thermal solar energy - stations, controllers, collectors

Thermal solar energyStations, controllers, collectors, accessories,

service, software

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130729_Solarthermie_GB_v3_Oventrop_P_0052 neu.qxd 27.08.13 11:36 Seite 1

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Stations for solar plants and solid fuel boilerconnection are becoming more and moreimportant.The reasons are not at last the rising energyprices and the changing environmental con-sciousness of consumers.These stations are not only installed in newbuildings, but also existing systems areincreasingly converted.

The use of solar energy for heat generationis a good opportunity to reduce energycosts in combination with gas/heating oilgross calorific boilers.

Example: Construction of a solar plant in a detached house

Thermal solar energyContent

Content

Page

2 Content3 Significance of solar energy4 Solar hot water preparation and support of the heating system5 Tube collector “OKP-10/20”6 Flat-plate collector “OKF”7 Stations “Regusol-130”8 Stations “Regusol-180”9 Station “Regusol X-Uno” with heat exchanger

10 Station “Regusol X-Duo” with heat exchanger11 Hot water preparation and support of the heating system – Buffer storage cylinder and station for heating of potable water

“Regumaq X” – System illustration12 Hot water preparation and support of heating system – Buffer storage cylinder and station for heating of potable water “Regumaq X”

– Loading section by section with station “Regusol X-Duo” – System illustration13 “Regumaq X-30-B/XZ-30-B” Stations for heating of potable water14 “Regumaq XK” Cascade control set for heating of potable water – Control concepts15 “Regtronic” Controllers for solar and heating techniques16 “Regtronic” Electronic controllers – Pipework configurations, examples17 “Regucor WHS” Energy storage centre, “Hydrocor” Storage cylinders18 “Solar” Diaphragm expansion tanks, in-line tanks – Pipes and fittings19 Further products for thermal solar energy20 Service, software


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Significance of solar energy

Fossil fuel reserves will become more andmore important over the next few years and for this reason regenerative energysources will become vital.

For the good of the next generations, theclimate targets and the reduction of CO2emissions must become the responsibilityof everyone in our society.

Solar energy helps to conserve resources, is available to a sufficient extent and helpsto avoid CO2 emissions.

Solar energy is thus one of the most promi-sing energy sources and should be used to full advantage.

All over the world, solar plants becomemore and more important for hot water preparation and heating system support.

Solar plants require little maintenance. They are not only crisis-proof and a calcu-lable future investment but also enable their users to circumvent oil and gas priceincreases to a certain extent. Last but notleast, solar plants create work places.

Advantages of solar plants:- protection of the environment as resourcesare conserved and CO2 emissions areavoided

- increased value of real estate

- increased independence

- crisis-proof

Oventrop systems for solar thermal energyare suitable for hot water preparation, hea-ting system support and process heat supply.

The Oventrop solar systems and compo-nents such as collectors, stations andaccessories can be combined with existingappliances which need not be replaced. The systems allow for individual solar plantconfigurations.

The common solar plants are not only usedfor hot water preparation but also for heat-ing system support. As a major part of energy in a house is used for the heatingsystem, the combination “hot water prepa-ration plus support of the heating system”offers the highest potential of energy saving.

1 Detached house with solar plant

2 Vacuum tube collector field, flat roofinstallation

3 Vacuum tube collector plant, wall instal-lation

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Solar hot water preparation andsupport of the heating system

Function of a solar thermal plant for hotwater preparation

The heat transfer liquid is heated by the sunvia the collector absorber. The solar liquid istransported by the station’s circulationpump to the lower heat exchanger, forinstance a bivalent potable water storagecylinder, where heat is transmitted to thepotable water.The circulation pump in the solar circuit isonly activated by the solar controller if thetemperature in the collector is higher thanthe temperature in the lower section of thestorage cylinder. The temperature differenceis detected by temperature sensors at thecollector and the bivalent storage cylinder.Depending on the temperature difference,the flow rate of the solar liquid is increasedor reduced. This way, an optimum solar heatreturn and suitable temperatures inside thestorage cylinder are achieved. In central Europe up to 60-70% of the energydemand for hot water preparation can besaved.If solar radiation is not intense enough forhot water preparation, the required energymust be supplied by another heating sys-tem.1 Basic illustration of a solar plant for hotwater preparation2 Switching diagram with bivalent potablewater storage cylinder

Function of a solar thermal plant for hotwater preparation and support of theheating system

The function of a solar thermal plant forsupport of the heating system is similar tothat of a solar plant for hot water prepara-tion described before. The collector surfaceof a solar plant for support of the heatingsystem is larger than that for hot water pre-paration only. Correctly dimensioned and installed solarplants can supply up to about 15 – 20% ofthe total energy demand (hot water prepa-ration and support of the heating system).Heat storage is different. The heat is storedin solar buffer storage cylinders for instance.Hot water preparation is carried out by heatexchanger stations “Regumaq X”. Integration of the heating system is fre-quently carried out by a return temperatureincrease of the heating circuit. If the tem-perature in the storage cylinder is higherthan the heating return temperature, athree-way diverting valve “Tri-D TR” is ope-rated and leads the heating return throughthe storage cylinder where it heats thewater. If the storage cylinder temperature istoo low, the heating return is warmed up bythe conventional heating system.1 Basic illustration of a solar plant with hea-ting system support2 Switching diagram with return tempera-ture increase

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Solar hot water preparation

During the summer months, the energyrequired for hot water preparation can becovered completely by a professionallydimensioned and installed solar thermalplant. The Oventrop solar thermal system for hotwater preparation consists basically of thefollowing main components: 1. the collector field consisting of “OKP”vacuum tube collectors or high-capacityflat-plate collectors “OKF”2. the solar station “Regusol” with integra-ted control for heat transport and thenecessary safety devices3. the solar buffer storage cylinder or biva-lent potable water storage cylinder

Solar hot water preparation and supportof the heating system

The Oventrop solar thermal system for hotwater preparation and support of the hea-ting system consists of the following maincomponents:1. the collector field consisting of “OKP”vacuum tube collectors or high-capacityflat-plate collectors “OKF”2. the solar station “Regusol” with integra-ted control for heat transport and thenecessary safety devicesThe existing boiler can also be blocked oractivated.3. the solar buffer storage cylinder and thebuffer storage cylinder

Three-way diverting valve “Tri-D TR“ Buffer storage cylinder

“Brawa-Mix“

“Regumat M3“ “Regusol EL“

SupplyReturn

Control line forboiler control

Collector “OKF/OKP“

Three-way diverting valve “Tri-D TR“ Solar buffet storage cylinder

“Regumaq X““Regumat M3“ “Regusol EL“

SupplyReturn

Control line for boiler controlInternal terminal



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The tube collector “OKP-10/20” is a heatpipe tube collector which distinguishes itselfby a permanent heat transport. Due to itshydronic features, the collector can be fixedto the building (pitched or flat roof, facadeor detached) with an inclination of the axisbetween 15° and 75°. The tube collector can be used for heating ofpotable or swimming pool water, solar sup-port of the heating system and the produc-tion of process heat.Due to the high-selective absorber surface, ahigh solar share is achieved.The vacuum inside the tube guaranteesmaximum insulation. The high quality corro-sion resistant materials ensure a long servi-ce life of the tube collector “OKP-10/20”.1 Tube collector “OKP-10/20”tested to DIN EN 12975 and certified accor-ding to “SolarKeymark”. According to theITW basic rules, the annual collector heatreturn amounts to 683 kW h/m². The collec-tor heat return forecast is based on an aper-ture surface area of 3 m² (small illustr.: Footrail with stainless steel angular plate foradditional protection of the vacuum tubeson the roof)2 Illustrated section tube collector “OKP-

10/20”Function:

- Sunlight is absorbed and converted into heat- Heat is transmitted to the heat pipe via theheat conducting steel sheet inside theglass tube

- Liquid inside the heat pipe evaporates;steam rises into the condenser

- Heat is transmitted to the passing heattransfer medium via the double tube heatexchanger (collector) in which the conden-ser is located

- Liquid inside the condenser condensesdue to the heat output, flows back insidethe heat pipe and the procedure is repea-ted

3 System illustration solar circuit withcollector4 Simple installation of the roof hooks to the“OKP” frame profiles (lateral fitting)

Award:

Tube collector “OKP-10/20”

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Return

Supply

Permanent

heat transport

German Designer ClubGood Design


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Flat-plate collectors “OKF-CK22/OKF-CS22” can be used for heating of potableand swimming pool water and for solar sup-port of the heating system. The flat-platecollector can be mounted horizontally andvertically and is suitable for rooftop installation,roof integration and freestanding installation(flat roof installation).Depending on the type of installation, basicsets for two collectors, extension sets foreach additional collector and an individualcollector set are available. The preassem-bled rail systems for rooftop and flat roofinstallation allow a quick and rational instal-lation on site.All fixing elements are easily accessible andallow a time-saving installation. The absorber made of aluminium heat con-ducting steel sheet and copper pipe isconnected to the solar circuit via two collec-tor connections with G 1/2 male thread. The flat-plate collectors are connected withone another by using flexible stainless steelcorrugated pipes. Thermal conditionalexpansions are compensated at the sametime. 1 Flat-plate collector “OKF-CK22” tested toDIN EN 12975 and certified according to“SolarKeymark”. According to the ITW basicrules, the annual collector heat return amountsto 499 kW h/m². The collector heat returnforecast is based on an aperture surfacearea of 5 m².2 ComparisonAntireflective glass (“OKF-CK22”) standardglass (“OKF-CS22”)The antireflective glass of the flat-platecollector “OKF-CK22” increases transmis-sion by 5%. Especially during winter, with aninclined incidence of light, the transmission is improved considerably compared withstandard glass. The water does not form drops on the nano-structure of the antireflective glass but drainsaway like a thin film (“no drop effect”).3 Construction of the flat-plate collector

Flat-plate collector “OKF-CK22”

Antireflective glass Standard glass/structural glass

Glass Glass

Nano-structure

Antireflective solar glass

Laser weldedfull surface absorberwith panelselective coating

No thermal bridgesowing to uninterruptedperipheral insulation

Thermal insulation with athickness of 60 mmminimises heat losses

Absorber pipes forbest possible heat conduction

Aluminium frame

Sunlight 100 % Sunlight 100 %

Transmission 96% Transmission 91%


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1 Station “Regusol ELH-130-B” with safetygroup (pump length 130 mm) with elec-tronic controller “Regtronic RC-B” and deaerator for an effective deaeration of theheat transfer medium in the supply.Connection to the solar circuit DN 25 usingcompression fittings “Regusol”.Completely pre-assembled and leak testedstation with safety group and facility toconnect an expansion tank.2 Station “Regusol S-130” with safety group(pump length 130 mm) but without electroniccontroller and without deaerator.Connections:DN 20: G 3/4 male thread (compression

fittings according to DIN V 3838)DN 25: G 1 male thread ( for “Regusol”

compression fittings)3 Station “Regusol L-130” without electroniccontroller.Connections as station “Regusol S-130”.4 Pump circuit “Regusol P-130” with safetygroup. Check valve integrated in the ballvalve.Connections as station “Regusol S-130”.5 Station “Regusol EL-130-B” with electronicdigital controller.

Stations “Regusol-130”

High-efficiency permanentmagnet technology

as for heating pumps with energy effiency class A rating


1 Station “Regusol L-180” DN 25 withsafety group (pump length 180 mm) anddeaerator for an effective deaeration of theheat transfer medium in the supply.Connection to the solar circuit DN 25 usingcompression fittings “Regusol”.Completely pre-assembled and leak testedstation with safety group and facility toconnect an expansion tank.2 Pump circuit “Regusol P-180” DN 25 withsafety group.3 Station “Regusol S-180” DN 25, sameconstruction as station “Regusol L-180” butwithout deaerator.4 Station “Regusol S-180” DN 32 withsafety group. Connection to the solar circuitG 2 flat sealing.

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Stations “Regusol-180”

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Station “Regusol X-Uno” with heat exchanger

Product assembly with electronic controllerand heat exchanger for a controlled trans-mission of the heat of the solar circuit (pri-mary circuit) to a buffer storage cylinder(secondary circuit), for instance for existingstorage cylinders without direct solarconnection.Primary circuit up to PN 10 and 120°C,starting temperature 160°C.Secondary circuit up to PN 6 and 120°C,constant operation.The soldered plate heat exchanger com-plies with the specifications of the Europe-an Pressure Equipment Directive (PED).Due to turbulent flow conditions, an excel-lent self-cleaning effect is produced and acontamination is avoided.The solar circuit is protected againstexcess pressure by a safety group integra-ted in the heat exchanger system. The leaktested components of the plate heatexchanger system are mounted on aboard. The controller is cabled with theinternal electric components and has thefollowing connections:- Output for solar circuit pump- Output for loading pump

- Temperature entries for:Collector, heat exchanger entry point – primary side, heat exchanger exit point-secondary side, 2 temperature entries forbuffer storage cylinder, interface for elec-tronic flow sensor.

Plain text display of the controller and dataoutput (S-bus). The heat exchanger systemis completely insulated and can quickly be connected to the primary side using compression fittings and to the secondarycircuit using flat seals and be put into ope-ration.The actual heat transmission depends on:- the achieved flow temperature and theflow rate of the primary circuit

- the flow temperature difference betweenthe primary and the secondary circuit

- the required flow temperature and theflow rate of the secondary circuit

Model:

- “Regusol X-Uno 25-B”Station with heat exchanger1 solar circuit connection/1 loading circuit connectionwith electronic controller “Regtronic RX-B”number of heat exchanger plates: 30

1 “Regusol X-Uno”2 System illustration

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1 Solar circuit – Supply2 Solar circuit – Return3 Buffer storage cylinder – Return4 Buffer storage cylinder – Supply 5 Insulation 1

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Station “Regusol X-Duo” with heat exchanger

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Product assembly with electronic controller,heat exchanger, three-way conversion valvefor second loading circuit for the controlledtransmission of the heat of the solar circuit(primary circuit) to a buffer storage cylinder(secondary circuit), for instance for existingstorage cylinders without direct solarconnection.The three-way valve integrated in the sup-ply pipe of the secondary circuit allows theconversion to an additional loading circuitrunning in parallel, for instance for the loa-ding section by section of the storage cylin-der or the thermal loading of another stora-ge cylinder. Primary circuit up to PN 10 and 120°C,starting temperature 160°C.Secondary circuit up to PN 6 and 120°C,constant operation.The soldered plate heat exchanger com-plies with the specifications of the EuropeanPressure Equipment Directive (PED). Due toturbulent flow conditions, an excellent self-cleaning effect is produced and a contami-nation is avoided.

The solar circuit is protected against excesspressure by a safety group integrated in theheat exchanger system. The leak testedcomponents of the plate heat exchangersystem are mounted on a board. The con-troller is cabled with the internal electriccomponents and has the following connec-tions:- Output for solar circuit pump- Output for loading pump- Output for conversion valve- Temperature entries for:Collector, heat exchanger entry point – primary side, heat exchanger exit point-secondary side, 3 temperature entries forstorage cylinder with loading operationsection by section, interface for electronicflow sensor.

Plain text display of the controller with dataoutput (S-bus). The heat exchanger system is completelyinsulated and can quickly be connected tothe primary side using compression fittingsand to the secondary circuit using flat sealsand be put into operation.The actual heat transmission depends on:

- the achieved flow temperature and theflow rate of the primary circuit

- the flow temperature difference betweenthe primary and the secondary circuit

- the required flow temperature and the flowrate of the secondary circuit

Model:

- “Regusol X-Duo 25-B”Station with heat exchanger1 solar circuit /2 loading circuit connec-tions with electronic controller “RegtronicRX-B” number of heat exchanger plates: 30

1 “Regusol X-Duo”2 System illustration

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1 Solar circuit – Supply

2 Solar circuit – Return

3 Buffer storage cylinder – Return

4 Buffer storage cylinder – Supply I

5 Buffer storage cylinder – Supply II

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Hot water preparation and support of heating systemBuffer storage cylinder and station for heating of potable water

“Regumaq X”

System illustration

Solar circuit

The solar plant is connected and controlledvia the station “Regusol X-Uno” with inte-grated heat exchanger and the integratedcontroller “Regtronic RX-B”. Re-loading of the buffer storage cylinderThe buffer storage cylinder is re-loaded bythe boiler depending on the storage cylindersensor (T).

Hot potable water

Hot potable water is supplied by the stationfor heating of potable water “Regumaq X”when needed.No hot potable water is stored; therefore theinstallation is hygienically safe.

Support of the heating system and returntemperature increase

The flow temperature is controlled via theexisting boiler control. The mixing valve ofthe “Regumat M3” station is activated de-pending on the outside temperature. In order to use the solar energy in the stora-ge cylinder, a return temperature increase isrealised via the controller “Regtronic RX-B”.If the return temperature is lower than thestorage cylinder temperature, the three-waydiverting valve “Tri-D TR” is switched to portIII.Energy for return temperature increase istaken from the storage cylinder.

Three-way diverting valve “Tri-D TR“Buffer storage cylinder

“Regumaq X““Regumat M3“ “Regusol X Uno“

SupplyReturnControl line for boiler control



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Hot water preparation and support of heating system-Buffer storage cylinder and station for heating of potable water

“Regumaq X”Loading section by section with station “Regusol X-Duo”

System illustration

Solar circuit

The solar plant is connected and controlledvia the station “Regusol X-Duo” with inte-grated heat exchanger and the integratedcontroller “Regtronic RX-B”. Depending on thetemperatures available in the collector cir-cuit, the station “Regusol X-Duo” allows aloading of the storage cylinder section bysection. High temperatures are stored in theupper and low temperatures in the middle section of the storage cylinder. This way, efficiency of the solar plant is increased.Re-loading of the buffer storage cylinder

The buffer storage cylinder is re-loaded bythe boiler depending on the storage cylindersensor (T).

Hot potable water

Hot potable water is supplied by the stationfor heating of potable water “Regumaq X”when needed.No hot potable water is stored; therefore theinstallation is hygienically safe.

Support of the heating system and return temperature increase

The flow temperature is controlled via theexisting boiler control. The mixing valve ofthe “Regumat M3” station is activated de-pending on the outside temperature. In order to use the solar energy in the stora-ge cylinder, a return temperature increase isrealised via the controller “Regtronic RX-B”. Ifthe return temperature is lower than the sto-rage cylinder temperature, the three-waydiverting valve “Tri-D TR” is switched to port III.Energy for return temperature increase istaken from the storage cylinder.

Three-way diverting valve “Tri-D TR“Buffer storage cylinder

“Regumaq X““Regumat M3“ “Regusol X Duo“

SupplyReturnControl line for boiler control


Non-returncheck valve

Non-returncheckvalve


“Regumaq X-30-B/XZ-30-B”Stations for heating of potable water

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„Regumaq X-30-B“The Oventrop station “Regumaq X-30-B” is anelectronically controlled product assembly with heat exchanger for the hygienic heating of potable water on the flow principle. Thepotable water is only heated at the time whenit is needed, i.e. “just in time”. A hot potablewater reserve is thus not necessary.The product assembly allows an optimumrealisation of regenerative pipework configu-rations. The stations are especially suitablefor detached and semi-detached houses.They are connected to buffer storage cylin-ders which are heated up by solar energy,solid fuels, gas or oil. Depending on the temperature and the flowvolume on the potable water side (secondarycircuit), the circulation pump on the bufferside (primary circuit) is speed regulated.The plate heat exchanger can be flushedusing the fill and drain cocks integrated in theprimary and secondary circuit. Due to the tur-bulent flow, a good self-cleaning effect avoiding a contamination is achieved. The potable water circuit is protected by a 10 bar safety valve.The leak tested components of the heatexchanger system have flat sealing connec-tions and are mounted on a board.

“Regumaq XZ-30-B”The Oventrop station “Regumaq XZ-30-B” forheating of potable water is identical to thestation “Regumaq X-30”, but the productassembly for the operation of circulationsystems is additionally equipped with a circu-lation pump in the potable water circuit.The controller is fully cabled with the internalelectric components and serves to control thefollowing additional functions:- Demand: The circulation function is acti-vated if water is drawn off for a short period

- Cycle: The circulation pump runs accordingto the set time switching

- Temperature control: the circulation pumpruns dependant on the return temperature

- Three switching points within the corre-sponding operating mode can be pro-grammed each day

1 “Regumaq X-30-B” station for heating ofpotable water with electronic controller2 “Regumaq XZ-30-B” station for heating ofpotable water with electronic controller andadditional potable water circulation3 System illustration “Regumaq X-30-B”4 Draw off capacities (Q secondary) of the“Regumaq” station depending on the tem-perature in the buffer storage cylinder

Example (see illustr. 4):If a temperature of 45°C is set at the control-ler, a draw off volume flow of 30 l/min. (Q secondary) can be achieved with a watertemperature of 60°C inside the buffer storagecylinder and a required volume flow of 25 l/min. in the buffer circuit.The primary volume flow is modified by thepump in the storage cylinder circuit which isactivated by the controller.

1 Supply from the storage cylinder2 Return to the storage cylinder3 Hot water4 Cold water supply5 Insulation

Hot water

Cold water

Storagecylinder

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Flow volume, heating of potable water from 10°C to 45°C

Q p

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(l/

min

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Q secondary (l/min)

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Storage cylinder temperature


“Regumaq XK”Cascade control set for heating of potable water

Control concepts

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Cascade control set “Regumaq XK”

consisting of:Cascade control and actuators with ball val-ves for potable water supply.The cascade control set allows to increasethe discharge capacity of the stations “Regumaq XZ-30-B” up to 120 l/min.

Models:

- Set for the control of 2 “Regumaq XZ-30-B”stationsDischarge capacity: 60 l/min. with a hotwater temperature of 50°C and a coldwater temperature of 10°C2 actuators with ball valve



1 “Regumaq XZ-30-B” with “Regumaq XK”

2 System illustration

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Electronic controller for wall attachment withpreinstalled switching schemes for the control of a solar thermal plant and/or forheating circuit regulation.The combination of preinstalled switchingschemes and freely adjustable additionalfunctions allows the controller to performcomplex controls.1 Solar controller “Regtronic B2/2-B”Simple collar controller for wall attachmentfor the control of a solar plant for hot waterpreparation with one collector and one sto-rage cylinder.- 4 sensor inputs- 1 output- 1 data output S-bus

2 Heating circuit controller “RegtronicRH-B”

Weather guided control of the flow tempera-ture of the heating system via the demand of a heat generator and/or a mixing valve(e.g. “Regumat M3” or “Regufloor HW” withthree-way mixing valve). The heating circuitcontroller may control one variable tempera-ture circuit and one constant temperaturecircuit with heat demand.Extendable to up to 6 variable temperaturecircuits and 6 constant temperature circuitsvia the extension module “Regtronic EM-B”(item no. 115 20 98).- 8 sensor inputs- 2 inputs for electronic volume flow sensors- 5 outputs (one of them volt free relay)- 2 PWM/0-10 V outputs (convertible)- 1 data output S-bus- SD-card slot

3 System controller “Regtronic RM-B”

The system controller controls solar plantswith East-West roof orientation and severalstorage cylinders as well as weather guidedvariable / constant temperature circuits.Different loading functions such as storagecylinder loading section by section, heatexchange, heat demand, boiler loading,solid fuel boiler, mixing valve control, meas-urement of heat consumption, tube collec-tor function, drain back option, thermostatfunction, ΔT-regulation, thermal disinfection,circulation and further functions may beactivated via the intuitive user command.Up to 5 extension modules “Regtronic EM-B” (item no. 115 20 98) can be connectedto the “Regtronic RM-B”. Thus, there is atotal number of 39 relay outputs for individ-ual pipework configurations.- 12 sensor inputs- 4 inputs for electronic volume flow sensors- 3 pulse inputs- 14 outputs (one of them volt free relay)- 4 PWM/0-10 V outputs (convertible)- 1 data output S-bus- SD-cart slot4 System illustration

“Regtronic”Controllers for solar and heating techniques

Radiator circuitExisting heating system

Switching signalfor heating circuit control

Switching signal to the boiler

Boilercontrol

Boiler

Controller“Regtronic RM-B“

Extension for solarheating of potablewater and supportof the heating system


“Regtronic”Electronic controllers

Pipework configurations, examples

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The below mentioned pipework configurations can be realised with the Oventrop controllers.

The Oventrop controllers allow for a number of possible pipework configurations. Amongst others, functions like return temperature increase, boiler activation, wood burning boiler activation, circulation function, threshold function as well as heating and cooling function caneasily be realised.

Pipework configuration “BS/2-B“ “RC-B“ “RM-B“

X X X

X X

X X

X X

Further pipework configurations can be found in the catalogue “Products”, product range 7.


“Regucor WHS” Energy storage centre“Hydrocor” Storage cylinders

Heating systems with regenerative energysources consist of various components.They are often installed separately andhave to be co-ordinated.This problem is solved by the Oventropenergy storage centre “Regucor WHS”. Itconsists of a heating water storage cylinderfor efficient heat storage and componentswhich are hydraulically co-ordinated. Theheat management of the integrated systemcontroller guarantees an optimum inter-action between the heating water storagecylinder and all other components.The “Regucor WHS” which allows a time-and space-saving installation can be con-nected to different heat generators. TheOventrop energy storage centre “RegucorWHS” consists of:- Solar station- Hot water preparation- Heating circuit connection- Heat storage- Heat generator connection

(e.g. boiler, heat pump etc.)1 Energy storage centre “Regucor WHS”

The storage cylinder stores the water heatedby solar energy.Buffer storage cylinders are available assolar buffer storage cylinder with internalheat exchanger for the solar circuit or aspure buffer storage cylinder without heatexchanger. The most common potable water storagecylinders in a solar plant are referred to asbivalent storage cylinders as the storagecylinder cannot only be loaded with the helpof solar energy but it can also be re-loadedby another energy source. This type of storage cylinder features two internal heatexchangers.The bivalent storage cylinders for potablewater should not be oversized as this presents a risk of germs and hygiene canbe impaired. The rule-of-thumb for dimensioning in Central Europe is as follows:Hot water preparation:

Storage cylinder volume of about 50 litresper square meter of installed aperture surface area.2 Puffer storage cylinder “Hydrocor HP”3 Solar buffer storage cylinder “Hydrocor HS”4 Bivalent potable water storage cylinder“Hydrocor WB”

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“Solar” Diaphragm expansion tanks, in-line tanksPipes and fittings

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1 Special expansion tank for solar plantswith a nominal volume of 18, 25, 33, 50 or80 l.Permissible operating temperature 70°CMax. operating pressure 10 barDiaphragm tested according to DIN 48 03T3; approved according to Pressure Equip-ment Directive (PED) 97/23 EC.2 In-line tank with a nominal volume of 6, 12or 20 l for the protection of the diaphragmexpansion tank and the solar station fromexcess temperatures.The in-line tanks are for instance required ifthe “OKF” flat-plate collectors are installedvertically or in central roof heating systemswith short pipes.Max. operating pressure: 10 barApproved according to Pressure EquipmentDirective (PED) 97/23/EG.3 Oventrop offers an extensive range ofaccessories (e.g. stainless steel corrugatedpipe for roof conduit, connection fittings forseries coupling of several “OKP-10/20”collectors into a large collector field) for theconnection of “OKP-10/20” tube collectors(see also page 5).Without illustr.: Oventrop offers differentconnection fittings, flat sealing or with com-pression connection, for the flexibleconnection of the “OKP-10/20” tube collec-tors to the solar circuit.


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1 Flow measuring and regulating devicewith isolation, for instance for “Regusol-130”, 2-15 l/min. 2 Venting circuit for replacement at existingstations “Regusol-130” consisting of:Ball valve with integrated check valve, ther-mometer and deaerator.3 Filling and flushing device “Regusol”Isolating ball valve with lateral connectionfor filling and flushing pipes to be installedat the lowest point of the solar circuit.4 Filling pump “Regusol”Manual filling pump with hose connectionand ball valves on suction and pressureside.5 Three-way mixing valve and temperaturecontroller with immersion sensor, is used forindustrial installations, water heaters, airheaters, dishwashers, surface heatingsystems or similar. The control range can belimited or locked.6 Connection set “Regusol”For the connection of a diaphragm expan-sion tank to the solar station “Regusol”.Consisting of: Steel angled wall bracket,quick coupling for diaphragm expansiontank and a corrugated pipe.7 Circulation station “Regucirc M” for biva-lent storage cylinders. The thermal insulatedpump assembly consists of a thermostaticmixing valve (35°C – 65°C) with fail-safefunction, non-return check valves and isolating ball valves with integrated ther-mometers. The station is installed betweenthe bivalent potable water storage cylinderand the circulation system. The station serves to adjust the temperature of a hotwater circulation system to the value set atthe thermostatic mixing valve even if no hotwater is drawn off.8 Thermostatic mixing valve “Brawa-Mix”made of bronze, for domestic water installa-tions PN 10 up to 100°C.Control range: 35-50°C9 Brass ball valve “Optiflex”with male or female thread, self-sealing,with counternut, handle with limit stop, withhose connection (soft seal) and cap.

Further products for thermal solar energy

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OVENTROP GmbH & Co. KGPaul-Oventrop-Straße 1D-59939 OlsbergPhone +49 (0 ) 29 62 82-0Fax +49 (0 ) 29 62 82-450E-Mail [email protected] www.oventrop.de

Further information can be found in theOventrop catalogue “Products”, in thetechnical data sheets as well as on theinternet, product ranges 6 and 7.

Subject to technical modifications.

For an overview of our global presence visitwww.oventrop.de.

Service, Software

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1 Oventrop support their partners withtheoretical and practical seminars.Competent instructors report on current guidelines, standards and possible state-sponsorships.Practical examples clarify the correct de-sign and the useful integration of Oventropcomponents and complete systems for thesolar circuit, hot water preparation and support of the heating system (includingunderfloor and wall heating).2 The design of a solar plant can be carriedout online in the software menu of theOventrop homepage www.oventrop.de.Distinction is made between hot water preparation and hot water preparation withsupport of the heating system. A worldwideclimate data bank can be accessed. Thenumber of collectors and the suitable stor-age cylinder size are calculated accordingto the consumption-related data for in-stance number of persons, heat load orenergy consumption. The calculation sup-plies information on the heat return, shareand CO2 savings.3 The efficiency of a solar thermal plantdepends on the hydronic integration anddimensioning. Especially the solar networkhas to be designed to the optimum to avoida reduction of the efficiency by unnecessarilyhigh pump outputs. Dimensioning of thecomponents is carried out with the help ofthe Oventrop solar calculation programme“OVsol”. Depending on the choice of a highor low flow system, the programme deter-mines the volume flow, the pipe diameter,the pump head and the volume of the diaphragm expansion tank. Above all, thepresetting values of solar double regulatingand commissioning valves for the hydronicbalance of several collector fields can becalculated. Both programmes can be downloaded orused on the Oventrop homepage free ofcharge.


thermal solar energy - stations, controllers, collectors

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