SOLARGE

Sperwerflat I

Sliedrecht, Netherlands

Multi-family house | 90 sqm installation

 


Project summary · Technical description · Financing · Development · Downloads

Project Summary

Description

The social housing association Tablis Wonen realised a 90 sqm collective solar thermal system for hot tap water production on an appartment complex with 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 Small individual gas-fired kitchen tap water heaters that emitted exhaust gases into the dwellings have been replaced by a central solar hot water system.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
(no more exhaust gases, less moist);
· problems with moulds on the kitchen walls have been solved due
to a lower humidity in the flats.

The collective solar energy system provides in about 35 % of the hot water demand. The solar system compensates the increased energy consumption due to central hot water circulation and higher water consumption (increased comfort).



 


Building

Type of building

Multi Family House

Number of dwellings/floors

80 dwellings
10 floors

Year of construction

1968

Total effective area (heated)

8,746 m2

Hot tap water consumption (measured/estimated)

1,784 m3/a
(measured)

Whole energy consumption for heating purpose after CSTS implementation

110,298 kWh/a


System engineering

Year of construction of CSTS

2003

Type of collectors

Flat plate collectors

Thermal power

62.3 kWtherm.

Aperture area of collectors*)

89 m2

Buffer storage

./. m3

Hot tap water storage

3 m3

Total capacity of boilers with energy source

687 kW, natural gas

Type of hot tap water heating

Centralised

Type of heating system

Centralised


Costs

Total cost solar system

50,211 Euro

Cost of the CSTS/gross area of collectors

564 Euro/m2

Subsidies

31 %


Output

Output of solar heat**)

39,900 kWh/a

Reduction of final energy***)

57,000 kWh/a

CO2-emissions avoided

10.5 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

 

 


A.L. Bijkerk, Head real estate

"The integral retrofitting of the Sperwer building 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. Since this project 8 other buildings have been equipped with a similar central solar hot water system."

 

 


Owner

Tablis Wonen
(Social Housing Association)
A.L. Bijkerk
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


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

2003

Thermal power

62.3 kWtherm.

Gross area of collectors

89 m2

Aperture area of collectors

89 m2

Type of collectors

Flat plate collectors

Type of assembly

on flat roof

Orientation of collectors

South (0°)

Inclination angle to horizon

Freezing protection

Drain back

Overheating protection

Drain back

Operation mode

High flow

Use of CSTS for

Hot tap water heating

Buffer storage

-/. m3

Hot tap water storage

3 m3

Control of backup-system/CSTS

Separated control: The control cares for a temperature difference between collector and storage of 10 K. The collector pump will be switched off at a temperature difference of 2 K.


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)

Central


Space heating system

Type of heating system

Centralised

Number of boilers

2

Total capacity (power output) of boilers

687 kW

Capacity of each boiler (year of construction)

No.1: 470 kW (1995)
No.2: 217 kW (1995)

Energy source

Natural gas

Type of boiler system

No.1: Standard
No.2: Condensing


Type of operation

Operator of the CSTS system

Self operation

CSTS monitoring

Yes
Solar radiation, Output of solar heat, Total water consumption, Hot water consumption; Comparison of input and output

Data accessible via internet

Yes

Scientific monitoring & follow up

No

Maintenance contract

Yes
once a year

Visualisation of the solar heat output

Yes: www.zonnewijzer.info


Yield of CSTS plant

Output of solar heat

39,900 kWh/a

Origin of data

Measured

Measuring point

Between storage and piping to taps
(solar system output)

Reduction of final energy

57,000 kWh/a

Origin of data

Monitoring
(meter readings)

Solar performance guarantee

No


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

110,298 kWh/a

Origin of data

Measured

Energy used for heating of

Hot tap water heating

Whole energy consumption for heating purposes before CSTS implementation

not available

Total tap water consumption

6,800 m3/a

Hot tap water consumption

1,784 m3/a

Hot tap water temperature

65 °C

Cold water temperature

10–15 °C

 

 


Summary

The solar hot water system consists of a 90 sqm collector surface and a storage volume of 3,000 liters.

Solar collectors and storage are seperated by a plate heat exchanger. Solar heat is stored in tap water.



Hydraulic scheme not yet available

 


Planner

GTI Utiliteit
P.O. Box 2064
2990 DB Barendrecht,
The Netherlands

Phone: +31 180 656 900
Fax: +31 180 656 999
www.gti.nl


Installer

see Planner


Producer

ITHO
P.O. Box 21
3100 AA Schiedam,
The Netherlands

Phone: +31 10 427 8500
Fax: +31 10 427 8888
info(at)itho.nl
www.itho.nl

 

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

Financing and investment

Introduction

The turn-key system delivery cost amounted to 564 EUR/sqm (total 50,000 Euro) paid for by the owner/investor Tablis Wonen.

Subsidies have been granted form three sources for in total 31 % of the cost.


 


Financing of the CSTS

Form of financing

Purchase,
69 % self fincancing

Distribution in percentage

31 %


Costs of solar materials

Total cost of solar system

50,211 Euro


Detailed costs for

Collectors

not available

Elevation/mounting structure

not available

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

The subsidy is a mix of 3 items:

  1. Contribution from the project Ruimte voor zonnewarmte (Space for Solar)
  2. Energy Performance Regulation (national programme to support RE and EE)
  3. Subsidy of the energy utility Eneco

 

 

 

Addresses

Stichting Platform Ruimte voor zonne-energie (PLUS subsidy of national Energy Performance Regulation PLUS subsidy of Energy Utility company)
Frank Zegers
P.O. Box 8408 3503 RK Utrecht
3503 RK Utrecht
The Netherlands

Phone: +31 30 2808 313
Fax: +31 30 2808 301
F.Zegers(at)ecofys.nl
www.ruimtevoorzon.nl

 

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 responsibility policy goals of Tablis. Specifically for these flats the hotwater system has been renovated to improve living conditions (no exhaust gases 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.

Summary of experiences / Notices to the project performance
Tablis Wonen realised a 90 sqm collective solar thermal central hot water system for 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 gases, less moist); 3) problems with moulds on the kitchen walls have been solved due to a lower humidity in the flats. The collective solar energy systems provides in about 35% of the hot water demand. The solar system compensates the increased energy consumption due to central hot water circulation and a higher water consumption (increased comfort).

 


Experiences management

Experienced problems or failures?

Yes

Found solutions to these problems or failures?

Yes


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


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_sperwerflatI.pdf

this datasheet in printable PDF-format

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