This is not very efficient, especially if they are mounted in the corner of the room.
For this reason, there are convector radiators that include a fan in order to improve the heat distribution and circulate higher volumes of air through the radiator blades.
In this alternative approach, standard radiators are upgraded to convector radiators using commercial off-the-shelf components (COTS) for 35€.
Step 1: Assembling the fans
This type of fan is very silent and about the same width as the hot-water radiator. By joining 4 fans together, they cover almost the entire radiator length.
- 7 Plastic Blades
- Speed: 1600 RPM
- Airflow: 58 CFM
- Noise: 38 DBA
- Rating: DC 24V, 0.20A
These 4 fans were bought online for a total of 13.20€, plus 10.10€ for shipping.
The structural strength is given by the cable ties that pass through the holes in the corner of each fan, and join the fans together.
Step 2: Connecting the cables
These hold quite well the tip of a coper cable.
It is also possible to merge 2 connectors with a small piece of cable, by plugging one to the back of another.
This minimises the number of cables reaching the power supply.
The power supply connected with a basic 2 wires AC cable on one side, and the DC cables from the fans on the other side.
Not shown in the pictures is a 1.5€ pass-through on/off switch and a basic AC plug (1.5€) at the end of the AC cable.
The power supply is a 24V Universal Regulated Switching 25W Power Supply.
Since the fans are 0.2A each and the power supply is rated at 1.0A, there is a margin in terms of the maximum current allowed.