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Location

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Building

Area m²
Height m

Heating and Cooling Parameters

Door application & type

Industrial

Overhead Sectional

Door size

Clear Height m
Clear Width m
Glass Area %

Cycle time: seg

Number of cycles per year

U-Value: W/m²K

Air permeability: m³/m²h

Solar factor

Electrical consumption

Door leaves Weight kg
Opening Power W
Stand-by Power W
EDSF
T1 T2 T3

Case 1

 

Case 2

 

Case 3

 

Important

These results of energy losses through the doors are illustrative and they are shown only for comparison purposes. The calculation is based on EDSF research and standards and carried out on buildings with a parallelepiped shape without interior divisions. The overall losses in buildings in real environments are influenced by a lot of factors that must be taken into consideration for an accurate calculation. For more information, please go to www.edsfdoorenergy.com.

Location

It is the location of the reference building to get climate data.

Climate Parameters

Outside temperature in heating season

°C

Outside temperature in cooling season

°C

Heating days per year

days

Cooling days per year

days

Average wind velocity in heating season

m/s

Average wind velocity in cooling season

m/s

Correction factor percentage according to wind direction

%

Solar Irradiance in heating season

kWh/m²

Solar Irradiance in cooling season

kWh/m²

Peak solar hours per day in heating season

hours

Peak solar hours per day in cooling season

hours

These are average climate relevant values for the specified location. It can be also changed by the user.

Given correction factor of wind direction is a mean value of all directions without predominant ones. It can be calculated as in CEN/TR 16676.

Building

The reference building for calculation has a parallelepiped shape without interior divisions, and its size is defined by its area and its height.

Heating and Cooling Parameters

Cooling

Heating power

W/m³

Cooling power

W/m³

Inside setpoint temperature heating season

°C

Inside setpoint temperature cooling season

°C

Working days per week

days

Workday time

hours

Door surface emissivity

These parameters define the performance of heating and cooling systems of the building throughout the year.

The emissivity of the door surface determines long wave radiation, which is the thermal radiation spontaneously emitted by objects like doors in the form of infrared light and it is also taken into consideration in calculation model.

Door application & type

Door application refers to the use of the door: industrial doors, pedestrian doors and residential garage door are considered. Different technology, regulations and energy characteristics concern to the automatic doors depending on this use.

Several door types have been defined depending on the application and door market. In the case of a door type not explicitly defined, select the closest type on the basis of the type of opening (vertical or horizontal).

Select a Door Type

Door size

Door clear width and door clear height determine door size and air flow area.

Glass area indicates the percentage of transparent glass material of total door area to calculate solar radiation.

Cycle time

Opening time

s

Hold time

s

Closing time

s

It refers to the total cycle time in which the door is moving to open (opening time), staying open (hold time) and moving to close (closing time).

When the door is opened, there is an exchange of air mass of a far greater order than arises due to permeability. The total amount of energy loss will be determined by how long the door is open and, during that time, the thermal transmittance and air permeability cease to be relevant.

For a given number of cycles it is the speed of the door which determines the cycle time and therefore total amount of heat loss due to this effect.

Number of cycles per year

It is the number of times that the door opens and closes in one year period and it is determined by the level of traffic flowing through the door.

It defines infiltration losses together with the cycle time.

U-Value

When a door is closed, there is a heat flow that passes through the door. This is defined as the product of its area and the temperature difference between the inside and outside and by what is known as the thermal transmittance of the door or coefficient of heat transmission U.

The thermal transmittance U gives an indication of the level of thermal insulation of the door when closed. The coefficient U of the door as a whole is determined by the standard EN 12428.

Air permeability

There is a heat flow associated with the exchange of air mass between the inside and outside when the door is closed. It depends on the characteristics of the air (specific heat, density), on the temperature difference between the outside and inside, the area of the door and what is known as air permeability L.

The coefficient L gives us an indication of the level of the leak-tightness of the door when it is closed. It depends on the pressure difference between inside and outside which results from the effect of the wind and by the chimney effect in the interior of the building. It is given for a certain reference test pressure according to the standards.

Air permeability is defined and calculated by the standards EN 12426 for industrial and garage doors (reference pressure of 50 bar) and EN 12207 for pedestrian doors (reference pressure of 100 bar).

Solar factor

When the leaves or panels of the doors are made wholly or partly of glass or other transparent materials, solar radiation contributes to the heat inside the building. This is an effect which is generally favourable in winter and unfavourable in summer.

The solar factor is the relative amount of the total solar radiant heat energy entering the building through the glass.

In general, the value of the flow of heat by solar radiation depends also on the geographic latitude and the orientation of the elevation. The model takes these factors into account in average terms.

In real building environments, there are other external factors like the presence of shadows due to neighbouring buildings, the existence of parasols or solar protection elements, etc.

Since access doors are at levels close to ground, the influence of the solar factor is lower than for windows, and in general is of a lower order than other factors, even more so when looking at the effect over the whole year.

Electrical consumption

Automatic door actuation consumes electrical energy, primarily in two situations, when, while activated, it is in a closed position or at rest and when performing the act of opening or closing.

In the first case we are talking about power consumption when on stand-by and in the second about power consumed in operation.

In general, its influence is far lower than other factors related to building.

Weight of door leaves or panels is requested for classification calculation.