On Mon, Jul 18, 2011 at 11:20 AM, P.J van Noorden <pjvannoor...@caiway.nl>wrote:
> > > To conventionally explain the boilingpoint of 100.5 degrC the backpressure > in the Ecat must have been 30mbar (for a boilingpoint of 99.6degC) and > 20mbar for a boilingpoint of 99.9degC. This compares to resp 30.6 cm and > 20.4cm water and this is about the hight of the chimney. The difference in > temperature of the steam can ofcourse only be explained if the chimney of > the ecat is almost completely filled with water. This is ofcourse the big > question. > But if it is steam, then it has a much larger volume, and moves much faster and then fittings, expanders, reducers, elbows all produce significant losses, and cause pressure increase. The K-factor for various fittings is tabulated, and the pressure in steam-flow is very sensitive to this factor. There's quite a useful calculator at http://www.pipeflowcalculations.com/pressuredrop/. It takes a little while to get all the data, but for steam flow, pressure is most sensitive to K, and using reasonable estimates based on visible plumbing, it is quite easy to get a pressure increase of 50 or even 100 mbar.
