Oct 17, 2013 · The phase change allows a substantial reduction in the mass of the material required for effective heat storage (the heat of fusion of sodium sulfate decahydrate is 25.53 kJ/mol or 252 kJ/kg [19]), with the further advantage of a consistency of temperature as long as sufficient material in the appropriate phase is available.

May 16, 2011 · What if you heat soil, and let air flow through it later, to harvest the heat? Use separate tubes to avoid bad smells. Or heat the walls of the home. Or heat stones of reasonable size, which you can carry individually in the home. Then, technology brings only the suitable tweezers and the insulated container. You still need to avoid bad smell.

Jan 9, 2024 · However waste heat from many processes can be put to further use. For example waste heat from power stations can heat homes, commercial greenhouses, or swimming pools. And heat pumps can raise the temperature of heat energy from ambient air or the ground to something useful for home heating, although some extra energy has to be put in to do that.

Oct 14, 2024 · The melting point of steel is around 1500°. It is heavier but also more stable. So less material would be needed. In the end one have to calculate it. The heat should remain below 1500° when re-entering. Since heat is dissipated through melting it could be enough, but without the ability to calculate this it remains an estimate.

Jan 11, 2018 · Some dishes like porcelain conduct heat poorly; whereas, metal dishes conduct heat quickly. You want to conduct some heat to the food, but limit the heat going to the environment. For example, put your heater under a porcelain plate because the entire plate will heat up to keep the food warm, but it will slow heat loss better than a steel plate.

Jan 24, 2006 · Piston aircraft engines, before they all became injected, used carb-heat as a way of stopping the fuel vapor from recondensing in the throat and intake manifolds, which lowered fuel efficiency, and to keep it from icing up from condensation. Evey once and a while someone would think that applying this to car motors will save gas.

Aug 25, 2014 · Flint tools struck by iron or magnesium rich stones would've produced sparks. Accidental fires could've been a natural by product of early tool making. It is even conceivable that early applications of line/rope created enough heat from friction to combust; or at least char enough to inspire a quest for combustion.

Apr 9, 2008 · So Im basically looking for a medium. It can be fairly heavy (say....a 1 inch tube 6 feet long weighing a 10-20 pounds or so. But, list metals that are heavier or lighter also) but it definatly needs to be strong and able to withstand beating and heat very well over long periods of time. Also, if possible, the metal would need to cool rapidly.

Mar 24, 2009 · This is because a true thermos has 2 layers, the outer is a shiny, reflective layer to prevent radiant heat loss, the inner is an insulated layer to prevent conductive heat loss. Between the two is the tricky part; there is a vacuum to prevent convective heat loss. Creating a vacuum using household items is not feasible. Tell that to your teacher.

Apr 4, 2020 · Is it possible to make a small unit which fires a focused beam of RF to heat an object from about 1metre away. Doesn't need to heat it much, just a modest difference. If not, is there any other method for achieving this whilst ideally avoiding IR …