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Re: [EnergyPlus_Support] Re: Thermal Comfort modelling

Did you modify the air temperature flow rates? Do you know them?

On Nov 17, 2013 12:30 PM, "hisham.rashrash" <hisham.rashrash@xxxxxxxxx> 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.


--- 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.
> >
> >
> >


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