JPS60235950A - Solar heat collecting device by permeable thin film - Google Patents

Abstract

PURPOSE:To enable to obtain the sufficiently high solar heat collecting efficiency with a light weight and low price device by a method wherein the air is made to pass through the whole surface of wide permeable thin films receiving the solar ray and that air is made to collect the solar heat. CONSTITUTION:Permeable thin films 4 which are made from a layer or multiple layers of metal nets, carbon clothes or another porous materials are heated by the solar heat giving the solar ray as well as the air is made to pass in the perpendicular direction through the whole surfaces of the permeable thin films 4, whereby the solar heat obtained by the permeable thin films is made to be collected to the passing air. The sufficiently high solar heat collecting efficiency can be obtained by this device of simple construction, light weight, furthermore, low price.

Description

DETAILED DESCRIPTION OF THE INVENTION Conventional solar heat collectors for air heating have a shape that incorporates a large number of fins due to the low heat transfer coefficient of air, which has the disadvantage of being extremely heavy and expensive. In contrast, the present invention relates to an extremely simple solar heat collector that collects solar heat by sucking air through the entire surface of a wide breathable thin film that receives sunlight, and an air source heat pump that uses the air as a heat source. It has the advantage of being lightweight and inexpensive.

FIG. 1 is a sectional view of an embodiment of a solar heat collector according to the present invention, and FIG. 2 is a detailed sectional view of the air permeable thin film of FIG. 1. 1
is the main body of the solar heat collector, which is a box tilted toward the sun. 2 is a transparent lid such as glass, and 3 is sunlight. Reference numeral 4 denotes a breathable thin film according to the present invention, which is stretched diagonally inside the main body 1. As shown in FIG. 2, the details of this breathable thin film 4 are made by overlapping wire meshes 5, 6, 7, etc. Also, 8 is a blower, 9, 1
0 indicates an air duct, and 11 indicates a suitable heat utilization device.

Now, the operation of the present invention will be explained. If you move the blower 8 now,
The air 12 inside the main body 1 passes vertically across the entire surface of the breathable thin film 4 as shown by the arrow 13, and at that time, the sunlight 3
The radiant heat that falls on the breathable thin film 4 is absorbed by the wire meshes 5, 6, 7.
Heat is transferred to the passing air by heat transfer between the air and the air.

Since the breathable thin film 4 has a shape similar to a collection of many cavities, sunlight is sufficiently reflected without being reflected much.
In addition, since the surface area of the air permeable thin film that comes in contact with the passing air is sufficiently large, the heat transfer between the two is extremely high.Therefore, the solar heat collection efficiency of this device is sufficiently high, and the structure is simple, lightweight, and
Low price.

FIG. 3 is a cross-sectional view of only the vicinity of the main body of an embodiment of the present invention when air heated by the air-permeable thin film according to the present invention is used as the heat source air of an air-source heat pump. Items 1 to 13 are the same parts as those with the same numbers in FIG. However, in FIG. 3, a finned tube 14 of an evaporator of a heating heat pump is provided inside the main body 1 as a heat utilization device. Further, the blower 8 is of a once-through type. A damper 15 is provided in an opening 16 in the side wall of the main body 1 near the duct 9, and is normally placed at the position shown by the solid line to close the opening 16. 16
, 17 are inlets and outlets for the working fluid of the heat pump.

Now, to explain the operation of the embodiment shown in FIG. 3, during sunshine, the damper 15 is at the position indicated by the solid line, so when the blower 8 moves, the air 12 in the main body 1 is transferred to the main body 1, the duct 9,
10, during which it receives solar heat from the breathable thin film 4, transfers the heat to the fin tube 14, and sends the heat to the heat pump. However, when there is no sunlight, if the damper 15 is rotated to the position indicated by the dotted line 19, outside air flows in as indicated by the dotted line 20 and flows out through the main body 1 as indicated by the dotted line 21. In this case, the outside air itself becomes the heat source and the heat is sent to the heat pump. In other words, with this device, any air-source heat pump can operate using solar heat as a heat source during sunshine hours and normal fresh air itself as a heat source during non-sunshine times, and it is easy to switch between the two.

FIG. 4 is a sectional view of the vicinity of the main body of an embodiment of the present invention in which a finned tube of an evaporator of an air-source heat pump is sandwiched inside the breathable thin film. FIG. 2 is a partial cross-sectional view and a partial plan view of the vicinity of the breathable thin film of the illustrated embodiment. In this embodiment, the breathable thin film 4 is the upper layer 2.
It consists of two layers, 2 and a lower layer 23, and the fin tubes 14, 24 of the heat pump evaporator, etc. are sandwiched between the two layers in the form of a sanderch. As a blower, an axial fan 25 as shown in the figure is housed inside the main body 1.

In this embodiment, during sunshine, the axial fan 25 operates and the damper 15 is at the position indicated by the solid line.
The air inside the main body 1 circulates inside the main body 1, and during that time, the air flowing only through the breathable thin film 4 picks up solar heat, and the air flow 26 passes near the fins of the fin tubes 14, 24, etc. 27 etc. give heat to the fin tubes 14, 24 etc., so the fin tubes 14, 24 etc. can operate as an evaporator of a heat pump. In addition, when there is no sunlight, by rotating the damper 15 to the position indicated by the dotted line 19, fresh outside air is introduced using the same principle as in the embodiment shown in FIG. becomes.

As described above, by combining the breathable thin film and the evaporator of an air-source heat pump in series, parallel, or in a sand-gerch configuration, and by providing an appropriate damper, air heated by solar heat can be transferred to the outside during non-sunshine times. It is possible to obtain a simple air heat source heat pump that can use the fresh air of the air as a heat source and is easy to switch.

Furthermore, the heat utilization device of the present invention may be any device such as a heat pump, a hot water heating device, a heat storage device, etc.
Its arrangement and shape are free.

Further, the position, shape, flow direction, quantity, control method, etc. of the blower and damper may be any.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the solar heat collector according to the present invention, FIG. 2 is a sectional view showing details of the breathable thin film of the embodiment of FIG. 1, and FIG. FIG. 4 is a sectional view of only the vicinity of the main body of an embodiment of the present invention when the heated air is used as the heat source air of an air source heat pump. 5 and 6 are a partial sectional view and a partial plan view of the vicinity of the breathable thin film of the embodiment shown in FIG. 4, respectively. be. DESCRIPTION OF SYMBOLS 1... Main body, 3... Sunlight, 4... Breathable thin film, 8... Air blower, 11... Heat utilization device, 14, 2
4, ... fin tube, 15 ... damper.

Claims (2)

[Claims] (1) A breathable thin film made of a single-layer or multi-layer wire mesh, carbon cloth, or any other porous material is exposed to sunlight and heated by solar heat, and air is perpendicularly directed over the entire surface of the breathable thin film. A solar heat collector configured to allow air to pass through the air, and thereby collect solar heat obtained by the air-permeable thin film into the passing air. (2) During sunshine, the air heated by the air-permeable thin film solar heat collector as set forth in claim (1) above is circulated and used as heat source air for an air-source heat pump for space heating; An air source heat pump configured to open an appropriate damper during sunshine to introduce fresh air from the outside and use it as the heat source air for the air source heat pump.