about the new heatExchangerEffectiveness source
Hi all,
I'm trying to get the new effectivenessHeatExchangerSource work properly, but till now I haven't succeded. I have created a face zone at the heat exchanger inlet, changing the flipMap settings as posted here http://www.cfd-online.com/Forums/ope...map-flags.html, then edited the fvOptions file and added an effTable file in my case folder (see below). faceZones Code:
radiatore_inlet Code:
thermal_radiatore_he Code:
( Code:
Time = 1 Thanks in advance V. |
So far, no one interested in this topic?
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hello,
I am interested in this topic :) About your error, this may due by the "\\" in your effTable. By the way, what is the value in your effTable ? The structure is: Code:
((A((x y) (x y) ...)) B(((x y) (x y) ...)) ... ) regards, olivier |
Quote:
and thanks for joining the discussion. No, unforunately the "\\" are not responsible for the error (in the OpenFOAM file syntax, what comes after the "\\" is just interpreted as comment, like on the C++ language). About your question, imagine a radiator crossed by air and a liquid coolant (just an example, it could be also gas-gas). If you assume the air as primary flow and the coolant as secondary flow, following your syntax you'll have that: -A, B,.... are values of the primary mass flow; -x,... are values of the secondary mass flow; -y,... are heat exchanger effectiveness values corresponding to the primary and secondary mass flows combination. So, basically, it is a two-dimensional table where both mass flows vary and the effectiveness changes accordingly. The effectiveness as a parameter is defined as the Qeff/Qmax ratio, where Qeff is the effective thermal power echanged for a given set of inlet mass flows, inlet temperatures and specific heats, and Qmax is the maximum theoretical exchangeable power for the same inlet conditions (Qmax=(mass flow*specific heat)_min * DeltaT_inlet). Usually this kind of data comes from experimental measurements on the heat exchanger in question. The table syntax which I posted above is quite similar to the one proposed in the heatExchangerEffectiveness original source files, that is: Code:
secondary MFR Regards V. |
Thanks for documenting your findings, I am currently interested in creating an fvOption that is similar to this.
Did you figure out the problem? Did you run the case with the debug version of OpenFOAM, where you can see exactly where the error is occurring? |
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