Re: [EnergyPlus_Support] rated air volume flow rate of CoolingBypassFactorEmpirical

["Michael J. Witte" <mjwitte@xxxxxxxx>]

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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