DE10032227A1 - Solar collector protection and efficiency-increasing device comprises roller blind which can be raised or lowered - Google Patents

Abstract

A height-adjustable roller blind (2) is arranged over the solar collector (1), and has a reflective underside. When lowered and extended the blind protects the solar collector from too intense radiation and mechanical damage. When the blind is raised, it deflects additional radiation onto the collector.

Description

The use of solar collectors for the environmentally friendly production of Heat for domestic water and house heating is increasing steadily. Your commitment is economically given today.

Flat surfaces are used for private and municipal buildings Collectors (hereinafter referred to as K) as flat collectors or vacuum Tube collectors.

These K are constantly open and are weatherproof, above all large grain hail fully exposed. Your damage or Destruction - if you think of the storm of 1984 in the Munich area - is possible and always makes the owner fear.

If you use a larger surface to support the heating system, you get one often delivers too much heat in midsummer and that Heat transfer fluid evaporates. Malfunctions are often the result. If the roof pitch is low, the angle of the sun's rays is Winter or already in the transition period so flat that the yield No heat, especially with the much lower radiation Contributes significantly to energy savings in the household.

Any expansion of the collector area would be uneconomical and would only increase the "summer problem". You could use the K too make it standable and so the angle of inclination in the case of flat radiation increase to achieve a vertical impact. The moveable Line supply and the effort for a vigorous Adjustment mechanisms are expensive and prone to failure.

The exposure to radiation could be reduced by using mirrors increase a given area arbitrarily. Fixed permanent mirrors would be however, unattractive, expensive and stormy. In midsummer they only increase the risk of evaporation. Guided mirrors are found for commercial purposes and parabolic mirrors are used in so-called solar power plants.

According to the invention, the following arrangement has the disadvantages described eliminate and increase the performance of the existing collector:

As Figure 1 shows, a sun blind 2 made of mirror film is attached in a frame 3 above the fixed collector 1 . This frame is rotatably mounted in points 4 and can be raised in direction 5 with the help of an adjusting mechanism. When the blind is raised and the angle of attack is correct, the additionally collected radiation 6 is directed onto the surface. This almost doubles the radiation used.

In the summer months the K can be normal when the blind is retracted be used; If the radiation is too high, the amount of heat supplied can by partially closing the roller blind can be reduced up to extensive cessation of the activity of the collector when the Rollo. This prevents overheating - especially with highly efficient K - prevented. With this position you can go on vacation with peace of mind. , , A taut roller blind at a sufficient distance from the K protects it also with hailstorm. Such a roller blind is not in the usual sizes elevated position stormproof.

The blind can be closed automatically at Risk of evaporation or if the limitation of the Heat generation.

Figure 1 also shows an inexpensive and stable solution for setting up the blind:

At the other ends of the frame 3 there are laterally rollers 7 , via which the mirror film is pulled out by means of cables 8 , while the other end of the cables is simultaneously wound in opposite directions on the roller shaft ends 9 . To compensate for changes in length, the cables are attached to the foil end rail 10 via springs.

The roller blind is adjusted in height by means of rotatable arms 11 which have rollers 12 at their ends, which run in grooves in the side struts of the frame 3 .

Two radiation measuring cells 13 attached to the lower end of the K control the optimal angle of inclination of the mirror in that the lower cell receives less light and the upper one more.

Claims (5)

1. Arrangement for protecting and increasing the efficiency of flat solar collectors, characterized in that above the solar collector, a roll-up roller blind that is mirrored on the underside is arranged, which - when extended - protects the collector in the lowered position from excessive radiation and mechanical damage, and one with the roller blind raised up directs additional radiation onto the collector. 2. Claim according to 1, characterized in that the roller blind in two layers from possibly diffuse reflective fabric and an underlying mirror film is. 3. Claim according to 1, characterized in that the roller blind via cables is pulled out, which is attached to the bottom of the blind by means of springs and are wound in opposite directions on the roller blind shaft. 4. Claim according to 1, characterized in that the superscript of Roller frame made by laterally rotatable levers at the ends existing rollers run in grooves in the side parts of the roller frame. 5. Claim according to 1, characterized in that as a measured variable for the optimal angle of attack the position of the reflecting light beam of the upper Mirror edge to the lower edge of the solar collector is detected.