DE3018024A1 - Solar collector which heats air esp. for crop drying - has controlled recycling to maintain uniform conditions - Google Patents
Solar collector which heats air esp. for crop drying - has controlled recycling to maintain uniform conditionsInfo
- Publication number
- DE3018024A1 DE3018024A1 DE19803018024 DE3018024A DE3018024A1 DE 3018024 A1 DE3018024 A1 DE 3018024A1 DE 19803018024 DE19803018024 DE 19803018024 DE 3018024 A DE3018024 A DE 3018024A DE 3018024 A1 DE3018024 A1 DE 3018024A1
- Authority
- DE
- Germany
- Prior art keywords
- collector
- air
- esp
- solar collector
- maintain uniform
- 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- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S50/00—Arrangements for controlling solar heat collectors
-
- 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)
- Drying Of Solid Materials (AREA)
Abstract
Description
SOLARER LUFTKOLLEKTOR MIT TEMPERATURREGELUNGSOLAR AIR COLLECTOR WITH TEMPERATURE CONTROL
Solare Luftkollektoren aus Plastikfolien- können einerseits für die Erzeugung von Warmluft für Trocknung von Feldfrüchten oder für Raumheizung verwandt werden, andererseits über einen Luft/Wasser-Wärmetauscher auch zur Wassererwärmung dienen.Solar air collectors made of plastic sheeting can be used for the one hand Generation of warm air used for drying crops or for space heating on the other hand via an air / water heat exchanger to heat the water to serve.
In beiden Fällen ist eine Regelung der Temperatur der austretenden Luft wün schenswert. Beim Trocknen von Feldfrüchten, Gewürzen und dergleichen ist meist eine obere Grenze gesetzt, um eine Schädigung des Trocknungsguts zu vermeiden. Andererseits ist es wünschenswert, die Lufttemperatur in einem engen Intervall unterhalb der Maximaltemperatur zu halten, -um so den Trocknungsvorgang durch hohe Diffusionsgeschwindigkeit im Trocknungsgut und durch hohe Feuchtigkeitsaufnahme der Luft zu beschleunigen.In both cases there is a regulation of the temperature of the exiting Air is desirable. When drying crops, spices and the like is usually an upper limit is set in order to avoid damage to the items to be dried. On the other hand, it is desirable to keep the air temperature in a narrow interval below the maximum temperature to keep the drying process through high diffusion speed to accelerate in the goods to be dried and by the high moisture absorption of the air.
Auch beim Erwärmen von Wasser über einen Wärme tausch er ist eine Regelung der Luftaustrittstemperatur aus dem Kollektor wichtig, da sonst bei nachlassender Einstrahlung und bereits erhöhter Wassertemperatur der Luftstrom abgeschaltet werden muss, um eine Abkühlung des Wassers zu verhindern. Dies bedeutet, dass die verbleibende Einstrahlung nicht mehr genutzt werden kann.It is also used when heating water by means of a heat exchange Regulation of the air outlet temperature from the collector is important, otherwise it will decrease Irradiation and already increased water temperature, the air flow can be switched off must to prevent the water from cooling down. This means that the remaining Irradiation can no longer be used.
Es ist aus diesem Grunde schon eine Regelung der Luftaustrittstemperatur durch eine Veränderung des Luftdurchsatzes durch den Kollektor vorgeschlagen worden in dem Sinne, dass bei sinkender Einstrahlung der Luftdurchsatz verringert wird, um so die Luftemperatur auf konstantem Niveau zu halten. Diese Methode hat jedoch den grossen Nachteil, dass bei den zwangsläufig sinkenden Luftgeschwindigkeiten im Kollektor auch dessen Wirkungsgrad sinkt, also keine proportionale Temperaturerhöhung eintritt. Dies bedeutet nicht nur einen Energieverlust, sondern daneben ein ungünstiges Regelverhalten.For this reason it is already a regulation of the air outlet temperature by changing the air flow through the collector in the sense that with decreasing irradiation the air throughput is reduced, in order to keep the air temperature at a constant level. However, this method has the big disadvantage that with the inevitably falling air velocities in the collector its efficiency also decreases, i.e. no proportional increase in temperature entry. This means not only a loss of energy, but also an unfavorable one Control behavior.
Erfindungsgemäss kann eine Regelung ohne Energieverlust dadurch erreicht werden, dass bei gleichbleibendem Luftdurchsatz durch den Kollektor durch eine Verbindung zwischen seiner Eintritts- und Austrittsseite und Einbau von einem oder mehreren Ventilen ein einstellbarer Teil der aus dem Kollektor austretenden Luft zur Eintrittsseite und von dort in den Kollektor zurückgeführt wird, wodurch eine entsprechende Temperaturerhöhung bei gleichbleibendem Wirkungsgrad erreicht wird. Der geringeren Einstrahlung entspricht eine geringere aus dem Kollektor entnommene Luftmenge. Die Steuerung des im Kreise geführten Anteils der Luft erfolgt durch Temperaturfühler in dem aus dem Kollektor austretenden Luftstrom und (bei Wassererhitzung) in dem Wasservolumen im Warmetauscher.According to the invention, regulation can thereby be achieved without loss of energy that with constant air flow through the collector through a connection between its entry and exit side and installation of one or more Valves an adjustable part of the air exiting the collector to the inlet side and from there is returned to the collector, causing a corresponding increase in temperature with constant Efficiency is achieved. The lesser one Irradiation corresponds to a smaller amount of air extracted from the collector. the The proportion of air that is circulated is controlled by temperature sensors in the air flow emerging from the collector and (in the case of water heating) in the Water volume in the heat exchanger.
Bei der Querverbindung von Ein- und Austrittsseite des Kollektors muss durch entsprechende Dimensionierung der Querschnitte aller luftdurchströmten Teile Sorge getragen werden, dass über die ganze Länge des Plastikkollektors der Innendruck grösser als der Aussendruck ist, um so Querschnittsverengungen und daraus folgende Luft-Geschwindigkeitsveränderungen im Kollektor zu vermeiden. Dies kann vorteilhaft durch die Regelventile selbst erreicht werden. Es können, je nach geforderter Re gel qualität, drei, zwei, oder auch nur 1 Ventil verwandt werden.When connecting the inlet and outlet side of the collector must be by appropriate dimensioning of the cross-sections of all air flow Care must be taken that over the entire length of the plastic collector's parts Internal pressure is greater than the external pressure, all the more constrictions in the cross-section and from this to avoid the following changes in air speed in the collector. This can can advantageously be achieved by the control valves themselves. It can, depending on what is required As a rule, three, two or even only 1 valve can be used.
Werden zwei oder drei Ventile verwandt, können sie vorteilhaft über einen Antrieb ges teuert werden.If two or three valves are used, they can be advantageous over a drive can be controlled.
Fig. 1 zeigt eine Lösungsmöglichkeit für einen Lufterhitzer. Hier bewirken drei auf einer Achse sitzende Klappen ein abgestimmtes Öffnen und Schllessen tjt?r Ein- und Austrittskanäle sowie der Querverbindung.Fig. 1 shows one possible solution for an air heater. here three flaps on one axis cause coordinated opening and closing tjt? for inlet and outlet channels as well as the cross connection.
Fig. 2 zeigt eine Lösung für einen Luftkollektor mit Wärmetauscher, bei dem drei getrennte, aber gemeinsam angetriebene Ventile verwandt werden.Fig. 2 shows a solution for an air collector with heat exchanger, in which three separate but jointly driven valves are used.
L e e r s e i t eL e r s e i t e
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19803018024 DE3018024A1 (en) | 1980-05-10 | 1980-05-10 | Solar collector which heats air esp. for crop drying - has controlled recycling to maintain uniform conditions |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19803018024 DE3018024A1 (en) | 1980-05-10 | 1980-05-10 | Solar collector which heats air esp. for crop drying - has controlled recycling to maintain uniform conditions |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3018024A1 true DE3018024A1 (en) | 1981-11-12 |
Family
ID=6102127
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19803018024 Withdrawn DE3018024A1 (en) | 1980-05-10 | 1980-05-10 | Solar collector which heats air esp. for crop drying - has controlled recycling to maintain uniform conditions |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3018024A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19508400A1 (en) * | 1995-03-09 | 1996-09-12 | Gresp Solare Trocknungs Gmbh | Drying assembly incorporates solar-powered air heaters located in series and parallel |
-
1980
- 1980-05-10 DE DE19803018024 patent/DE3018024A1/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19508400A1 (en) * | 1995-03-09 | 1996-09-12 | Gresp Solare Trocknungs Gmbh | Drying assembly incorporates solar-powered air heaters located in series and parallel |
DE19508400B4 (en) * | 1995-03-09 | 2011-07-07 | GRAMMER Solar GmbH, 92224 | Device for drying moist material |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8130 | Withdrawal |