While testing a magma pump setup i noticed that the temperature of water pumped by the liquid pump was fluctuating excessively, during one test it even stopped working because of temperature runaway (water turning in to gas). I am using the setup as shown in the image.
The liquid pump gets 15g/s of 0 C water dropping on the right tile under it. the output is filtered using a power free liquid filter and the magma is just returned to be pumped around again. The amount is chosen as a tile will hold 32g before spilling over to the next tile, allowing 2 drops before this happens. As the liquid pump pumps water and magma one after the other the water blob stays small enough to not spill to the magma (and cause mayhem in the process).
The temperature of the water in the output pipe fluctuates between the temperature of the pump, the temperature of the incoming water and a halfway point. this means that there is some strange thing going on with the temperature calculations.
At the moment the image was taken I the water in the pipe is 0.004C while the pump is 17.4C, moments later the temperature goes to 8.8C before going back to 17.4C.
Also the temperature of the pump stabilises around the wrong temperature. I would expect the pump and output water to be around 32C higher in temperatuur than the incoming water, 15g * 4.179 shc * 32C = (aproximatly) 2KDTU. and the pump produces 2KDTU of heat. the temperatuur seems to stabilise around 17C. (the image was taken after I started making runs where the pump started at different temperatures, that is also why the liquid shutoff is there).
Create a liquid pump with a pool of magma underneath the left most side, and an insulated tile under the right side.
Drop 15g/s of water on the insulated tile.
watch the temperature of the liquid output.
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