“PROTOTYPE ENERGY AUTONOMOUS ”

Munich, 24 September 2008

BUILDING LAYOUT • 6 floors – 2 floors for offices – 4 floors for apartments • Conventional building annual energy requirements: – Thermal energy: 131 MWh – Cooling energy: 185 MWh – Electric energy: 17 MWh • Prototype building annual energy requirements: – Thermal energy: 37,8 MWh – Cooling energy: 54 MWh – Electric energy: 15 MWh Bioclimatic architecture Adopted basic principles of bioclimatic architecture ØExternal insulation Ø typical wall (double brick, 5cm insulation) 1,5 W/m2K) ØExternal insulation, thermal plaster (0,5 W/m2K) ØThermal break aluminum profiles with special crystals ØTypical profiles (plain aluminum and single glass) 3,5 W/m2K 2 SP01 32,0°C ØThermal break and triple glass 1,4 W/m K 32 ØLow light bulbs 31 RESULTS OF PASSIVE MEASURES: ü50-70% reduction in heating energy needs 30 ü50-70% reduction in cooling energy needs 29 üsmaller installed power

ügreat overall thermal behaviour of the 28 building 28,0°C Computational Simulations Natural – Forced Ventilation Studies Ø3D structural modeling ØAir velocity simulation ØTemperature distribution simulation ØHumidity distribution simulation (latent loads) ØThermal radiation simulation ØInternal gains simulation ØAir dispersment

RESULTS OF PASSIVE MEASURES: üQuantification of passive energy design tools üMinimalisation of installed power in energy systems üMinimalisation of capital investment Computational Fluid dynamics Simulations Computational Fluid dynamics Simulations Central Solar Thermal Field High Efficiency Solar Collectors

Used to cover the thermal needs for the whole building.

•Winter period •Producing 37,8 MWh •Temperatures 40-60oC •Covering 100% the heating demand •Summer period •Producing 83MWh •Temperatures > 80oC •Covering 100% the heat input for the absorption •Covering 100% the sanitary hot water needs. thermal storage tanks (international patent) Seasonal storage

Key elements: Special insulation = very low thermal losses (<0.6 W/m2K) Special membranes = water proof, endurance to high temperature cycles (7 to 90oC) Concrete additives = prevent concrete aging due to temperature cycles

Results : ØSeparation of energy production and energy demand ØSmaller installed power ØAvoiding electricity power peaks Ø45-60 days of autonomy Solar Cooling Absorption Chiller ØExisting technology ØIndirect fired ØRelatively easy to install

Technical information: Completely powered by solar thermal collectors Connected to the aquifer (no )

Specifications: Heating power input = 54 KWth Cooling power output= 35 KW Average COP = 0.65~0.7 GEOTHERMY Open loop geothermal •Constructed two •Pump from one and re-inject to the other (10~30 m3/h) •Natural water renewal through the water aquifer •Used to exchange heat between the various systems of the building and the earth – aquifer Closed loop geothermal heat exchanger •1000m PE pipes under the foundation of the building •Heat exchange between the building’s systems and the earth – aquifer by circulation of the water in the pipes •Total power approx. 15KW Geothermal Water cooled heat pump Steady conditions Capability for full recovery Proven and reliable operation

Technical Characteristics •Heat power output: 70KW •Cooling power output: 50KW • input: 12 KW

•Average heating or cooling COP = 4,8 • COP > 7 Cooling and heating receivers

Under-floor and in-wall heating systems •PE pipes inside the floor – wall •Specially designed requiring low temperatures for heating (30oC) and high temperatures for cooling (18oC) •Resulting an energy gain of 70% in cooling and 65% in heating Dehumidification- desiccant system •Utilizing solid dehydrates for dehumidifying the air. •Regeneration cycle powered by solar thermal collectors •Significant energy saving Building Management System

Automations Controls all systems and subsystems of the building constantly recording all necessary parameters for further evaluation. Photovoltaics PV collectors •44 panels of amorphous silicon •Nominal power 4,4KWp •Partially covering the building needs(10-15%) •System to be connected with the city grid selling the electricity at 0,45€ per KWh FEASIBILITY STUDY

Savings: ü 92,5 MWh electric energy / year ü131 MWh thermal energy / year ü43.800 kg diesel / year üReduction of 138.000 kg CO2 / year

Society benefits: üPollution reduction üSaving the natural resources

üEquivalent to 6900€ / year (ExternE) Research and Development High efficiency concentrating tracking thermal collector •Temperature production up to 200oC •Solar cooling •Steam generation

High efficiency concentrating tracking combined electric - thermal collector •Temperature production up to 400oC (primary circuit) •Solar cooling • Steam generation • Electric power generation CASE STUDY OF COMPLETE ENERGY SAVING SYSTEM

CANDIA MARIS HOTEL, Crete, Greece Thalassotherapy Desallination(RO)

Thermal tanks

Hot water production Results Solar system

ØSystem became fully online on 1st

August 2002

ØTill today the solar field has produced 10.692MWh (equivalent of1.485.000 lt diesel) Heat recovery(chillers)

ØAnnual energy savings: Typical conditions of coolers operation Before (without heat After (with heat recovery) recovery) oSolar system185.500€ Cold water temperature 8-13 ?C 8-13 ?C Condenser leaving 40 ?C (spring - 45 ?C 30 ?C temperature autumn) (summer) oCooling system10.900€ (in Cooling power delivered 683 kW 654 kW 757 kW Absorbed power 178 kW 189 kW 153 kW relation to the cooling towers) COP 3,84 3,41 4,94 Social responsibility - economical achievements

ü Annual energy savings above 52,500 MWh. ü Annual oil savings above 7,100.000 lt. ü Annual CO2 reduction is 22.000 tons. ü Annual economic benefit of more than 7,100,000 € ü From 1997 to 2007, Sol Energy Hellas SA activities have saved: ü energy ……………… 290.000.000 KWh ü oil ……………………. 43.000.000 lit ü reduced: ü CO2 emissions ……..123.000 tons ü SO2 emissions ……. 220 tons

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