smart energy in europe. heat losses and gains termografhy of a building

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smart energy in Europe

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smart energy in Europe

Heat losses and gains

Termografhy of a building

insulationNatural : 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!

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

Bioclimatic architecture

INDIRECT SOLAR GAINSAir 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

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 cooling5) 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)

THERMICAL COMFORT

LOCAL AIR STREAM IN WINTERHEATING COMING FROM LOCAL RADIATION

NOT OMOGENOEUS VERTICAL TEMPERATUREFLOOR 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%

thermal energy sourcesPetrol

productsHeating pump

electricity

pellets

wood

Solar systems

Thermal energy distribution

Radiating source

Wall heating

Radiant strips

conditioning

EERA 3.20 < EERB 3.20 ≥ EER > 3.00C 3.00 ≥ EER > 2.80D 2.80 ≥ EER > 2.60E 2.60 ≥ EER > 2.40F 2.40 ≥ EER > 2.20G 2.20 ≥ EER

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

Now practice ….

Calculate energy class of your home!1)Check your fuel consumption during winter

time2)Transforme your fule consumption in kWh3)How many m2 is the surface of your house?

4)Compare your consumption and check energy class of your home