Multilateral Projekt Plus – Energy House Secondary Forestry School, Prešov Slovakia

Plus – Energy House

12 steps to our energy plus house1. Structural conditions2. Conceptual conditions3. Increased thermal insulation envelope4. Prevention of thermal bridges5. Passive use of solar energy and thermal storage6. Active use of solar energy7. Optimally chosen heating system8. Energy efficient preparing of hot water9. Ventilation device with heat recovery10. Efficient use of electricity11. Conscious behavior of users12. Positive ecological balance of the house

1. Structural conditions Placement of buildings on the southern exposure is especially

important direction of slope on sunny side. Weather conditions in the area affect the consumption heating

energy buildings. Directing the appropriate property in wind direction, improving the aerodynamics of the building (compact form), limiting the height of a suitable layout of the surrounding vegetation.Rivers and lakes moderates temperature fluctuations, and therefore have an important function of climate.

Wooded areas have a significant regulatory role for the local climate, air purification, retain moisture and regulate the humidity and ambient temperature, protected from the wind, create leisure and recreational areas. Planting trees and shrubs can be protected upper house from the effects of wind, cold and noise, and additionally improves air quality.

Climate Conditions in PrešovLatitude :48°59′47.22″ NLongitude :21°14′19.39″ E Altitude : 296 m. n. mSolar radiation : 1225 - 1275 kWh/m2 yearAvarage temperature : 8 – 11 ° CPrevailing wind direction :

The annual average prevailing direction: north – 22, northwest - 20Next: South - 19, North East - 13, South East - 11, southwest - 6 West - 2 East - 2, with no wind - 5

2. Conceptual conditions In shape designing of the house we assume the condition,

that will be the required volume at the lowest surface structure (the optimal shape is a sphere, respectively hemisphere). Compact, rugged little building with a few breaks, projections or balconies has a smaller loss of heat transfer.

3. Increased thermal insulation envelope Windows - the majority of households lost more than 25% of heat

through windows. Therefore, an energy-efficient house is in the north, east and west windows in the area from 8 to 9% of the floor area. And then increasing window area on the south side of the house about 12% of the floor space.

The roofs of these houses are notably known to need high heat protection therefore should be chosen such a roof in which we achieve the minimum of heat loss. The ideal solution would be a sphere or hemisphere. It is known that this shape is not very practical for common living. The ideal shape of the roof would be less elongated rectangular with the longer side and reversed on the south roof, slightly inclined to the north.

http://www.youtube.com/watch?v=VFjxWdPPY1Q

Heat Loss

4. Prevention of thermal bridges

Thermal bridges arise in the places, where they are connected to each other building materials with different thermal conductivity. The thermal isolation bridges reduce internal temperature. This can lead to other problems : condensation, moisture, mold growth, creating cracks etc. Therefore, the correct design and the proper insulation of thermal bridges has a significant potential benefits:

Prevention of structural problems: surface condensation, aesthetic problems, cracking

Protection against mold

Reducing heat loss - saving energy (heat loss due to conductivity can be reduced by 10%)Improved thermal comfort

Thermal Bridges

5. Passive use of solar energy and thermal storage

The essence of the concept of a solar house is a passive use of solar energy - thus heating of rooms direct sunlight. The energy consumption for heating is about 10 to 20% lower than standard buildings. The main principle is focusing of all the large windows on the south.

Protection against overheating of the building:

The primary objective of the summer thermal protection is prevention against overheating of the internal space. It should be also restricted to use of electrical and ventilation equipment to apply less demanding, but it must be effective enough to measure such as mechanical shielding, adequate ventilation, favor massive mass of buildings and water areas.

Solar Energy

6. Active use of solar energy Active solar heating system uses solar energy and transforms it

into heat energy. Solar systems are mostly used for heating water, heating swimming pools, greenhouses, etc. It can be used to support heating.

7. Optimally chosen heating system Terms of the heating system can be summarized into three

basic groups:

- Building requirements - architectural and urban concepts of construction, its layout, thermal properties of building structures and outdoor climatic conditions. These requirements relate to the shape, location and properties of building materials.

- Requirements for heating system - the fuel base available, the use of space heating, thermal comfort requirements.

- Operational requirements – requirements for operation, maintenance and comfort, esthetic and more.

When you have whatever heating system, make sure that it is designed and tailored exactly to your house. Just so there is a presumption of economical and safe operation.

Heating System

8. Energy efficient preparing of hot water Use equipment economically and environmentally appropriate,

such as heat pumps are powered by natural refrigerants such as ammonia (NH3)

In particular, energy-saving applications are mainly linked to     heat recovery from industrial processes. Produced waste heat can be profitably reused in buildings - potential that is barely used for a long time

9. Ventilation device with heat recoveryWhat is a heat recovery? Recovery or heat recovery is a process , where the air is supplied to the building hot exhaust of air preheats. Therefore, warm air does not escape through the open window, but in the recovery exchanger transmitted most of its heat supplied to fresh air.

Main advantages of heat recovery :

- provides the necessary fresh air- provides healthy microclimate without moisture, without the occurrence of mold, without pollen and dust-free

Principle of Heat Recovery

10. Efficient Use of Electricity

Use energy efficient equipment

LightningUsing of economical bulbs

11. Conscious behavior of usersQualified staff, consideration of the day and season,

proper operation of technical equipment, limiting the heat losses due to ventilation, windows, etc..

Average annual energy consumption in standby mode : TV 9.03 eurRadio 7.46 eurMicrowave oven 4.31 eur Satelite set 47.36 eurPC with all components 57.23 eur

12. Positive ecological balance of the house

Taking into account the balance of the total life cycle, the energy plus houses satisfy all the criteria with a positive impact on the creating of a healthy indoor climate etc..

Thank you for your attention

Have a nice journey to Slovakia