DE3325915A1 - Movable heat insulation for solar collectors - Google Patents

Abstract

Published without abstract.

Description

Movable thermal insulation for solar panels

The invention relates to the mobility of thermal insulation for solar collectors with the purpose / the absorber not only with sufficient solar and diffuse irradiation to avoid heat losses on the back, but also before cooling down and especially before freezing if the irradiation is too low for heat gain of the liquid heat transfer medium on the front (i.e. on the building's outer shell} to protect, with the possibility of automatic regulation and control the movement is both light and temperature dependent.

Flat-plate collectors for using solar energy usually have a permanently installed one Rear thermal insulation to reduce heat losses during operation. The one or multiple transparent covers on the front reduce heat losses due to convection and radiation to the outside during operation, however, they can also cool down quickly to temperatures below freezing point in particular do not prevent it in the winter nights. For this reason, can be used as a heat transfer medium from Liquid collectors are not just water, but just a water / antifreeze mixture or even a thermal oil can be used (which leads to significantly higher costs and . leads to a heat transfer in heat exchangers that drops to 0.7) or the Empty the absorber into a collecting vessel (which means additional pumping effort when filling and leads to a risk of corrosion in the absorber).

The movable thermal insulation, which is arranged on the rear side while the collector is in operation or is rolled up and in the former case (as usual) fulfills the purpose of thermal protection completely or in addition to static thermal insulation, can be pushed over the front of the absorber. It can be on either side attached to tapes with these run over rollers or like roller shutters in rails are performed (see. Fig. 1). Since the movable thermal insulation is still below the transparent Covering takes place (in the case of two, possibly in between), the insulation remains protected from wind and rain.

The advantage of this arrangement is that the absorber can now be used without hesitation, e.g. Heating water can be filled, so that not only the heat transfer The absorber / liquid is improved, but there is also no need for a heat exchanger when the solar energy is transferred to the heating water. The solar system can use the heating water can be operated in a single-circuit system.

In addition, the collector, which is usually integrated into the roof, comes on at the end of operation In the evening, the thermal energy stored in the collector benefits the building, and finally the absorber no longer has to be brought from such a low outside temperature by the sun to the useful temperature when it starts operating in the morning.

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Claims (2)

Claims J ο / O α I O Movable thermal insulation for solar collectors, characterized in that f 1)) insulation elements guided over rollers or rails optionally for - ^y protection against heat emission during operation on the rear of the absorber of a collector or for protection against frost and cooling in low light, especially at night, can be located on the front, 2) the regulation and, if necessary, also the control with the help of photovoltaic solar cells automatically with certain selected ones Irradiation values or with the help of heat sensors depending on the temperature of the circulating in the absorber liquid medium can be done. COPY