Re: [EnergyPlus_Support] system sizing

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

In general, you cannot mix and match autsizing with specified sizes.  
In the zone sizing object, you can specify design air flow rates for 
both heating and cooling and let everything else autosize 
accordingly.  See the Input Output Reference explanation for the Zone 
Sizing object.

Mike


On 5 Jun 2003, at 11:15, idoebber wrote:

> I am sizing my air loop system which consists of the air to air heat
> pump (UNITARYSYSTEM:HEATPUMP:AIRTOAIR).  I want to size the entire
> system based upon the cooling coil requirements.  Therefor, I want the
> maximum air flow rate based upon that needed by the cooling system and
> the cooling coil capacity to be sized strictly on what is necessary
> for the design cooling load.  The current system I have now sizes to
> meet the heating loads since the necessary heating maximum design air
> flow rate is roughly 0.2 m3/s greater then the cooling maximum design
> air flow rate.  Also, the design heat load is roughly 3 kW greater
> then the design cool load.  The remaining heating load that the heat
> coil can not satisfy I want to be met with the supplemental heating.
> 
> What I want to know is how can I manipulate the IDF file in order to
> size the system based upon the cooling requirements.   I have already
> tried to set the cooling capacities and all the air flow rates to that
> specified to meet just the design cooling load and left the heat
> capacity and supplemental heating to autosize.  When I try to run
> this, Energy Plus shuts down not giving me an error message.  Can I
> specify sizes on certain inputs such as the cooling capacity and flow
> rates but just autosize the heating coil and supplemental heating?
> 
> Thanks
> Ian
> 
> 
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