[esp-r] Re: Pressure calculation affected by .mfs - .pln mapping

[Geissler Achim]

Hi Dimitrios

sounds like an interesting model you have. Basically, the mass flow network is a set of equations that must satisfy the mass conservation law. The pressures and mass flows are interdependent and result from taking available flow paths, fixed pressures given at nodes and flow resistances and/or fixed flows (e.g. fans) between flow nodes into account.

So, I would expect changes in pressures if you superpose mass flows on a given network.

Best
Achim


Von: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] Im Auftrag von Dimitrios Sfakianakis
Gesendet: Montag, 12. Dezember 2011 11:13
An: 'esp-r at lists.strath.ac.uk'
Betreff: [esp-r] Pressure calculation affected by .mfs - .pln mapping

Dear list,

I have set up a flow network and a plant network and have mapped two connections of the plant network to the flow network. From what I read in the documentation (Hensen, 1991), by mapping the two networks, the mass flow rate calculated in the .mfs is transferred to the mapped connection in .pln. However I noticed that the pressure of an internal unknown node (linked to a zone in my model) calculated by the .mfs, is affected by this mapping. If the only effect of this mapping is the mass flow rate transfer from .mfr -> .pln how can the pressure calculations in .mfr change? What am I missing?

Kind regards,

-

Dimitrios Sfakianakis

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