Comments by "ke6gwf - Ben Blackburn" (@ke6gwf) on "Why do hurricane lanterns look like that?" video.

  1. I think you are looking at the claim of the cold blast lantern pulling more air in backwards. It has a much taller chimney, thus increasing the negative pressure behind the flame due to the draw of the chimney, and this gets more air into the intake tubes. The hot blast variant had a chimney that ended barely above the globe, and was occluded by the intake to boot, so the new design has a taller and more free flowing chimney, thus inducing greater intake air flow.
    1
  2. You need to do a video on cold air intakes on engines and why it helps, because you clearly don't understand the principles lol. It is to get more air into the cylinder by reducing volume. A cold air intake, or an intercooler on a turbo charged engine, is there to increase the density of the air, thus making it possible to fit more air into the cylinder, because the engine works by heating the air up and making it expand. So if you put hot air in, it's already partly expanded and so you get less power. Think about how a turbo is trying to squeeze more air in by increasing the pressure, doesn't it make sense to decrease the temperature as well? This is also one of the reasons water injection is used in some performance engines, because it cools and densifies the charge air. Nitrous injection also does this. So on an ICE, cooling the intake air is entirely to increase density, and the amount of air that will fit in the cylinder, thus having more air that can expand a greater amount when it's heated. Remember that an ICE is still a heat differential engine and so the greater the heat differential, the greater the potential power. For clean combustion however, preheating the air is very helpful and important, because if you preheat the combustion air, it allows the flame temperature to be higher, leading to a more efficient combustion. Industrial oil burners often preheat the air with exhaust heat for this purpose. Google "preheating air for combustion" etc. So if your end result needed is expansion (ICE, turbine engines, rockets, etc), then you want to have your intake air as cold and dense as possible, (see SpaceX superchilling their propellant), but if you are just going for heat production, preheating is important. I will also mention carb heat on planes and the old engines that had heat stoves or the intake manifold heated by the exhaust manifold. That is very in-ideal, but to solve a problem with gasoline not evaporating properly, either due to the use of carberators that didn't evaporate the fuel well, or due to the cold temperatures in high altitude air. But generally the cars with those features were not high performance cars, or they had thermostatic dampers on the heat stove, so it only helped while the engine was cold and then shut off the heat.
    1