JP2007138699A - Water spray heat exchanging method for gentle gradient folded plate roof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problems that: when a heating medium is diagonally sprayed to the corrugated surface of a conventional roof, wetting unevenness is likely to occur because of the presence of ridges as obstructions, and a heat radiation loss into the atmosphere is large because of the flying of particles in the open air. <P>SOLUTION: There is provided a water spray heat exchanging method for a gentle gradient folded plate roof which is carried out in the following manner. Strip members (1) having water permeability and water absorbing properties are bonded to inclined side surfaces of the ridge of the gentle gradient folded plate roof so as to protrude upward from the upper surface of the ridge, and a channel (2) in which a heating medium flows along the ridge is formed, whereby the heating medium discharged from a water spraying means on a channel upstream side into the channel is kept to stay in the channel. Then the heating medium passes through a protruding portion (4) of the strip to reach an intermediate portion of the same, and therefore the heating medium impregnated into the strips flows downward along the inclined side surface of the ridge, and reaches a valley of the folded plate roof. Further the heating medium is collected at the valley and led along the valley to be drained. In this manner, heat exchange between the surface of the folded plate roof and the heating medium is carried out. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a water spray heat exchange method for a gently sloping roof having a fold-and-half style, and more specifically to a water sprinkling snow melting method and / or a water sprinkling cooling method for a gently sloping fold roof. In heavy snow areas, it can be used for melting snow in the winter and for cooling the roof in the summer.
In the present specification, for the sake of convenience of explanation, the explanation is made taking snow melting as an example.

The unevenly folded half-roof roof with a gentle slope of 1/10 to 1/100 is a roof type that is often found in large-scale buildings because of its simple roof structure and excellent pressure resistance. As a snow-resistant roof structure with a snow cover of up to about 2.5 m, it is widely used in heavy snow areas.
The groundwater sprinkling system is generally used for melting snow on such a large gently-slanting folded roof, and there are many cases where sprinklers and spray nozzles are used. Spray spray can be diffused over a wide area, so if you have scattered sprayers, you can cope with this even if it is within the expected average snow cover even on a large roof surface. .

However, if a large amount of snow falls for a long time, the melting of the snow cannot catch up, and spraying the heat medium on the uneven surface of the roof in an oblique direction makes the ridges obstructed and uneven wetting, and the particles fly in the open air. Large loss of heat to the atmosphere.
Also, when the wind and snow are strong and the spray water is blown off, the effect of watering is lost. Under these circumstances, the snow pool expands, the remaining snow is connected, the roof surface is covered with snow over a wide area, a tunnel is formed on the lower side, and eventually the entire roof is covered with snow, and snow accumulation expands. The actual amount of snowfall is difficult to predict due to the large difference between light and severe years, and the possibility of a record heavy snowfall.

  There is a limit to how to increase the amount of heat input, such as by reducing the installation interval of the spreader or increasing the amount of water spray, in order to make room for the facility capacity. If the amount of water sprayed in heavy snowfall is about 0.5 liters per square meter per minute, it cannot be said that this amount of water is more than 2 tons per minute on a 5,000 square meter roof. The amount of consumption per property is over 120 tons per hour, and the daily amount is about 3000 tons. If this continues for several days, the amount of water is not normal, and the use of groundwater on large roofs is a permanent facility. It is hard to fall.

  This is a major obstacle when attracting large factories in heavy snow. There are restrictions on the drilling of new wells, which may not be permitted. In order to adopt the boiler heating method, it is necessary to prepare a large boiler managed by a qualified person and to prepare for high fuel efficiency.

As a solution to this problem, a method for melting snow by installing a flat plate on a roof to form a flat surface has been evaluated. Although this method is a flat surface and has excellent snow melting performance, it is practically equivalent to refurbishing the roof and has the disadvantage of increasing construction costs.
JP 2004-149784 A

  The problem to be solved is that the flat plate laid across the top of the folding roof is a lightweight member element that itself has snow-resistant strength, and the roof support structure taking into account wind pressure countermeasures Therefore, it is difficult to adopt from the viewpoint of cost-effectiveness if it is used for a large folding roof.

  In order to distribute the heat medium widely and uniformly on the roof surface, the present invention simultaneously melts snow at the top of the ridge and waters the surrounding area while retaining the heat medium in the initial stage on the upper surface of the ridge that is covered with much snow. The main feature is to melt snow on the entire roof.

The surface area of the roof ridge is small, so even if the amount of heat medium supplied is small, the heat medium pool can be reliably formed on the upper surface of the ridge, and the heat medium is inclined while melting the snow accumulated on the top. Can flow down to the side.
As a result of using the long and narrow ridges in parallel, the result is that one wide snowmelt surface is divided into small snowmelt surfaces with a small amount of water spray that are arranged with regularity. In order to distribute the heat medium evenly on the inclined side surfaces of the skirt, the water spray is distributed over the entire surface of the unevenness, and snow can be melted efficiently and in a short time. Since the sprinkling can be done very well, you do not have to waste the heat medium. There is an advantage that a limited amount of heat medium can be effectively used.

  The purpose of spreading the heat medium widely on the uneven roof surface, where it is difficult to spread the heat medium evenly, to ensure that the snow melts, was realized under the same procedure without changing the roof style.

  The strip material 1 provided with the water-permeable protrusion 4 is bonded to the inclined side surfaces on both sides of the ridge of the gently-slanting folded half roof so as to protrude upward from the upper surface of the ridge. The strip material 1 is formed on both sides of the upper surface of the ridge and forms a flow channel 2 through which a heat medium flows along the ridge. The flowing water channel 2 accumulates the heat medium flowing inside, and the heat medium passes through the protruding portion of the strip material and flows out to the middle position of the strip material. In addition, the heat-absorbing strip material is impregnated with the heat medium, and flows down along the oblique side surface of the ridge. The flowing heat medium gathers in the valley of the folded roof and flows along the gradient.

The folding half-roof shown in FIG. 1 has a structure in which a spirally wound connecting portion 3 is located in the center of the ridge. Due to the presence of the connecting portion 3, the strip material 1 is installed on each of the left and right sides of the ridge, and the flow channel 2 is formed on the left and right sides of the connecting portion.
FIG. 2 is a development view showing an example of the strip material 1 used in FIG. In this example, the protrusion 4 protruding above the upper surface of the ridge is formed by overlapping a part of the material. 1a is fixed to the upper surface of the ridge by bonding or the like, and suppresses deformation of the protrusion 4 to the outside. The sleeve portion 1b of the strip material is bonded and fixed to the inclined side surface of the ridge. FIG. 3 shows the adhesive state of the strip material 1.

  FIG. 4 shows an installation example of the strip material 1 when the upper surface of the ridge is flat. The strip material 1 of this example includes a pair of protrusions 4 at a distance corresponding to the width of the ridge. The protrusions in this example are also made by overlapping a part of the material as in the case of FIG.

A strip material having flexibility is used. For example, it is possible to use a water permeable plate in which a thick polyester woven fabric is heated and pressed at a high frequency to weld fibers while leaving a texture. These materials are flexible and are not easily deformed and damaged even when stepped on with a foot.
In order to improve the resilience to the deformation of the protrusion 4, it is preferable that it can elastically deform itself.

FIG. 6 shows the reinforcing plate 5 that is sandwiched when the materials are stacked. Use of the elastically deformable reinforcing plate 5 is advantageous in securing the restoration property of the protrusions. When a resin plate is used for the reinforcing plate, if it does not have water permeability, an opening 6 is formed so that the heat medium can flow out.
FIG. 7 shows an example of the installation form of the strip material using the reinforcing plate 5. The resin plate is sandwiched inside the protrusion, but its lower edge 5a is directed to the shoulder of the ridge, and the strip material serves as a pressing member to support the protrusion so as to be elastically deformable.

In the example shown in FIG. 1, the skirt portion 1 b of the strip material ends in the middle of the inclined side surface 4. This configuration is based on the idea that the amount of heat input to the upper part of the ridge and around the shoulder is set large, and the snow that falls on the inclined side surface outside the strip material slides down into the valley of the ridge.
The heat medium supplied to the upstream side of the flowing water channel 2 moves along the ridge gradient and flows out through the strip material while flowing through the flowing water channel 2, but it flows down because the strip material functions as a snow slipper. The heat medium melts the snow in place.

Since the flowing water channel 2 is opened upward, the stored heat medium comes into contact with falling snow, and the snow accumulated in the flowing water channel is rapidly dissolved by the inflow of the heat medium.
The heat medium flowing out from the flow channel flows down the inclined side surface of the ridge through the strip material, and melts while washing the snow adhering to the downstream surface not captured by the strip material. The heat medium and snow sherbet that have fallen down are collected and drained in the valley 5 between the ridges.
The supply of the heat medium into the flow channel can be performed by using, for example, a sprinkling pipe disposed on the upstream side of the flow channel. The installation interval of the sprinkling pipes depends on the temperature of the heat medium to be charged. For example, if the heat medium to be charged is 2 liters of hot water of 30 degrees Celsius, it is about 3.8 meters.

FIG. 8 shows an example of the projection 4 having a low height. If the height is lowered, the amount of water stored in the running water section will be reduced.
FIG. 9 shows a short example of the skirt portion 1 b of the strip material 1. If the hem is shortened, the snow that accumulates on the sloped side of the ridge will slip and easily collect in the valley.
FIG. 10 shows an example in which the strip material 1a is shortened.

  Because it is possible to melt and / or cool a snow-covered surface with a relatively small amount of heat medium, it is possible to use a well facility or a boiler facility to make a long, large-sized fold of tens of thousands of square meters such as factories, station buildings, and public facilities. It can also support the roof.

  It is a simplified explanatory drawing which shows an example of the water spray heat exchange method of this invention.   It is an expanded view which shows the structure of the strip material used for FIG.   It is a partial cross section figure which shows the affixed state of a strip material.   It is simplified explanatory drawing which shows the other example of the water spray heat exchange method of this invention.   It is an expanded view which shows the structure of the strip material used for FIG.   It is perspective explanatory drawing which shows an example of the method of providing elasticity.   It is a partial cross section figure which shows the other example of the sticking state of a strip material.   It is a partial cross section figure which shows the other example of the affixed state of a strip material.   It is a partial cross section figure which shows another example of the sticking state of a strip material.   It is a partial cross section figure which shows another example of the sticking state of a strip material.

Explanation of sign

1 Strip material 2 Flow channel 4 Protrusion 5 Reinforcement plate

Claims (3)

  Adhere a strip material with water permeability so that it protrudes above the upper surface of the ridge on the sloped side of the ridge of the gently-slanted folding half roof. Forming and storing the heat medium discharged from the sprinkling means upstream of the flow channel and flowing in the flow channel, and allowing the heat medium to pass through the protruding portion of the strip material and flow out to the middle position of the strip material, Sprinkle heat of a gentle gradient folding half roof that exchanges heat between the folded half roof surface and the heat medium by allowing the slanted side of the ridge to flow down while being impregnated in the strip material, collecting it in the valley of the folded half roof, and flowing and draining along the valley. method of exchange.   2. The water spray heat exchange method for a gently sloping folded half roof according to claim 1, wherein the strip material is flexible.   The water spray heat exchange method for a gently sloping folded half roof according to claim 1, wherein the strip material is elastically deformable.

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