SOLARGE

Hotel Fortuna

Kirchzarten, Germany

Hotel | 54 sqm installation

+++ photo gallery (soon) +++

 


Project summary · Technical description · Financing · Development · Downloads

Project Summary

Description

During a regular pub meeting in the year 2000, hotel owner Manfred Meder and collective solar thermal systems installer and producer of solar storage tanks, Otto Wehrle, discussed the apparent high consumption of hot water in the hotel FORTUNA. A special topic was the high consumption of oil for the heating of hot water during the warm months.
Mr. Otto Wehrle reacted without delay and installed a counter for measuring the consumption of hot water.
He measured a maximum consumption of 4,000 litres on one particular day. The average daily consumtion of hot water was finally 2,900 litres.

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Building

Type of building

Hotel

Number of dwellings, floors

70 beds
5 floors

Year of construction

1977

Total effective area (heated)

not available 

Hot tap water consumption (measured/estimated)

1,058 m3/a (measured)

Whole energy consumption for heating purpose after CSTS implementation

330,000 kWh/a
(measured)


System engineering

Year of construction of CSTS

2004

Type of collectors

Flat plate collectors

Thermal power

33 KWtherm.

Aperture area of collectors*)

46.7 m2

Buffer storage

./.

Hot tap water storage

4.1 m3

Total capacity of boilers with energy source

90 kW
(heating oil)

Type of hot tap water heating

Centralised

Type of heating system

Centralised


Costs

Total cost solar system

55,000 Euro

Cost of the CSTS/gross area of collectors

1,028 Euro/m2

Subsidies

10.8 %


Output

Output of solar heat**)

25,500 kWh/a

Reduction of final energy***)

34,000kWh/a

CO2-emissions avoided

7.5 t CO2/a

Solar performance guarantee

No


*) Aperture area = light transmitting area of the front glass
**) measured, between storage and piping to taps (solar system output)
***) related to the measured output mentioned before

 

 


Manfred Meder, hotel owner:

„Finally the operating costs can be reduced with the help of a well-planned and installed solar thermal system, because the hot water consumption is guaranteed in hotels.“

 

 


Owner and operator

Hotel Fortuna
Manfred Meder
Hauptstraße 7
D-79199 Kirchzarten
Phone: +49 7661 398-0

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Technical description

 


Description of the CSTS

Year of construction of CSTS

2004

Thermal power

33 kWtherm.

Gross area of collectors

53.5 m2

Aperture area of collectors

46.7 m2 

Type of collectors

Flat plate collectors

Type of assembly

Roof-integration

Orientation of collectors

South (0°),

Inclination angle to horizon

45°

Freezing protection

Glycol

Overheating protection

Expansion vessel

Operation mode

High flow

Use of CSTS for

Hot tap water heating

Buffer storage

./.

Hot tap water storage

4.1 m3

Control of backup-system/CSTS

Separated control


Hot tap water system

Type of hot water heating

Centralised

Recirculation system

Yes

For decentralised systems:
The installation on the consumer site

./.

Size of storage for hot tap water

4.1 m3

Specification (if necessary)

./.


Space heating system

Type of heating system

Centralised

Number of boilers

2

Total capacity (power output) of boilers

90 kW

Capacity of each boiler (year of construction)

both: 45 kW (1976)

Energy source

Heating oil

Type of boiler system

Standard


Type of operation

Operator of the CSTS system

Self-operation

CSTS monitoring

Yes: storage water temperature. Owner and installer are reading data from the display.

Data accessible via internet

No

Scientific monitoring & follow up

No

Maintenance contract

No

Visualisation of the solar heat output

No


Yield of CSTS plant

Output of solar heat

25,500 kWh/a

Origin of data

Measured

Measuring point

Between storage and piping to taps

Reduction of final energy

34.000 kWh/a

Origin of data

Estimated

Solar performance guarantee

Yes


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

330,000 kWh/a

Origin of data

Measured

Energy used for heating of

Hot tap water heating and
space heating

Whole energy consumption for heating purposes before CSTS implementation

500,000 kWh/a

Total tap water consumption

3,547 m3/a

Hot tap water consumption

1,058 m3/a

Hot tap water temperature

50–70 °C

Cold water temperature

8–12­ °C

 

 


Summary

The Collective Solar Thermal Systems (CSTS) consists of VELUX-flat-plate-collectors (CLI U10 1000) integrated into the roof, a RESOL-controller EL3 and the components of solar storage tanks and heat exchanger from Otto Wehrle.
The solar storage tanks were built in one insulation jacket in order to cover the connecting pipes. This avoids transmitting cold between the solar storage tanks.


 

 


Planner

Otto Wehrle Solartechnik
Otto Wehrle
Schützenweg 1
D-79199 Kirchzarten
Phone: +49 7661 4255
(also the manufacturer of the solar storage tanks)

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Financing and investment

Introduction

The owner is also the investor. Nearly 90 % of the invested personal resources have a calculated return of investment (ROI) of approximately seven years. This is due to Mr. Wehrle´s expierence of many years.


 


Financing of the CSTS

Form of financing

Purchase

Distribution in percentage

10.8 %


Costs of solar materials

Total cost of solar system

55,000 Euro


Detailed costs for

Collectors

17,625 Euro

Storage / heat exchanger

19,362 Euro

Control

482 Euro

Installation

17,531 Euro

Planning/Engineering

included

Others

./.


Operation costs of heating system

Power cost for pumping

141 Euro/a

Total operation cost

141 Euro/a

 

 

Special note for subsidy systems in the partner country

BAFA:
5,940 EUR (110 EUR/m2, as state of 2004)

 

 

Addresses

Bundesamt für Wirtschaft und Ausfuhrkon­trolle (BAFA)
(Federal Office of Economics and Export Control)
Referate 433/434/435
Frankfurter Straße 29–35
D-65760 Eschborn, Germany
Phone: +49 6196 908-625 (Service)
Fax: +49 6196 908-800
www.bafa.de

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Development & experiences

Summary of experiences / Notices to the project performance

Technical contitions of a buildung, demand analysis, visiting reference systems, experienced companies carring out the building work with successful systems are part of a procedure which subsequently integrates a solar thermal system into already existing building services.

 


Experiences management

Experienced problems or failures?

No

Found solutions to these problems or failures?

./.


Financial effects / project performance

Project economically efficient?

Yes

Fiscal or other financial effects?

Yes

Effects on rental fees?

./.


Experiences technical staff

Experienced problems or failures?

No

Found solutions to these problems or failures?

./.

 

 

Installer

Otto Wehrle Solartechnik
Otto Wehrle
Schützenweg 1
D-79199 Kirchzarten, Germany
Phone: +49 7661 4255
(also manufacturer of solar storage tanks)

Top of page Project summary · Technical description · Financing · Development · Downloads

Downloads

SOLARGE_goodpractice_de_hotelfortuna.pdf

this datasheet in printable PDF-format

1.0 M

Hotel-Fortuna_scheme.pdf

the hydraulic scheme in PDF-format

646 K