Ali,
As far as the initial temperature is concerned, set it in
between the heating setpoint and cooling setpoint temperature and
it won't have any impact on what your peak heating and cooling
loads are. When the zone temperature is between the heating and
cooling setpoint then by definition there is no load on the space.
As a side note, I would caution against sizing HVAC equipment
based on a short term simulation. I mention it becuase in long
term simulations the initial value has little impact and if your
initial zone temperature does have a significant impact then it
might be that your simulation is short. In any case, I'd recommend
running a year or two or at least december plus a year so that any
initial values that the simulation starts with aren't impacting
your results. If you're running a case in which you have a lot of
thermal coupling with the ground and are modeling the ground
temperature as impacted by the presence of the building (using
Type49 for example) then you should be running a 5-10 year long
simulation so as to get away from any initial value bias.
As for your second question if you impose a humidity setpoint on
your building then as with temperature, Type56 will limit the
building's humidity and report the amount of latent energy that
had to be added or removed in order to keep it between the
setpoints.
kind regards,
David
On 1/9/2023 4:21 PM, Ali Shahrouzian
via TRNSYS-users wrote:
Dear all TRNSYS user,
Hi,
I have two questions about estimating the
size of HVAC system of a building.
My 1st question:
As you know, there is a good explanation in
09-Tutorial document regarding estimating the size of HVAC
equipment of a building by using the printegrator component
(setting its parameter #4 to 15 min and determining the peak
15-minute heating and cooling load for building). However, it
is evident that the maximum 15-minute heating and cooling load
for the building is highly dependent on the initial
temperature of the building, which is set on TRNBuild. When
starting a simulation, what should the initial temperature be?
My 2nd question:
How can I estimate the size of humidifier
or dehumidifier in the HVAC equipment?
I’d be glad if someone
could help me out.
Best regards,
Ali
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David BRADLEY
Principal
Thermal Energy System Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI 53703 USA
P:+1.608.274.2577
d.bradley@tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com