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DE3233081A1 - Simple trough-shaped mirror collector - Google Patents

Simple trough-shaped mirror collector

Info

Publication number
DE3233081A1
DE3233081A1 DE19823233081 DE3233081A DE3233081A1 DE 3233081 A1 DE3233081 A1 DE 3233081A1 DE 19823233081 DE19823233081 DE 19823233081 DE 3233081 A DE3233081 A DE 3233081A DE 3233081 A1 DE3233081 A1 DE 3233081A1
Authority
DE
Germany
Prior art keywords
mirror
collector according
trough
shaped mirror
trog
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19823233081
Other languages
German (de)
Inventor
Ulrich 8068 Pfaffenhofen Radons
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE19823233081 priority Critical patent/DE3233081A1/en
Publication of DE3233081A1 publication Critical patent/DE3233081A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
    • F24S80/50—Elements for transmitting incoming solar rays and preventing outgoing heat radiation; Transparent coverings
    • F24S80/54—Elements for transmitting incoming solar rays and preventing outgoing heat radiation; Transparent coverings using evacuated elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S23/74—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with trough-shaped or cylindro-parabolic reflective surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S23/80—Arrangements for concentrating solar-rays for solar heat collectors with reflectors having discontinuous faces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/20—Solar thermal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)

Abstract

The collector according to the invention is for the recovery of solar energy in the lower to middle temperature range. It can preferably be used for hot water preparation and for house heating. The usual flat collectors for this use range have large heat losses because of their large-surfaced absorbers. Trough-shaped mirror collectors described in the literature indeed reduce the heat losses in proportion to the heat radiating in, but are expensive because of their costly shaping and do not generally offer sufficient space for an additional vacuum insulation (Fig. 1). In the mirror collector according to the invention, the shaping is simplified, in contrast to the known systems, by flattening of the trough shape, and additional space is provided for adding a vacuum insulation (Fig. 2). With a concentration ratio according to the invention smaller than 2, this collector offers excellent acceptance of direct solar radiation. Considerable acceptance for diffuse radiation is also achieved. Radiation measurements and heating simulation computations have shown that with the mirror collectors according to the invention, solar houses can be built in Central Europe which are fully self-sufficient in heating and are also affordable. <IMAGE>

Description

Einfacher trogfoermiger Spiegelkollektor.Simple trough-shaped mirror collector.

Zur Reduzierung von Waermeverlusten bei Solarkollektoren werden in Literatur und anderen Patentschriften trogfoermige Spiegelkollektoren aehnlich Abb.l vorgeschlagen.bas Konzentrationsverhaeltnis wird relativ klein gewaehlt und die Absorberachse im albgemeinen waagerecht gelegt, sodass auf eine Nachfuehrung des Spiegels gemaess dem Sonnenstand ganz oder teilweise verzichtet werden kann. Zur Nutzung der flach entlang der Spiegelflanken einfallenden Strahlungsenergie wird unter dem Absorber eine Wulst angeordnet. Der Absorber wird in vielgestalti£er Form gezeigt.To reduce heat losses in solar collectors, in Literature and other patents trough-shaped mirror collectors similar to Fig.l suggested.based concentration ratio is chosen to be relatively small and the Absorber axis laid horizontally in the albgemeine, so that a tracking of the Depending on the position of the sun, the mirror can be completely or partially dispensed with. To the Use of the radiant energy incident flat along the mirror flanks a bead arranged under the absorber. The absorber comes in many forms shown.

Teilweise wird er zur Verringerung der konvektiven Waermeverluste mit einem Glasrohr umgeben in dem zur weiteren Verringerung der Konvektion ein Vakuum vorgeschlagen wird. Das Vakuum wird jedoch nur bei ausreichendem Abstand des Blasrohres vom Absorber wirksam ist daher bei dieser Spiegelform nur bei extrem grossen Kollektoren sinnvoll. Andere Literaturstellen schlagen deshalb anstelle der Wulst eine grabenfoermige Vertiefung unter dem Absorber vor, mit aehnlichen optischen Eigenschaften wie die Wulst, und schaffen so Platz fuer einen ausreichend breiten evakuierten Raum. Beide Loesungen haben den Nachteil. dass die Spiegelform kompliziert und seine Herstellung schwierig und materialaufwendig ist.In part, it is used to reduce convective heat losses surrounded by a glass tube in which to further reduce convection a vacuum is suggested. However, the vacuum is only achieved if the blowpipe is sufficiently distant from the absorber is therefore effective with this mirror shape only with extremely large collectors sensible. Other references therefore propose a trench-shaped one instead of the bead Indentation under the absorber in front, with similar optical properties as the Bulge, creating space for a sufficiently wide evacuated room. Both Solutions have the disadvantage. that the mirror shape is complicated and its manufacture is difficult and requires a lot of material.

Erfindungsgemaess wird die Formgebung daher durch Abflachen der Trogmulde vereinfacht (Abb.2). Bei dieser Form des Spiegels werden weder Wuelste noch Graeben erforderlich. Die Spiegeloberflaeche ist im Verhaeltnis zur Oeffnungsbrei klein und erfordert deshalb wenig Materialaufwand. Die Herstellung ist durch einfaches verspannen eines geraden Bleches ohne aufwendige Technologie leicht realisierbar. Technisch interessante Dicken des Vakuumringspaltes ergeben sich bei der erfindungsgemaessen Form ca. oberhalb 400 mm Trogbreite. Der Absorberdurchmesser liegt dabei oberhalb 70 mm.According to the invention, the shape is therefore made by flattening the trough trough simplified (Fig.2). With this form of the mirror there are neither ridges nor ridges necessary. The mirror surface is small in relation to the opening pulp and therefore requires little material expenditure. The manufacture is by simple Clamping a straight sheet is easy to implement without complex technology. Technically interesting thicknesses of the vacuum ring gap result from the one according to the invention Shape approx. Above 400 mm trough width. The absorber diameter is above 70 mm.

Zum verlustarmen Betrieb dieser relativ grossvolumigen Absorber wird erfindungsgemaess bei laengerem Ausbleiben der Sonnenstrahlung (z.B.nachts) die Absorberfluessigkeit in einen Speicher (z.B.den Hauptwaermespeicher) abgelassen. zu uf diese Weise entfallen Frostschutzmassmahmen und der Kollektor kann z.B. ohne Zwischenschalten von Waermetauschern direkt mit Wasser des Waermespeichers betrieben werden.This relatively large-volume absorber is used for low-loss operation according to the invention in the case of prolonged absence of solar radiation (e.g. at night) the The absorber fluid is drained into a storage facility (e.g. the main thermal storage facility). to be omitted in this way Frost protection measures and the collector can, for example, directly with water from the heat storage tank without the interposition of heat exchangers operate.

Der erfindungsgemaesse Kollektor ist besonders fuer eine ganzjaehrige solare Vollheizung mit besonders hohem Waermebedarf im Winter geeignet. Aus diesem Grunde empfielt es sich die Spiegelachse entsprechenct den niedrigen Sonnenstaenden im Winter mit einem flachen Neigungswinkel (ß) anzuordnen. Bei dem hohen Waermeangebot im Sommer kann hierbei im allgemeinen auf eine optimale Arbeitsweise des Kollektors verzichtet werden. Zur Vermeidung der Bildung einer Schneedecke im Winter soll die Glasabdeckung in einem steilen Winkel (y) angeordnet werden. LeerseiteThe collector according to the invention is particularly suitable for a year-round solar full heating with particularly high heat demand in winter suitable. For this Basically, it is recommended that the mirror axis correspond to the low sun positions to be arranged with a flat angle of inclination (ß) in winter. With the high supply of heat In the summer, this can generally mean that the collector works optimally be waived. To avoid the formation of a blanket of snow in winter, the Glass cover can be placed at a steep angle (y). Blank page

Claims (7)

Patentansprueche: S Trogfoermiger Spiegelkollektor vorzugsweise in horizontaler Ausrichtung des Troges,dadurch gekennzeichnet, dass die Spiegeloberflaeche kontinuierlich gleichsinnig gewoelbt ist und der Oeffnungswinkel(«)groesser als 700 ist und das Konzentrationsverhaeltnis(b/d,.R)kleiner als 2 ist.Claims: S trough-shaped mirror collector preferably in horizontal alignment of the trough, characterized in that the mirror surface is continuously curved in the same direction and the opening angle («) is greater than 700 and the concentration ratio (b / d, .R) is less than 2. 2. Trogfoermiger Spiegelkollektor nach Anspruch 1, dadurch gekennzeichnet, dass der Absorber selektiv beschichtet ist.2. Trog-shaped mirror collector according to claim 1, characterized in that that the absorber is selectively coated. 3. Trogfoermiger Spiegelkollektor nach Anspruch 1, dadurch gekennzeichnet, dass der Absorber mit einem Vakuumringspalt von mindestens 20 mm Dicke ausgeruestet ist, der so weit entlueftet ist, dass freie Konvektion unterdrueckt wird.3. Trog-shaped mirror collector according to claim 1, characterized in that that the absorber is equipped with a vacuum ring gap of at least 20 mm thickness that is so far vented that free convection is suppressed. 4. Trogfoermiger Spiegelkollektor nach Anspruch 1, dadurcn gekennzeichnet, dass das Spiegelsystem zur Vermeidung von Verschmutzung mit Glas abgedeckt ist.4. Trogfoermiger mirror collector according to claim 1, characterized dadurcn, that the mirror system is covered with glass to avoid contamination. 5. Trogfoermiger Spiegelkollektor nach Anspruch 1, dadurch gekennzeichnet, dass die Spiegelachse gemaess Abb.2 dem jeweiligen Verwendungszweck entsprechend im optimalen Neigungswinkelß) angeordnet wird.5. Trog-shaped mirror collector according to claim 1, characterized in that that the mirror axis according to Fig. 2 corresponds to the respective purpose is arranged at the optimal angle of inclination ß). 6. Trogfoermiger Spiegelkollektor nach Anspruch 1, dadurch gekennzeichnet, dass die Glasabdeckung zur Vermeidung einer Schneedecke im Winter mit einem steilen Winkel (y) angeordnet wird. 6. Trog-shaped mirror collector according to claim 1, characterized in that that the glass cover to avoid a blanket of snow in winter with a steep Angle (y) is arranged. 7. Regelung fuer eine Solaranlage mit Kollektor gemaess Anspruch 1, dadurch gekennzeichnet, dass die Absorberrohre bei Vorliegen adequater Waermeeinstrahlung gefuellt und bei laengerem Ausbleibt" adequater Waermeeinstrahlung wieder in einen waermeisolierten Speicher entleert werden. 7. Regulation for a solar system with collector according to claim 1, characterized in that the absorber pipes in the presence of adequate heat irradiation filled and if there is no adequate heat exposure again in one heat-insulated storage tank can be emptied.
DE19823233081 1982-09-06 1982-09-06 Simple trough-shaped mirror collector Withdrawn DE3233081A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19823233081 DE3233081A1 (en) 1982-09-06 1982-09-06 Simple trough-shaped mirror collector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19823233081 DE3233081A1 (en) 1982-09-06 1982-09-06 Simple trough-shaped mirror collector

Publications (1)

Publication Number Publication Date
DE3233081A1 true DE3233081A1 (en) 1983-05-11

Family

ID=6172574

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19823233081 Withdrawn DE3233081A1 (en) 1982-09-06 1982-09-06 Simple trough-shaped mirror collector

Country Status (1)

Country Link
DE (1) DE3233081A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1015824A1 (en) * 1997-09-19 2000-07-05 Solar Enterprises International, L.L.C. Nonimaging solar collector
ITMI20092063A1 (en) * 2009-11-24 2011-05-25 Polirim S R L SOLAR CONCENTRATION UNIT

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1015824A1 (en) * 1997-09-19 2000-07-05 Solar Enterprises International, L.L.C. Nonimaging solar collector
EP1015824A4 (en) * 1997-09-19 2001-05-16 Solar Enterprises Int Nonimaging solar collector
ITMI20092063A1 (en) * 2009-11-24 2011-05-25 Polirim S R L SOLAR CONCENTRATION UNIT

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Legal Events

Date Code Title Description
OAV Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1
8141 Disposal/no request for examination