JPS608610Y2 - Greenhouse house heat exchange pipe equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a heat exchange pipe device for a greenhouse for cultivating tomatoes, cucumbers, strawberries, mandarin oranges, etc. in a greenhouse.

Greenhouses are built with daylight ballasts and are isolated from the outside air, so even in the middle of winter in Japan, the indoor temperature rises to a considerable degree (for example, over 30C!) due to sunlight during the day, but it cools down at night. (e.g. 10-15℃)
There is a large temperature difference between day and night.

On the other hand, care must be taken to ensure that these plants do not fall below the above temperature during cultivation, such as tomatoes at 8℃ or higher, cucumbers at 11℃ or higher, strawberries at 5-6℃ or higher, and mandarin oranges at 13'C or higher. It is.

Therefore, conventional methods have been adopted in which the air inside the greenhouse is stored underground during the day, and then returned indoors at night. Stand it upright and open both ends into the greenhouse during the daytime.
Air heated inside the greenhouse is intermittently sent into the underground pipes mentioned above, and the warm energy is stored underground through the pipe walls and exchanged with the soil), which lowers the room temperature of the greenhouse at night. At times, heat exchange pipe devices have been used that reduce the fuel load within the greenhouse by intermittently returning warm air in the buried pipes to the greenhouse.

However, with conventional equipment, the soil quality varies depending on the location [the distribution of clay and sand varies], so the heat storage capacity varies widely, and the heat storage capacity of soil is originally small (medium specific heat).
Therefore, there still remained the problem that the original purpose of heat exchange could not be fully achieved.

The present invention was developed in view of the above, and aims to improve the heat exchange efficiency by using still water rather than soil as the heat exchange partner using underground pipes, and by utilizing its relatively large heat storage capacity. The present invention will be described in detail with reference to a preferred embodiment; Fig. 1 is a partially cutaway schematic perspective view of the device of the present invention, Fig. 2 is an enlarged sectional view of an underground pipe portion, and Fig. 3 is a partially cutaway schematic perspective view of the device of the present invention;
The figure is a sectional view taken along the line ■-■ in FIG. 2, and FIG. 4 is a schematic plan view of the underground pipe.

In the present invention, both ends 31 and 32 are opened at a distance from each other into the indoor space of a greenhouse house 2 constructed on the ground by a light-emitting house main body 1, and a pipe 33. 34, and the space between the plunge pipes 33 and 34 is an underground pipe 35 for heat exchange, so that the indoor air a1 of the house 2 can be freely supplied or exhausted into this buried pipe 35. In the device, an outer pipe 4 is arranged along the longitudinal direction of the buried pipe 35 to form an inner and outer double pipe structure, and still water 6 is filled in the ring-shaped gap 5 between both pipes 35°4. , the above buried pipe 3
This relates to a heat exchange pipe device for a greenhouse, characterized in that the air a2 in the greenhouse and the still water 6 exchange heat.

In the figure, P indicates greenhouse-grown vegetables or fruit trees, E indicates soil, and GL indicates the ground line.

In the above configuration, indoor air of house 2 and buried pipe 3
In order to establish the amount relationship necessary for effective heat exchange with the air in the underground pipe 135, the value obtained by dividing the surface area of the underground pipe 135 by the floor area of the house 2 must be, for example, 1.0 to 0.8. May it be,
A large number of underground pipes 35 are used, and in this case, it is preferable that the plunge pipe 33, 34 is directed to one of the underground pipes 35 per unit.

Fig. 4 shows the outline of the process, in which a plurality of buried pipes 35 (12* in the figure...however, only two are shown for convenience in Fig. 1) are provided in parallel, and both ends of each are connected to joint pipes. 8, 8, and this joint pipe 8,
One plunge pipe 33, 34 is connected to each of the holes 8 and 8.

The pipes 33, 34, and 35 are preferably made of aluminum, stainless steel, or copper, which have good thermal conductivity.In addition to straight pipes as shown in the figure, corrugated pipes made of metal or plastic are also preferable because the surface area is increased.

The outer pipe 4 is preferably a thick-walled plastic pipe with poor thermal conductivity since there is no need for heat exchange with the ground, and is located at least 50 cm deeper than the GL.

In order to obtain a double pipe structure of the underground pipe 35 and the outer pipe 4, as shown in FIG. It is something that exists.

Furthermore, it is desirable that the buried pipe 35 and the outer pipe 4 maintain a relationship in which their axes are somewhat eccentric.

That is, as shown in FIG. 3, the axis of the outer pipe 4 is slightly offset downward from the axis of the buried pipe 35.

This is because the still water 6 causes convection due to the heat inside the pipe 35 and is heated up, so by making the upper gap in the gap 5 larger than the lower gap, upward convection is actively carried out and the convection efficiency is improved. This is to do so.

An air supply blower 7 is installed in conjunction with either (or both) ends of the pipe, and the blower 7 serves both the role of air supply and intake at the same time by reversing the direction. 7 is equipped with a duct that connects to each pipe opening end 31, but this duct is not shown]Static water 6 is introduced into the underground pipe 35 by a device not shown and left still. Removed when necessary.

When the inner surface of the underground pipe 35 comes into contact with the cold still water 6 on the outside, condensation water is generated on the inner surface, so in order to remove this, the pipe 35 has a slight slope throughout the pipe 35. A suitable ejector (not shown) is provided at the lower end.

The present invention has the above-mentioned configuration, and uses the blower 7 to intermittently send the air a1 inside the house 2, which is warm during the day, into the underground pipe 35, and exchange heat with the still water 6 outside of the underground pipe 35. 6 to store heat.

At this time, the temperature of the still water 6 in the pipe 4 is highest near the air supply location, and the temperature becomes lower near the air outlet.

Since still water 6 has a larger specific heat than soil, its heat storage capacity is large.

If the air a2 that has undergone heat exchange is returned indoors after some time, a large amount of the warming energy of the indoor air a1 during the daytime can be stored in the still water 6 underground.

Next, when the indoor temperature drops rapidly at night or at dawn, warm air a2 is taken out from the underground pipe 35 into the room, and cool indoor air a1 is sent into the pipe 35.

At this time, it is advisable to send the air a1 to the lower temperature side of the still water 6 in the pipe 4 in order to reduce the temperature loss of the air a2 introduced into the room.

By exchanging the capacity of the air a2 in the underground pipe 35 with that in the chamber 2 over an appropriate period of time, the temperature in the air chamber 2 rises and the purpose is sufficiently achieved. You can understand what you get.

It is also a good idea to use this principle as a cooler in the summer.

An automatic control and activation device is therefore preferably applied, which automatically activates the heat exchanger when the temperature slightly exceeds the minimum required temperature of the cultivated plants.

In this way, the present invention stores heat using the still water that surrounds the underground pipe in a ring shape instead of the conventional soil, so the heat storage capacity is large and the heat exchange efficiency is higher than that of the conventional method. It has excellent effects that can eliminate the problems of the prior art, such as the fact that it is much better, and that the use of an inexpensive heat exchange medium called water eliminates increased costs, troublesome handling, and worries.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway schematic perspective view of the device of the present invention, Fig. 2 is an enlarged sectional view of the underground pipe portion, and Fig. 3 is Fig. 2
The line sectional view and FIG. 4 are schematic plan views of the underground pipe. (Explanation of symbols), 1... House body, 2...
...Greenhouse house, 4...Outside pipe, 5...
...Ring-shaped gap, 6... Still water, 7...
...Exhaust pump, 8...Connection pipe, 9...
...Stay, 31.32...Both ends of the opening,
33, 34... Rush pipe, 35...
...Buried pipe, al, a2°asse@air.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Both ends 31 and 32 are opened at a distance from each other into the indoor space of a greenhouse house 2 constructed on the ground by the daylighting house body 1, and the portions connected to these ends 31 and 32 are underground. A pipe 33 and 34 are inserted into the pipe 33 and 34, and a pipe 35 is buried underground for heat exchange between the pipes 33 and 34, and air a1 inside the house 2 is sent into the pipe 35. Or, in a device that can be freely exhausted, the buried pipe 3
The outer pipe 4 is arranged along the longitudinal direction of the pipe 5 to form an inner and outer double pipe structure, and the ring-shaped gap 5 between the two pipes 35 and 4 is filled with static water 6 to remove the air inside the buried pipe 35. A heat exchange pipe device for a greenhouse, characterized in that heat exchange is performed between a2 and the still water 6. 2. The device according to claim 1, wherein a forced air supply/exhaust pump 7 is installed in combination with either or both of the opening ends 31, 32. 3. The device according to claim 1, wherein the axial center of the outer pipe 4 is slightly eccentric downwardly from the axial center of the buried pipe 35. 4 A plurality of the buried pipes 35 are provided in parallel, and both ends of each are connected by connecting pipes 8, 8, and one plunge pipe 33 is connected to each of the connecting pipes 8, 8.
．． ．． Claim 1 of utility model registration to which 34 is joined
Apparatus described in section. 5. The device according to claim 1, wherein the buried pipe 35 is held by a diametrical stay 9 so that its axis does not displace within the outer pipe 4.