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[EnergyPlus_Support] Re: rated air volume flow rate of CoolingBypassFactorEmpirical
Hi, everyone:
Especially for Mike Witte, thank you very much!!
B-1.
I have checked the maximum air flow rate in the Window AC object is
the same as the Rated air volume flow rate in the DX coil object.
but the error message still showed after simulation.
Further, I tried to change the setting cooling temperature from 26C to
24C in DAYSCHEDULE object, then the simulation ran successfully. Do
you have any ideas about that??
but even the simulation ran susscessfully for the case of 24C setting,
the mean air temperautre in that zone is not fixed as the setting
cooling tempertuare(24C).
by the way, Is there any simple example talking about the central
cooling system in a zone or for one building??
--- In EnergyPlus_Support@y..., "Michael J. Witte" <mjwitte@g...> wrote:
> A. If you have windows, solar gains will heat the space to be warmer
> than the outside air. Also, internal gains such as people and
> equipment will heat the space. So it is quite possible for an
> unconditioned space with no ventilation to get this warm. For
> example, think of a closed up car sitting in the hot sun.
>
> B-1. The restriction on airflow is "Rated Air Volume Flow of
> CoolingBypassFactorEmpirical should be between 0.00004699-0.00006041
> m3/s PER WATT OF RATED TOTAL COOLING CAPACITY." The error message is
> indicating that your airflow rate is not consistent with the rated
> capacity of the DX coil. Note that you must make sure that flow
> rates and capacities are consistent in the Window AC object and the
> DX coil object. They are not automatically matched.
>
> B-2. You should see the setpoint properly maintained once you get
> rid of the air flow errors.
>
> Mike Witte
>
>
>
> On 13 Sep 2002, at 12:11, rmp4aup6 wrote:
>
> > hello, sorry to bother you everyday!!
> >
> > I am running a simulation for a room with 24m*11m*4m
> >
> > what strange is that
> > A. for the case without air conditioners
> > the outdoor dry bulb is 35C at noon, but the mean air temperature in
> > that at noon is about 54C, is it normal??
> >
> > B. for the case with 5 window air conditioners
> > Although the simulaiton completed successfully , it shows some warning
> > messages that I don't know how to solve. As below:
> >
> > ** Warning ** COIL:DX:CoolingBypassFactorEmpirical "ZN001WINDACDXCOIL"
> > - Air volume flow rate per watt of rated total cooling capacity is out
> > of range on MM/DD HH:MM.mm= 7/31 07:35.00
> >
> > ** Warning ** COIL:DX:CoolingBypassFactorEmpirical
> > "ZN001WINDACDXCOIL5" - Air volume flow rate per watt of rated total
> > cooling capacity is out of range error continues...100
> >
> > ** Warning ** AIR CONDITIONER:WINDOW:CYCLING -- Exceeded max
> > iterations while adjusting compressor runtime to meet the zone load
> > within the cooling convergence tolerance. ** ~~~ ** For
> > WindowAC=ZN001WINDAC, Iterations=15
> >
> > B-1
> > the reference said that the Rated Air Volume Flow of
> > CoolingBypassFactorEmpirical should be between 0.00004699-0.00006041
> > m3/s, but I set it as 0.6, the same as the Example WindAC.idf.
> > something wrong??
> >
> > B-2
> > I set the cooling setpoints to be 24C, but I found that the mean air
> > temperature is not steady. most of the time is below 23C
> >
> > thank you very much
> > thank you very much
> >
> >
> >
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