JP3163250U - Roof cooling system - Google Patents

Abstract

A roof cooling system capable of efficiently cooling the entire roof is provided. A spray nozzle 6 disposed on a roof 3 of a building 2 for discharging mist-like water, and applying a high voltage to the spray nozzle 6 to charge the mist-like water discharged from the spray nozzle 6. A high-voltage power source is provided, and water particles discharged from the spray nozzle 6 are attracted to the surface of the roof 3. In addition, a retaining member 17 that retains water adhering to the surface of the roof 3 is laid on the upper surface of the roof 3, and the cooling effect due to latent heat of evaporation is prevented by preventing water from immediately flowing down due to the gradient of the roof 3. To increase. [Selection] Figure 1

Description

  The present invention relates to a roof cooling system, and more particularly to a roof cooling system that cools a roof using sensible heat of water and latent heat of vaporization.

  The temperature of the roof of a building may increase greatly due to the effects of solar radiation. In particular, in buildings such as factories and gymnasiums where the roofing material is made of metal, the surface temperature of the roof becomes extremely high in summer, and as a result, the internal space of the building is heated by the radiant heat, and the cooling load is increased. Moreover, in urban areas, the temperature around the building rises due to the heat radiated from the roofing material, which promotes the heat island phenomenon.

  As a means for alleviating such a situation, a system for cooling a roofing material by providing watering means on the roof of a building and flowing water along the roof (using the gradient of the roof) is known. Specifically, in the system shown in Patent Document 1, when the temperature of the roof surface exceeds 40 degrees, water is sprinkled by watering means, and the temperature of the roof is lowered below the outside air temperature.

  However, in this kind of cooling system, the sprinkled water quickly flows down along the slope of the roof. Therefore, in order to cool the roof material effectively, a large amount of water must be sprayed, and the water cost increases. Had the disadvantages. In addition, a system that collects the water that has flowed down and uses it again for watering (that is, a system that circulates cooling water) has been proposed, but this requires a large-capacity circulation device, which is large and expensive. End up.

  On the other hand, as shown in Patent Document 2, a system that includes a spray nozzle that discharges mist-like water and sprays mist-like water onto the surface of a structure such as a wall surface of a building to lower the surface temperature. Proposed. According to this, the surface of the structure becomes moist, and not only the sensible heat of water (the amount of heat consumed to change the temperature without changing the state of water) but also the latent heat due to evaporation (water evaporates). Sometimes, the surface of the structure can also be cooled by the amount of heat absorbed without a change in temperature.

  However, even if such a spray nozzle is used, it is difficult to efficiently cool the entire roof. Because, in order to wet the entire surface of the roof with a limited number of spray nozzles (spray water), it is preferable to discharge upward or obliquely upward so as to reach far away, This is because water particles are likely to scatter and it is difficult to spray water uniformly over the entire surface of the roof. In particular, when the wind is strong, the discharged water particles are swept away by the wind and sprayed to a part of the water or dissipated into the atmosphere without adhering to the roofing material. There has been a problem of significant reduction.

  Then, this invention makes it a subject to provide the roof cooling system which can cool the whole roof efficiently in view of said actual condition.

The roof cooling system according to the present invention is
"A spray nozzle that is placed on the roof of the building and discharges mist-like water;
Charging means for applying a high voltage to the spray nozzle and charging mist-like water discharged from the spray nozzle. "
It is characterized by this.

  Here, the number of “spray nozzles” disposed on the roof surface may be one or a plurality, but when a plurality of “spray nozzles” are provided, it is preferable to dispose them at a predetermined interval. The spraying of water by the spray nozzle may be performed constantly (continuously), but may be performed intermittently at a predetermined timing, and further, the temperature of the roof surface is detected and the predetermined temperature is detected. It may be performed only when it is higher.

  According to the present invention, mist-like water is discharged from the spray nozzle disposed on the roof surface of the building. Thereby, the surface of the roof becomes wet or wet, and the surface temperature of the roof decreases due to sensible heat of water. Moreover, since water adhering to the surface of the roof evaporates due to the heat of the roof, it is possible to take heat away from the surface of the roof, that is, to cool the surface of the roof, even by latent heat generated at that time.

  In particular, the mist-like water discharged from the spray nozzle is charged by the charging means (that is, a high-voltage power source), so that the discharged water particles are attracted to the surface of the roof. For this reason, scattering of water particles is suppressed, and water particles can be sprayed evenly over the entire surface of the roof. Therefore, the cooling effect by sensible heat of water and latent heat of evaporation can be enhanced, and the entire roof can be efficiently cooled.

  The roof cooling system according to the present invention may be configured such that “the roof of the building is made of a conductor and is grounded to the ground”.

  According to this, the entire roof has the same potential as the ground. That is, a high voltage is applied between the spray nozzle and the roof. For this reason, it becomes possible to produce a suction force reliably to the charged water particles.

  Further, in the roof cooling system according to the present invention, it may be “further provided with a retaining member that is laid on the roof surface of the building and retains water adhering to the surface of the roof”.

  Here, the “stagnation member” may be any member that restricts the water adhering to the roof surface from flowing down along the slope of the roof (which makes it difficult to flow), and the function of reliably preventing the flow. Is not required. Specifically, the surface of the roof is formed by a plurality of protrusions, such as an artificial turf (synthetic fiber mat), to suppress the flow of water, or on the roof, such as a water retaining ceramic And those that absorb and retain the moisture.

  By the way, the greater the amount of water discharged from the spray nozzle, the higher the cooling effect by sensible heat of water. However, if the amount of water particles adhering to the roof becomes too large, it tends to flow down along the roof gradient, making it difficult to contribute the adhering water to the latent heat of evaporation.

  In contrast, in the present invention, since the staying member is laid on the roof surface of the building, it is possible to suppress the attached water from flowing down and contribute to latent heat of evaporation. Therefore, the cooling effect by sensible heat and latent heat of vaporization can be further enhanced.

  As described above, according to the roof cooling system of the present invention, water particles discharged from the spray nozzle can be uniformly and efficiently attached to the surface of the roof. Therefore, the cooling effect by the sensible heat of water and latent heat of evaporation can be enhanced, and the entire roof can be efficiently cooled.

It is a conceptual diagram of the spraying apparatus in the roof cooling system of this embodiment. It is a block diagram which shows the electrical structure in a roof cooling system.

  Hereinafter, the roof cooling system of this embodiment is demonstrated based on FIG.1 and FIG.2. As shown in FIG. 1, the roof cooling system 1 of this example includes a spray device 5 disposed on a roof 3 of a building 2. The roof 3 of this example is a so-called “metal roof” using a conductive copper plate or the like as a roof material, and is grounded to the ground E via a ground line A1. In addition, although not shown in figure, the glass fiber sheet and the foaming polyethylene sheet are affixed on the back surface of the roofing material.

  The spray device 5 sprays mist-like water (mist) as cooling water, and a plurality of spray nozzles 6 disposed on the roof 3 of the building 2 and water supply connected to each spray nozzle 6. A pipe 7 and a pump 8 that pumps water to the spray nozzle 6 through the water supply pipe 7 are provided. Although the arrangement of the plurality of spray nozzles 6 is not particularly limited, in this example, nozzle groups arranged in a line at equal intervals are arranged in the top portion of the roof 3 and the middle portion of the roof 3. Yes. In addition, each spray nozzle 6 is installed such that the tip portion (spray port) faces upward or obliquely upward, and the mist is discharged from the plurality of spray nozzles 6 at the same time, thereby covering the entire surface of the roof 3. It is possible to spray water.

  The spray nozzle 6 includes a spray port (not shown), and generates fine water particles (for example, particles having an average particle diameter of 100 μm or less) when the cooling water is discharged to the outside. Further, as shown in FIG. 2, the spray nozzle 6 is provided with a voltage application unit 6 a to which a voltage is applied, and the negative pole of the high-voltage power supply 10 is connected via the electric wire 11. Note that the positive pole of the high-voltage power supply 10 is grounded to the ground E via the ground line A2. When a high voltage is applied to the spray nozzle 6 in this way, the water particles discharged from the spray nozzle 6 are charged to the negative side and split into fine mists (including water droplets) due to electrostatic force. It is possible to draw toward a certain roof 3. In addition, since this kind of spray nozzle 6 is used in the field of electrostatic coating or chemical solution spraying to plants, detailed explanation is omitted here, but diffusion of mist sprayed from the spray port is omitted. An annular electrode (not shown) arranged so as to surround the range is provided, and when a high voltage is applied from the high voltage power source 10 to the voltage application unit 6a, the mist sprayed from the spray port is charged by the annular electrode. It has become so. Here, the high-voltage power supply 10 corresponds to the charging means of the present invention.

  Moreover, in the roof cooling system 1 of this example, as shown in FIG. 1, the temperature sensor 16 which detects the surface temperature of the roof 3, and the retention member 17 which retains the water adhering to the surface of the roof 3 are further provided. ing. The stay member 17 is made of a synthetic fiber mat such as an artificial turf. The stay member 17 is laid over the entire surface of the roof 3 and has unevenness on the surface of the roof 3. To prevent water from flowing along. Further, the base of the staying member 17 is formed in a net shape, and the surface of the roof 3 is exposed through a plurality of openings (not shown) penetrating in the vertical direction, and the water staying on the roof 3 is retained. It is supposed to evaporate. In addition, it is preferable to fix the staying member 17 to the roof 3 so that the staying member 17 is not blown by wind or washed away by rainwater. Examples of the method for fixing the stay member 17 include adhering the stay member 17 to the roof 3 with an adhesive, or covering the entire stay member 17 with a net-like pressing member.

  Further, as shown in FIG. 2, the roof cooling system 1 is provided with a control device 18. The control device 18 includes a central information processing device (CPU) that performs calculation and control, and a storage device that includes a read-only memory (ROM) and a random access memory (RAM). The cooling process is performed. An operation switch 19 such as an operation switch for instructing start and stop of operation and a temperature sensor 16 attached to the roof 3 are connected to the input side of the control device 18, while the output side of the control device 18 is connected to the output side of the control device 18. The high-voltage power supply 10 and the pump 8 are connected, and the high-voltage power supply 10 and the pump 8 are driven and controlled based on signals from the operation switch 19 and the temperature sensor 16.

  Next, the operation and effect of the roof cooling system 1 will be described. When the surface temperature of the roof 3 detected by the temperature sensor 16 exceeds a predetermined temperature (for example, 40 ° C.), the control device 18 drives the pump 8 and activates the high-voltage power supply 10. By driving the pump 8, cooling water is pumped to each spray nozzle 6, and mist is discharged from all the spray nozzles 6 arranged on the roof 3. Thereby, the surface of the roof 3 becomes wet or wet, and the surface temperature of the roof 3 decreases due to sensible heat of water. Moreover, since the water adhering to the surface of the roof 3 evaporates due to the heat of the roof 3, the surface of the roof 3 can be deprived of heat by the latent heat generated at that time, that is, the surface of the roof 3 can be cooled. It becomes possible.

  Further, by the operation of the high-voltage power supply 10, a high voltage is applied between the spray nozzle 6 and the roof 3 as a conductor, and water particles discharged from the spray nozzle 6 are charged to the negative side. For this reason, the sprayed water particles are attracted to the surface of the roof 3. That is, scattering of water particles is suppressed, and water particles can be sprayed evenly over the entire surface of the roof 3.

  Moreover, in this example, since the retention member 17 is laid on the roof 3, even if the amount of water particles adhering to the roof 3 increases, the adhering water is prevented from flowing down along the gradient of the roof 3. As a result, the retained water can contribute to the latent heat of vaporization.

  The control device 18 temporarily stops the pump 8 and the high-voltage power supply 10 every predetermined time, and the surface temperature of the roof 3 is a predetermined temperature (for example, 40 ° C.) even after a certain time (for example, 1 hour) has passed. If the temperature does not exceed the value, it is considered that the temperature rise due to the influence of solar radiation has been eliminated, and the cooling operation process is automatically stopped.

  Thus, according to the roof cooling system 1 of the present example, the water particles discharged from the spray nozzle 6 can be uniformly and efficiently adhered to the surface of the roof 3, so that the sensible heat and evaporation of water. The cooling effect by latent heat can be enhanced and the entire roof 3 can be efficiently cooled. Further, along with this, heating of the internal space of the building 2 due to the radiant heat of the roof 3 can be suppressed, and the cooling load can be greatly reduced.

  The present invention has been described with reference to preferred embodiments. However, the present invention is not limited to these embodiments, and various improvements can be made without departing from the spirit of the present invention, as described below. And design changes are possible.

  That is, in the said embodiment, although the case where the roof cooling system 1 was applied to the electrically conductive roof 3 was shown, it applies to the roof which consists of non-conductive roof materials, such as a slate and a tile, or the roof made from concrete. It is also possible. In this case, it is possible to suck charged water particles by laying a conductive mat (not shown) on the roof.

  Moreover, in the said embodiment, although the mat made from a synthetic fiber was illustrated as the stay member 17, if it can suppress that a water flows along the gradient of the roof 3, you may comprise from another raw material. . Moreover, it is also possible to use what can absorb and hold | maintain the water | moisture content on a roof, for example, a water retention ceramic.

  Moreover, in the said embodiment, although it showed that the injection pressure of the mist sprayed from the spray nozzle 6 was made constant, a flow control valve is interposed in the water supply pipe 7, and a flow control valve is controlled by the control apparatus 18. Thus, the mist injection pressure and the discharge flow rate may be switched at a predetermined timing. According to this, since the arrival position of the mist periodically changes, it is possible to spray the mist on the entire roof 3 even with a relatively small number of spray nozzles 6. In addition, if a mechanism for periodically changing the spraying direction of the spray nozzle 6 is provided, it is possible to spray mist over a wider area.

  Furthermore, in the said embodiment, when the surface temperature of the roof 3 was higher than predetermined temperature, what showed the pump 8 and the high voltage power supply 10 starting was shown, However, regardless of the surface temperature of the roof 3, a user's driving | operation instruction | indication It is also possible to operate continuously based on the above. According to this, the temperature sensor 16 becomes unnecessary, and the cooling operation process in the control device 18 is simplified, so that it can be configured at low cost.

DESCRIPTION OF SYMBOLS 1 Roof cooling system 2 Building 3 Roof 6 Spray nozzle 10 High voltage power supply (charging means)
17 Staying member

JP 2000-297502 A JP-A-6-159886

Claims (3)

A spray nozzle that is disposed on the roof surface of the building and discharges mist-like water;
A roof cooling system comprising: charging means for applying a high voltage to the spray nozzle and charging mist-like water discharged from the spray nozzle.   The roof cooling system according to claim 1, wherein the roof of the building is made of a conductor and is grounded to the ground.   The roof cooling system according to claim 1, further comprising a retention member that is laid on the roof surface of the building and retains water adhering to the surface of the roof.

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