DE3521448A1 - Solar cooler - Google Patents

Abstract

Solar cooler according to a periodical sorption cycle with a solar collector, filled with zeolite, two air-cooled condensers, two alternately cooled ice containers for producing and storing ice. Via a switch-over member, one ice container is in each case separated from the sorption cycle. The ice stored in it can be used for cooling purposes.

Description

DR.RETER-MA ^ ER-LAX-HUBER DIPL.-ING. FRITZ J. KAUBEK

SOCIETY FOR INNOVATION RESEARCH AND DEVELOPMENT

3521U8

SAUMWEBERSTRASSE D-8OOO MUNICH TELEPHONE (O 89) 8 34 67

Heilmannstrasse

D-8OOO MUNICH TELEPHONE (089) 79 2697

KML 010

SOLAR COOLER

The invention relates to a solar-powered adsorption cooler according to the preamble of claim 1.

The use of solar energy is only possible via sorption cooling processes without energy conversion losses. In the professional world, two processes are primarily considered to be promising (see, for example, BPJ Wilbur et. Al. Solarenergie, volume 18 / page 5 69 to 5 ^ 6, Pergamonpress 1976). It concerns the continuously working sorption processes with the material pairings LiBr / water and water / ammonia, whereby higher efficiencies are expected from the former. Since solar heat is only available as primary energy during the day, but the cooling effect is also necessary in the evening and at night, either the primary energy or the cold generated must be stored in separate system components. This takes place on the primary energy side in hot oil or water storage tanks and on the cold side in the form of cold water or in the form of temporarily stored refrigerants. The conversion of solar energy to primary energy for the sorption process takes place either in coated flat-plate collectors or by means of concentrating systems. The process waste heat is in the

STADTSPARKASSE MUNICH. KTO-NR 1 7 84 59 'BLZ 7O1 BOOOO) BANK REUSCHEL a CO. KTO-NR 1 O 88 31 2 CBLZ 7OO303O0)

DR. PETER MAIER-LAXMUBiER DIPL.-ING. FRITZ J. XAU) BEK

3521U8

As a rule of cooling water, which has to be re-cooled in special cooling towers / given off. A release of heat into the air significantly reduces the performance of the systems. At extremely high ambient temperatures is a smooth Functional sequence not guaranteed.

In addition to the actual sorption apparatus, a sometimes considerable technical effort is therefore required for the Storage of primary energy or cold required. For driving solvent pumps or environmental and Mechanical auxiliary energies are indispensable for feed pumps. Solar-powered sorption devices are not economical due to the high technical complexity.

The object of the invention is to provide an economical solar-powered adsorption apparatus.

The object is achieved in that a periodically operating zeolite sorption apparatus with a solar collector is coupled directly. The entire sorption apparatus consists of the solar collector, which with the pair of substances zeolite / water is filled, a switching device, first and second air-cooled condensers and first and second ice buckets. at Solar radiation on the solar collector is expelled from the zeolite filling water vapor, in a first liquefied air-cooled condenser and collected as condensate in a first ice container. At times when there is no sunlight the zeolite filling cools down and sucks in water vapor from the first ice container. The condensate This cools down and finally freezes to ice. If there is renewed exposure to the sun, first aid of the switching device, the steam path from the solar collector to the first condenser and to the second condenser is closed and ice bucket opened. The now from the

DR. PETER MAIER-LAXhtiDBER

DIPL.-ING. FRITZ J. ^ AUBEK - page

3521U8

Vapor expelled from the zeolite filling condenses in the second condenser and drips into the second ice container. This process has no effect on the ice filling in the first ice container. With the now following As the solar collector cools down, steam from the second ice container is adsorbed. As a result of the evaporation process, its water filling also freezes to ice.

The cold stored in the two ice containers can be extracted via heat exchangers. With the invention Solar cooler, permanent use of the incident solar radiation is possible. The generated cold is stored in the ice containers in the form of ice and can also be removed with a very high output if required.

The alternating heating and cooling of the necessary for every periodic sorption process Zeolite filling is completely self-regulating. During the day, the zeolite filling is caused by solar radiation heated, cooled at night by radiation and heat conduction to the environment. Additional cooling or heating systems are not necessary. The heat of condensation can also be transferred to the Ambient air can be discharged. Mounting the capacitors in the shadow of the collector is completely sufficient. The Umschaüforgan can from thermostatically controlled Valves exist. Additional auxiliary energies can then be dispensed with entirely. The solar cooler can be manufactured, filled, evacuated and transported as a complete unit. Are on site just align the solar collectors with the optimal direction of solar radiation and the ice containers to be connected to the existing cooling system.

The drawing shows an embodiment of the invention. The solar collector consists of curved mirrors 1, the

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'DIPL.-ING. FRITZ J. ΚΑΰ.ΒΕΚ. page

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collimate the incident sunlight on the tubes 3 filled with zeolite 2. Lead from tubes 3 Steam channels to a switching element 4, which the steam path to one of the two air-cooled Capacitors 5 releases or closes. The capacitors 5 open into two insulated ice containers 6, the two heat exchangers 7 and a larger water supply included.

Claims (8)

To you. PETER? ^ AIiER-'LA * XHXJBER UlPL-ING. '"FRITZ J. KAUBEK SOCIETY FOR INNOVATION RESEARCH AND DEVELOPMENT SAUMWEBERSTRASSE D-8OOO MUNICH TELEPHONE (O 89) 8 34 67 D-8OOO MUNICH TELEPHONE (089) 792697 Solar cooler 14-, 06.1985 Claims Solar cooler off ~ a solar collector filled with an adsorbent for the alternating adsorption and desorption of working fluid vapor, two air-cooled condensers, two ice buckets and a switching device, characterized in that - that the two capacitors via the switching device alternatively connected to the solar collector and an insulated ice container to each condenser connected. 2. Solar cooler according to claim 1, characterized, - That zeolites of type A, X or Y are used as adsorbents and water can be used as the working medium. STADTSPARKASSE; MUNICH. KTO-NR 17 84 59 (HlV 7OI '»OOOOi BANKHAUS RElUSCHtL Ht CO. ACCOUNT NO. 1ΟΘΘ312 (RHI / 7OO l DR. PETER MAIER-LÄXHUBER DIPL.-ING. FRITZ J. KAU ^- BEK -. .. ' Page 3521U8 3. Solar cooler according to claim 1 / characterized in that - That the solar collector is designed as a collimating system. 4. Solar cooler according to claim 1, characterized in that - That the adsorbent is housed in a glass tube is. 5. Solar cooler according to claim 4, characterized in - that the adsorbent is black or additionally contains light-absorbing substances. 6. Solar cooler according to claim 1, characterized in that - That the switching element consists of a 3-way valve. 7. Solar cooler according to claim 1, characterized in that - That the switching element consists of two thermostatic valves. 8. The method for operating the solar cooler according to claim 1, characterized, - That the adsorbent is heated by solar radiation to temperatures above 130 ⁰ C and can cool down at night by heat radiation.