SOLARGE

Vèrtix – Sant Boi de Llobregat

Sant Boi de Llobregat, Spain

Multi-family house | 58 sqm installation  

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Project summary · Technical description · Financing · Development · Downloads

Project Summary

Description

New residential building (20 dwellings) with solar thermal uncovered collectors integreted in an inclined roof.

The main reason to install the CSTS was the Sant Boi de Llobregat Solar Ordinance. By this municipality ordinance one is obliged to install solar thermal systems in new buildings for hot water preparation with a minimum solar fraction of 60 %.

This building was the first VERTIX building were uncovered solar thermal collectors were integrated in an inclined roof. The solar storages are distributed de-centrally and are connected in series to a modulated combination boiler (for space heating and hot water preparation).

VERTIX was satisfied with the realized solution but has not applied this solution to other buildings yet, mainly because of the investment costs.

 




 


Building

Type of building

Multi-family house

Number of users / dwellings, floors

100 users
20 dwellings
3floors

Year of construction

2005

Total effective area (heated)

not available

Hot tap water consumption (measured/estimated)

1,095m3/a
(calculated)

Whole energy consumption for heating purpose after CSTS implementation

31,969kWh/a


System engineering

Year of construction of CSTS

2005

Type of collectors

Uncovered collectors

Thermal power

38kWtherm.

Aperture area of collectors*)

54.6m2

Buffer storage

3.0 m3

Hot tap water storage

./. m3

Total capacity of boilers with energy source

480 kW, natural gas

Type of hot tap water heating

Decentralised

Type of heating system

Decentralised


Costs

Total cost solar system

67,338 Euro

Cost of the CSTS / gross area of collectors

1,153 Euro/m2

Subsidies

0 %


Output

Output of solar heat**)

16,113 kWh/a

Reduction of final energy***)

20,141 kWh/a

CO2-emissions avoided

4.75 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

 

 



Rafael Lopez Romera, Vertix: "The Sant Boi del Llobregat roof integrated CSTS installation was a success. The tenants, the technical staff, the architect and other involved parties in the building process, were satisfied with the selected solution. Due to the lack of problems during the installation phase and no problems were reported during the exploitation phase till now, this system is considered as one of the best solar thermal systems realized by VERTIX."

 

 


Owner

VÈRTIX
Rafael López and Antoni Esqué
c/ Can Ràbia, 11, Local
E-Barcelona, Spain
Phone: +34 93 2063476
Fax: +34 93 2051586
rlopez(at)vertix.es
www.vertix.es


Operator

See owner

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Technical description

 


Description of the CSTS

Year of construction of CSTS

2005

Thermal power

38 kWtherm.

Gross area of collectors

58.4m2

Aperture area of collectors

54.6m2 

Type of collectors

Uncovered collectors

Type of assembly

Roof-integration

Orientation of collectors

South-West (+25°)

Inclination angle to horizon

16.7 °

Freezing protection

Glycol

Overheating protection

Expansion vessel

Operation mode

Low flow

Use of CSTS for

Hot tap water heating

Buffer storage

3.0 m3 (20 × 150 l)

Hot tap water storage

./. m3

Control of backup-system / CSTS

Separated control:
back backup-system has its own differential thermostat


Hot tap water system

Type of hot water heating

Decentralised

Recirculation system

No

For decentralised systems:
The installation on the consumer site

Individual gas boilers

Size of storage for hot tap water

./. m3

Specification (if necessary)

./.


Space heating system

Type of heating system

Decentralised

Number of boilers

20

Total capacity (power output) of boilers

480 kW

Capacity of each boiler (year of construction)

all: 24 kW (2005)

Energy source

Natural gas

Type of boiler system

Standard


Type of operation

Operator of the CSTS system

Self-operation

CSTS monitoring

No

Data accessible via internet

No

Scientific monitoring / follow up

No

Maintenance contract

Yes: twice a year

Visualisation of the solar heat output

Yes: each solar storage is equipped with a thermometer


Yield of CSTS plant

Output of solar heat

16,113 kWh/a

Origin of data

Design (calculated)

Measuring point

not available

Reduction of final energy

20,141 kWh/a

Origin of data

Calculation with POLISUN

Solar performance guarantee

No


Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

31,969 kWh/a

Origin of data

Estimated: from official key numbers

Energy used for

Hot tap water heating

Whole energy consumption for heating purposes before CSTS implementation

52,110 kWh/a

Total tap water consumption

unknown

Hot tap water consumption

1.095 m3/a

Hot tap water temperature

45 °C

Cold water temperature

12 °C

 

 


Summary




 



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Financing and investment

Introduction

VERTIX did not sent in any application for subsidies, although they were available. They were informed by the installers about this possibility, but VERTIX was not interested.
The costs of the CSTS were incorporated to the final cost of the dwellings. This means the tenants paid for the system, of course with lower operational costs for hot water preparation.


 


Financing of the CSTS

Form of financing

Purchase

Distribution in percentage

0 %


Costs of solar materials

Total cost of solar system

67,338Euro

Detailed costs for

Collectors

9,472 Euro

Elevation / mounting structure

11,978 Euro

Storage / heat exchanger

13,640 Euro

Backup heater

not included

Control

6,060 Euro

Installation

18,400 Euro

Planning / Engineering

included in rest

Others

7,800 Euro


Operation costs of heating system

Or:
Increase of the operation cost after CSTS implementation

not available

 



The project developer VERTIX financed the CSTS installation themselves without applying for subsidy or special loans.

 



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Development & experiences

Qualitative aspects of the CSTS

The technical staff of VERTIX always explores the possibility to go beyond the legal framework, however the management staff had decided to stick to the minimum legal requirements due to additional investment costs.


 


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?

No

Effects on rental fees?

No


Experiences technical staff

Experienced problems or failures?

No

Found solutions to these problems or failures?

./.

 



Installers

Serveix Elèctrics d‘Abrera, S.L.
Rafael Rodríguez
c/ Sant Jaume, 34
Abrera, Spain
Phone: +34 93 77384-84
Fax: +34 93 77384-88

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Downloads

SOLARGE_goodpractice_es_santboi.pdf

this datasheet in printable PDF-format

0.9 M

santboi_scheme.pdf

the hydraulic scheme

150 K

santboi_scheme_bw.pdf

the hydraulic scheme (for monochrome printers)

130 K

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

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