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Smart energy in Europe. Heat losses and gains Termografhy of a building.

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Presentation on theme: "Smart energy in Europe. Heat losses and gains Termografhy of a building."— Presentation transcript:

1 smart energy in Europe

2 Heat losses and gains

3 Termografhy of a building


5 insulation Natural : wood fiber, cork Mineral: expanded clay, foamed glass Synthetic : expanded polystirene, polyuretane Remember! 10 cm of good insulation correspond to 40 cm of wood, 60 cm of brick, 710 cm of concrete!

6 A lot of attention to windows! The eaves on the window allows in winter time to get gains from solar rays and in summer time to get shadow agaist sunshine

7 Bioclimatic architecture

8 INDIRECT SOLAR GAINS Air between window and wall is heated by sun and through air pump is sent inside while cold air is picked in the lowest part. In summer time air pump provides to an efficient circulation for refreshing Traditional building requires 169 kWh/m2 /year, a bioclimatic building requires 56 kWh/m2/year

9 Indication for better use of buildings. What can you do? 1) Is advisable to reduce the dispersion of heat with the use of double glazing in windows and the insulation of the walls. The energy consumption, in fact, can be reduced by up to 50%. 2) Remember that dark surfaces absorb more solar radiation. 3)Do not use curtains or blinds to shield the windows and glass surfaces on winter days, because the windows provide natural light and allow the heat of the sun to enter (heat storage). 4) Keep doors and windows closed when heating and cooling 5) Add shielding inside buildings (eg Venetian) 6) use plants for shading, et cetera. 7) Do proper use of windows (for the penetration of the sun during the winter, shading and night ventilation in summer)

10 THERMICAL COMFORT LOCAL AIR STREAM IN WINTER HEATING COMING FROM LOCAL RADIATION NOT OMOGENOEUS VERTICAL TEMPERATURE FLOOR TEMPERATUTE TOO HOT Thermical comfort: balance is maintained between humans and the environment and the heat produced by human body is removed by the body itself. Temperature should be omogeneous around 18-22°C and humidity: 30-60%

11 thermal energy sources Petrol products Heating pump electricity pellets wood Solar systems

12 Thermal energy distribution Radiating source Wall heating Radiant strips

13 conditioning EER A 3.20 < EER B 3.20 ≥ EER > 3.00 C 3.00 ≥ EER > 2.80 D 2.80 ≥ EER > 2.60 E 2.60 ≥ EER > 2.40 F 2.40 ≥ EER > 2.20 G 2.20 ≥ EER

14 Suggestions … Avoid using air conditioning when possible A fan can provide the same level of comfort Avoid unnecessary heat fluxes Curtains are excellent tools to prevent heat entrance in summer Choose a level of comfort between 22-25°C (every degree below means 8% more energy) Keep doors ans windows closed Provide good insulation If air conditioning has movable louvers, turn them to the ceiling (cold air goes down) Look carefully the class energy The condenser has to be located outside in a well ventilated area

15 Now practice …. Calculate energy class of your home! 1)Check your fuel consumption during winter time 2)Transforme your fule consumption in kWh 3)How many m 2 is the surface of your house? 4)Compare your consumption and check energy class of your home

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