Jeff Driscoll <hcarb...@gmail.com> wrote: Can someone tell me where the exit water themocouple was located? It > meausured a delta T of zero C to approx 9 C during the test. >
This is shown in the video. I believe it was on the outside of the pipe leading out from the heat exchanger, and it was wrapped in insulation. I do not think it was in a probe, inserted directly into the stream of water. (The report should have specified this -- will ask Lewan.) If it was on the outside, I think this is an excellent place to put it, as long as it is wrapped in insulation. The pipe itself averages out the temperature nicely. Many researchers such as Miles and Takahashi use probes on the outside of metal shells, and calibrations show that it works well. That fellow GoatGuy wondered if the water in the pipe is well mixed. I guarantee it is. Water flowing through a heat exchanger at 10 L per minute will be well mixed. One of the purposes of a heat exchanger is to mix the water so it is all heated (or cooled). The inside is convoluted. > Could it have been under the influence of an electic heater nearby? > There is no electric heater nearby. It could be influenced by the outlet from the condensed steam water, but I doubt it for the following reasons: It was far from that spot; that temperature is probably close to the cooling water, since this a commercial heat exchanger. The was much more cooling water going through than condensed steam, so the thermal mass is much greater. Overall, the heat exchanger temperature itself must be close to that of the flowing cooling water. That's what a heat exchanger is for! - Jed
