JP2002061902A - Wet film coil and wet film forming apparatus for coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wet film forming apparatus with improved collection effect by forming the wet film on the surface of a plate fin of a coil. SOLUTION: A coil 3 includes its plate fin 30 with many long holes 31 horizontally. On the coil 3, a mat 60 comprising a water absorbing or water retention material is arranged, and a water feed tube 70 is provided on the mat 60 for dropping water. Water that is fed from the water feed tube 70 to the plate fin 30 through the mat 60 and thereafter drops is recovered in a water tank disposed at a lower portion. Piping is connected such that a part of the water is drained and another part is supplied in circulation to the water feed tube by a pump together with replenishing water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet film coil having a wet film formed on a surface of a plate fin provided on the coil.
And a device for forming a wet film on the coil.

[0002]

2. Description of the Related Art In factories in the electronics and precision machinery industries, storage rooms for food preservation, animal breeding rooms for experiments, biological clean rooms, and the like, the indoor environment such as the temperature, humidity, and cleanliness of indoor air is controlled. An air conditioner that adjusts the processing to a state that meets the purpose of the above is indispensable. This air conditioner mainly includes a coil for heating and cooling air, a humidifier for humidifying, an air filter for cleaning, and a blower.

In recent years, in factories that manufacture semiconductors, liquid crystals, hard disks, and the like, factors that affect the quality and yield of products include not only fine particles in the air but also gaseous pollutants (hereinafter referred to as chemical gases). ) Is at issue. Such chemical gases include:
For example, there is an acidic gas such as hydrogen fluoride or hydrogen chloride.

However, such a chemical gas is HEPA.
(High efficiencyparticula
te air) filter and ULPA (ultra low
Since it is difficult to cope with a filter having a high particle collection rate, such as a filter (wpenetration air), special measures need to be taken.

At present, as a method for removing a chemical gas, there are a dry method for removing by using various filters called a chemical air filter and a wet method for absorbing and removing gas by contact with a liquid. The dry method is
The type of chemical air filter, the processing method, and the type of chemical substance attached to the filter differ depending on the type of chemical gas. Examples of such a filter include a granular, fibrous, or honeycomb structure using activated carbon or activated carbon impregnated with various chemicals, a filter in which bead activated carbon is supported on a resin foam having a filament structure, and an ion exchange function. There are resin filter media and the like.

[0006] On the other hand, in the wet method, chemical gas in the air is removed by spraying liquid droplets or supplying a liquid substance to a filler having a high porosity and a large surface area. Examples of such a wet method include a method in which pressurized water is directly sprayed during ventilation using an air washer, a method in which water having a fine particle diameter is sprayed on a water-absorbing material, and a porous film of PTFE (polytetrafluoroethylene). And a diffusion scrubber method in which gas is absorbed into pure water through the air. As a conventional humidification method for performing high-precision humidity control, steam humidification is generally used. However, a method of performing proportional control using a hydrophilic water film has been devised.

[0007]

However, the above-described method for removing a chemical gas has the following problems. That is, the dry method using the chemical air filter is expensive and has a short life. In addition, since it is difficult to predict the life, it is necessary to replace the battery in about six months to one year, and the running cost is high. In addition to the labor for such replacement work, it is difficult to reuse, so that it takes time to dispose as industrial waste. In addition, the initial removal performance continuously decreases. And the blowing resistance (pressure loss) is large,
The blowing cost increases. In addition, the chemical additives to the filter itself can be a source of indoor contamination.

On the other hand, in the case of the wet method, basically, increasing the gas-liquid contact area leads to high removal ability. For this reason, when an air washer is used, as a means for increasing the surface area on the water side, a reduction in the spray particle diameter or an increase in the spray water amount is performed. But,
These require a large spray water pressure or a large spray water amount, which increases running costs. Also,
Even in the case of spraying water onto the water-absorbent material, the pressure loss is large because the water-absorbent material is folded plate-shaped to prevent carryover of spray water, and more water droplets are collected on the upstream side On the downstream side, there is a problem that the concentrated gas is hardly moved to the drainage side (there is little movement of water). Further, in the case of the diffusion scrubber method, there is a problem that the porous membrane of PTFE is expensive, and a structure supporting the membrane reduces an effective ventilation area on the air side and increases a pressure loss.

To cope with this, there has been proposed an air conditioner which removes chemical gas by dropping pure water using a vaporizing humidifier having strength and a hydrophilic property in the material itself. According to such an air conditioner, a humidifying module in a commercially available vaporizing humidifier can be used as a humidifying material, so that the initial cost is low. In addition, since it is a drop type rather than a spray type, the water pressure can be low, and since it has high hydrophilicity and large surface area, the gas-liquid contact area can be increased even with a small amount of water, so running costs can be kept low and chemical gas removal. Rate is higher.
Furthermore, by providing the humidifying modules in multiple stages and making them flow in the opposite direction, high efficiency removal can be realized even with a small amount of makeup water.

However, even in such a case, removing the chemical gas from the hydrophilic material in the humidifying module has the following problems. That is, since the hydrophilic material is considered to be hydrophilic first, the strength is difficult for high-pressure cleaning in the case of soiling, and there is a possibility that a chemical may remain during chemical cleaning. . Further, in the intermittent operation, an odor may be generated due to generation of bacteria or the like, and when the operation is stopped, the residual operation is required until the material dries. further,
Since the installation space for the humidification module is required, there is a limit in reducing the required space.

The present invention has been proposed to solve the problems of the prior art using a washer and a humidifying film as described above, and its object is to eliminate the need for using a washer or a humidifying module. It is an object of the present invention to provide a wet film coil which can reduce initial cost and running cost and requires a small space, and an apparatus for forming a wet film on the coil.

[0012]

According to a first aspect of the present invention, there is provided a wet film coil including a tube through which a heat medium circulates, and a plate fin attached to the tube. A wet film is formed on the surface of the plate fin. According to the first aspect of the present invention, the air passing through the wet film coil can contact the wet film by the wet film formed on the surface of the plate fin of the coil.

A wet film coil according to a second aspect of the invention is characterized in that a plurality of holes are formed in the plate fin such that the entire surface of the plate fin is a wet surface covered with a water film. And According to the second aspect of the present invention, a wet film is formed on the entire surface of the plate fin by the plurality of holes formed in the plate fin, and the wet film is held on the fin surface.

A wet film coil according to a third aspect of the present invention is characterized in that the pipe through which the heat medium circulates circulates cold water or hot water as the heat medium. According to the third aspect of the present invention, when hot water is circulated as the heat medium, the coil has a function as a humidifying unit and a chemical gas removing unit by making the coil surface a wet surface. Can be. In addition, when circulating cold water as a heat medium, by lowering the temperature slightly than the saturated air, uniform dew condensation on the surface of the coil plate fins,
By supplying water to the wet plate fins and spreading them over the entire surface, a function as a chemical gas removing means can be provided.

According to a fourth aspect of the present invention, there is provided an apparatus for forming a wet film of a coil, comprising a heat exchange coil for exchanging heat with air by a heat medium, wherein the heat exchange coil comprises a pipe through which a heat medium circulates, And a plate fin attached to the
A water supply pipe for supplying water to the plate fin is provided above the plate fin, and a water film is formed on the surface of the plate fin by water supply from the water supply pipe. According to the fourth aspect of the present invention, since the water supply from the water suction pipe is supplied to the surface of the plate fin, the surface of the plate fin always becomes a wet surface and a wet film is formed.

According to a fifth aspect of the present invention, there is provided a wet film forming apparatus for a coil, wherein:
A water-retentive or water-absorbent mat is provided. According to the fifth aspect of the present invention, since the water-retentive or water-absorbing mat is provided between the water supply pipe and the plate fin, water is uniformly dispersed in the plate fin by the mat. Is done.

According to a sixth aspect of the present invention, in the apparatus for forming a wet film of a coil, the water supply pipe is provided with respect to the plate fin.
It is characterized by supplying water with reduced surface tension. According to the sixth aspect of the present invention, since the water having a reduced surface tension is supplied to the plate fins, the hydrophilicity with the plate fins is improved, and the supply water can be evenly distributed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a wet film coil of the present invention is applied to an air conditioner will be specifically described below with reference to the drawings. [1. First Embodiment] [1-1. Configuration] First, the first embodiment of the present invention will be described.
This will be described with reference to FIGS. That is, in the drawing, a pre-filter 2a and a filter 2, which remove dust from outside air, are heated from the air intake side by a circulating hot water inside a housing 1 having an air intake port on the left side and an air supply port on the right side. A first heating coil 3, a cooling coil 4 for cooling air with circulating cold water, a heating coil 5 for heating air with circulating hot water, and a blower 6 for discharging air outside the housing 1 are provided. As the pre-filter 2a, an air filter for coarse dust that collects relatively large particles is used. As the filter 2, for example, a medium-performance or HEPA filter is used.

The first heating coil 3, the cooling coil 4, the second
Are provided with valves 7, 8, 9 for controlling the flow rates of hot water and cold water, respectively. Further, a dew point temperature sensor 10 for detecting the dew point temperature of the supply air and a dry bulb temperature sensor 11 for detecting the dry bulb temperature of the supply air are attached to the supply port of the humidified air.

As shown in FIG. 2, the first heating coil 3, the cooling coil 4, and the second heating coil 5 are arranged such that a copper rectangular plate fin 30 is provided in an airflow with respect to a meandering copper tube 20. Are fixed by a steel plate frame 40. Headers 50 each having an inlet and an outlet for the heat source water are attached to both ends of the copper tube 20. In addition, cold water and hot water flowing through the first heating coil 3, the cooling coil 4, and the second heating coil 5 are:
The inlet side of each of the cold water and the hot water is set on the leeward side so as to be counter-current to the air flow.

Further, as shown in FIG. 3, the first heating coil 3 has a horizontally long hole 3 formed in a plate fin 30.
Many 1s are formed. As shown in FIG. 4, the holes 31 are alternately arranged so that a space between two horizontally arranged holes 31 is located at the center of the hole 31 thereunder. A mat 60 formed of a water-absorbing or water-retaining material is provided on the first heating coil 3, and a water supply pipe 70 for dropping water on the mat 60.
Is provided. Then, as shown in FIG. 1, water supplied from the water supply pipe 70 to the plate fins 30 via the mat 60 and then dropped is supplied to the water tank 7 arranged at the lower part.
The pipes are connected so that they enter 1 and are partially drained and partially circulated and supplied to a water supply pipe 70 by a pump 72 together with makeup water.

The valves 7, 8 and the dew point temperature sensor 10 are connected to a controller 12. The valves 8 and 9 and the dry-bulb temperature sensor 11 are connected to a controller 13. The controller 12 is configured to control the amount of hot water in the first heating coil 3 based on the dew point temperature detected by the dew point temperature sensor 10. Controller 13
Is configured to control the amount of hot water in the second heating coil 5 based on the dry-bulb temperature detected by the dry-bulb temperature sensor 11. The cooling coils 4 are controlled by controllers 12 and 13 based on the detection values of the dew point temperature sensor 10 and the dry bulb temperature sensor 11. The pump 72 is always operated when performing chemical gas removal, but ON / OFF control is performed based on the detection value of the dew point temperature sensor 10 connected to the controller 13 when performing only humidification. It has a configuration.

[1-2. Action] [1-2-1. At the time of heating and humidification] The operation of the present embodiment having the above-described configuration will be described below, taking as an example a case where heating and humidification of air is required as in winter. In addition,
Aw to Dw and As to Ds shown in FIG. 5 correspond to the state of air at the positions A to D shown in FIG. That is, the blower 6 is operated, the valve 7 of the first heating coil 3 is opened, and the pump 72 is operated. The water sent out by the pump 72 is supplied from the water supply pipe 70 to the mat 60, and is further dropped from the mat 60 onto each plate fin 30.

The water thus dropped is uniformly held on the entire surface of each plate fin 30 by the holes 31. That is, since the hole 31 is long in the horizontal direction, the water that has reached the hole 31 spreads laterally, and it is difficult for the water to fall down due to gravity. Further, since the upper and lower holes 31 are arranged alternately as described above, water falling between the upper holes 31 enters the center of the lower hole 31 and is retained. Therefore, the water is uniformly distributed over the entire plate fin 30. Thereby, the surface of the plate fin 30 becomes a wet surface covered with the water film. On the other hand, the dropped water is collected in a water tank 71 arranged at a lower portion, a part of the water is drained, and a part of the water is supplied to a water supply pipe 7 by a pump 72 together with makeup water.
It is circulated to zero.

The outside air flowing from the air inlet (A point) of the housing 1 is heated by the first heating coil 3 after the dust is filtered through the pre-filter 2a and the filter 2, and as described above. , And is humidified when passing through the plate fin 30 which has become a wet surface (point B). As a result, the dry bulb temperature and the relative humidity change as indicated by the solid line connecting Aw and Bw in FIG. The heated and humidified air is further heated by the second heating coil 5 (point D) and supplied from the supply port by the blower 6. As a result, as shown by the solid line connecting Bw and Dw in FIG. 5, a sensible heat change occurs in which the absolute humidity is constant and the dry bulb temperature rises.

The flow rate of hot water in the first heating coil 3 is detected by a dew point temperature sensor 10 installed at the supply port so that the absolute humidity of the supply air satisfies the indoor temperature and humidity. Based on the dew point temperature value, the controller 12 adjusts the opening degree of the valve 7 by proportional control, and the flow rate of the hot water in the second heating coil 5 is detected by the dry bulb temperature sensor 11 installed at the supply port. The controller 13 adjusts the opening degree of the valve 9 by proportionally controlling the opening degree of the valve 9 based on the dry-bulb temperature value.

When the air passes through the plate fins 30, the moisture on the wet surface is reduced according to the same principle as the removal of the chemical gas using the wet method or the evaporative humidifier shown in the prior art. Absorbs chemical gases.

[1-2-2. Cooling and Dehumidification] Next, a case where cooling and dehumidification of air is required, such as in summer, will be described below. First, the blower 6 is operated, and the valve 8 of the cooling coil 4 is opened. The outside air flowing in from the air inlet (point A) of the housing 1 is subjected to humidification by the first heating coil 3 in the same manner as during winter heating and humidification after dust is filtered through the pre-filter 2a and the filter 2. Chemical gas removal is performed (point B). As a result, the dry bulb temperature and the relative humidity change as indicated by a dashed line connecting As and Bs in FIG. In this case, the valve 7 is closed, and hot water is not supplied to the first heating coil 3.

Thereafter, the air is cooled by the cooling coil 4 (point C) and supplied from the supply port by the blower 6. As a result, the dry-bulb temperature and the relative humidity change as indicated by the dashed line connecting Bs and Cs in FIG. In this case, since the dew condensation water on the surface of the plate fin 30 in the cooling coil 4 forms a uniform wet surface, a very high chemical gas removal performance can be obtained.

The flow rate of the chilled water in the cooling coil 4 is determined based on the dew-point temperature sensor 10 and the dry-bulb temperature sensor 11 installed at the supply port so that the absolute humidity of the supplied air satisfies the indoor temperature and humidity. The controller 12 and 13 are adjusted by proportionally controlling the opening of the valve 8. If further heating is required in relation to the room temperature, the valve 9 is opened and heating is performed by the second heating coil 5 in the same manner as described above (point D). As a result, a sensible heat change occurs in which the absolute humidity is constant and the dry-bulb temperature rises, as shown by the dashed line connecting Cs and Ds in FIG.

In the middle season other than winter and summer, the dew point temperature sensor 1 is adjusted according to the outside air and the indoor set temperature.
The flow rate control of the first heating coil 3 and the cooling coil 4 based on the detected value of 0, the flow rate control of the cooling coil 4 based on the detected value of the dry bulb temperature sensor 11, and the flow rate control of the second heating coil 5 are performed.

[1-3. Effect] According to the present embodiment as described above, humidification and absorption of chemical gas can be performed by making the metal plate fin 30 a wet surface covered with a water film. There is no change and continuous supply of water makes it possible to absorb chemical gas without deterioration in life. Also, metal plate fins 3
For 0, cleaning can be easily performed by high-pressure cleaning, and even in the case of chemical cleaning, residual chemicals can be easily removed.

Since the humidifier and the gas absorbing device are also used, space saving and cost reduction can be realized.
In particular, the hole 31 is formed in the plate fin 30 without separately providing a humidifier or a gas absorbing device, and the water supply pipe 70 and the mat 60 are provided.
, The initial cost can be greatly reduced. Further, since the supply of water is of a dropping type, a high water pressure is not required, and since the surface area of the plate fin 30 is large and the gas-liquid contact area is large, a large amount of water is not required and running costs can be saved.

Further, since the plate fins 30 are made of metal, the drying operation at the time of stopping can be processed in a very short time. Further, there is no problem of generation of odor at the time of intermittent operation. In particular, since the plate fins 30 are made of copper, high antibacterial properties can be provided. Furthermore, by the plurality of holes 31 formed in the plate fin 30,
Since the supply water can be evenly distributed and a wet surface covered with a water film can be obtained, uniform and stable humidification efficiency and chemical gas absorption efficiency can be obtained. In particular, since the dropping of water on the plate fins 30 is performed through the water-absorbing or water-retaining mat 60, the water is more evenly distributed than in the case where the water is pipetted directly through the water supply pipe 70.

[2. Second Embodiment] [2-1. Configuration] Next, a second embodiment of the present invention will be described.
This will be described below with reference to FIGS. That is, in the present embodiment, the cooling coil 4 has a large number of holes 31 formed in the plate fin 30 similarly to the first heating coil 3 in the first embodiment, and the mat 60
Is configured to be able to supply water from the water supply pipe 70 via the. The water tank 71 also covers the lower part of the cooling coil 4. The other configuration is the same as that of the first embodiment.

[2-2. Operation] The operation and effect of the present embodiment as described above will be described below. Note that A shown in FIG.
w to Dw and As to Ds correspond to the state of air at the positions A to D shown in FIG. That is, when heating and humidification of air is required, as in winter, the blower 6 is operated, the valve 7 of the first heating coil 3 is opened, and the pump 72 is operated. The water sent out by the pump 72 is supplied from the water supply pipe 70 to the mats 60 in the first heating coil 3 and the cooling coil 4, and is further dropped from the mat 60 onto each plate fin 30.

The water dropped in this way spreads over the entire plate fins 30 as in the first embodiment, so that the outside air flowing from the air intake (point A) of the housing 1 is After the dust is filtered through the pre-filter 2a and the filter 2, the dust is heated by the first heating coil 3 and humidified when passing through the plate fin 30 covered with the water film as described above ( B point). As a result, the dry bulb temperature and the relative humidity change as shown by the solid line connecting Aw and Bw in FIG. The heated and humidified air is humidified by the plate fins 30 holding moisture as described above when passing through the cooling coil 4 (C
point). As a result, the dry bulb temperature and the relative humidity change as indicated by the solid line connecting Bw and Cw in FIG.

The air thus humidified further comprises
Is heated by the heating coil 5 (point D) and supplied from the supply port by the blower 6. Thereby, Cw of FIG.
And Dw, the absolute humidity is constant and a sensible heat change occurs in which the dry bulb temperature rises. In addition, air
Plate fins 30 for heating coil 3 and cooling coil 4
When passing through, the moisture on the wet surface absorbs the chemical gas. The control when the air needs to be cooled and dehumidified in the summer or the middle season is the same as in the first embodiment.

[2-3. Effect] According to the present embodiment as described above, water is supplied not only to the first heating coil 3 but also to the plate fins 30 in the cooling coil 4 to perform humidification and chemical gas removal. Therefore, the humidification efficiency and the removal efficiency of the chemical gas increase.

[3. Third Embodiment] [3-1. Configuration] A third embodiment of the present invention will be described below with reference to FIG. That is, in the present embodiment,
Only a cold / hot water coil 80 is provided as a heat exchanger that switches between water passages in summer and winter to reduce the size of the housing 1. Then, the cold / hot water coil 80
A number of holes 31 are formed in the plate fin 30 in the same manner as the first heating coil 3 described above, and water is supplied from the water supply pipe 70 via the mat 60. The water that has fallen to the lower portion of the cold / hot water coil 80 is collected in a water tank 71, a part of which is drained, and a part of which is connected to a pipe so as to be circulated and supplied to a water supply pipe 70 by a pump 72 together with makeup water. Have been.

The valve 81 for adjusting the flow rate of the cold / hot water coil 80 is configured to be controlled by a controller (not shown) based on a detection value of a thermostat T provided in the room. Further, the flow rate of the dripping water from the water supply pipe 70 supplied by the pump 72 is configured to be inverter-controlled by a controller (not shown) based on the detection value of the humistat H provided in the room. .

[3-2. According to the present embodiment as described above, when heating and humidification of air is required as in winter, the blower 6 is operated and the coil 80 for both hot and cold water is used.
The valve 81 is opened to supply hot water and the pump 72 is operated. The water sent out by the pump 72 is supplied from the water supply pipe 70 to the mat 60 in the coil 80 for both hot and cold water, and further dropped from the mat 60 onto each plate fin 30.

The water dropped in this way spreads over the entire plate fins 30 in the same manner as in the first embodiment, so that the outside air flowing in from the air intake of the housing 1 is cooled by the cold / hot water coil 80. And is humidified when passing through the plate fins 30. As a result, the dry bulb temperature and the relative humidity increase. The control when the air needs to be cooled and dehumidified in the summer or the middle season is the same as in the first embodiment.

In the present embodiment, since the heat exchanger is a single coil 80 for both cold and hot water, the size can be reduced as compared with the case where a plurality of heat exchangers are provided, and the installation space is greatly increased. Can be reduced. In addition, the control of the amount of water dropped from the water supply pipe 70 is performed by connecting a plurality of pipes for supplying water to the water supply pipe 70, controlling the opening and closing of solenoid valves provided for each of the pipes, and installing a plurality of pumps 72. Each ON,
It can also be performed by a method of controlling OFF.

[4. Other Embodiments] The present invention is not limited to the above embodiments. That is,
In the case of an air conditioner mainly for the purpose of humidification, the wettability of the plate fins is not so required, and the plate fins do not necessarily need to be specially processed. For example,
An air conditioner similar to that of the above-described first embodiment can be configured except that holes are not formed in the plate fins. An example of temperature and humidity control in such a case is shown by a dotted line in FIG. 5 shown in FIG. 5 corresponds to the state of air at the position shown in FIG.

According to this embodiment, the water supplied from the water supply pipe 70 to the mat 60 further
Is dropped on each plate fin 30 and drops along each plate fin 30. The outside air flowing from the air inlet (point) of the housing 1 is supplied to the pre-filter 2a.
Then, after the dust is filtered through the filter 2, the dust is heated by the first heating coil 3 and humidified when passing between the water drops falling along the plate fins 30 as described above (dots). ). As a result, the dry bulb temperature and the relative humidity change as indicated by the dotted line connecting to FIG. The heated and humidified air is further heated (point) by the second heating coil 5 and supplied from the supply port by the blower 6. As a result, a sensible heat change occurs in which the absolute humidity is constant and the dry-bulb temperature rises, as indicated by the dotted line connecting to FIG.

Further, an air conditioner similar to that of the above-described second embodiment can be formed except that no holes are formed in the plate fins. An example of temperature and humidity control in such a case is shown by a dotted line in FIG. In addition, shown in FIG.
Corresponds to the state of air at the positions indicated by 〜 in FIG.

According to this embodiment, the water supplied from the water supply pipe 70 to the mat 60 further
Is dropped on each plate fin 30 in the heating coil 3 and the cooling coil 4 and falls along each plate fin 30. And the air inlet (point) of the housing 1
Outside air flowing from the pre-filter 2a and the filter 2
After the dust is filtered through the fins, the dust is heated by the first heating coil 3 and humidified when passing between the water drops falling along the plate fins 30 as described above (dots). As a result, the dry bulb temperature and the relative humidity change as indicated by the dotted line connecting to FIG.

When the heated and humidified air passes through the cooling coil 4, it is humidified by the water drops falling along the plate fins 30 as described above (dots). As a result, the dry-bulb temperature and the relative humidity change as indicated by the dotted line connecting to FIG. The air thus humidified is further heated by the second heating coil 5 (
Point), and is supplied from the supply port by the blower 6. As a result, a sensible heat change occurs in which the absolute humidity is constant and the dry-bulb temperature rises, as indicated by the dotted line connecting to FIG.

Even when the plate fins are not specially processed, if the inlet air absolute humidity in summer is high, dew condensation occurs on the entire cooling coil plate fins in the air conditioner, resulting in a uniform wet surface. Becomes Analysis of the dew water shows that the chemical component concentration is very high, and not only the condensation and condensation of the chemical gas contaminants, but also the absorption of the chemical gas due to the wetting of the plate fin surface occurs. However, since the chemical component concentration of the dew water is very high, it is not enough to absorb the chemical gas only by the dew water, and by further dropping water in this state,
A large absorbing surface uniformly wetted can be obtained, and the absorption efficiency of chemical gas can be improved.

Therefore, a high chemical gas removing effect can be obtained by controlling the same air conditioner as that of the second embodiment except that no holes are formed in the plate fins as follows. Can be. FIG. 9 shows an example of temperature and humidity control in such a case. 9 corresponds to the state of the air at the position indicated by in FIG.

According to this embodiment, the water supplied from the water supply pipe 70 to the mat 60 further
Is dropped on each plate fin 30 in the heating coil 3 and the cooling coil 4. The outside air flowing from the air inlet (point) of the housing 1 is supplied to the pre-filter 2a.
Then, after the dust is filtered through the filter 2, the dust is heated by the first heating coil 3 and humidified when passing between the water drops falling along the plate fins 30 as described above (dots). ). At this time, the humidification amount is increased so that the plate fins 30 of the cooling coil 4 are sufficiently dew-condensed. This allows
The dry-bulb temperature and the relative humidity change as shown by the solid line connecting to and in FIG.

The heated and humidified air is cooled and dehumidified when passing through the cooling coil 4, and the dew is uniformly formed on the entire plate fins 30 to form a uniform wetted surface having a large area. At the same time, since the makeup water is dropped on the plate fins 30, a high chemical gas removal effect can be obtained (dot). As a result, the dry-bulb temperature and the relative humidity change as indicated by the solid line connecting to FIG. After the super-humidification, the air dehumidified by cooling is further subjected to the second
Is heated by the heating coil 5 (point) and supplied from the supply port by the blower 6. As a result, a sensible heat change occurs in which the absolute humidity is constant and the dry-bulb temperature rises, as shown by the solid line connecting to FIG. In the dehumidification period, even if the above-described over-humidification control is not performed, dew condensation occurs uniformly on the plate fins 30 of the cooling coil 4 as a whole. Therefore, a high chemical gas removal effect can be obtained by continuously dropping make-up water in this state.

Further, in order to realize the above-described over-humidification, a configuration as shown in FIG. 10 may be employed. That is, in each of the above embodiments, the run-around coil 90 is disposed before and after the heating coil 3 to constitute an air conditioner that drops pure water on the plate fin. With this configuration, the air passing through the run-around coil 90 and the heating coil 3 can be easily over-humidified to cause dew condensation on the plate fins of the cooling coil 4 and also achieve an energy saving effect.

For example, as a method for imparting hydrophilicity to the plate fin, a method of forming a large number of holes as in the above-described embodiment is suitable in view of durability and cost. The following method is also applicable.
For example, it is conceivable to apply a hydrophilic paint to the plate fins or apply a hydrophilic coating. However, such a method has a possibility of peeling or deterioration. It is also conceivable to irradiate the titanium dioxide with light. However, this method has difficulty in consideration of the interval between the plate fins and the like.

It is also possible to add a surfactant to the water supplied to the plate fins described in the above embodiment, or to use activated water or functional water used for cleaning semiconductors. It is. In such a case, since the surface tension of the water supplied to the plate fins is low, the hydrophilicity with the plate fins is improved, and the supply water is uniformly distributed,
Uniform and stable humidification efficiency and chemical gas absorption efficiency can be obtained. In this case, the plate fins do not need to be specially processed, but by performing the processing for increasing the hydrophilicity described in the above embodiment,
A more uniform wet surface can be obtained, and the humidification efficiency and the absorption efficiency of the chemical gas can be further improved.

The above-mentioned heat exchange coil may be of any type as long as it has a plate fin.
The material of the plate fin is not limited to the above embodiment. For example, aluminum can be used. However, considering antibacterial properties, copper is desirable, and antibacterial properties can be enhanced by impregnating silver ions.

The size, shape, and number of holes formed in the plate fins are not limited to those described in the above embodiments, as long as they can impart hydrophilicity and water retention. The number and shape of plate fins and copper tubes are not limited to those described in the above embodiment. Furthermore, the number of coils for heat exchange can be freely changed at the stage of design, and for example, one having one heating coil and one cooling coil may be provided.

[0059]

As described above, according to the present invention,
It is not necessary to use a dedicated wet film for humidification or chemical gas removal, and by using the plate fins of the cooling or heating coil, initial costs and running costs can be reduced, and a wet film coil with a small required space can be used. Can be provided.

[Brief description of the drawings]

FIG. 1 is a first diagram of an air conditioner to which a wet film coil of the present invention is applied.
FIG. 2 is a configuration diagram showing an embodiment.

FIG. 2 is a perspective view showing a heating coil and a cooling coil in the embodiment of FIG.

FIG. 3 is a perspective view showing an internal configuration of a heating coil in the embodiment of FIG.

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a psychrometric chart showing an example of temperature and humidity control in the embodiment of FIG. 1;

FIG. 6 is a configuration diagram showing a second embodiment to which the wet film coil of the present invention is applied.

FIG. 7 is a psychrometric chart showing an example of temperature and humidity control in the embodiment of FIG. 6;

FIG. 8 is a configuration diagram showing a third embodiment to which the wet film coil of the present invention is applied.

FIG. 9 is a psychrometric chart showing an example of temperature and humidity control according to another embodiment of the present invention.

FIG. 10 is a configuration diagram showing another embodiment of the wet film coil of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Housing 2 ... Filter 2a ... Pre-filter 3 ... 1st heating coil 4 ... Cooling coil 5 ... 2nd heating coil 6 ... Blower 7, 8, 9, 81 ... Valve 10 ... Dew point temperature sensor 11 ... Dry bulb temperature Sensors 12, 13 ... Controller 20 ... Copper tube 30 ... Plate fin 31 ... Hole 40 ... Frame 50 ... Header 60 ... Mat 70 ... Water supply pipe 71 ... Water tank 72 ... Pump 80 ... Cold / hot water combined coil 90 ... Run around coil T ... Thermostat H ... Humidistat

Claims (6)

[Claims] 1. A wet film coil comprising a tube through which a heat medium circulates, and a plate fin attached to the tube, wherein a wet film is formed on the surface of the plate fin. 2. The wet film coil according to claim 1, wherein a plurality of holes are formed in the plate fin such that the entire surface of the plate fin becomes a wet surface covered with a water film. . 3. The wet film coil according to claim 1, wherein the pipe through which the heat medium circulates circulates cold water or hot water as the heat medium. 4. A heat exchange coil for exchanging heat with air by a heat medium, wherein the heat exchange coil has a pipe through which the heat medium circulates, and a plate fin attached to the pipe, A water supply pipe for supplying water to the plate fin is provided on the upper part of the fin, and a wet film is formed on the surface of the plate fin by the water supply from the water supply pipe. apparatus. 5. The coil wet film forming apparatus according to claim 4, wherein a water-retaining or water-absorbing mat is provided between the water supply pipe and the plate fin. 6. The coil wet film forming apparatus according to claim 4, wherein the water supply pipe supplies water with reduced surface tension to the plate fin. .