber 2, and the return air from the preparation chamber 2 is returned from the first return port 33. 2 flows to the return air duct 35 (in FIG. 1, for the sake of illustration, both are depicted on the floor and under the floor). The first return air duct 8 is connected to the second return air duct 35. Therefore, the return air RA1 and the return air RA2 flow through the second return air duct 35 and are introduced to the inlet side of the air conditioner 41 dedicated to the preparation room. The second return air duct 35 is provided with a variable damper 35a.

  On the other hand, the return air RA3 flowing out from the second return air port 34 is introduced from the third return air duct 36 through the dehumidifier 37 to the inlet side of the air conditioner 11 for the measurement chamber described above. As the dehumidifying device 37, a known dehumidifying device can be used, but in the present embodiment, a dry dehumidifying device having a dry rotor 37a is employed. A constant air volume unit 36 a is provided on the downstream side of the dehumidifier 37 in the third return air duct 36. In this example, the dehumidifying device 37 is installed. However, when the humidity measured by the target substance is not low, the dehumidifying device 37 does not need to be installed.

  One end of a circulation duct 38 is connected to the first air supply duct 21 provided on the outlet side of the air conditioner 11 for the measurement chamber described above, and the other end of the circulation duct 38 is dehumidified. An upstream side of the device 37 is connected to the third return air duct 36. The circulation duct 38 is provided with a variable damper 38a.

  A first inlet 41a and a second inlet 41b are provided on the inlet side of the preparation room air conditioner 41, and the second return air duct 35 is connected to the first inlet 41a. . An outside air introduction duct 39 is connected to the second introduction port 41b, and an outside air introduction fan 42 compensates for leakage from the preparation chamber 2 (indicated by L in FIG. 1 for convenience).

  The preparation room air conditioner 41 includes a filter 43, a cold water coil 44, a hot water coil 45, a humidifier 46, a fan 47, a medium performance filter 48, and a VOC removal filter 49 in order from the entrance side. Air-conditioned air adjusted to temperature and humidity and cleanliness is supplied to an air supply port 52 provided in a ceiling portion of the preparation chamber 2 through a second air supply duct 51 connected to the outlet side. The conditioned air from is supplied into the preparation chamber 2 as the supply air SA2.

The main part of the chemical substance emission test chamber 1 according to the embodiment is configured as described above. When measuring harmful substances such as VOC from the object 5, an air conditioner 11 dedicated to the measurement room and preparations are provided. The room-specific air conditioner 41 is operated in parallel. As a result, first, in the measurement chamber 4, the supply air SA <b> 1 adjusted to a predetermined cleanliness and temperature / humidity is blown into the room and passes through the baffle plate 6, so that a predetermined wind speed, e.g. The wind speed is about 10 ⁻³ [m / s] and the air is blown into the space where the object 5 is placed. The VOC from the object 5 is contained in the return air RA1, and is discharged from the measurement chamber 4 through the first return air duct 8 from the exhaust part 7.

  The concentration of the VOC flowing through the first return air duct 8 is measured at the measurement port 31. At this time, since the measurement port 31 is a closed system, the return air RA1 is not discharged into the preparation chamber 2.

  The return air RA 1 containing VOC flows from the first return air duct 8 to the second return air duct 35. At this time, since the return air RA2 from the preparation chamber 2 flows in the second return air duct 35, the return air RA1 and the return air RA2 are mixed (so to speak, the return air RA1 is diluted by the return air RA2). And introduced into the entrance side of the air conditioner 41 dedicated to the preparation room.

  In the air conditioner 41 dedicated to the preparation room, the return air RA1 and the return air RA2 and the outside air OA corresponding to the leak are introduced, and the introduced air is adjusted for temperature and humidity, and particle removal by the filter 43 (mainly After removal of particles in the outside air), particle removal by the medium performance filter 48, and VOC removal by the VOC removal filter 49, the supply air SA2 is supplied into the preparation chamber 2 from the air supply port 52.

  On the other hand, the return air RA3 from the second return air port 34 of the preparation room 2 is introduced into the measurement room air conditioner 11 through the third return air duct 36, but the air conditioner flowing in the circulation duct 38 on the way. After being mixed with the conditioned air from the machine 11 and further realized by the dehumidifying device 37, it is introduced to the inlet side of the air conditioner 11. Note that the dehumidifying device 37 is not necessarily required in the present invention, and may be appropriately installed according to the humidity threshold value of the supply air SA1 required in the measurement chamber 4.

  In the air conditioner 11 for the measurement room, harmful substances are introduced by adjusting the temperature and humidity, the ozone removing filter 16, the VOC removing filter 17, and the high performance filter 18 with respect to the introduced return air RA3 and the mixed air of the conditioned air. Is removed, and the conditioned air after such processing is supplied to the measurement chamber 4 from the supply port 22 of the measurement chamber 4 as the supply air SA1.

  As described above, according to the chemical substance emission test chamber 1 according to the embodiment, the return air RA1 subjected to the VOC measurement is once mixed with the return air RA2 in the preparation chamber 2, and then the air conditioner 41 for the preparation chamber. The air is conditioned and supplied to the preparation chamber 2 as the supply air SA2. Then, the return air RA3 from the preparation room 2 is introduced into the air conditioner 11 for the measurement room.

  Therefore, since the return air RA1 is not directly introduced into the air conditioner 11 for the measurement room, even if the VOC concentration in the return air RA1 is high, the supply air SA1 supplied to the measurement room 2 The cleanliness can be maintained, and in such a case, it is possible to prevent a situation in which the VOC concentration of the supply air exceeds a predetermined value as has been conventionally observed. Moreover, the air introduced into the air conditioner 11 for the measurement room is a mixed air of the return air RA3 and the conditioned air having the same cleanliness as the supply air SA flowing through the circulation duct 38. It is possible to stably maintain the VOC concentration below a predetermined condition.

  By the way, in the chemical substance emission test chamber 1 according to the above-described embodiment, the chamber of the measurement chamber 4 is caused by, for example, the clearance of the door installed in the chamber R or the clearance of the panel partitioning the chamber in some cases. It is conceivable that the pressure is lower than the chamber pressure in the preparation chamber 2. If the chamber pressure in the measurement chamber 4 becomes low in this way, contaminants in the preparation chamber 2 may enter the measurement chamber 4 and the measurement accuracy may deteriorate. However, in the present embodiment, the motor damper 8b provided in the first return air duct 8 is operated so that the chamber pressure in the measurement chamber 4 is always higher than the chamber pressure in the preparation chamber 2. The measurement accuracy is not lowered by the cause. This operation can be performed by installing a differential pressure gauge and automatically controlling the motor damper 8b based on the measured value of the differential pressure gauge.

  In the above-described embodiment, an example in which chemical filters such as the VOC removal filter 17 and the VOC removal filter 49 are incorporated in the air conditioners 11 and 41 is shown. However, a chemical filter is incorporated in the air conditioners 11 and 41. Alternatively, the chemical filter may be separated from the air conditioner. In place of the chemical filter, for example, an air washer type chemical substance removing unit may be incorporated in the air conditioner, or such a chemical substance removing unit may be installed in the path.

  In the embodiment described above, the control by the motor damper 8b is shown as means for adjusting the pressure (differential pressure) between the measurement chamber 4 and the preparation chamber 2, but this is controlled by the fan 15 or 47. May be. For example, in a facility where the amount of air supplied to the measurement chamber 4 is set, it can be dealt with by reducing the rotational speed of the fan 47 when the pressure on the measurement chamber 4 side becomes lower than the set value. Furthermore, the motor damper 8b may be a three-way damper that also serves as the variable damper 35a. Furthermore, the motor damper 8b can also be used as the variable damper 8a.

  The present invention is useful when measuring VOC, ozone, and other chemical substances harmful to the human body emitted from building materials, OA equipment such as copiers and printers.

DESCRIPTION OF SYMBOLS 1 Chemical substance release test room 2 Preparation room 3 Panel 4 Measurement room 5 Object 6 Baffle board 7 Exhaust part 8 1st return air duct 11 Air conditioner 21 1st air supply duct 22, 52 Air supply port 31 Measurement port 32 Background Measuring port 33 First return air port 34 Second return air port 35 Second return air duct 36 Third return air duct 38 Circulation duct 39 Outside air introduction duct 41 Air conditioner 51 Second air supply duct

Claims (3)

A laboratory used to measure harmful substances released from objects,
A measurement chamber in which the object is accommodated;
A preparation room in which measurement equipment used for the measurement is installed;
A first air conditioner for supplying conditioned air to the measurement chamber;
A second air conditioner for supplying conditioned air to the preparation room;
The return air from the measurement chamber containing the harmful substance is introduced to the inlet side of the second air conditioner after being mixed with the return air from the preparation chamber through a return air duct,
Return air from the preparation room is introduced to the inlet side of the first air conditioner,
The chemical emission test chamber, wherein the measurement of the harmful substance based on the return air from the measurement chamber is performed through a closed measurement port provided in the return air duct in the preparation chamber. The damper for adjusting the differential pressure between the measurement chamber and the preparation chamber is provided on the upstream side of the return air duct where the return air mixes with the return air from the preparation chamber. Item 2. A chemical emission test chamber according to Item 1. The mixed air of return air from the preparation room and conditioned air on the outlet side of the first air conditioner is introduced to the inlet side of the first air conditioner. Also, the chemical emission test chamber according to any one of 2 above.

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