SOLARGE

Schalkwijk

Haarlem, Netherlands

Multi-family house | 2,900 sqm installation (9 blocks)

 


Project summary Technical description Financing Development Downloads

Project Summary

Description

Nine 40-year old blocks with 382 apartments have been extensively retrofitted (insulation of the building envelope, low glazing and mechanical ventilation) and equipped with solar energy. The system consists of 2,850 sqm glass covered solar collectors, short-term heat storage, aquifer seasonal heat storage, heat pumps and boilers for peak demand. Originally the flats were equipped with small individual gas-fired kitchen tap water heaters. The housing corporations originally planned to install individual combined gas-fired boilers for space heating and hot water. This would however consume scarce living space. The sustainable centralized heating system appeared to be a good alternative. Both the housing corporations and the local government supported this solution and initiated a co-operative venture with a utility company.



 


Building

Type of building

Multi Family House

Number of dwellings/floors

ca. 900 users
382 dwellings
9 blocks
3 and 4 floors

Year of construction

1963

Total effective area (heated)

26,740 m2

Hot tap water consumption (measured/estimated)

12,600 m3/a
(calculated)

Whole energy consumption for heating purpose after CSTS implementation

2,138,000 kWh/a


System engineering

Year of construction of CSTS

2002

Type of collectors

Flat plate collectors

Thermal power

1,995 kWtherm.

Aperture area of collectors*)

2,850 m2

Buffer storage

9 9.5 m3

Hot tap water storage

./. m3

Total capacity of boilers with energy source

9 38 kW
+ Heat pump

Type of hot tap water heating

Centralised

Type of heating system

Centralised per block


Costs

Total cost solar system

1,825,000 Euro

Cost of the CSTS/gross area of collectors

624 Euro/m2

Subsidies

35 %


Output

Output of solar heat**)

1,433,000 kWh/a

Reduction of final energy***)

4,989,000 kWh/a
Overall savings due to retrofit, and overall installation (CSTS, heat pump, seasonal storage)

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

 

 


John Braakman,
Eneco Energie:

"The future for an energy utility on the long term will depend on its innovative power. We intend to stay market leader for the implementation of large scale solar thermal systems for apartment buildings"

 

 


Owner

Eneco Energie (system investor and ESCO)
John Braakman
Diakenhuisweg 3943
Haarlem, Netherlands
Phone: +31 23 5103456
Fax: +31 23 5103457
www.eneco.nl


Operator

see Owner

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Technical description

 


Description of the CSTS

Year of construction of CSTS

2002

Thermal power

1,995 kWtherm.

Gross area of collectors

2,925 m2

Aperture area of collectors

2,850 m2

Type of collectors

Flat plate collectors

Type of assembly

Roof top

Orientation of collectors

South (0)

Inclination angle to horizon

20

Freezing protection

Drain back

Overheating protection

Drain back

Operation mode

High flow

Use of CSTS for

Hot tap water heating, Space heating

Buffer storage

9.5 sqm per building; number of storages: 9 for each building; volume per storage: 9.5 sqm
Additionally there is an underground aquifer seasonal heat storage at 110 m depth (natural temp. 12C, in summer time raised to 45C); heat storage capacity 1,155 MWh

Hot tap water storage

./. m3

Control of backup-system/CSTS

Shared control
The surplus solar heat in summer is stored in the central aquifer storage at a temperature of 45C. In winter, the heat is extracted and used for preheating and as heat source for the heat pumps.


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

./. m3

Specification (if necessary)

No storage of hot tap water. The storage takes place in the 9.5 sqm buffer storage and hot water is produced via a heat exchanger


Space heating system

Type of heating system

Centralised

Number of boilers

1 heat pump + 1 peak boiler per block

Total capacity (power output) of boilers

38 kW per block

Capacity of each boiler (year of construction)

No.1: 38 kW (2003)
No.2: 217 kW (1995)

Energy source

Natural gas

Type of boiler system

Condensing


Type of operation

Operator of the CSTS system

ESCO

CSTS monitoring

Yes
Output of solar heat, Total water consumption, Space heating; contribution aquifer heat storage etc.

Data accessible via internet

No

Scientific monitoring & follow up

Yes

Maintenance contract

Yes (ESCO)

Visualisation of the solar heat output

No


Yield of CSTS plant

Output of solar heat

1,433,000 kWh/a

Origin of data

Design (calculated)

Measuring point

Between collector and storage
(collector output)

Reduction of final energy

4,989,000 kWh/a

Origin of data

Monitoring (Design)

Solar performance guarantee

No


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

2,138,000 kWh/a (design)

Origin of data

Estimated

Energy used for heating of

Hot tap water heating, Space heating

Whole energy consumption for heating purposes before CSTS implementation

7,127,000 kWh/a

Total tap water consumption

50,300 m3/a

Hot tap water consumption

12,600 m3/a

Hot tap water temperature

60 C

Cold water temperature

915 C

 

 


Summary

Nine 40-year old blocks with 382 apartments have been retrofitted and equipped with solar energy. The system consists of 2,850 sqm glass covered solar collectors, short-term heat storage, aquifer seasonal heat storage, heat pumps and boilers for peak demand. The energy savings according to the design amount to 70 %.











 


Planner


Installer


Producer

 

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Financing and investment

Introduction

Eneco Energie is investor and CSTS system owner. Eneco energie sells heat and hot water to the apartment owners. On the overall investment 35 % of grants have been received.


 


Financing of the CSTS

Form of financing

Purchase,
65 % self fincancing

Distribution in percentage

35 %


Costs of solar materials

Total cost of solar system

1,825,000 Euro, excl. VAT for CSTS.
Overall project costs: 5,335,000 Euro


Detailed costs for

Collectors (including piping, control and installation)

910,000 Euro

Elevation/mounting structure (including installation)

690,000 Euro

Storage, heat exchanger

not available

Back-up heater

not available

Control

not available

Installation

not available

Planning/Engineering

10,000 Euro

Others
Safety measures for work on roof
Profit and risk
Perparation
Bank guarantee
Seasonal storage


118,000 Euro
86,000 Euro
10,000 Euro
1,800 Euro
189,000 Euro


Operation costs of heating system

Power cost for pumping

not available

Maintenance cost

not available

Monitoring cost

not available

Other operation cost

not available

Total operation cost

not available

or: Increase of the operation cost after CSTS implementation

not available

 

 

Special note for subsidy systems in the partner country

Grants: 1,856,000 EUR
Tax credits:
Yes, EIA (energy investment tax deduction)
Others: Avoided exploitation costs of conventional installation (net present value); paid by the housing associations to Eneco Energie: 182,000 EUR
Split-up of grants:
Province 1,134,000
Municipality 227,000
SenterNovem 495,000

 

 

Addresses

 

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Development & experiences

Quantitative aspects of the CSTS

When buildings are integrally renovated they need to comply to the building codes for new buildings.
This is a sales value for Eneco.

The future for an energy utility on the long term will depend on its innovative power. Innovation thats meets our social responsibility goals and enables the long-term continuity of our business. These are the drivers for developing the renewable energy market. In the past 10 years Eneco Energie realized more than 50 large scale solar thermal systems in the housing sector. An efficient organization that can initiate, implement and operate large scale solar thermal systems has been built. The 2 WM project is part of the continuous innovation process that we aim at. We intend to stay market leader for the implementation of large scale solar thermal systems in the housing sector.


Experiences management

Experienced problems or failures?

Yes

Found solutions to these problems or failures?

Yes


Financial effects / project performance

Project economically efficient?

Yes

Fiscal or other financial effects?

not available

Effects on rental fees?

Yes


Experiences technical staff

Experienced problems or failures?

Yes

Found solutions to these problems or failures?

Yes

 

 


Addresses

 

Top of page Project summary Technical description Financing Development Downloads

Downloads

SOLARGE_goodpractice_nl_schalkwijk.pdf

this datasheet in printable PDF-format

1.3 M

2MW-project-Schalkwijk_s1l.jpg

technical scheme 1

43 K

2MW-project-Schalkwijk_s2l.jpg

technical scheme 2

23 K

2MW-project-Schalkwijk_s3l.jpg

technical scheme 3

62 K