SOLARGE

Passiv houses residential estate

Karlsbad, Germany

Residential estate | 62 sqm installation

 

 


Project summary · Technical description · Financing · Development · Downloads

Project Summary

Description

Paradigma has developed concepts of medium-sized and large solar thermal systems since 1994, as well as all its needed components like collectors, storage tanks, control units, heating surfaces and heat generators. Initiated and financed by Alfred Ritter, Paradigma has extended its proven concepts with this type of residential estate of passive houses. This residential estate exists of twelve single-family houses each with 170 m2 on three floors. Solar energy is used for hot tap water and space heating. The first buildings were settled in 2001, the last buildings were finished in spring 2002. The residential estate was consistently planned and built in a passive house design. Efficiency and the usage of ecological technical building equipment have always been in the primary focus.




 


Building

Type of building

Residential estate

Number of users / dwellings, floors

approx. 48 users
15 dwellings
3 floors

Year of construction

2002

Total effective area (heated)

2,129 m2

Hot tap water consumption (measured/estimated)

not available

Whole energy consumption for heating purpose after CSTS implementation

79,240 kWh/a
(new building)


System engineering

Year of construction of CSTS

2002

Type of collectors

Vacuum tube collectors

Thermal power

39 kWtherm.

Aperture area of collectors*)

56 m2

Buffer storage

5.0 m3

Hot tap water storage

2.4 m3

Total capacity of boilers with energy source

72 kW
(wooden pellets + natural gas)

Type of hot tap water heating

Decentralised

Type of heating system

Centralised


Costs

Total cost solar system

not available

Cost of the CSTS / gross area of collectors

not available 

Subsidies

not available


Output

Output of solar heat**)

25,000 kWh/a

Reduction of final energy***)

not available

CO2-emissions avoided

not available

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

 


 


Owner

Renaissance GbR
Ettlinger Str. 30
76307 Karlsbad, Germany

Operator

See owner

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

Technical description

 


Description of the CSTS

Year of construction of CSTS

2002

Thermal power

39 kWtherm.

Gross area of collectors

62.4 m2

Aperture area of collectors

56 m2 

Type of collectors

Vacuum tube collectors

Type of assembly

On flat roof

Orientation of collectors

South (0°)

Inclination angle to horizon

45°

Freezing protection

Water (active)

Overheating protection

Expansion vessel plus series vessel

Operation mode

Low-flow

Use of CSTS for

Hot tap water and space heating

Buffer storage

5.0 m3 (400–600 mm EPS-insulated buffer storage with siphon junctions and hydraulically separated circuits)

Hot tap water storage

2.4 m3 (12 × 200 l, thermal stratification storage tanks with external heat exchangers)

Control of backup-system / CSTS

Shared control: Paradigma MES-system control


Hot tap water system

Type of hot water heating

Decentralised

Recirculation system

Yes

For decentralised systems:
The installation on the consumer site


Hot water tanks

Size of storage for hot tap water

0.2 m3 per dwelling
= 2.4 m3 in total

Specification (if necessary)

./.


Space heating system

Type of heating system

Centralised

Number of boilers

2

Total capacity (power output) of boilers

72 kW

Capacity of each boiler (year of construction)

No. 1: 32 kW (2002)
No. 2: 40 kW (2002)

Energy source

Wood pellets and natural gas

Type of boiler system

Gas: condensing


Type of operation

Operator of the CSTS system

Self-operation

CSTS monitoring

Yes: solar energy output

Data accessible via internet

No

Scientific monitoring / follow up

No

Maintenance contract

Yes: 1 to 2 times per year

Visualisation of the solar heat output

No


Yield of CSTS plant

Output of solar heat

25,000 kWh/a

Origin of data

Measured

Measuring point

Between collector and storage

Reduction of final energy

./. (new building)

Origin of data

./.

Solar performance guarantee

No


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

79,240 kWh/a

Origin of data

Measured

Energy used for

Hot tap water and space heating

Whole energy consumption for heating purposes before CSTS implementation

./.
(new building)

Total tap water consumption

not available

Hot tap water consumption

not available

Hot tap water temperature

50 °C

Cold water temperature

ca. 8 °C

 

 


Summary

The heating system consists of 62 m2 vacuum tube collectors, one central 5,000 litres buffer storage tank, a 32 kW pellets heater, a 40 kW natural gas condensing boiler and the Paradigma MES control. If required only the upper stratum (approx. 600 litres) will be heated by the pellets heater – the rest of the buffer storage (4,400 litres) is heated by the solar system only. Collector feed temperature is realised by a speed-controlled solar pump (low-flow resp. matched-flow system). Each house comes with a 200 litres hot tap water storage tank. If required each of the twelve houses gets its needed heat directly from the central buffer storage using the heating network (about 100 m 2-pipe system). Each load (panel heating and / or hot tap water storage) gets the heat by an own pump. Thus, the return is controlled at a maximum of 35 °C. Only requested heat amounts will be delivered from the central buffer into the heating network. If no heat is requested and expected for a defined time span the heating network will be discharged into the buffer storage and turned off. All units of the heating systems are controlled by a LON-Bus system, except of the separate control of the building’s ventilation system. On sunny days, even when the outside temperature falls deep below freezing, the panel heating mostly keeps switched off due to the passive house design. Panel heating will only be switched on when the buildings cannot be directly heated by the sun.




Click for larger view

 

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

Financing and investment

 


Financing of the CSTS

Form of financing

not available

Distribution in percentage

not available


Costs of solar materials

Total cost of solar system

not available

Detailed costs for

not available

Collectors

not available

Elevation / mounting structure

not available

Storage / heat exchanger

not available

Backup heater

not available

Control

not available

Installation

not available

Planning / Engineering

not available

Others: total cost of the residential estate (with an overall effective heated area of 2,129 m2)

3,772,909 Euro


Operation costs of heating system

Or:
Increase of the operation cost after CSTS implementation

not available

 




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

Development & experiences

 


Experiences management

Experienced problems or failures?

No

Found solutions to these problems or failures?

./.


Financial effects / project performance

Project economically efficient?

not available

Fiscal or other financial effects?

not available

Effects on rental fees?

not available


Experiences technical staff

Experienced problems or failures?

not available

Found solutions to these problems or failures?

./

 


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

Downloads

SOLARGE_goodpractice_de_phkarlsbad.pdf

this datasheet in printable PDF-format

1.0 M

phkarlsbad_scheme.pdf

the hydraulic scheme

92 K

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

Photo gallery