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desertfox, I also want to use your other method Q=-k*A*dT/dx The problem is for 2 concentric aluminum cylinders. Larger has radius of 3 inches, smaller one has radius of 1.6 inches. Both are 6 inches tall. The water is in the area between the 2 cylinders, touching both cylinders. Heat is...

desert fox, Thanks for the answer. That is what I was looking for. Can you take a look at the following. It is using the first method your recommended. Q = m*Cp*TempChange Assuming: Temp Change = 85.8 C = 359 K Water Volume = 2 Liters m = p*V where p = density of water (1kg/L) =1kg/L *...

I need to calculate how long it will take to heat water with two concentric heated pipes. Specifically, one pipe 6" in diameter, 6" tall and a second cylinder 5" diameter and 6" tall, so there is a 1" gap between them full of water. Question: If we heat the outside of the larger cylinder to a...

I agree, the car thermostat is the best option. Cheap, reliable, effective.

Does anyone know of a supplier of an inline valve that opens when exposed to hot water (approx 185 deg F) and closes when cold? It would function similarly to a car radiator thermostat, but ideally would be a smaller diameter (approx 1" or less) and be cheap ($20 or less). Considering using a...

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.