When designing a Suntherm infrared heating system, the heat loss must be calculated for each room, based on which the capacity to be installed and the panel type can be determined.
When calculating the heat loss, the heat loss of the walls of the building
/value K/ is very important, which is indicated in the building construction plan or can be calculated from the layers of the wall structures.
The unit of the heat loss is W/m2K. It describes how much energy 1 m2 of wall surface loses taking a difference of 1°C into account.
When calculating the heat loss value, the value of “U” must be calculated, this is the product of the wall surface, the value “K” and the intended temperature difference.
- Heat loss: 0.2 W/m2K
- Wall surface: 100 m2
- External temperature: - 5°C
- Internal temperature: + 20°C
„U” = 0.2 x 100 x 25 = 500 W
Taking 24 hours of running time into consideration, the value of the capacity to be installed is 0.5 KW.
When designing the heating system, reserve heat must be taken into account, therefore 8 to 12 hours of running time should be considered in general.
The amount of the installed capacity must be increased in proportion to the decrease in the running time.
In the case of 10 hours of running time, the amount of the installed capacity must be multiplied by 2.4.
In the case above, the value of the capacity to be installed is 500 W x 2.4 = 1200 W.
1.2 KW of installed capacity x 10 h of running time = 12 KW/h of daily consumption.
In the case of a simple design, the following calculation must be performed:
In the case of a building with a heat loss of 0.6 W/m2K and an external temperature of 0/– 5/°C and with an intended internal temperature of +20 –/+22°C/, the following capacities should be installed per cubic meter of air for 8-10 hours of running hours.
Independent heating system
In rooms with external walls which are generally used: 35 W/m3
In rooms with heated internal walls which are generally used: 30 W/m3
In bathrooms with external walls: 45 W/m3
In bathrooms with internal walls: 40 W/m3
Bedrooms and kitchens with external walls: 30 W/m3
Bedrooms and kitchens with internal walls: 25 W/m3
Aisles, staircases: 20 W/m3
Auxiliary heating is used during transition periods (in autumn and spring/.
In winter, it can supplement other heating systems.
In rooms with external walls which, are generally used: 20 W/m3
In rooms with heated internal walls which are generally used: 15 W/m3
In bathrooms with external walls: 30 W/m3
In bathrooms with internal walls: 25 W/m3
Bedrooms and kitchens with external walls: 15 W/m3
Bedrooms and kitchens with internal walls: 10 W/m3
Aisles, staircases: 0 W/m3
How to choose the appropriate heating panels
Clear height of the rooms is a very important consideration.
Only panels with small capacity can be installed for rooms with clear height below 2.5 m.
220 W, 250 W, 300 W 350 W
In rooms with a clear height of 2.5 to 3 m both high-capacity and low-capacity panels can be used.
350 W, 500 W, 650 W
In rooms with clear height above 3 m, up to maximum 4.5 m, high-capacity heating panels of 650 W, 1000 W should be installed. No small-capacity panels are used in such rooms.
High-capacity infrared panels can also be used in rooms with clear height below 2.5 m, but only in bedrooms /because on beds heads are in a low position/ and in bathrooms /because increased thermal comfort is needed there/.