enertec-sm

ESTIMATE OF THE POWER TO BE INSTALLED

NB: the indicated powers are valid for buildings with their whole perimeter dispersant, including floor and ceiling. The indicated powers must then be diminished according to the parts of a house or building attached to other heated buildings.
The indicated powers are exact for plants working continuously for the whole winter season.

• Calculating the total area of a room that can be trampled on, e.g. 100 sq.metres
• Choosing the nearest geographical area, e.g. Cuneo
• Establishing the average project temperature: -10° C (see table)
• Establishing the type of building and the corresponding value in watts (see table)
• Multiplying the watts by the trampling square metres
• Dividing the total watts by a number of RADIEL which will then be divided by the number of rooms, keeping in mind the use of the room - living room, bedroom, studio - and its orientation - north, south, etc.
• Possibly increasing 30% this power to have it available in case of need (intermittent use, temperature higher than 20° in certain rooms, etc.)

E.g.: a building of 100 sq.metres in the town of Cuneo with good thermal insulation.
Minimun outside temperature as per project for the town of Cuneo = -10°C
Type of building A which with -10 C° needs 44 w/sq.metres
24 x 100 = 2400 w rounded off to 2500 w
2500 / 500 = 5 number of needed Radiel

2500 / 500 = 5 n° di Radiel necessari

MINIMUM OUTSIDE TEMPERATURE AS PER PROJECT

The project minimum outside temperature is a value used in planning heating systems and in insulating buildings.

It is defined as the minimum value of the average temperatures of the coldest 10-year periods reported in a given place. It varies depending on the city or town where the building is situated; more precisely, the lower is the value, the more is the heat flux towards the outside and therefore the more is the quantity of heat the heating system must supply.

In case of an area, town or city not indicated in the above list, it is advisable to consider as outside temperature the one indicated for the closest place in the list, modifying it as follows:
> To take in consideration the different altitude:

• Unchanged temperature up to about 200m of elevation difference
• Decrease or increase of 1 °C for each further 200 m of higher or lower elevation

> to take in consideration the different situation of the outside environment:

• Unchanged temperature, except for different altitude, in an urban area
• 0,5-1 °C decrease in small built-up areas
• 1-2 °C decrease in isolated buildings

Example:
isolated building at 1450m above sea level, in the province of L'Aquila (750m of altitude)

• Project outside temperature for the town of L'Aquila (750 m) = -5° C
• Decrease for altitude difference (700 m) = -2,5° C
• Decrease for isolated building = -2° C

Project outside temperature total = -9,5° C
The temperature difference in this case will be (Inside temp. - outside temp.): 18° C + 9,5 = 27,5° C

Buildings with reference to thermal coefficient
A: buildings with good thermal insulation, with full anti-loss protection, with double window panes
B: historical buildings with walls in full bricks > 40cm thick/ 30cm open tiles, with double window panes
C: buildings with walls in stone or in full bricks < 30cm thick with simple window panes; buildings much exposed to the weather elements or with wide glass surfaces