Building

Type of building

Hotel

Number of users / dwellings, floors

117 users
60 dwellings
4 floors

Year of construction

1968

Total effective area (heated)

5,289 m²

Hot tap water consumption (measured/estimated)

not available

Whole energy consumption for heating purpose after CSTS implementation

not available

System engineering

Year of construction of CSTS

1994 (2004)

Type of collectors

Flat plate collectors

Thermal power

73.5 kW_therm.

Aperture area of collectors^*)

105 m^₂

Buffer storage

4.85 m³

Hot tap water storage

2 m³

Total capacity of boilers with energy source

328 kW, natural gas

Type of hot tap water heating

Centralised

Type of heating system

Centralised

Costs

Total cost solar system

not available

Cost of the CSTS / gross area of collectors

not available

Subsidies

0 %

Output

Output of solar heat^**)

28,000 kWh/a

Reduction of final energy^***)

31,000 kWh/a

CO_2-emissions avoided

6.36 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

Birgitte Wæde,
hotel director:

Owner and operator

Hotel Frederiksdal
Birgitte Wæde
Frederiksdalsvej 360
2800 Lyngby, Dennmark
Phone: +45 45 854333
Fax: +45 45 830036
Frederiksdal(at)dlf.org
www.frederiksdal.dk

Description of the CSTS

Year of construction of CSTS

1994 – reconstructed in 2004

Thermal power

73.5 kW_therm.

Gross area of collectors

105 m²

Aperture area of collectors

30 × 3.5 m² 

Type of collectors

Flat plate collectors

Type of assembly

On flat roof

Orientation of collectors

South (0°)

Inclination angle to horizon

25°

Freezing protection

Glycol

Overheating protection

Expansion vessel

Operation mode

Variable

Use of CSTS for

Hot tap water heating

Buffer storage

4.85 m³ (1 storage tank, DHW on sun alone)

Hot tap water storage

2.0 m³ (DHW from buffer storage and heated by gas boilers)

Control of backup-system / CSTS

Shared control: full CSTS-control to a computer in the reception and a remote control to TAC

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

2.0 m³

Specification (if necessary)

./.

Space heating system

Type of heating system

Centralised

Number of boilers

2

Total capacity (power output) of boilers

328 kW

Capacity of each boiler (year of construction)

No. 1: 105 kW (n. a.)
No. 2: 223 kW (n. a.)

Energy source

Natural gas

Type of boiler system

Low temperature

Type of operation

Operator of the CSTS system

Self-operation

CSTS monitoring

Yes (TAC): temperatures and operation (by hotel staff and TAC)

Data accessible via internet

No

Scientific monitoring / follow up

No

Maintenance contract

Yes: very few

Visualisation of the solar heat output

Yes: production; in the hotel reception

Yield of CSTS plant

Output of solar heat

28,000 kWh/a

Origin of data

Measured

Measuring point

Between collector and storage

Reduction of final energy

31,000 kWh/a

Origin of data

Automatic energy registration

Solar performance guarantee

No

Heat consumption

Whole energy consumption for heating purposes after CSTS implementation

not available

Origin of data

./.

Energy used for

Hot tap water heating, ventilation

Whole energy consumption for heating purposes before CSTS implementation

not available

Total tap water consumption

6,000 m³/a

Hot tap water consumption

not available

Hot tap water temperature

55 °C

Cold water temperature

10 °C

Summary

The system was original build in 1992 with a hot water storage tank and a heat exchanger. In the area the city water is very hard and during the years of operation it became clear that there was a problem concerning the technical solution with the plate heat exchanger. The plant often boiled and the heat exchanger was very often blocked with calcium deposits. The yield from the plant was consequently very low.

Under a rebuilding of the hotel in 2004 the original CSTS plant was reconstructed (tank, expansion, pumps and control system) except the solar panels and main piping between roof and basement.

The reconstruction of the CSTS included two new storage tanks in series, one with a spiral heat exchanger inside for solar loop and the other with a spiral heat exchanger for the central heating system (gas boiler system). A new control and monitoring system was implemented as well.

Planner

Rambøll
Johannes Thuesen
Englandsgade 25
5100 Odense C, Denmark
Phone: +45 65425800
jhst(at)ramboll.dk
www.ramboll.dk

Financing of the CSTS

Form of financing

Purchase

Distribution in percentage

0 %

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

not available

Operation costs of heating system

Increase of the operation cost after CSTS implementation

not available

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?

not available

Experiences technical staff

Experienced problems or failures?

Yes

Found solutions to these problems or failures?

Yes

Addresses

NB-tegnestuen
Thomas Olsen
Vester Strandsbjerg 4A
6959 Ringkøbing, Denmark
Phone: +45 97322100
Fax: +45 97324744
Thomas(at)nbtegnestuen.dk
www.nbtegnestuen.dk

Addresses

TAC A/S
Hørkær 12 B
2730 Herlev, Denmark
Phone: +45 88 20 40 60
info.danmark(at)tac.com
www.tac.com