Re: [EnergyPlus_Support] Re: Thermal Comfort modelling

On Nov 17, 2013 1:22 PM, "hisham.rashrash" <hisham.rashrash@xxxxxxxxx> wrote:

As a matter of fact, I don't know them. What are air temperature flow rates?

Thank you very much.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Oscar Hernandez <eng.ohw@...> wrote:
>
> Did you modify the air temperature flow rates? Do you know them?
> On Nov 17, 2013 12:30 PM, "hisham.rashrash" <hisham.rashrash@...>
> wrote:
>
> >
> >
> > Hi Oscar,
> > Thank you for replying, my thermostat temperature setpoints are 20[C] for
> > heating and 22[C] for cooling. I am even autosizing air flow rates for DOAS
> > and FCUs (for experimenting).
> >
> > In fact, I always have this problem of temperature setpoints not met hours
> > to be very large, like for the example I explained:
> > Time Setpoint Not Met During Occupied Heating: 4341.75[h]
> > Time Setpoint Not Met During Occupied Cooling: 5998[h]
> > Time Not Comfortable Based on Simple ASHRAE 55-2004: 5998[h]
> >
> > I guess this is the main issue, which is, if solved, will solve thermal
> > comfort non-sense. How can I reduce these hours to be in ASHRAE 90.1 range
> > ~300[h]? I even set sizing parameters for heating and cooling to value of 2
> > (for experimenting with autosizing) but didn't change much, it even got a
> > little more worse.
> >
> > Thank you very much for your help.
> >
> > Hisham.
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Oscar Hernandez <eng.ohw@>
> > wrote:
> > >
> > > Hi Hisham,
> > >
> > > You air speed is to low. Try with 0.1 m/s.
> > >
> > > What about the temperature heating/cooling? Maybe it's to high or to low?
> > >
> > > Oscar
> > >
> > >
> > > On 17 November 2013 11:23, hisham.rashrash <hisham.rashrash@>wrote:
> > >
> > > >
> > > >
> > > > Dear all,
> > > > After trying all variations possible, the FangerPMVs and PPDs show very
> > > > large deviation from average, for example: for one office space, PMVs
> > vary
> > > > from around 0 to 4.8 and average is 2.4 around the year (values are
> > > > measured at times HVAC is running only). This corresponds to:
> > > > activity level of 157.5 and
> > > > clothing of 1.025 and
> > > > air velocity of 0.005,
> > > > boilers and chillers are autosized (for other experiments I put real
> > sizes
> > > > which also returned largely ranging PMVs),
> > > > MRT type is ZoneAveraged,
> > > > Sensible Heat Fraction is set to autocalculate,
> > > > Fraction Radiant is 0.3 and
> > > > people density is 25.54 m2/person.
> > > >
> > > > Please advise, how to get these PMVs inside +-0.5 or +-0.7 range for
> > 98%
> > > > of year.
> > > >
> > > > Thanks in advance.
> > > >
> > > > Hisham.
> > > >
> > > >
> > > >
> > >
> >
> >
> >
>