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Member #549694

Member Since: April 28, 2014

Country: United States

  • Which metal oxide is that 30%?

  • I know this is an old post, but for you hackers doing an alcohol related project, Drinking Alcohol (ethyl alcohol) actually has a specific heat of 2.46 kJ/(kg * K) , where water (H20) has a specific heat of about 4.18 kJ/(kg * K). What this means is that the higher the alcohol content, the less energy it takes to heat (or cool) said volume of liquid.

    Also, According to Engineeringtoolbox.com The density of ethyl alcohol is 785.1 Kg/m3, where as water’s density is generally defined as ~1000 kg/m3.

    So to find the actual specific heat of the beverage, with known alcohol content, use this formula.

    C = (2.46 * (%Alc)) + (4.18 * (1 - %Alc)) Where C = specific heat of liquid beverage %Alc = Percent of alcohol per volume in beverage (ex: If your beverage is 5% alchohol by volume, you would use the number .05 in your calculation)

    I am not going to poke at the mass change atm.

    I’ll Post again at the end of the semester (End of May 2015) with the rest of the calculations necessary to accurately calculate the cooling with this specific cooler once I finish thermodynamics. Good luck! -JT-

  • I went poking around… Super Capacitors have pretty lousy tolerances generally. I struggled to find a supercap with +- 10% tolerance (they are rare but they are out there.)

  • These would be dangerous to pop though. Because their pop could be a fireball, or shrapnel flying around the room.

  • That is actually a fantastic idea! Probably could hack the case by 3D printing a battery holder that does just that… And have the contacts so the extra weight would not unbalance the iron at all. Especially because the cartridge setup, this would not be too difficult…

  • Will these come in an electrostatic version?

  • These devices generally have a MT-BF (mean time between failure) of about 10000 hrs from what I’ve read.

    As to it falling, if you put it on a flat stationary surface the device shouldn’t fall over. I suggest glue if you have further gravitational concerns.

  • Silicone. Like the caulk used to keep moisture out.

    Cant ever remember there is a difference.. Gets me every time… sorry about the ambiguity folks.

  • Is this why when I use a basic circuit (connected, on and off doesnt matter) My finger can cause it to switch on and off unintentionally??

  • From cross product investigation, generally the side seals are made from silicon.

No public wish lists :(