JP2010112718A - Method for measuring temperature distribution in air path - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for measuring a temperature distribution in an air path which measures the temperature distribution in the air path within an air conditioner. <P>SOLUTION: The method for measuring the temperature distribution in the air path which measures the temperature distribution in the air path 3 within the air conditioner 1 has: an occlusion process for occluding an opening 12 provided in an exterior 2 of the air conditioner 1 and opening the middle of the air path 3 by a predetermined member 14 for transmitting infrared rays; and a measurement process for measuring the temperature distribution in the air path 3, based on an energy distribution of the infrared rays transmitted through the predetermined member 14 which is obtained by an infrared camera 15 for capturing an image within the air path 3 through the opening 12. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a temperature distribution measuring method for an air path.

  In buildings such as buildings, air conditioning systems using cold water generated by refrigerators and steam generated by boilers are introduced. Heat exchange between air for air conditioning and cold water or steam is performed by an air conditioner with a built-in heat exchanger.

Heat exchange in the heat exchanger of the air conditioner is performed using a temperature difference. For this reason, if there is variation in the temperature distribution of the air flowing into the heat exchanger, the performance of the heat exchanger is not sufficiently exhibited. Therefore, it is desired to visualize the temperature distribution of the air path in the air conditioner. For example, Patent Document 1 discloses a technique for measuring temperature distribution by guiding infrared rays to an infrared camera with an optical probe. Patent Document 2 discloses a technique for comparing the image data before and after the gas flow, and visualizing the gas flow based on a minute temperature change when the gas flows. Patent Document 3 discloses a technique in which light is applied to an object to uniformly heat the surface of the object, and the flow of fluid flowing on the surface of the object is measured by the distribution of the surface temperature of the object.
JP 2005-337739 A JP 7-225156 A Japanese Patent Publication No. 5-47069

  When the infrared camera cannot be installed inside the air conditioner, the inside is photographed from the opening. However, when the air path in the air conditioner communicates with the outside, the air flow changes, and the temperature distribution of the air path in the apparatus cannot be measured correctly. This invention is made | formed in view of the problem which concerns, and makes it a subject to provide the temperature distribution measuring method which makes it possible to measure the temperature distribution of the air path | route in air-conditioning equipment.

  In order to solve the above-mentioned problems, the present invention closes an opening provided in an exterior part of an air conditioner with a material that can transmit infrared rays, and measures the temperature distribution of the air path by the energy distribution of infrared rays that have passed through the openings. .

  Specifically, it is a temperature distribution measurement method for measuring the temperature distribution of an air path inside an air conditioner, and is provided in an exterior portion of the air conditioner, and an opening that opens in the middle of the air path is made infrared. The temperature distribution of the air path is determined based on the blockage step of blocking with a predetermined member that can be transmitted and the energy distribution of infrared light transmitted through the predetermined member obtained by an infrared camera that images the inside of the air path from the opening. And a measuring step for measuring.

  The temperature distribution measuring method for the air conditioner measures the temperature distribution of the air path inside the air conditioner. Such a temperature distribution measuring method exhibits its effect significantly by being applied to an air path in which the temperature distribution is a problem. Examples of such an air path include a path where two or more kinds of air having different temperatures are mixed.

The air path is basically closed from the space around the air path to guide the air. This is because if there is an opening in the middle, the air leaks and the air cannot be guided properly. However, when the temperature distribution in the air path closed from the surrounding space is captured by an infrared camera, the air path is inevitably opened in the air path. Therefore, in the above temperature distribution measuring method, the opening that makes the inside of the air path visible is closed with a predetermined member that can transmit infrared rays and block the flow of air. As a result, air in the air path does not leak from the opening. Note that the predetermined member is any member that can transmit infrared rays and can prevent air from flowing through the opening, and examples thereof include a film formed of high-density polyethylene. High-density polyethylene can transmit infrared rays, is inexpensive, and has excellent mechanical strength. Therefore, it can be suitably used as a predetermined member.

  In the temperature distribution measuring method, the temperature distribution of the air path is measured by an infrared camera that takes an image of the inside of the air path from the opening blocked by the predetermined member. Since the predetermined member is capable of transmitting infrared light, the infrared light transmitted through the predetermined member is scanned to grasp the energy distribution, and the temperature distribution of the air path can be caught by converting the energy intensity of the infrared light into the temperature. .

  The predetermined member has an energy distribution such that the energy distribution of the infrared light transmitted through the predetermined member is such that the airflow in the air path is clarified by the temperature distribution measured based on the energy distribution. In addition, the thickness of the predetermined member may be set. By setting the thickness of the predetermined member in this way, the airflow in the air path can be captured by the measured temperature distribution of the air path.

  The air conditioner may be one in which air from two or more paths merges in the air path, and the merged air passes through a heat exchanger in the air path. If the air path is such that two or more kinds of air are mixed, the temperature distribution is likely to vary in the air path, so that the effect of the present invention can be exhibited significantly.

  The air conditioner may have an air filter on the upstream side of the heat exchanger in the air path, and the infrared camera may take an image of the air filter in the air path. Since the amount of heat that the solid can hold is greater than that of the gas, when both are at the same temperature, the infrared rays emitted from the solid are stronger than the infrared rays emitted from the gas. Therefore, the energy distribution of infrared rays measured by the infrared camera is due to infrared rays from the surface of the structure constituting the inner wall of the air path. Here, in order to accurately grasp the flow of air flowing through the air path, the air filter in the air path is photographed with an infrared camera. Since the temperature of the air that passes through the air filter is proportional to the infrared energy emitted from the surface of the air filter, how the air flows in the air path by measuring the temperature distribution on the surface of the air filter It becomes possible to grasp more accurately.

  It is possible to provide a temperature distribution measurement method that enables measurement of the temperature distribution of the air path in the air conditioner.

  Hereinafter, embodiments of the present invention will be exemplarily described. Embodiment shown below is an illustration and this invention is not limited to these.

  In this embodiment, the temperature distribution in the mixing chamber, which is an air conditioner that mixes two types of air flowing from two paths, is measured. FIG. 1 is a configuration diagram of a mixing chamber 1 to which the present embodiment is applied. As shown in FIG. 1, the mixing chamber 1 has an exterior portion composed of a housing 2 having a rectangular parallelepiped outer shape.

The housing 2 has an air path 3 that is an internal space through which air flows, and constitutes an exterior portion of the mixing chamber 1. The casing 2 has an outside air duct 4 and a return air duct 5 connected to one end in the longitudinal direction, and an air supply duct 6 connected to the other end. The outside air duct 4 is connected to the outside and introduces outside air into the air path 3. The return air duct 5 is connected to an air-conditioning room (not shown), and introduces indoor air into the air path 3. The air supply duct 6 is connected to a room to be air-conditioned, and supplies air after heat exchange for air conditioning in the air path 3 to the room. That is, air flowing from the outside air duct 4 and the return air duct 5 to the air supply duct 6 passes through the air path 3 of the housing 2. In the air path 3 of the housing 2, an air filter 7, a heating coil 8, a cooling coil 10, a humidifier 9, from the outside air duct 4 and the return air duct 5 side toward the air supply duct 6 side, And the air blower 11 is arrange | positioned in order. In addition, the casing 2 is provided with an inspection port 12 (corresponding to an opening in the present invention) that allows a part of the air path 3 to be visually recognized. The inspection port 12 is provided with a door 13 and is normally closed.

  The air filter 7 is a filter provided to prevent the heating coil 8 and the cooling coil 10 from being contaminated by dust in the air flowing from the outside air duct 4 and the return air duct 5. The air flowing through the outside air duct 4 and the return air duct 5 merges before the air filter 7.

  The heating coil 8 is a heating coil with fins in which steam from a boiler (not shown) flows in the coil, and performs heat exchange between air flowing from the upstream side and steam. The heating coil 8 is provided with a drain trap (not shown), and the condensate in the coil is collected in the water supply system of the boiler.

  The humidifier 9 includes a pipe through which a part of the steam supplied to the heating coil 8 flows and a nozzle that injects the steam flowing through the pipe into the housing 2, and humidifies the air passing through the humidifier 9. To do. Note that steam is passed through the heating coil 8 and the humidifier 9 in winter when the outside air temperature is low.

  The cooling coil 10 is a finned cooling coil in which cold water from a refrigerator (not shown) flows in the coil, and performs heat exchange between air flowing from the upstream side and steam.

  FIG. 2 is a process flow diagram of an air path temperature distribution measuring method (hereinafter simply referred to as a measuring method) according to an embodiment of the present invention. As shown in FIG. 2, the measurement method according to the present embodiment includes a closing step (S101) and a measurement step (S102). Hereinafter, the measurement method according to the present embodiment will be described with reference to the processing flowchart of FIG.

  This measurement method starts by first closing the inspection port 12 with an infrared transparent film (S101). That is, the door 13 is opened (see FIG. 3), and the inspection port 12 is closed with a film 14 (corresponding to a predetermined member in the present invention) (see FIG. 4). The film 14 that closes the inspection port 12 is a high-density polyethylene film manufactured by a so-called low-pressure method or medium-pressure method, and has a mid-infrared wavelength of about 2.5 to 4.0 μm or a far-infrared wavelength of about 8 to 14 μm. In the wavelength region, the absorption of infrared rays is very small. Note that the thickness of the film 14 is extremely thin so that the temperature distribution in the air path 3 is clearly measured to such an extent that the state of the airflow in the air path 3 becomes clear. That is, the resolution of the temperature distribution that is attenuated by the attenuation of infrared energy when passing through the film 14 is set to a resolution that can distinguish at least the air from the outside air duct 4 and the air from the return air duct 5. . Specifically, the resolution of the temperature distribution in the air path 3 measured by an infrared camera described later is such that the temperature difference between the air in the outside air duct 4 and the air in the return air duct 5 can be determined. To. For example, when the air in the outside air duct 4 is about 28 ° C. and the temperature of the air in the return air duct 5 is about 25 ° C., the resolution of the temperature distribution in the air path 3 measured by the infrared camera is higher than 3 ° C. The thickness of the film 14 is set so that a fine temperature difference can be measured. However, a thickness that can withstand the pressure difference between the air path 3 and the periphery of the housing 2 is ensured.

The high-density polyethylene is a synthetic resin in which ethylene is linearly bonded without branching, and is also referred to as hard polyethylene due to its hard property or medium-low pressure method polyethylene due to its production method. High density polyethylene is produced by radical polymerization of ethylene obtained by pyrolyzing naphtha based on petroleum. Polymerization includes a low pressure method in which ethylene is blown into a solvent while applying a pressure of about atmospheric pressure or several atmospheres, and an intermediate pressure method in which ethylene is polymerized in an environment of several tens to several tens of atmospheres. High density polyethylene has a specific gravity of about 0.95 and is excellent in tensile strength and impact strength. Regarding heat resistance, it is possible to maintain the mechanical strength from a low temperature environment of -80 ° C to a high temperature environment of about + 110 ° C.

  Next, an infrared camera 15 is installed in front of the inspection port 12 (see FIG. 5). The direction of the infrared camera 15 is a position where the inside of the inspection port 12 can be seen, and is installed so as to reflect the surface of the air filter 7 arranged in the air path 3. And the infrared camera 15 is operated and the temperature distribution of the air path 3 is measured (S102). Thereby, the temperature distribution of the air path 3 is known, and the state of the air flow in the path can be grasped. The infrared camera 15 does not shoot infrared rays by itself and capture reflections from the object, but passively captures and shoots infrared rays emitted by the object with its own heat.

  FIG. 6 is a temperature distribution in the air path 3 taken by the infrared camera 15. As shown in FIG. 6, the infrared camera 15 measures the temperature distribution on the surface of the air filter 7 and its peripheral portion. As is apparent from the temperature distribution of FIG. 6, the upper temperature of the surface of the air filter 7 is higher than the lower temperature. Therefore, it can be seen from this temperature distribution that the air from the outside air duct 4 and the air from the return air duct 5 that merge together on the upstream side of the air filter 7 pass through the air filter 7 without being sufficiently mixed. . That is, even if the air flowing from the two paths merges in the housing 2, the air does not sufficiently mix, the air from the return air duct 5 flows on the upper side in the air path 3, and the lower side in the air path 3 It can be seen that the air from the outside air duct 4 is flowing.

  As the flow of air in the mixing chamber 1 can be determined by the measurement method according to the present embodiment, the following can be understood. That is, it can be seen that the air from the outside air duct 4 and the air from the return air duct 5 pass through the cooling coil 10 and the heating coil 8 without being sufficiently mixed. Therefore, it can be understood that there is a portion where the temperature difference between the cold water flowing through the cooling coil 10 or the steam flowing through the heating coil 8 and the air flowing through the air path 3 is small. According to the measurement method according to the present embodiment, it becomes possible to grasp the temperature distribution inside the air conditioner such as the mixing chamber 1 so that the performance of the heat exchanger is not sufficiently exhibited. It becomes possible and measures such as necessary improvement measures can be taken. For example, in the case of the mixing chamber 1, the air from the outside air duct 4 and the air from the return air duct 5 are sufficiently mixed by arranging a number of baffle plates upstream of the air filter 7. Thus, the efficiency of the cooling coil 10 and the heating coil 8 can be increased.

  In the above embodiment, the temperature distribution obtained by measuring the air flow in the mixing chamber 1 is grasped. However, the present invention is not limited to such an embodiment. The measurement method according to the present invention measures, for example, the temperature distribution in a chamber in which only one of the cooling coil and the heating coil is arranged, and other temperature distributions in all flow paths in which plural types of air having different temperatures are mixed. It is possible to apply to

The block diagram of a mixing chamber. The processing flow figure of the temperature distribution measurement method of an air path. The figure which shows the mixing chamber before the inspection port is closed with a film. The figure which shows the mixing chamber after the inspection port is obstruct | occluded with the film. The figure which shows the measurement state by an infrared camera. The figure which shows the temperature distribution in the air path | route which the infrared camera image | photographed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mixing chamber 2 ... Housing 3 ... Air path 12 ... Inspection port 14 ... Film 15 ... Infrared camera

Claims (5)

A temperature distribution measuring method for measuring a temperature distribution in an air path inside an air conditioner,
A blocking step that is provided in an exterior part of the air conditioner and that closes an opening that opens in the middle of the air path with a predetermined member that can transmit infrared rays;
A measurement step of measuring a temperature distribution of the air path based on an energy distribution of infrared light transmitted through the predetermined member obtained by an infrared camera that images the air path from the opening.
Temperature distribution measurement method for air path. The predetermined member has an energy distribution such that the energy distribution of the infrared light transmitted through the predetermined member is such that the airflow in the air path is clarified by the temperature distribution measured based on the energy distribution. The thickness of the predetermined member is set,
The temperature distribution measuring method of the air path according to claim 1. The predetermined member is a film formed of high-density polyethylene,
The temperature distribution measuring method of the air path according to claim 1 or 2. In the air conditioner, air from two or more paths merges in the air path, and the merged air passes through a heat exchanger in the air path.
The method for measuring a temperature distribution in an air path according to any one of claims 1 to 3. The air conditioner has an air filter on the upstream side of the heat exchanger in the air path,
The infrared camera images the air filter in the air path;
The temperature distribution measuring method of the air path according to claim 4.

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