hi,
i have a question about setting "driftpoints" in the trace program. i
am doing a base case VS actual design scenario model and i was wondering
what anyone normally uses as cooling/heating dry bulb temps and
thermostat driftpoints when they are modeling a scenario based on simple
ASHRAE guidelines.
jim
For cooling: I usually? use a?setpoint between 72F and 78F depending on the spaces served with a driftpoint of 85F.
For heating: I usually use a setpoing between 68F and 72F depending on the spaces served with a driftpoint of 65F.
For unconditioned spaces I use a very high cooling set point (95F or higher) and a very low heating set points (35F or lower....depending on your weather location) so that the software won't generate any (or very minimal) loads for these spaces.
I don't believe?ASHRAE App G has any?specific thermostat set point requirements.? You just need to use something reasonable and they have to be the same in proposed and baseline models.? A possible exception to this would be if?you are using different thermostat setpoints to simulate the reduced energy associated with an unusual systesm such as a displacement ventilation system or radiant cooling or something.? There may be some archived info on that approach in the bldg-sim archives.
Hope that helps.
J
----- Original Message ----
Hello All,
I am new into the field of energy modeling. I am doing documentation on
my master's project on energy modeling of our office building.
I kindly request for giving me some notes on energy modeling and thermal
storage related to TRACE and in general.
Regards,
Fareed Syed
The tutorial included with the TRACE program (look in the Documentation
folder) is a good way to get familiar with the program itself. To
specifically use TRACE for energy modeling (rather than design, which
some of its components are geared more for), I'd also suggest reading
the section in the Users Manual on 'Altering a load design file for
energy analysis'.
If you're looking for a text for general modeling reference, the IBPSA
organization recommends some energy modeling textbooks and other
references on its website.
Scott Hackel
hi,
what is the difference between the design dry bulbs , driftpoint temps
in the rooms tab and the cooling/heating design set point and set point
limits in the dedicated OA tab? do these have to coincide with each
other?
jim
The temperatures and humidities on the room tab are design conditions for the SPACE conditions.? (i.e. if you want it to be 75F in the space, you can put in 75F on the room tab or on the thermostat template assigned to the room).??These temperatures generally would?not coincide with the temperatures on the?dedicated OA tab or other system level temperature and humidity set point inputs.
?
The temperatures and humidities on the dedicated OA tab (and other systems level tabs) are the temperatures and humidity conditions of the air leaving the air handling unit or coils.(i.e. if you are designing for a leaving air temperature from the AHU of 55F, you would put in 55F).? The set point limits on the dedicated OA tab only come into play if you are asking the program to optimize your supply air temperature and you want to limit?the program's?selection range (presumably to insure some level of dehumidification etc).? All this assumes you have coils in your dedicated OA system to precondition the OA before it reaches the main AHU coils.?
?
?
?
----- Original Message ----
are approved by USGBC for LEED certification process?
Please name the list
Thanks,
Fareed Syed
hi,
what do you normally use for an ASHRAE basebline model for windows? i
see it gives fixed u-factors and shgc coefficients in 90.1, but it
doesnt have glass descriptions...so i was wondering what anyone out
there usually uses.
jim