DE202010010835U1 - Full aluminum absorber for heat generation from sunlight for use with solar collectors - Google Patents

Abstract

Full aluminum absorber for heat generation from sunlight for use in solar collectors, characterized in that the collecting (1) and harp channels (2) consist of Aluminiumstrangpressprofielen.

Description

in the The present text will be a full aluminum collector and its production process described. The term all-aluminum refers here on the absorber material (area, which absorbs the sunlight including the flow channels for the heat transfer medium).

solar panels serve for heat generation from sunlight. The absorbed solar energy is in the form of Heat on an i. d. R. delivered under the absorber surface in channels flowing heat transfer medium, which turn the heat energy by means of heat exchanger then to a buffer memory. The store in turn serves Stations with hot water, which is needed for showering and bathing, or can also serve for heating support.

Current State of the art in collectors for use in solar thermal Use are collectors, the absorber made of solid copper (copper sheet and copper round tube) or copper-aluminum (Aluminum sheet and copper round tube) use. The sheet is with the Circular tube mostly connected by ultrasonic or laser welding. Others too Methods such as soldering, Seam welding Clinching, etc. are used in very small percentage proportions to connect sheet metal and round tube.

copper has a high thermal conductivity is thus suitable for this Application. Also aluminum has one high thermal conductivity. reasons the for an execution of the absorber of all-aluminum, are the lower specific Weight of aluminum, bypassing different expansion coefficients, higher Commodity prices of copper (LME quotations), as well as the larger deposits of raw materials of aluminum.

Now there is full aluminum absorber for quite some time, z. B. in the execution as Rollbond absorber. These are two aluminum plates, the whole area together Sweat-welded under high pressure become. The intended flow channels are previously treated so that no welding occurs at these locations. Subsequently becomes an "inflation" of the absorber under atmospheric pressure carried out. The thus resulting channels serve the flow guidance of the Heat transfer medium. The flow channels are largely freely selectable.

Of Further there is the possibility a full aluminum absorber by welding an aluminum sheet and a Alurohres produce. The welding is usually done via ultrasonic or laser welding reached. Also clamping, soldering, Friction welding etc. are used occasionally.

The subsequently described method shows another way of making a Full aluminum absorber on.

1 schematically shows the construction of a harp absorber. The main components of the absorber consist of extruded aluminum profiles. A number x of the same extruded profiles ( 3 ) the harps ( 2 ), two further extruded profiles ( 4 ) the two collection channels ( 1 ). Via a groove and spring system ( 3 ), the harp profiles are jammed together, making the absorber stiffer.

The harp profiles are combined with the collecting channel profiles via hollow pins ( 2 - Detail A) pressed form-fitting and thus connected. The resulting connection can no longer be solved without destroying it. The resulting absorber has decisive advantages in terms of production and material properties. The welding process, which connects according to the prior art sheet and tube can be omitted. A soldering of collection channel and harp can also be omitted. As a result, no additional heat input takes place. In particular, heat-affected zones, the resulting material stresses and material mixtures can be avoided here.

absorber in the prior art made of welded copper sheet and copper pipe or aluminum sheet and copper pipe are also the problem that at the ultrasonic or laser welding a punctiform, at best a linear one Connection between sheet metal and pipe is created. The heat flow is not optimal here. Furthermore, there is the danger of constant Cycles of warming and cooling, that welds to solve. This danger is with different material combinations, such as bigger with aluminum sheet and copper pipe, there different thermal expansion coefficients cause a relative movement.

At the The system described here, on the other hand, becomes the heat due to the profile geometry better to the heat transfer medium directed. Furthermore, there is no danger that connecting points between absorber plate and pipe would solve, since it is an extruded profile is.

1

collecting duct

2

harp

3

Harp profile

4

Collecting duct profile

5

hollow pin

6

entry Heat transfer fluid

7

exit Heat transfer fluid

Claims (8)

Full aluminum absorber for heat generation from sunlight for use in solar collectors, characterized in that the collection ( 1 ) and harp channels ( 2 ) consist of extruded aluminum profiles. All-aluminum absorber according to claim 1, characterized in that the collection ( 4 ) and harp profiles ( 3 ) by hollow pins ( 5 ) are pressed together. All-aluminum absorber according to one of the preceding claims, characterized in that the harp profiles by a tongue and groove system ( 3 - Detail B) can be clamped together. Full aluminum absorber according to one of the preceding Claims, characterized in that the collection and harp profiles a dip are provided with a selective coating. Full aluminum absorber according to one of the preceding Claims, characterized in that the surface of the harp profiles before selective coating by means of etching is roughened. Full aluminum absorber according to one of the preceding Claims, characterized in that the flow channels in both extruded profiles can deviate from the circular shape. Full aluminum absorber according to one of the preceding Claims, characterized in that by different length of the Harp profiles and forming of the collecting channel profile most diverse Geometries of the absorber can be realized. Full aluminum absorber according to one of the preceding Claims, characterized in that the absorber be convex or concave can.