Recent content by mess

I am considering using PID (autopid arduino lib), in order to control the heat, with PWM and a 50amp mosfet heating a 40amp 24v heating element in a 3litter tank, but I am thinking, that since the water is going to be circulating, and sometimes losing heat to a person, sometimes falling straight...

I have a 700watt array now. I get about 8 hours of sun a day(this time of year), often overcast The BMS on the battery will not let the charge start if the battery is under 0. So a heater is required.

and if i leave my camper parked for 2 weeks on its own in my backyard? This is part of what I am trying to solve also. But great outside of the box thinking with the water though! It just won't last long enough.

While freezing is a concern, charging below zero is a totally different concern. In this battery chemistry it creates dendrites and overtime these can severely reduce the capacity of the battery.

I think PID is overkill (but would consider it). I am thinking of setting up an array of thermistors around the battery to make sure that they are all above T? Maybe two on top, two on the sides. The battery is about 8"x20". I am building an r10 insulation box around the battery, which will...

wow checking back on this thread months after posting it. I really like where it went :D

I see so the main consideration is just contamination effecting performance, and that all fans perform equally well sucking/blowing if their position is reversed in the same system, let's say a long tube. I tested this out with a 7' pipe and i got different results for CFM measurement from...

I am being vague because its not specific to anyone system, I am working on many, and so just looking for a general rule on determining if a fan is better for pulling or pushing air.

Thanks for your suggestion. Also a descant wheel is not an ERV wheel (which is why I specified I need to apply it to aluminum or a plastic capable of heat transfer). They do different things and are manufactured differently.

I am trying to determine if they are better placed in positions where they suck or blow. Is there a rule to determining this?

Thank you but I am not seeing any relevant (how its made) info on either of those links. I hope i didnt miss anything.

I think i just thought of a great way to do this. I will try to get silica powder, and then surround my 3d printed part in the powder, and then I bake it, this way it will maintain its shape and a thin film of silica will stick to the printed part. people are already doing this with salt in...

and would i just use pure silica powder? I would have to toss it around in a bag of it or something because the channels in the wheel will probably be around 1-2 inches deep and extremely narrow. It would be much better if i could make a solution of it that i dip the part into

I will either be using aluminum strips wound up, or 3d printing it out of PLA or PETG. How can I apply a coating of silica to the surface of either of these materials so that it can hold and release the moisture of the incoming air/outgoing air? This is to manage heat and humidity in my...

Thanks for the response! What is dt? is it delta time? and what is p(t)? A human adds 5000ppm CO2 in one hour. So me being alone will add that to the room I don't know, there is no constant rate to this because the fresh air is being mixed in with the inside air, and that mixture is being...