SOLARGE

Apartment blocks Reiger, Thorbecke, Lijster and Merel

Sliedrecht, Netherlands

Multi-family house | 4 × 65 sqm installation

 


Project summary · Technical description · Financing · Development · Downloads

Project Summary

Description

In this project the social housing association Tablis Wonen realised a 4 collective solar thermal system each 65 sqm for hot tap water production on four similar apartment blocks with each 80 flats. The project took place as part of an overall renovation of the hot water installations. Small individual gas-fired kitchen tap water heaters that emitted exhaust gasses into the dwellings have been replaced by a central solar hot water system. There are several benefits for the tenants: hot water comfort has been improved, indoor air quality has been improved and problems with moulds on the kitchen walls have been solved due to a lower humidity in the flats. The solar system compensates the increased energy consumption due to central hot water circulation and a higher water consumption.



 


Building

Type of building

Multi Family House

Number of dwellings/floors

4 × 80 dwellings
5 floors

Year of construction

1973

Total effective area (heated)

3,400 m2

Hot tap water consumption (measured/estimated)

1,314 m3/a
(calculated)

Whole energy consumption for heating purpose after CSTS implementation

4 × 71,430 kWh/a
(tap water only)


System engineering

Year of construction of CSTS

2005

Type of collectors

Flat plate collectors

Thermal power

42.1 kWtherm.

Aperture area of collectors*)

60.2 m2

Buffer storage

./. m3

Hot tap water storage

2 m3

Total capacity of boilers with energy source

315 kW, natural gas

Type of hot tap water heating

Centralised

Type of heating system

Centralised


Costs

Total cost solar system

36,800 Euro

Cost of the CSTS/gross area of collectors

570 Euro/m2

Subsidies

not yet, applied for


Output

Output of solar heat**)

4 × 27,660 kWh/a

Reduction of final energy***)

4 × 28,605 kWh/a

CO2-emissions avoided

4 × 5.21 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

 

 


A.L. Bijkerk, Head real estate

"The integral retrofitting of the 4 apartment buildings with a central solar hot water system resulted in a lot of ‘wins’ for the tenants: Better comfort, better indoor air quality, lowered indoor humidity, savings on the energy bill and a contribution to climate change mitigation. This project is part of our ongoing efforts towards more sustainable buildings. So far 800 dwellings, 20% of our building stock, have been equipped with collective solar thermal energy system."

 

 


Owner

Tablis Wonen (Social Housing Association)
A.L. Bijkerk
P.O. Box 145
3360 AC Sliedrecht, Netherlands
Phone: +31 184 444844
Fax: +31 184 444866
info(at)tabliswonen.nl
www.tabliswonen.nl


Operator

Tablis Wonen
P.O. Box 145
3360 AC Sliedrecht,
The Netherlands

Phone: +31 184 444 844
Fax: +31 184 444 866
info(at)tabliswonen.nl
www.tabliswonen.nl

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

Technical description



 


Description of the CSTS

Year of construction of CSTS

2005 (final delivery in March 2006)

Thermal power

42.1 kWtherm.

Gross area of collectors

64.6 m2

Aperture area of collectors

60.2 m2

Type of collectors

Flat plate collectors

Type of assembly

On flat roof

Orientation of collectors

South (0°)

Inclination angle to horizon

50°

Freezing protection

Glycol

Overheating protection

Expansion vessel

Operation mode

High flow

Use of CSTS for

Hot tap water heating

Buffer storage

-/. m3

Hot tap water storage

2 m3
Solar heat storage takes place in tap water

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

1 m3

Specification (if necessary)

per building of 80 dwellings 1 buffer storage of 300 liter (so 3.75 liter/dwelling)


Space heating system

Type of heating system

Centralised

Number of boilers

10 (cascade)

Total capacity (power output) of boilers

250 kW

Capacity of each boiler (year of construction)

all: 25 kW (n. a.)

Energy source

Natural gas

Type of boiler system

Condensing (all)


Type of operation

Operator of the CSTS system

Self operation

CSTS monitoring

No, only telecontrol by installer
(Hot water consumption & Total water consumption)

Data accessible via internet

n. a.

Scientific monitoring & follow up

No

Maintenance contract

Yes, there will be

Visualisation of the solar heat output

No


Yield of CSTS plant

Output of solar heat

27,660 kWh/a

Origin of data

Design (calculated)

Measuring point

Between collector and storage

Reduction of final energy

28,605 kWh/a

Origin of data

Schüco

Solar performance guarantee

No


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

71,430 kWh/a
(tap water only)

Origin of data

Estimated (Schüco)

Energy used for heating of

Hot tap water heating

Whole energy consumption for heating purposes before CSTS implementation

not available
(individual gas bill for hot water charged to tenants)

Total tap water consumption

5,840 m3/a

Hot tap water consumption

1,314 m3/a

Hot tap water temperature

60 °C (tap point)
63–65 °C (boiler)

Cold water temperature

8–12 °C

 

 


Summary

Each one of the four solar hot water systems consists of a 65 sqm collector surface and a storage  volume of 2,000 liter. Solar collectors and storage are seperated by internal coil heat exchanger in the storage tanks. Solar heat is stored in tap water.



 


Solar system supplier 

Schüco Nederland B.V.
Peter van Houtum
Rendementsweg 3a
3641 SK Mijdrecht, The Nethrlands
Phone: +31 297 233670
Fax: +31 297 250162
www.schueco.nl


Solar support frame supplier

Hoefnagels Metaal
Noorsestraat 7
5171 PP Kaatsheuvel, The Netherlands
Phone: +31 416 272885
Fax: +31 416 275315

 

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

Financing and investment

Introduction

The turn-key system delivery cost amounted to 566 EUR/sqm (total 36,800 EUR) paid for by the owner/investor Tablis Wonen. A subsidies application has been done; however no decision has been taken yet whether it will be granted.



Financing of the CSTS

Form of financing

Purchase,
100 % self fincancing

Distribution in percentage

./. % (applied for)


Costs of solar materials

Total cost of solar system

38,800 Euro


Detailed costs for

Collectors

not available

Elevation/mounting structure

7,300 Euro (as part of 36,800 Euro total cost)

Storage, heat exchanger

not available

Back-up heater

not available

Control

not available

Installation

not available

Planning/Engineering

not available

Others

not available


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

A 30% subsidy has been applied for from the province of South-Holland; no decision has been taken yet.

Addresses

 

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

Development & experiences

Quantitative aspects of the CSTS

Installing solar thermal systems fit in the social responibility policy goals of Tablis. Specifically for these flats the hotwater system has been renovated to improve living conditions (no exhaust gasses in the flats, less moist and moulds) and comfort (improved hot water comfort). In order to compensate for the related increase in energy consumption (due to central circulation and increased comfort) the solar systems were added.

­

Tablis Wonen realised four 65 sqm collective solar thermal central hot water system for 4 apprtment buildings with each 80 flats. As part of an overall renovation small individual gas-fired kitchen tap water heaters have been replaced by a central solar hot water system. There are several benefits for the tenants: 1) hot water comfort has been improved; 2) indoor air quality has been improved (no more exhaust gasses, less moist); 3) problems with moulds on the kitchen walls have been solved due to a lower humidity in the flats.

 


Experiences management

Experienced problems or failures?

No, system just recently went into operation
(today: Feb. 2006)

Found solutions to these problems or failures?

not available


Financial effects / project performance

Project economically efficient?

No, not in terms of return on investment; investments are only partly recurred from the tenants; on a net base the tenants do not pay more; Tablis bears the uneconomic part of the investment costs

Fiscal or other financial effects?

No

Effects on rental fees?

No, (net no effect; however the previous lease costs of the individual heaters have been added to the rent)


Experiences technical staff

Experienced problems or failures?

No

Found solutions to these problems or failures?

not available

 

 


Installers

Merel and Lijster block
Boekhorst Klimaat BV
2991 LT Barendrecht, The Netherlands
Phone: +31 180 641064

Reiger and Thorbecke block
Werkendamse Verwarmings Industrie
Ir. Blankenstraat 6
4251 NR Werkendam, The Netherlands
Phone: +31 183 502744
Fax: +31 183 504861
info(at)wvi.nl
www.wvi.nl

 

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

Downloads

SOLARGE_goodpractice_nl_lijsterweg.pdf

this datasheet in printable PDF-format

1.5 M