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DE19831147A1 - Re-charging control for solar hot-water collector - Google Patents

Re-charging control for solar hot-water collector

Info

Publication number
DE19831147A1
DE19831147A1 DE19831147A DE19831147A DE19831147A1 DE 19831147 A1 DE19831147 A1 DE 19831147A1 DE 19831147 A DE19831147 A DE 19831147A DE 19831147 A DE19831147 A DE 19831147A DE 19831147 A1 DE19831147 A1 DE 19831147A1
Authority
DE
Germany
Prior art keywords
temperature
change
solar
control according
temperature difference
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.)
Granted
Application number
DE19831147A
Other languages
German (de)
Other versions
DE19831147C2 (en
Inventor
Andreas Warzecha
Rudolf Klein
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.)
Robert Bosch GmbH
Original Assignee
Buderus Heiztechnik GmbH
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 Buderus Heiztechnik GmbH filed Critical Buderus Heiztechnik GmbH
Priority to DE19831147A priority Critical patent/DE19831147C2/en
Publication of DE19831147A1 publication Critical patent/DE19831147A1/en
Application granted granted Critical
Publication of DE19831147C2 publication Critical patent/DE19831147C2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/04—Gas or oil fired boiler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/14—Solar energy
    • 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
    • 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
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

Where there is insufficient energy supply through the solar unit, re-charging is effected by a heating boiler controlled by a collector-minimum temperature. The difference between the collector's minimum temperature and an adjusted collector-nominal temperature increases from low values with a low output from the solar plant to higher values with higher yields from the solar plant. The temperature difference is changed by changing the collector's minimum temperature, dependent on external temperature.

Description

Die Erfindung betrifft die Nachladesteuerung eines Solar-Warmwasserspeichers nach dem Oberbegriff des Patentanspruches 1.The invention relates to the recharge control of a solar hot water tank the preamble of claim 1.

Solar-Warmwasserspeicher nehmen die während der täglichen Sonnenscheindauer nutzbare Sonnenenergie auf. Damit auch in Tageszeiten ohne eine ausreichende Zu­ fuhr von Sonnenenergie ein nutzbares Energiepotential im Warmwasserspeicher vor­ handen ist, erfolgt bei Bedarf ein Nachladen durch einen Heizkessel anhand einer auf die Kesselsteuerung einwirkenden Speicher-Mindesttemperatur. Infolge dieses Nach­ ladens kann der Warmwasserspeicher über den ganzen Tagesverlauf eine ausrei­ chende Menge an warmem Wasser zur Verfügung stellen.Solar hot water tanks take that during the daily sunshine period usable solar energy. So even in the daytime without an adequate closing demonstrated a usable energy potential in the hot water tank from solar energy is available, reloading is carried out by a boiler if necessary the minimum store temperature acting on the boiler control. As a result of this after the hot water storage tank can be used throughout the day Provide a sufficient amount of warm water.

Es ist wichtig, daß immer vorrangig die Sonnenenergie zum Aufheizen des Speicher­ wassers benutzt wird, und daß das Nachladen durch den Heizkessel nur dann erfolgt, wenn es unbedingt erforderlich ist. So hat man schon zeitliche Begrenzungen für das Nachladen vorgeschlagen, etwa dann, wenn trotz eines Startbefehles für den Heiz­ kessel in Anlehnung an das Geschehen am vorherigen Tag mit einem baldigen Star­ ten der Solaranlage zu rechnen ist (DE 43 33 506 C1), oder wenn ein Rechner fest­ stellt, daß die vorgegebene Solltemperatur bis zum Beginn der Hauptwasserentnahme durch die bis dahin noch hinzuzufügende Sonnenenergie erreicht werden kann (DE 195 24 352 A1).It is important that the solar energy is always used to heat the storage water is used and that the boiler only reloads if it is absolutely necessary. So you already have time limits for that Reloading suggested, for example, if, despite a start command for the heating kessel based on what happened the previous day with an upcoming star ten of the solar system is to be expected (DE 43 33 506 C1), or if a computer is fixed represents that the specified target temperature until the start of the main water withdrawal can be achieved by the solar energy to be added up to that point (DE 195 24 352 A1).

Der Erfindung liegt die Aufgabe zugrunde, den Vorrang der Solarnutzung gegenüber dem Nachfaden durch den Heizkessel noch weiter zu steigern.The invention has for its object the priority over the use of solar to increase the thread through the boiler even further.

Die erfindungsgemäße Nachladesteuerung besitzt die im Patentanspruch 1 genann­ ten Merkmale.The reload control according to the invention has the so-called in claim 1 characteristics.

Während man bisher daran dachte, den Startbeginn für das Nachladen zeitweise zu überbrücken, wird jetzt die Differenz zwischen der Speicher-Mindest- und Solltempe­ ratur in Abhängigkeit von den zu erwartenden oder tatsächlichen Solarerträgen verän­ dert, und zwar derart, daß sie während größerer Erträge der Solaranlage größer ist als während niedrigerer Erträge. Eine solche Vergrößerung der Temperaturdifferenz wäh­ rend der Betriebsphase der Solaranlage sorgt dafür, daß eine wesentlich größere Speicherkapazität für Solarenergie vorhanden ist, als es bisher der Fall war, weil der Startbeginn des Brenners deutlich verzögert wird und weil über der durch den Brenner garantierten Stütztemperatur noch eine ausreichende Temperaturspanne für die Auf­ nahme von Solarenergie verbleibt.While people had previously thought of temporarily starting the reload start bridge the difference between the minimum and target temperature rature depending on the expected or actual solar yield changes, in such a way that it is greater than during larger yields of the solar system during lower yields. Such an increase in the temperature difference rend the operating phase of the solar system ensures that a much larger Storage capacity for solar energy is present than was previously the case Start of the burner is significantly delayed and because of the burner guaranteed support temperature still a sufficient temperature range for the opening solar energy remains.

Durch ein Vergrößern der Temperaturdifferenz über ein außentemperaturabhängiges Absenken der Speicher-Mindesttemperatur bei gleichbleibender Speicher- Solltemperatur wird der Startbefehl für das Nachladen durch den Heizkessel während der Betriebsphase der Solaranlage deutlich verzögert. Somit wird die Nutzung der Sonnenenergie vergrößert. Bei Untersuchungen wurde festgestellt, daß die Deckungs­ rate der Solaranlage auf diese Weise wirkungsvoll um etwa 5-10% gesteigert werden kann.By increasing the temperature difference over an outside temperature dependent Lowering the minimum tank temperature while maintaining the The target temperature is the start command for the boiler to reload during significantly delayed the operating phase of the solar system. Thus, the use of the Increased solar energy. Research has shown that the coverage rate of the solar system effectively increased by about 5-10% can be.

Man könnte die Veränderung der Temperaturdifferenz über den Tagesverlauf analog den zu erwartenden Außentemperaturen fest einprogrammieren. Noch günstiger ist es jedoch, wenn diese Veränderung anhand der tatsächlich vorliegenden Außentempe­ raturen selbsttätig erfolgt. Dabei können zusätzliche Sonderfunktionen berücksichtigt werden, die in den Unteransprüchen 3 bis 6 aufgeführt sind. One could analog the change in temperature difference over the course of the day firmly program the expected outside temperatures. It is even cheaper however, if this change is based on the actual outdoor temperature instrumentation takes place automatically. Additional special functions can be taken into account that are listed in subclaims 3 to 6.  

Es empfiehlt sich, während der Stillstandsphase der Solaranlage mit der bisher übli­ chen, niedrigen Temperaturdifferenz von etwa 5 K zu arbeiten, damit die gewünschte Speicher-Solltemperatur durch ein kontinuierliches Nachladen über den Heizkessel garantiert wird, und diese Temperaturdifferenz während der Betriebsphase der So­ laranlage auf Werte von etwa 20-25 K anzuheben. Die Solaranlage hat jetzt wesent­ lich mehr Zeit, Energie einzuspeisen, bevor das Nachladen über den Heizkessel be­ ginnt.It is advisable to use the previously usual one during the standstill phase of the solar system Chen, low temperature difference of about 5 K to work so the desired Target tank temperature through continuous reloading via the boiler is guaranteed, and this temperature difference during the operating phase of the Sun. Raise the lar system to values of around 20-25 K. The solar system is now essential more time to feed in energy before reloading via the boiler starts.

Die Zeichnung stellt in den Diagrammen a-e mehrere Funktionsschemen der Erfin­ dung dar.In the diagrams a-e, the drawing shows several functional diagrams of the Erfin dung.

a: Die Differenz zwischen der Speicher-Mindesttemperatur und der Speicher- Solltemperatur liegt vom späten Nachmittag (etwa 17.00 Uhr) bis zum frühen Morgen (etwa 6.00 h), d. h. während der Stillstandszeit der Solaranlage, bei et­ wa 5 K. Sie steigt dann außentemperaturabhängig auf etwa 20-25 K an, um erst am späten Nachmittag wieder abzufallen. Auf diese Weise ist ein größeres Einspeisepotential während der Betriebsphase der Solaranlage gegeben.a: The difference between the minimum storage temperature and the storage The target temperature is from late afternoon (around 5:00 p.m.) to early Tomorrow (around 6:00 a.m.) H. during the downtime of the solar system, at et wa 5 K. It then rises to around 20-25 K depending on the outside temperature to fall off again only in the late afternoon. That way is a bigger one Feed-in potential given during the operating phase of the solar system.

b: Man kann die Schwankung der Außentemperatur zwischen Tag und Nacht als Ergänzungsfaktor einfließen lassen.b: One can see the fluctuation in outside temperature between day and night Allow the supplementary factor to flow in.

c: Man kann dabei die Anstiegs- und Abfallgeschwindigkeit der Außentemperatur berücksichtigen.c: You can see the rate of rise and fall of the outside temperature consider.

d: Die Speicher-Mindesttemperatur kann in Abhängigkeit vom Benutzerverhalten, d. h. ob er viel oder wenig Wärme dem Warmwasserspeicher entnimmt, in der Höhe frei eingestellt werden.d: Depending on user behavior, the minimum storage temperature can d. H. whether he takes a lot or little heat from the hot water tank in the Height can be set freely.

e: Durch die Auswertung des Strahlungsertrages kann der Zeitpunkt der Verände­ rung der Speicher-Mindesttemperatur und damit der Temperaturdifferenz ein­ gestellt werden.e: The time of the changes can be determined by evaluating the radiation yield minimum storage temperature and thus the temperature difference be put.

Claims (7)

1. Nachladesteuerung eines Solar-Warmwasserspeichers anhand einer bei nicht ausreichender Energiezufuhr durch die Solaranlage das Nachladen durch einen Heizkessel steuernden Speicher-Mindesttemperatur, dadurch gekennzeichnet, daß die Differenz zwischen der Speicher-Mindesttemperatur und einer eingestellten Speicher-Solltemperatur von niedrigeren Werten bei geringen Erträgen der Solaranlage auf höhere Werte bei größeren Erträgen der Solaranlage ansteigt.1. Reload control of a solar hot water tank based on a recharge by a boiler controlling the store temperature when there is insufficient energy supply by the solar system, characterized in that the difference between the store minimum temperature and a set store temperature of lower values with low yields Solar system rises to higher values with greater yields from the solar system. 2. Nachladesteuerung nach Anspruch 1, dadurch gekennzeichnet, daß die Veränderung der Temperaturdifferenz durch eine außentemperaturabhängige Veränderung der Speicher-Mindesttemperatur erfolgt.2. reload control according to claim 1, characterized in that the change in temperature difference by a outside temperature-dependent change of the minimum storage temperature takes place. 3. Nachladesteuerung nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß zusätzlich die Schwankung der Außentemperatur zwi­ schen Tag und Nacht auf die Veränderung der Temperaturdifferenz einwirkt.3. reload control according to claims 1 and 2, characterized in that in addition the fluctuation in the outside temperature between day and night affects the change in temperature difference. 4. Nachladesteuerung nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß zusätzlich die Anstiegs- und die Abfallgeschwindigkeit der Außentemperatur auf die Veränderung der Temperaturdifferenz einwirkt.4. reload control according to claims 1 to 3, characterized in that in addition the rate of rise and fall the outside temperature affects the change in temperature difference. 5. Nachladesteuerung nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß zusätzlich der Speicherlade- und -entladerhythmus, d. h. das Nutzungsverhalten des Anwenders, auf die Veränderung der Temperaturdifferenz einwirkt. 5. reload control according to claims 1 and 2, characterized in that, in addition, the store loading and unloading rhythm, d. H. the usage behavior of the user, on the change in temperature difference acts.   6. Nachladesteuerung nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß zusätzlich der Strahlungsertrag, d. h. der frühest mögli­ che und spätest noch zu erzielende Solarertrag, auf den Zeitpunkt der Veränderung der Temperaturdifferenz einwirkt.6. reload control according to claims 1 and 2, characterized in that in addition the radiation yield, d. H. the earliest possible che and latest solar yield to be achieved, at the time of the change the temperature difference acts. 7. Nachladesteuerung nach Anspruch 1, dadurch gekennzeichnet, daß die Temperaturdifferenz während der Stillstandsphase der Solaranlage etwa 5 K beträgt, und daß sie während der Betriebsphase der So­ laranlage auf etwa 20-25 K ansteigt.7. reload control according to claim 1, characterized in that the temperature difference during the standstill phase the solar system is about 5 K, and that during the operating phase of the Sun. Lar system increases to about 20-25 K.
DE19831147A 1998-07-11 1998-07-11 Reload control of a solar hot water tank Expired - Lifetime DE19831147C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19831147A DE19831147C2 (en) 1998-07-11 1998-07-11 Reload control of a solar hot water tank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19831147A DE19831147C2 (en) 1998-07-11 1998-07-11 Reload control of a solar hot water tank

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DE19831147A1 true DE19831147A1 (en) 2000-01-13
DE19831147C2 DE19831147C2 (en) 2002-04-25

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10125672A1 (en) * 2001-05-25 2002-12-05 Msm Gebaeudetechnik Gmbh Method for making hot water available in a building as service water in a hot water tank uses a fuel/solar heater device triggered by a control switch to heat up service water
DE10130162C1 (en) * 2001-06-22 2003-04-24 Simon Maier Regeneration controller for hot water reservoir heated by solar power uses solar current from photocell(s) for weather information, interrupts conventional heating under certain conditions
DE102005034296B3 (en) * 2005-07-22 2006-12-07 Robert Bosch Gmbh Solar operating process for heater involves detecting solar yield from at least one previous time period to set solar yield to be expected
DE102008051854A1 (en) 2008-10-17 2010-04-22 Rehau Ag + Co. Method and device for controlling a hot water treatment plant
EP1493976A3 (en) * 2003-06-27 2012-07-11 Robert Bosch Gmbh Control method for a solar plant
DE102011014907A1 (en) * 2011-03-24 2012-09-27 Robert Bosch Gmbh Method for controlling inlet temperature of fluid in solar heat collector of solar circuit for heating water stored in domestic hot water tank, involves selecting control program when storage temperature is less than threshold temperature

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10312520B4 (en) * 2003-03-20 2006-05-04 Viessmann Werke Gmbh & Co Kg Method for operating a solar-coupled heat transfer circuit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4333506C1 (en) * 1993-10-01 1994-12-01 Buderus Heiztechnik Gmbh Charging control system of a storage tank for domestic hot water
DE19524352A1 (en) * 1995-07-04 1997-01-09 Buderus Heiztechnik Gmbh Power optimised charging regulation for hot water storage systems - applies selective heating by heat generator and/or solar collectors and temp. in storage is measured at specified time intervals controlled according to gradient

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10125672A1 (en) * 2001-05-25 2002-12-05 Msm Gebaeudetechnik Gmbh Method for making hot water available in a building as service water in a hot water tank uses a fuel/solar heater device triggered by a control switch to heat up service water
DE10125672B4 (en) * 2001-05-25 2004-03-25 MSM Gebäudetechnik GmbH Method and device for water heating
DE10130162C1 (en) * 2001-06-22 2003-04-24 Simon Maier Regeneration controller for hot water reservoir heated by solar power uses solar current from photocell(s) for weather information, interrupts conventional heating under certain conditions
EP1493976A3 (en) * 2003-06-27 2012-07-11 Robert Bosch Gmbh Control method for a solar plant
DE102005034296B3 (en) * 2005-07-22 2006-12-07 Robert Bosch Gmbh Solar operating process for heater involves detecting solar yield from at least one previous time period to set solar yield to be expected
DE102008051854A1 (en) 2008-10-17 2010-04-22 Rehau Ag + Co. Method and device for controlling a hot water treatment plant
DE102011014907A1 (en) * 2011-03-24 2012-09-27 Robert Bosch Gmbh Method for controlling inlet temperature of fluid in solar heat collector of solar circuit for heating water stored in domestic hot water tank, involves selecting control program when storage temperature is less than threshold temperature
DE102011014907B4 (en) * 2011-03-24 2013-07-25 Robert Bosch Gmbh Method for controlling a solar circuit

Also Published As

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Owner name: BBT THERMOTECHNIK GMBH, 35576 WETZLAR, DE

8327 Change in the person/name/address of the patent owner

Owner name: ROBERT BOSCH GMBH, 70469 STUTTGART, DE

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R071 Expiry of right