Delta Cool - RIBA Product Selector

DELTA® protects property. Saves energy. Creates comfort.
Bring climate change
to your office
DELTA®-COOL
P R E M I U M Q U A L I T Y

P R E M I U M Q U A L I T Y
■ 2

Stay cool – even without
air conditioning
Heat impairs efficiency and health at work
Heat build-up causes discomfort
A current medical health study finds
that 40 % of Germans feel that their
health is impaired by air conditioning.
Air conditioning consumes
expensive energy
Historical buildings, churches, castles, and
similar structures all have an adequate
thermal-storage mass for retaining heat
energy, so that interiors remain nice and
cool in summer. Modern lightweight constructions
lack this thermal-storage capacity,
so that room temperatures may quickly rise
to a level that is equal to or even higher than
the temperature outside.
The conventional way of solving this problem
is to install expensive air-conditioning
systems – with all their well-known economic,
ecological, and medical drawbacks.
■ Change to DELTA®-COOL by Dörken,
the innovative, energy-saving solution
for landscape offices, lightweight and
steel-skeleton structures, and other
large buildings.
3 ■

The easy way to
a feelgood atmosphere
Smart temperature management through PCM
DELTA®-COOL:
PCM for passive climate control
This phase change material (PCM) works like a
heat storage unit. It consists of salt hydrates
which, unlike paraffins, are not combustible.
This makes DELTA®-COOL ideal for use even in
buildings where fire-prevention requirements
are stricter than normal.
Under the influence of heat, DELTA®-COOL
changes its state of aggregation from solid to
liquid as it reaches its melting temperature.
The heat thus stored is emitted again as soon
as the phase change is reversed. In this way,
temperature fluctuations may be mitigated
and temperatures peaks prevented without
any need to expend energy on cooling.
Advantages of the DELTA®-COOL System
■ Non-combustible, non-toxic,
flame-retardant.
■ Comfortable interior climate without
irritating noise and dangerous draughts.
■ Lower perceived temperatures through
additional cooling surfaces.
■ High energy density at 22 °C to 28 °C;
1 litre of DELTA®-COOL will absorb as
much energy as 10 litres of water.
■ Any additional energy input that
may be required can be moved to
the cheaper hours of the night.
■ Energy stored during the day may
be used at night.
■ In the event of a removal or room
rededication, PCMs can be moved
or rearranged.
■ Little time and space required for
installation.
■ Another economic advantage:
no servicing and operating expenses.
Concrete
Masonry Massive pine wood Lightweight construction
DELTA®-COOL
= = = =
24 cm 36 cm 38 cm 226 cm 2 cm
P R E M I U M Q U A L I T Y
Various material thicknesses having aheat-storage capacity of 5,700 kJ (10 °C temperature increase)
Typical circadian temperatures in rooms with and without DELTA®-COOL
32
■ With DELTA®-COOL 24
■ Without DELTA®-COOL 24
■ Outside air
Heat emission
30
28
26
24
22
20
Heat absorption
18
16
Temperature [°C]
14
12
19.9.
3:00 6:00 9:00 12:00 15:00 18:00 21:00
Time
20.9.
■ Small volume, great effect:
the cool answer
to hot energy prices!
■ 4

5 ■

DELTA®-COOL:
the versatile energy saver
Ideal for landscape offices and other large structures
These references speak for themselves …
P R E M I U M Q U A L I T Y
Gästehaus Pollmeier
Pollmeier Massivholz GmbH & Co. KG
operates the largest and most advanced
hardwood sawmills in Europe. At its headquarters
in Creuzburg, Thuringia, the company
has its own guesthouse which was
completed in 2006. Its elegant, lightweight
design is ideal for using DELTA®-COOL to
save both space and energy.
Typology
Commercial buildings/hotels
and accommodation
Owner
Pollmeier Massivholz
GmbH & Co. KG
Design
Cornelsen + Seelinger, architects,
Darmstadt, Berlin, Amsterdam,
www.cornelsen-seelinger.com
Floorspace 670m2
Gross volume 4,049m3
Primary energy
consumption 16 % EnEV
Photos
Cornelsen + Seelinger Architekten,
www.cornelsen-seelinger.com
Ludwig Erhard School, Karlsruhe
The pavilion on the school premises was
enlarged by 12 classrooms by adding an
annex and another floor. All new rooms
receive light and ventilation from two
sides to ensure efficiency and sustainability
together with low maintenance costs.
The ventilation system features latent-heat
storage to optimise energy consumption.
Typology
Owner
Architects
Total floorspace
Volume
Award
Photos
Public buildings/schools
City of Karlsruhe
(Building Department)
Assem Architekten, Karlsruhe,
www.assemarchitekten.de
1,575m2 (extension only)
6,700m3 (extension only)
Wood construction prize,
Baden-Württemberg 2009
© stephan baumann,
karlsruhe, www.bild-raum.com
Rehabilitation and reconfiguration of a
reception area at a corporate head office
The owner wished to rehabilitate his head
office from the ground up and create office
floorspace that is flexible enough to permit
readjusting the ground-plan effortlessly
for years. The central corridors are multifunctional
areas offering space for copiers,
cabinets, and a tea point. The offices are
remarkable because they are not equipped
with conventional air conditioning. Instead,
climate control is assured by DELTA®-COOL
latent-heat storage units installed in the
ceiling.
Typology
Commercial buildings/
administration buildings
Owner
Dörken Service GmbH
Architects Frielinghaus Schüren Architekten,
Witten,
www.frielinghaus-schueren.de
Net floorspace c. 1,150m2 overall
Volume c. 10,500m3
■ 6
Photos
© Peter Strehl,
ps@frielinghaus-schueren.de;
© michael schilderoth,
herdecke, www.schilderoth.com

Interior climate improvement with DELTA®-COOL – typical simulation
36
34
32
30
Temperature [°C]
28
26
24
22
20
18
16
14
July 1 July 2 July 3
00 h
12 h
00 h
12 h
00 h
Histogram showing interior temperatures in a rehabilitated lightweight building with and without PCM in midsummer
■ Interior temperature without PCM
■ Interior temperature with PCM
12 h
Dynamic building simulations serve to
generate meaningful histograms. This ex am -
ple shows three simulations of a rehabilitated
canteen in Aschaffenburg. Room
size: 15 x 30 m. Roof sloping from 3 to 4 m.
30 m southern facade with 42 % of externally
shaded windows. Standard glazing.
Floor and outer wall of reinforced concrete.
Interior walls and flat roof of lightweight
construction. Max. heat load 55 W/m2. No
mechanical ventilation. Free exchange of
air at a rate of 0.2 l/h. Suspended plasterboard
ceiling completely covered with
DELTA®-COOL.
The result: the interior climate remains
balanced even in midsummer periods of
heat, and temperatures peaks are mitigated.
Hours per year
600
500
400
300
200
Without
PCM
100
With
PCM
0
Hours of excessive heat with temperatures above 26 °C
Hours per year
3500
3000
2500
2000
1500
1000
500
Without
PCM
With
PCM
0
Hours of heating with temperatures below 21°C
■ See for yourself! All the data
you need for your own thermal
simulation programme are
obtainable from Dörken.
7 ■

Passive climate control:
innovative and cost-efficient
The DELTA®-COOL method
Protects your purse and the environment
The DELTA®-COOL System solution can be
installed quickly and lasts extremely long.
Tests demonstrate the capability of the
material to continue functioning safely for
25 years without maintenance or loss of
performance. Its life is markedly longer
than that of a conventional air conditioner.
Structural prerequisites for
the DELTA®-COOL System
■ Ceiling panels should have good heat
conductivity; metal panels are ideal.
■ Whenever insulating materials such as
mineral fibres or plasterboard are used,
make sure that air from the room can
flow around DELTA®-COOL in the ceiling
cavity.
■ There should be natural or mechanical
ventilation to ensure that charged PCMs
can release their heat at night.
■ Like any other natural cooling system,
PCMs should not be exposed to extreme
heat, such as direct insolation.
Histogram showing the prices of electricity, fuel oil and natural gas
P R E M I U M Q U A L I T Y
■ Electricity ■ Fuel oil ■ Natural gas
1999 2001 2003 2005 2007 2009 2011 2013 2015 2017 2019
35
30
25
20
15
10
5
0
Price [Cent/kWh]
■ 8

9 ■

P R E M I U M Q U A L I T Y
■ 10

The economical solution
DELTA®-COOL: this cooling system soon breaks even
Sample calculation
In this example, the efficiency of a new office
building was calculated in conformance
with the annuity method as laid down in
VDI 2067. The following constraints apply:
■ Night-time cooling through electronically
controlled ventilation flaps
■ Functioning interior cross-ventilation
■ Period under consideration: 25 years
■ Interest factor: 6 %;
price increase rate: 3 % p.a.
The result:
Savings on maintenance and operating
costs quickly surmount the somewhat
higher cost of investment. All in all, there
will be annual savings compared to other
cooling systems.
Specific costs over 20 years
350
300
30 Euro
■ Energy costs
■ Operating costs
■ System costs
250
Costs [Euro/m 2 ]
200
150
111 Euro
29 Euro
89 Euro
7 Euro
100
30 Euro
50
155 Euro
103 Euro
86 Euro
0
Cooling ceilings Air cooling PCM with exhaust system
Electricity consumption
14
Electricity consumption [kWh/m2
NGFa ]
12
10
8
6
4
2
0
5,2
6
5,7
6
■ Power draw,
nighttime ventilation
■ Cooling
■ Power draw,
daytime ventilation
0,7
1,5
Cooling ceilings Air cooling PCM with exhaust system
11 ■

DELTA®-COOL:
for a better office climate
Facts in brief
Technical data, DELTA®-COOL 24
Basic material
Salt hydrate
Flammability DIN EN 13501-1
Melting temperature 22 – 28 °C
Crystallisation temperature 22 °C
Cooling performance
25 – 40 W/m2
Melting energy
158 kJ/kg = 44 Wh/kg
Density (solid/liquid)
1.6/1.5 kg/L
Thermal capacity (solid/liquid) 2.7/2.2 kJ/kg K
Thermal conductivity (solid/liquid) 1.12/0.56 W/m K
Maximum temperature 60 °C
Weight
4.0 kg
(of which 3.0kg DELTA®-COOL 24)
Dimensions/application
610 x 610 x 17 mm
Hazard warning: R 36 – eye irritant. Safety advice: S 2 – keep away from children.
S 26 – after eye contact, rinse thoroughly with water and consult a physician immediately.
DELTA®-COOL Board
DELTA® is a registered trademark of Ewald Dörken AG, Herdecke, Germany.
Quick, easy installation
Dörken GmbH & Co. KG
DELTA Membrane Systems Ltd.
Wetterstraße 58
Delta House
D-58313 Herdecke Merlin Way, North Weald
Tel.: +49 23 30/63-0
Epping, Essex, CM16 6HR.
Fax: +49 23 30/63-355 Tel: +44 (0)1992 523523 Fax: +44 (0)1992 523250
bvf@doerken.de
Email:info@deltamembranes.com
www.doerken.de
Web: www.deltamembranes.com
A company of the Dörken Group