[esp-r] Re: Intergrated bld/mfs/plant simulation

[Nicolas Kelly]

Iain,

A couple of things to try:

1)      Make sure the building and plant are running at the same time step if not re-run and check if the problem persists.


2)      Try running the model with no flow network, using the basic plant flow handling. If the ventilation loss disappears then it indicates a substantial bug the plant/building/flow coupling, where a phantom loss of massflow * dT is introduced [dT is the internal-external temperature difference].]


Let me know how you get on an I'll have a look at the appropriate section of code.

Nick
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Nick Kelly BEng (Hons) PgC MSc PhD FHEA
Energy Systems Research Unit
Mechanical Engineering
University of Strathclyde
e: nick at esru.strath.ac.uk
t: +44(0)141 548 2854
f: +44(0)141 552 5105
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From: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of Macdonald, Iain
Sent: 09 May 2011 21:29
To: 'esp-r at lists.strath.ac.uk'
Subject: [esp-r] Intergrated bld/mfs/plant simulation

I have a 'simple' integrated problem with a single thermal zone, a plant description of an AHU and a flow network controlling the AHU fans and % of outdoor air. Strangely the thermal zone shows a ventilation loss of about 2 kW while the AHU fan is on and heating. Can anyone explain this?

Some details:

1)      The heating coil does heat the supply air to its set point (checked in the plant results)

2)      The zone air temperature (from building results) is less than the supply air temperature (from plant results)

3)      The building results show both a sensible heating load and a ventilation loss

4)      Flow results show the fans coming on and off at the correct time and balanced flow into/out of the thermal zone's node

Any suggestions welcome...

Thanks,

Iain

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