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Re: [EnergyPlus_Support] Minimum Input to calculate load requirements
1) This seems like a good "minimum" requirement for what you intend to
do. If you only wanted to look at sun angles (I believe there is an
example file called minimal.idf that does this), you would not even need
to define the building constructs, so it depends on what your simulation
results need to be to determine what the minimal required input is.
2) Purchased air is an ideal cooling or heating system with unlimited
capacity. You can use this object to get an idea of zone sensible loads.
It's not a good choice to determine the zone latent loads. And you will
most likely need to replace the purchased air object with an HVAC system
to see how actual cooling load vary with real systems.
3) The sensible load predicted tells you what the thermostat thinks the
load is to get the zone back to the set point. If the zone meets the
setpoint, this is a good indicator of sensible load. There are other
report variables that could be used, for example the purchased air
object has its own report variables, See the InputOutput Reference and
look at the section called Purchased Air Outputs. Report out Purchased
Air Sensible Cooling Rate and compare it to Zone/Sys Sensible Load
Predicted. These should be nearly the same values.
4) Most everything in the simulation affects the cooling load. If you
are asking how the zone cooling load is calculated, see equation 2 in
the Engineering Reference.
noplayer101 wrote:
>
> Hi Guys,
>
> I am new to EnergyPlus and in general the whole HVAC world.
>
> As a first step I just wanted to implement a simple single zone
> building (i.e rectangular box) and just determine the cooling load
> required for it.
>
> So I 1)Defined just the building with 6 surfaces, 2) added Purchased
> Air (I assumed it was an necessary input do get the cooling load),
> 3)Set a Dual Setpoint with Deadband, and 4) Outputed Sensible Load
> Predicted.
>
> I run the simulation with a weather file for a year (reporting daily).
>
> First, am a correct to assume this is the minimum setup needed.
> Second, what exactly is purchased air. The help file's definition is
> a bit confusing to me. Lastly, am I viewing the correct output for
> the cooling load (also where can I find what factor determine it's
> value i.e outside temp, surface material, etc)
>
> Thank you very much! :-)
>
>
--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
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