SWEGON AIR ACADEMYBENGT DAHLGREN

The presentation

• Background, project in context

• Energy goals – balancing expectations

• Technical systems

• Results (measurements so far…)

• Experiences; what would we do or not do again.

• The next project; improvements being made

A clean sheet

• New building, a chance to influence;

• Energy efficiency

• Cost efficency

• Low maintenance

Location, location, location

Location, location, location

Comparing climate

Outside air dry-bulb temperature °C

-15

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-5

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KaunasGothenburg

ASHRAE IWEC Weather File for Kaunas(c) 2001

Comparing climate

Solar Radiation, South facade W

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KaunasGothenburg

ASHRAE IWEC Weather File for Kaunas(c) 2001

Location, location, location

• Decision to rent, to be activity involved in the design process and influence the architect.

• Area; is a 19th century factory, must keep style.

• Developer chose the architect.

• Location offered the comms looked for and the space for 200 employees (4300m²)

Building Structure

• 6 stories

• Steel and concrete construction

• Technical rooms on top floor

• Conference rooms; ground floor.

• 4 office floors

Energy exceptations

• Total energy usage for building and tennant; calculated 75kWh/m²a

• Current Swedish building code (climate and hot water); 100kWh/m²a

• NB! 2012 climate zone 3; 80kWh/m²a

• Green Building status…no problem

System thinking

• Use best available proven technology.

• 100% Demand Control Systems.

• Use free cooling as much as possible.

• Good quality and characteristics of facade and solar shading.

Calculated energy requirements

• Heat 23 kWh/m2

• Hot water 3 kWh/m2

• Heat energy from server -9 kWh/m2

• Building services equipment(fans, pumps, lifts) 19 kWh/m2

• Cooling 11 kWh/m2

• Solar panels -1 kWh/m2

• Total building energy 46 kWh/m2(with 20% s.f.)

Calculated energy requirements

• Lighting, computers etc 18 kWh/m2

• Server room cooling 4 kWh/m2

• Server electricity 12 kWh/m2

• Kitchen 3 kWh/m2

• Security system 3 kWh/m2

• Outside lighting & sign 3 kWh/m2

Operations energy 43 kWh/m 2

TOTAL 89 kWh/m 2

Converging views

• Architect; 90% glass

• BD; 40% glass

• Developer; needs to be convinced BD are right.

• Goal between BD and developer before starting; at least greenbuilding (national regulation -25%)

Converging views

Converging views

Windows

• BD completed energy calcs from 40-85% window area.

• Why 60%? Landlords experience from previous tenants other buildings, good day-light penitration.

• Swedish Hertitage demanded the building looks right in the old factory area.

• 40% too low light penitration, 85% bad energy performance (BD calcs)

• What happened;Compromise; 60% glass (U=0.85W/m²K)

Air please

• Target is cat.B (ISO 7730);

90% people satisfied (or 10% unsatisfied)

• Cooling with air, heating with water (district heating)

• Demand Controlled ventilation (DCV), diviation from set points allowed.

• Sensors; temp, CO2 in conference room, VOC on each floor.

Air please

Low energy room climate control

RADIATOR

CORRIDOR

DCV diffuser

Connect

OFFICE ROOM

DCV diffuser

Adapt

24VACModBusRadiator valve controlModule cable DCVJunction connectiom

Connection to several diffusers

Connection,,

(Only in conference room)

CO2-sensor

Against traditionParallel Air handling units

How it worksE

nerg

y (S

FP

)

Air flow (l/s)

Operating range

2nd unit starts

Ventilation

Heat

• District heating when internal heat loads and the sun is not enough.

• Heating with radiators sequenally controlled with supply air diffusers.

• Spill heat from cooling machine used for hot water and radiators.

Heat

Heat

Cooling

• Air/ Water heat pump to DX coil in AHU.

• Heat pump place in exhaust air stream.

• Separate cooling system for server room.

Power and lighting

• Occupancy detectors and light intensity controlled.

• Occupancy control electrical sockets (50%)

Shades

• Active solar shading – angle and deployment in 9 zones.

• Self preservation; wind >25 m/s

Shades

• Functions:

Keep cool, keep heat

Conclusion

• Late summer 2011

• Greenbuilding status

• Swedish state check energy use after 2 years

• Total goal 75kWh/m2a, but calcs show 85.

• 15-20% safety factor.

• Building energy: 50kWh/m2a.

Messured energy usage

• Heat 19 (23) kWh/m2

• Hot water 3,4 (3) kWh/m2

• Heat energy from server - (-9) kWh/m2

• Building services equipment(fans, pumps, lifts) 14 (19)

kWh/m2

• Cooling 6,6 (11)kWh/m2

• Solar panels -1,3 (-1) kWh/m²

Total building energy 42 (46) kWh/m²

Operations energy 36 (43)kWh/m²

TOTAL 78 (89) kWh/m²

The future

The future

The future

The future

The future