I need some help finding the best way to make a lightweight heater. Lots more info in details! Answered
So for one of my classes we work with a random company to solve some sort of problem that they have. It’s an engineering class so the problems are all solved with physical things that we have to design; I just thought I should be clear that we weren’t solving financial problems or anything like that. Anyways, my project has to do with keeping water in a tray (48mm x 60mm) at a certain temperature for a period of a couple of hours. The water needs to be held constant at any temperature between 20 and 40 degrees Celsius. My first thought was to use NiChrome wire to heat it but I don’t know how well that would work at lower temperatures so then I thought to use etched pcb as a heater but I’m not sure if I could get enough resistance from so little space. The other restriction I’m facing is that you must be able to see clear through the center of the tray and whatever I’m using to heat it (lets just say a hole 1cm x 2cm must be left in the center) which reduces the resistance I could get from pcb even further given there is less area to run traces. The heating apparatus must be as light as possible and I feel like electronic heating is my best bet since it is the easiest to control. If you have any suggestions or think that my ideas are dumb or anything just let me know. I’m happy to get any input here. THANKS!