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Originally Posted by Les
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A little surprised at the apparent convergence as flow rate is decreased..
Although the influence viscosity on h(conv) may be less at low values( eg, think have better illustrations somewhere among st my Excels)
would expect the effect of Heat Capacity to become apparent with departure from Isothermal(see 55 ). Will try some numbers. |
Am also a little put out by it. Could simply be the noise at these (very) low flowrates.
I did a check of my flow rate calculation last night. Expected to see the effects of the reduced Cp but did not. Max error in averaged flow rate calculation from Watts and Tin-Tout versus bucket test was ~0.05 lpm @~3.5lpm. Note that I did not confirm the water only numbers before adding glycol. Wish I had, do not want to do it again but I think I need to. It's a finicky three handed process of starting logging, stopwatch and transfering hoses without flooding the proceedings.