What is the best way to heat water fast, like in an instantaneous hot water heater, or a coffee pot? Is it possible to run the water inside of copper tubing that has been heated like the heating element in a dishwasher or oven?
IRstuff is exactly correct. We don't know a lot of things about what you ask. For example, are you dealing with static water or steady-state water flow? I can answer the basic question with the basic truth:
The fastest way to heat water is to sparge live steam directly into it.
However, this may not be acceptable to you. Everything has a trade off and sparging has its own tradeoffs as well. For all I know you may just be trying to warm up a cup of coffee. Nevertheless, I believe my statement to be true.
Ok, I will try to restate the question. Is it possible to heat water that has a constant flow rate through a metal tube that is an electrical heating element?
I am trying to heat water in a coffee pot, with electricity, however we want to have as low a temperature as possible at the heating element and still get the water to 180F or so. We thought that running the cold water through the inside of a hollow heating element would work well. Do you think this will work?
In direct contact with an electrically live surface? I don't understand, then why can you touch an oven heating element without getting shocked? Never mind the scorching burn.
Kevin.
I don't see how the metal tube would be the heating element? From my point of view, the tube would be a water pipe, such as copper, which is covered by the resistive electrical heating element (electrically insulated from each other) which is then covered with insulation.
Never mind the mumbo-jumbo about what you think is the solution. Newton's law requires that you can a temperature delta to cause heating. You have a finite amount of heat energy that must be transferred in a given time. The lower the heater temperature, the longer the contact with the heater must be.
You seem to be thinking that you have some sort of killer product, yet you've done nothing or know very little about the problem that you seem to claim to have a solution for.
Watco is asking about the best way to heat water fast, specifically, heat approx 1.5 Liters to 90 deg C in approx 3 minutes with starting temp around 7 deg C worst case. Ideally heat it without a tank. Heat incoming water from inlet valve as needed until 1.5 Liters of heated water is reached.