SOLARGE

Laurentiushaus

Olching, Germany

Nursing home | 77 sqm installation

 


Project summary · Technical description · Financing · Development · Downloads

Project Summary


Description

Because of not reaching the new EU-building standard two natural gas condensing boilers (each 350 kW) were renewed. Additionally a significant high hot tap water demand in the summer period was identified. These gave the impulse for renewing the boilers and installing three CHP (combined heat and power unit) and a solar thermal system for the nursing home Laurentiushaus.


 


Building

Type of building

Nursing home

Number of dwellings, floors

144 residents
110 dwellings
3 floors

Year of construction

1982

Total effective area (heated)

7,740 m2

Hot tap water consumption (measured/estimated)

1,200 m3/a

Whole energy consumption for heating purpose after CSTS implementation

2,250,000 kWh/a


System engineering

Year of construction of CSTS

2005

Type of collectors

Flat plate collectors

Thermal power

48 kWtherm.

Aperture area of collectors*)

69 m2

Buffer storage

3.0 m3

Hot tap water storage

2.75 m3

Total capacity of boilers with energy source

637.5 kW,
Natural gas

Type of hot tap water heating

Centralised

Type of heating system

Centralised


Costs

Total cost solar system

41,000 Euro

Cost of the CSTS/gross area of collectors

532 Euro/m2

Subsidies

0 %


Output

Output of solar heat**)

35,000 kWh/a

Reduction of final energy***)

39,000 kWh/a

CO2-emissions avoided

9.8 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

 

 


Uwe Reebs,
general manager:

"We are glad of using this technology. We are indebted to Ingenieurbüro Ulrich GmbH for their good consultancy and supports. This heating system is our share on the protection of the environment."

 

 


Owner

Evangelisches Alten- und Pflegeheim
Laurentius Olching
(Protestant nursing home Laurentius in Olching)
Herr Uwe Reebs
Feursstr. 23
D-82140 Olching, Germany
Phone: +49 8142 450133
Fax: +49 8142 17491
Uwe.reebs(at)diakonieffb.de
www.laurentiushaus.diakonieffb.de 


Operator

see Owner

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Technical description

 


Description of the CSTS

Year of construction of CSTS

2005

Thermal power

48 kWtherm.

Gross area of collectors

77.1 m2

Aperture area of collectors

69 m2 

Type of collectors

Flat plate collectors

Type of assembly

On roof top

Orientation of collectors

South (0°)

Inclination angle to horizon

28°

Freezing protection

Glycol

Overheating protection

Expansion vessel

Operation mode

Low flow

Use of CSTS for

Hot tap water heating

Buffer storage

3.0 m3

Hot tap water storage

2.75 m3
(2×1,000 l and 1×750 l)

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

2,750 m3

Specification (if necessary)

./.


Space heating system

Type of heating system

Centralised

Number of boilers

5

Total capacity (power output) of boilers

637.5 kW

Capacity of each boiler (year of construction)

2×300 kW (2005)
3×12.5 kW (2005)

Energy source

Natural gas

Type of boiler system

Condensing (2)
Cogeneration unit (3)


Type of operation

Operator of the CSTS system

Self-operation

CSTS monitoring

Yes: all data between collectors and hot tap water system,
reported and metered data are sent via remote data transmission to IB Ulrich GmbH.

Data accessible via internet

Yes

Scientific monitoring & follow up

No

Maintenance contract

Yes

Visualisation of the solar heat output

No


Yield of CSTS plant

Output of solar heat

35,000 kWh/a

Origin of data

Calculated

Measuring point

Between collector and storage

Reduction of final energy

39,000 kWh/a

Origin of data

Design

Solar performance guarantee

No


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

2,250,000 kWh/a

Origin of data

Estimated

Energy used for heating of

Hot tap water heating,
space heating, kitchen

Whole energy consumption for heating purposes before CSTS implementation

2,821,500 kWh/a

Total tap water consumption

not available

Hot tap water consumption

1,200 m3/a

Hot tap water temperature

60 °C

Cold water temperature

10 °C

 

 


Summary

The solar thermal system is solely providing hot tap water heating. A three cbm buffer storage tank is built in for storing the solar heat. If required the buffer storage tank delivers the heat to a serial 750 litre fresh water storage tank. Further two 1,000 litres stand by tap water storage tanks get the solar heat afterwards. These both storage tanks also heat up the tap water to needed temperatures, if required.


 


Planner & Engineering company

Ingenieurbüro Ulrich GmbH
Mr. Ulrich
Margarethenweg 1
D-82194 Gröbenzell, Germany
Phone: +49 8142 570239
Fax: +49 8142 570240
Ib-ulrich(at)online.de

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Financing and investment

 


Financing of the CSTS

Form of financing

Purchase

Distribution in percentage

0 %


Costs of solar materials

Total cost of solar system

41,000 Euro

Detailed costs for

Collectors

13,600 Euro/a

Elevation / mounting structure

3,500 Euro/a

Storage / heat exchanger

9,000 Euro/a

Control

1,200 Euro/a

Installation

13,000 Euro/a

Others

700 Euro/a


Operation costs of heating system

Increase of the operation cost after CSTS implementation

325 Euro/a
(power costs for pumping, maintenance costs)

 





There were no additional subsidies from KfW support programs to get, due to overstate requirements.


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Development & experiences

Qualitative aspects of the CSTS

This investment is profitable due to the high hot tap water demand during the summer period. The usage all of the offered solar energy lets raise the system efficiency.

The installed solar thermal system has achieved the planned targets. An objective cost benefit analysis and the consideration of several model calculations were crucial for realising these aims.

 

 


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: natural gas tax exemption.

Effects on rental fees?

./.


Experiences technical staff

Experienced problems or failures?

not available

Found solutions to these problems or failures?

not available

 


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

Downloads

SOLARGE_goodpractice_de_laurentiushaus_20071206.pdf

this datasheet in printable PDF-format

1.4 M

laurentiushaus_scheme.pdf

the hydraulic scheme

1.6 M

laurentiushaus_scheme_bw.pdf

the hydraulic scheme (for monochrome printers)

1.5 M