[BLDG-SIM] Zone mean radiant temperature in eQuest
Gerald Pde
geraldpde at yahoo.com
Sat Oct 28 13:05:45 PDT 2006
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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