Recent content by mess

  1. M

    PID or Relay for Circulating Shower

    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...
  2. M

    LiFePO4 battery heater project (makes sure battery doesn't freeze)

    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.
  3. M

    LiFePO4 battery heater project (makes sure battery doesn't freeze)

    and if i leave my camper parked for 2 weeks on its own in my backyard? This is part of what im trying to solve also. But great outside of the box thinking with the water though! It just wont last long enough.
  4. M

    LiFePO4 battery heater project (makes sure battery doesn't freeze)

    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.
  5. M

    LiFePO4 battery heater project (makes sure battery doesn't freeze)

    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...
  6. M

    How can you determine if a fan is better at blowing or sucking?

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

    How can you determine if a fan is better at blowing or sucking?

    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, lets say a long tube. I tested this out with a 7' pipe and i got different results for CFM measurement from...
  8. M

    How can you determine if a fan is better at blowing or sucking?

    I am being vague because its not specific to any one 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.
  9. M

    Applying desiccant to surfaces (aluminum sheet or PLA/PETG)

    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.
  10. M

    How can you determine if a fan is better at blowing or sucking?

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

    Applying desiccant to surfaces (aluminum sheet or PLA/PETG)

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

    Applying desiccant to surfaces (aluminum sheet or PLA/PETG)

    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...
  13. M

    Applying desiccant to surfaces (aluminum sheet or PLA/PETG)

    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
  14. M

    Applying desiccant to surfaces (aluminum sheet or PLA/PETG)

    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...
  15. M

    B How long will it take to reach 1000ppm CO2 from 2000ppm

    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 dont 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...
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