[BLDG-SIM] Zone mean radiant temperature in eQuest

[Graham & Megan]

Has Ecotect advanced its thermal engine? Or ar the MRT's you mention
generated by Energy+?  When I looked at Ecotect some 2-3 years ago, I
believe it was using a simplified CIBSE method to calculate heat flows.  If
this is still the case the results may be poorer than what you could extract
from DOE-2.2 (if you could extract), which as previously noted would need to
be interpreted with a grain of salt.
Graham

----- Original Message ----- 
From: "Gerald Pde" <geraldpde at yahoo.com>
To: <BLDG-SIM at GARD.COM>
Sent: Sunday, October 29, 2006 7:05 AM
Subject: [BLDG-SIM] Zone mean radiant temperature in eQuest


> Ecotech is another very good tool to get mean radiant
> temperatures in a space. You could report out zone
> temperatures for an hour from an hourly report in
> eQUEST and using those values into ecotech.
> Hope this helps too.
>
> Gerald
>
> --- "Jon Hand (clcv10)" <jon at esru.strath.ac.uk> wrote:
>
> >
> > And to further the discussion about MRT and PMV
> > assessments....
> >
> > If you do think this is important you might consider
> > ESP-r which
> > allows you to calculate explicit viewfactors within
> > the zone (for any
> > arbitrary shaped room, with or without surfaces
> > acting as furniture
> > and the like ) as well as viewfactors between one or
> > more 'rectangular
> > sensing bodies' in the zone and the surrounding
> > surfaces.
> >
> > Then you can investigate radiant asymetry as
> > well as the usual PMV PPD stats/graphs/frequency
> > bins.  It will
> > tell you not only the surface temperatures but the
> > temperatures within
> > the walls and an energy balance on the zone and at
> > the faces of
> > each surface (including the long wave radiant
> > exchange at the surfaces.
> >
> > Some limitations... if you are also simulating bulk
> > air flows there is
> > no agent to convert the flow rates into
> > approximations of velocity
> > in the room and the clothing and metabolic rate
> > do not change dynamically - you supply these at
> > results recovery
> > time (but then you could pose the question how many
> > times
> > would PMV be over 1.5 if I adjusted the clo value to
> > represent
> > taking off a jacket).  We never got around to making
> > a sensor/thermostat
> > that minics PMV but you can control on resultant
> > temperature or
> > some other ratio of air/MRT or even the temperature
> > of a surface
> > in the room.
> >
> > Really really sad folk could impose a CFD domain and
> > then
> > track the plumes of heat given off by the people in
> > the room
> > and see what happens when the window opens and the
> > wind
> > picks up outside and look at the mean age of air as
> > it changes
> > throughout the day (not recommended to do 3D
> > adaptive transient
> > coupled CFD for hundreds of timesteps because your
> > coffee gets cold
> > and in extreme cases friends give up on you).
> >
> > -Jon Hand, ESRU, Glasgow Scotland.
> >
> >
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> >
>
>
>
>
>
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