Your simulation looks interesting and might generate good correlation when it is honed in. I would expect the heat exchanger manifold body to settle at a temperature somewhere between the ECAT exit temperature and the output water temperature of the exchanger. The relative flow rates must weigh into the equation as you seem to be suggesting. Do you think that the vapor condensation active area might be a big piece of the puzzle? One more issue that I think will be important is that the pressure within the heat exchanger must be near atmospheric. This should cause a modest amount of the liquid leaving the ECAT under pressure to flash into a large volume of vapor. Have you been able to make an estimate of the relative volume of vapor versus liquid entering the manifold?
Keep up the great work. -----Original Message----- From: Alan J Fletcher <a...@well.com> To: vortex-l <vortex-l@eskimo.com>; vortex-l <vortex-l@eskimo.com> Sent: Wed, Oct 26, 2011 7:06 pm Subject: Re: [Vo]:Manifold mispositioning makes measurements meaningless At 03:55 PM 10/26/2011, David Roberson wrote: Maybe you have an error with your simulation since the number does not seem to match the real world results. What kind of flow did you assume in the primary? I think that vapor condensation is where the most action is since that takes so much more energy than cooling the hot condensed liquid. I wish someone would have been wise enough to place the thermocouple well. My initial simulation assumes primary 100C water IN at 15 L / hour, and the secondary 30C water leaving the heat exchanger at 600 L / hour. The "height" of my manifold model is approximately right, but it's probably 1/2 the correct length. I plan to calibrate the water/water simulation and then consider steam/water. The manifold is so short that I don't think there would be significant condensation in it -- so the heat transfer will be the same for superheated or saturated (100% dry) steam.
