Alan,
What would happen if a good metallic connection exists between the device metal case and the temperature sensor? I can imagine that the water and vapor flows past at 100 C while the metal is quite a bit hotter. They would need to use an output temperature of 100 in that case would they not? Dave -----Original Message----- From: Alan Fletcher <[email protected]> To: vortex-l <[email protected]> Sent: Tue, Jul 23, 2013 3:42 pm Subject: Re: [Vo]:DGT Temperature Output Appears to Have a Problem > From: "David Roberson" <[email protected]> > Sent: Tuesday, July 23, 2013 12:22:32 PM > I have been watching the DGT demo with enthusiasm. The technique that > they use to measure the output power gives me pause because of the > elevated output reading that they use to calculate the power. > > > I noticed that the output temperature is in the ballpark of 150 C, > which I have a strong suspicion is not what the output water is > actually exhibiting. This may be a metallic structure reading > instead of water since the internal temperature readings are so > large. I am not capable of interacting with the on line demo so > perhaps someone else might ask them about this issue for me. > > > They should increase the water flow enough to keep the water from > boiling in order to prove that the power is as measured by their > experiment. Otherwise, I would just assume that the water is boiling > and at 100 C provided it is proven dry. > > > Does anyone else share this concern? It's back to steam quality! (Yes, I wish they'd kept the water at 99C by increasing the flow rate). IF there is no water going out of the tube (I posted a request for Mats to check) .. THEN a temp of 143.55 means a COP of 13 See my Steam Calculator at http://tinyurl.com/def-1220 (I guessed ambient and boiling) But they are reporting the COP as if it were water (at high pressure -- 5 bars) -- gives 3.5 vs 13.4 If there is any water in the output flow then it's somewhere between the two.
