JP2003343991A - Natural convection type dehumidifying air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make liquid flow at a temperature within a given range for heat exchanging fins of a natural convection type dehumidifying air conditioner and to perform natural convection more smoothly than a conventional method. <P>SOLUTION: This natural convection type dehumidifying air conditioner is provided with a double tube constituted by attaching a bifurcator to an inner side of an outer tube on a flow-in side of liquid, an eddy current device attached to the halfway of the outer tube, and a mixing part. A problem concerning natural convection is solved by providing a suction air interference prevention plate, an escape prevention part for suction air, a side wall of the heat exchange fin, and a diamond-shaped condensed water receiver. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a natural convection type dehumidifying air conditioner having a box shape on the ceiling surface, a heat exchange fin inside, and a heat transfer double tube attached. Air to cool the indoor air to the dew point temperature, and natural convection due to the difference in specific gravity of the air removes the humidity in the indoor air as condensed water, and at the same time cools the air, but the main purpose is dehumidification And belongs to the heat exchanger in the field of air conditioning.

[0002]

2. Description of the Related Art There is a radiant cooling system as a conventional natural convection cooling apparatus, in which pipes are arranged in a coil shape on a ceiling surface or a wall surface, and a low temperature liquid is flown through an embedded pipe by a finishing material,
Although there was a method to cool the wall surface and ceiling surface to lower the indoor temperature, there was a problem of dew condensation below the indoor dew point temperature, and the liquid temperature could not be lowered. Therefore, for dehumidification, indoor air or outside air was dehumidified by another cooling method before being sent. In other cooling methods, when a low-temperature liquid is flown through the heat exchange fins and the air is blown indoors by mechanical blowing, the wind speed on the fin surface is around 2 m / s when considering efficiency,
About 20% of the indoor air passes through the heat exchange fin without being treated. Also, if the temperature of the air outlet is blown out below the dew point temperature, the problem of dew condensation near the air outlet will occur.
Recent air-conditioning related industry magazines treat indoor air to a temperature close to supercooling and send it through a high-speed duct, and mix the treated air with other air in a mixing box near the outlet. In some buildings, the temperature and humidity are controlled by blowing from the outlet. Further, in the industrial world, after supercooling indoor air or outdoor air, it is heat-treated again and blown indoors, which is the best method for humidity control. In addition, there is a natural convection method and a radiation method as a method that does not use mechanical ventilation for heating, which creates a pleasant environment. However, in the air conditioning, it is the current situation that it is not generalized due to the relationship between humidity and the temperature difference between radiators.

[0003]

In the conventional ceiling radiant cooling and wall radiant cooling, the air can be cooled but the dehumidification cannot be performed. INDUSTRIAL APPLICABILITY According to the present invention, a low-temperature liquid having a dew point temperature or lower is supplied to indoor air to cool and dehumidify the indoor air with a heat exchange fin incorporated therein, and to be circulated by natural convection due to a difference in specific gravity of the indoor air In the case of the conventional mechanical ventilation, which is mainly intended to dehumidify indoor air, the wind speed is fast and the dehumidification function is not always good with respect to the heat exchange fins. In the present invention, the contact time between the heat exchange fins and air is long due to natural convection, and the function as dehumidification can be satisfied. In addition, the sensible temperature of a person has a correlation between the dry-bulb temperature and the wet-bulb temperature, and if the relative humidity is controlled to 50% or less, the sensible temperature becomes the same even if the temperature is higher than the control by the current temperature, and dehumidification is mainly performed. By using the natural convection type dehumidifying air conditioner, it becomes possible to perform air conditioning with a refreshing heat. If the automatic control is set to operate the natural convection type air conditioner at the dry-bulb temperature of 28 ° C and the relative humidity of 45% or more as the standard of indoor air temperature in summer, energy saving of 10% or more can be achieved. When this natural convection type dehumidifying air conditioner is used, a heat storage tank is installed and the temperature of the liquid is kept at 0 ° C to 7 ° C by a refrigerator.
If it is used by storing heat at a low temperature around ℃, more energy-saving effect will be obtained. The original purpose is to cut the peak of electricity and save energy. If the floor heat storage and the capacity of the heat storage tank are determined by the load calculation, it is possible to air-condition by using night power, which can be used as a method different from the ice heat storage method. . Also, with the ventilation frequency of the room being three times, the circulation amount by natural convection is about 72 cubic meters per hour for 1 m of natural convection type dehumidifying air conditioner, and can be sufficiently secured. And because the excessive mechanical sensation of cold air is eliminated and there is no moving part due to power, it is possible to use it up to the same service life as a building if the liquid is flowed at an appropriate flow rate. The use of natural materials for interior materials in modern buildings is rare, and the moisture contained in the air inside the building is not absorbed.
We would like to solve the problems of natural convection type dehumidifying air conditioners as well as natural moisture absorption by using natural materials for indoor finishing materials.

[0004]

In order to exert the function of the natural convection type dehumidifying air conditioner, the larger the difference between the intake side air temperature and the outlet side air temperature, the better. However, in the case of an ordinary heat transfer tube, the liquid inflow side A temperature difference between the outflow side and the outflow side occurs, and the capacity of the entire apparatus decreases. We devised a heat transfer double constant temperature tube device in order to flow the liquid to the heat transfer tube at an average temperature as much as possible. In addition, since indoor air flowing in from both sides of the natural convection type dehumidifying air conditioner installed on the ceiling surface interferes with the upper part of the heat exchange fins, a partition wall with a curved surface is provided at the center as a preventive device to guide the heat exchange fins. I am doing good convection. The treatment of condensed water generated in the heat exchange fin portion was solved by forming the heat exchange fin portion into a shogi piece and forming a V-shaped groove on the surface of the heat exchange fin. The shape of the condensate receiver is also a shape that takes natural convection into consideration.

The main body has a box shape and is made of wood in consideration of heat insulation, weight and durability, and has a lattice shape on both the air intake side and the air outlet side.

The heat transfer double constant temperature tube has a double tube structure of an outer tube and an inner tube, and a two-way dividing device in which a two-way dividing device for the outer tube and the inner tube is attached inside the outer tube on the liquid inflow side. Is a structure in which a liquid having a low flow velocity flowing on the pipe wall side of the liquid flowing to the outer pipe is caused to flow into a gap between the outer pipe and the inner pipe, and a liquid in a central portion having a high flow velocity is caused to flow toward the inner pipe side. That is, the liquid flowing on the outer pipe side is in a straight traveling state, and the flow velocity is slower than that on the inner pipe side, so that the amount of heat transfer can be controlled. The liquid flowing through the outer pipe becomes a vortex flow due to the angled notched partition wall provided in the middle of the inner pipe, so that the heat of the liquid flowing through the inner pipe is taken away and is easily transferred to the outer pipe side. The heat transfer double constant temperature tube is a heat transfer double constant temperature tube in which the amount of heat is averaged by merging the heat transfer double constant temperature tube at a slightly distal end side from the central portion thereof to recover the liquid temperature. The material used is a copper tube, brass tube, or aluminum tube with good thermal conductivity, but the inner tube may be a SUS tube.

The shape of the heat exchange fins attached to the outside of the heat transfer double constant temperature tube is made into a shogi piece shape because of the relationship of the treatment of condensed water, and the V-shaped groove on the heat exchange fin surface is faster. This is because the condensed water is guided to the condensed water receiver. The V-shaped grooves on both ends of the fins are for preventing condensed water from falling.
Not forming a water film on the fin surface is an effective method for improving natural convection and improving heat exchange efficiency. The material of the heat exchange fin is a copper plate or an aluminum plate having good heat conductivity and is crimped to the outer tube portion of the heat transfer double constant temperature tube.

The indoor air intake ports of the natural convection type air conditioner are located on the left and right sides, and when introduced into the heat exchange fin surface, they interfere with each other at the upper part. As a preventive measure, an interference preventive plate with a curved surface is provided at the center of the upper part of the fin, which is used as an interference preventive measure. The preventive plate is lowered close to the heat exchange fins, and separates the flow of air flowing in from the left and right. In addition, the heat exchange fin housing main body has a double structure to prevent damage to condensation and temperature conduction due to the temperature difference between the indoor temperature and the heat exchange section.

The condensate water receiver has a diamond-shaped upper part cut out so that it does not interfere with natural convection, the outside is woody to prevent condensation, and the inside is covered with a metal plate. The groove is V-shaped. It has a shape that makes it easy to drain even with a gradient of 1/50 or more. Adhesive tape is used to join the wood to the metal plate to secure some space for heat insulation. When used for a long period of time, fiber dust and dust naturally adhere to the heat exchange fins, are washed away by the condensed water, and accumulate in the groove of the V-shaped condensed water receiver. Especially V
Since it concentrates on the joint between the mold groove and the drainage pipe, the latticed outlet of the treated air on the air outlet side can be removed for cleaning and inspection. The condensed water receiver is supported by a copper wire or SUS wire suspended from the heat transfer outer tube.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described by way of examples with reference to the drawings. FIG. 1 shows the body of a natural convection type dehumidifying air conditioner, which is buried in the ceiling except for the dehumidified air outlet. The main body 1 is made of wood and flows in through the indoor air lattice-shaped suction port 7 and is guided to the heat exchange fin 3 without resistance by the suction air interference prevention plate 2. The temperature of the heat exchange fins is 9.5 ° C on average The air temperature during dehumidification is about 15 ° C on average, the air is dehumidified and cooled, and the specific gravity is about 7% heavier than the indoor intake air. It flows out by natural convection from the outlet and mixes with indoor air. The relative humidity at that time is about 40%, 45%
It is possible to control humidity. Standard room ventilation rate is 3
For the removal of the humidity of the outside air taken in and the humidity generated indoors, the lattice-shaped outlet of this natural convection type dehumidifying air conditioner has an effective opening area of 0.1 m per 1 m per 1 m.
^{At 2} , the wind speed is 0.2-0.3 m / s and the throughput is about 72 cubic meters per hour. The material of the suction air interference prevention plate of No. 2 is made of wood, and the curved surface is made of 45 mm wood lumber, and the prevention plate is pressed in from both sides in a smooth state and fixedly joined. Prevent plate is 10
It is a state in which it is lowered to a position 5 mm away from the upper part of the heat exchange fin with a wood plate of mm. The prevention plate is fixedly joined to the top plate portion at the center of the main body and also serves to support the heat exchange fin main body.

In the embodiment shown in FIG. 3, the space between the heat exchange fins 3 is about 5 mm, and in the case of mechanical ventilation, the space between the heat exchange fins is 3 mm, but the natural convection type dehumidifying air conditioner has a wind speed. However, the interval is 5 mm due to the dehumidifying main force. Reference numeral 4 denotes a double side wall of the main body, which is a storage main body of the heat exchange fins. The side wall has a double structure to prevent condensation due to temperature difference and prevent convection due to temperature conduction. The material of the side wall is also wood, and is composed of a wood of 5 mm from the outside, an air layer of 5 mm, and a wood of 5 mm, which is a total of 15 mm. The heat transfer coefficient of this side wall is 2.43 kcal / h per m ² , and there is a sufficient heat insulating effect at ° C. In addition, the distance between the heat exchange fins and the double side wall is 2 mm on both sides to prevent escape of untreated air.

The embodiment shown in FIG. 4 is a heat exchange fin 3 having a V-shaped groove at a position of about 5 mm toward the inner side of the left and right, a total of 6 grooves inside and a V-shaped groove at the bottom. It is a groove for promptly guiding the condensed water to the condensed water receiver 6 and has a function of preventing the condensed water from falling. The material of the heat exchange fins is a copper plate or an aluminum plate, which is press-worked and press-bonded to the heat transfer outer tube 5. The V-shaped grooves all have a depth of 2 mm, and the brim portion in contact with the heat transfer outer tube is 3 mm. The heat transfer area of the heat exchange fin is 5.1 m ² per 1 m as a standard product, and the cooling capacity is 700 to 1,000 kcal per hour of the apparatus. Reference numeral 6 denotes a condensed water receiver, which is formed by cutting out the upper portion of the rhombus so as to prevent natural convection as much as possible. In addition, the drainage gradient is easy and the flow of drainage is good, and the inside is covered with a metal plate and the outside is woody. The angle of the diamond is 30 ° with respect to the vertical, and the angle of the notch is 30 ° with respect to the horizontal direction. The effective depth of the drainage groove is as deep as 40 mm, and inspection once a year is sufficient. In addition, preventive materials are attached to the left and right of the upper part of the heat exchange fins to prevent air from escaping through the gap. Others 8
The latticed outlet for treated air is removable for future drainage inspection and cleaning.

The embodiment shown in FIG. 5 shows a schematic mounting position of the diversion device 9 and the swirl device 10 and the mixing portion 11 to the heat transfer constant temperature double tube. The liquid flow is integral up to the diversion device 9 and the flow velocity is about 1 m / sec, and reaches the diversion device 9 but the flow velocity on the pipe wall side is slow and 0.6 m / sec.
Before and after. The flow is divided into two by the two flow divider 9 and the liquid on the tube wall side with a slow flow velocity flows into the gap between the heat transfer outer pipe 5 and the inner pipe 13 and the liquid with a high flow velocity at the center of the pipe 13 It flows to the inner pipe side. At the 2 shunt of No. 9, the opening area becomes about 65% with respect to the other gaps, and it becomes slower. With the liquid exiting the two-stream diverter of 9, the liquid flowing through the heat transfer outer tube side of 5 goes straight and reaches the swirl of 10 to become a swirl due to the angled notch, and at the mixing part of 11, It merges with the liquid on the inner pipe side of 13 and reaches the outflow side. The mounting position is 1.2m up to the first vortexer 1m, 0.8m, when the 20mm heat transfer outer tube is 7m.
At 0.6m, 0.4m, it will merge. The position changes depending on the cooling capacity.

The embodiment shown in FIG. 6 is a shunt of 9.
5 is attached to the heat transfer outer tube inflow side and divides the liquid flowing in from the heat transfer outer tube into 2 parts. When the liquid flows in the tube, the tube wall side is slow, the tube center is fast, and the slow tube wall side liquid. To
It is structured such that the heat transfer outer tube of 5 and the inner tube side of 13 are caused to flow in the space between the two flow dividers 9 and the liquid having a high flow rate is passed to the inner tube side. The amount of liquid flowing through the gap from the diverter 9 is 65% of the opening area of the heat transfer outer tube and the inner tube 13 side, but the opening area can be changed. Is.
In other words, in the 9-way shunt, the position of 13 to join with the inner pipe side,
The opening area can be increased / decreased depending on whether it is inside or outside the inner tube. The material of the diversion device 9 is gun or brass, and is manufactured by machining. The inclination angle from the outer pipe side to the inner pipe side is 11.5 °, which is a gentle angle and has the same inner diameter as the inner pipe. The inner diameter of the bifurcating device 9 connected to the inner pipe of 13 is 0.1 mm and the thickness is 0.5 mm, and the joint connected to the inner pipe of 13 is silver brazing. Attached to the inflow portion of the heat transfer outer tube of 5, there are four convex portions in the two-way divider of 9 and silver brazing is performed inside the heat transfer outer tube. The inside of the heat transfer outer tube 5 is linearly joined, but the liquid goes straight with a step of 0.5 mm inside the inner tube 13 which contacts the inner tube. The flow velocity of the liquid is 1m / sec just before entering the diversion device of 9 and 2
With 0 mm heat transfer outer tube, 1,200 liters / hour, 25
mm is 2,400 liters per hour, and if the temperature difference between the inflow side and the outflow side of the liquid temperature is 4 ° C., 20 mm is 4,
800 kcal and 25 mm can absorb 9,600 kcal heat. In addition, when the average flow velocity is 1 m, it is faster than 1 m in the central part and slow at about 0.6 m on the pipe wall side, and when passing through the two-way diverter of 9, the flow velocity is about 65% due to the opening area of 65% to the gap between the outer pipe and the inner pipe 10 at 0.5m
After passing through the swirler of No. 11, the mixing section of 11 becomes about 0.3 m, and the inner volume per 1 m of the gap between the heat transfer outer tube of 5 and the heat transfer outer tube of 20 mm with respect to the inner tube of 13 is 0.1358 liters. The inner volume per meter of the inner tube 15 mm is 0.1642.
The flow rate at the mixing section of 11 is
2.45 liters per minute, about 17.55 minutes per minute on the inner tube side
There is a big difference from the liter. Due to this difference, the heat absorption amount of the heat exchange fins is averaged, and the function of the natural convection dehumidifying air conditioner is improved.

The embodiment shown in FIG. 8 is ten swirlers,
No. 13 is attached to the outside of the inner pipe, and there are four notches, the angle is 30 °, and the liquid flow straight ahead from the two-stream shunt of 9 becomes a vortex by passing the heat on the inner pipe side. The opening area of the notch portion, which plays a role of moving to the tube side, is about 75% of the gap, and the mounting intervals of the next 10 swirlers are sequentially shortened. The material of the vortex machine is made of gun metal or brass by machining. The width of the vortex machine is 10 to 15 mm, and there are four convex parts, and the inside is 0.
It has a ring-like form with a thickness of 5 mm. The inner diameter of the swirler is 13
The inner tube and outer diameter are larger by about 0.1 mm, which is a joining margin. For joining, use silver brazing on the inner tube side,
The four protrusions contacting the outer pipe are used as solder plating to prevent damage to the outer pipe 5 due to vibration of the inner pipe. In order to prevent the escape water in the outer tube side clearance of 5, a tightening process is performed from the outside of the outer tube with a roller or the like. The area of the cross section through the 10 swirlers is 0.8 square centimeters and flows in the 5 outer tube at an angle of 30 °.

The embodiment shown in FIG. 10 is a mixing section 11 in which the liquid flowing in a vortex on the side of the heat transfer outer tube 5 is 13
This is a place where liquids flowing straight along the inner tube side of are mixed. The inner tube of 13 was cut at a 45 ° angle to facilitate mixing. If the temperature of the inflowing liquid is 5 ° C, the opening area is adjusted by the 2 shunts of 9 so as to mix at around 7 ° C. Adjust the temperature to about 2 ℃.

The embodiment shown in FIG. 13 is a case where the natural convection type air conditioner 1 is mounted by exposing the ceiling, and the capacity is increased as compared with the ceiling-embedded type because the intake air does not make a U-turn.
There is also a method of passing the return tube of the heat transfer outer tube of 5 through the upper part of the heat exchange fin of 3, but in that case, it is not effective unless the length of the heat exchange fin is increased.

The embodiment shown in FIG. 14 is an embodiment in which the heat transfer constant temperature double pipe is used for floor heating. The heat transfer constant temperature double pipe has a width of 0.4 m and a floor area of 25 to 30 m in length. Can be controlled within a certain temperature range, and we are considering using floor heating. As an example, depending on the finishing material of the interior, the average temperature of the flowing liquid is 30 to 35 ° C.
If it is set to 5 mm and 600 liters per hour is flown, about 16 m ² of floor heating is possible.

[0019]

Since the present invention is constructed as described above, the following effects can be obtained.

Since the humidity control is the main factor, the indoor temperature should be kept within 2 to 3
It can be set higher by ℃, and as a result, about 10% energy saving can be achieved.

Since it is not a mechanical air blower, it is suitable for a room or office, an old man's facility, a hospital, a school facility, etc., where there is little movement of people, in a quiet environment without a chilly feeling.

Since there is no mechanical part, the service life is long and no noise is generated. However, when the flow velocity of the liquid is increased, noise is generated at the position of the shunt, but there is no problem if the flow velocity is set to about 1 m / sec.

The natural convection type dehumidifying air conditioner is the most effective way of using the heat storage tank, and can also be used as a measure for peak cut of electric power. Also, if the automatic control is set so that the room temperature does not operate at 28 ° C. or lower and the humidity is controlled at 45% or more, the operating time per day is short and energy saving can be more effectively performed.

If a natural convection type dehumidifying air conditioner is installed on the ceiling near the window affected by the radiant heat of the sun, the indoor air at a high temperature in the ceiling can be used more effectively by the natural convection type dehumidifying air conditioner.

If the heat storage tank and the floor heat storage are used together, the air conditioning by using the electric power at midnight becomes possible and the more economical operation becomes possible. The capacity of the heat storage tank in that case is 5 per 1 m ² of floor area.
A capacity of 0 liters enables air conditioning for 24 hours.

It is easy to think that the equipment cost will be high, but it can be amortized in about 7 years due to the reduction of operating cost by using the late-night power. For that purpose, it is possible to economically utilize the heat of the low temperature side and the high temperature side of the refrigerator in the two heat storage tanks of the low temperature tank and the high temperature layer, by storing the heat in the respective tanks and reusing them.

The number of times the refrigerator is started and stopped is small, and efficient operation is possible. Therefore, the service life of the refrigerator is extended and the economy is improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a natural convection type dehumidifying air conditioner.

FIG. 2 is a perspective view of a natural convection type dehumidifying air conditioner.

[Fig. 3] The upper part when the heat exchange fin is attached to the main body,
FIG.

FIG. 4 is a detailed vertical cross-sectional view of a heat exchange fin.

[Fig. 5] A two-way flow divider for the entire length of the heat transfer constant temperature double pipe,
It is a mounting position figure of a swirler, a mixing part, etc.

FIG. 6 is a cross-sectional view of the two-way divider.

FIG. 7 is a vertical cross-sectional view of the bifurcating device.

FIG. 8 is a cross-sectional view of a swirler.

FIG. 9 is a vertical cross-sectional view of a swirler.

FIG. 10 is a cross-sectional view of the mixing section.

FIG. 11 is a detailed cross-sectional view of the shunt.

FIG. 12 is a detailed vertical sectional view of the bifurcating device.

FIG. 13 is a vertical cross-sectional view of a case where a natural convection type dehumidifying air conditioner is attached with the ceiling exposed and a case where a return pipe is passed through the upper portion of a heat exchange fin.

FIG. 14 is a vertical cross-sectional view when the heat transfer constant temperature double tube is used for floor heating.

[Explanation of symbols]

1 Natural convection dehumidifying air conditioner body 2 Suction air interference prevention plate 3 heat exchange fins 4 Double side wall of the body 5 Heat transfer outer tube 6 Condensed water receiver 7 Indoor air lattice intake 8 Processed air lattice outlet 9 2 shunt 10 whirlpool 11 mixing section 12 socket for joining 13 Inner tube 14 Heat transfer plate for floor heating 15 Floor finishing material

Claims (3)

[Claims] 1. A heat transfer tube comprising an outer tube and an inner tube,
Liquid inflow A flow divider is provided inside the outer pipe, and the liquid flow to the outer pipe and the inner pipe is divided into two, and the flow rate to the outer pipe is controlled and the temperature for the heat exchange fins attached to the outer pipe is controlled. This is the part that makes changes less. In addition, the partition wall attached to the outside of the inner pipe at a certain distance is provided with an angled notch, and the heat of the inner pipe is moved to the outer pipe side by making the subsequent flow of liquid into a vortex flow to make the temperature uniform. At the same time, the liquids of the outer and inner pipes are mixed and mixed at the part closer to the tip than the center point of the entire length, and the heat transfer fins are attached to the heat exchange fins attached to the outer pipe to equalize the amount of heat transfer. It is a heat-controlled double tube. 2. The shape of the heat exchange fin is made into a shogi piece shape, and a V-shaped groove is formed on the heat exchange fin surface to guide condensed water generated when cooling the air to the groove more quickly and to provide a means other than the condensed water receiver. Has the function of not falling. It also has the function of keeping the natural convection good by reducing the air resistance by reducing the wetness of the fin surface. 3. Good results cannot be obtained unless air interference is prevented in the upper suction portion of the heat exchange fins in order to improve natural convection. As a countermeasure, an interference prevention plate with a curved surface at the center of the upper part of the heat exchange fins has an interference prevention function for the air sucked in from the left and right.