Dear All,
I would like to get your opinions on whether my interpretation of the
following regarding G3.1.2.8 is correct:
My proposed building is conditioned by fan coils and air handler unit
providing ventilation air. In such a system, there are only supply fans
(AHU supply, FCU supply) and exhaust fans (AHU exhaust). There is no
recirculation.
For the baseline case, according to G3.1.1A, I am modeling System 5 -
Packaged VAV with reheat. I am confused about whether to model return fans
with this.
G3.1.2.8 says that if the proposed case has return/relief fans, then the
baseline case should be modeled with these as well.
Does this mean I need to count the exhaust fans in proposed as
return/relief fans and model these in baseline as well in line with
G3.1.2.8?
Thank you for any replies,
Omer Moltay, LEED AP
Dear All,
I would like to get your opinions on whether my interpretation of the
following regarding G3.1.2.8 is correct:
My proposed building is conditioned by fan coils and air handler unit
providing ventilation air. In such a system, there are only supply fans
(AHU supply, FCU supply) and exhaust fans (AHU exhaust). There is no
recirculation.
For the baseline case, according to G3.1.1A, I am modeling System 5 -
Packaged VAV with reheat. I am confused about whether to model return fans
with this.
G3.1.2.8 says that if the proposed case has return/relief fans, then the
baseline case should be modeled with these as well.
Does this mean I need to count the exhaust fans in proposed as
return/relief fans and model these in baseline as well in line with
G3.1.2.8?
Thank you for any replies,
Omer Moltay, LEED AP
I think the exhaust fans in your proposed building would be the equivalent of having relief fans in the baseline system. So the Baseline should have supply and relief fans, with no return fans.
Craig Simmons, LEED AP
Dear All,
I would like to get your opinions on whether my interpretation of the
following regarding G3.1.2.8 is correct:
My proposed building is conditioned by fan coils and air handler unit
providing ventilation air. In such a system, there are only supply fans
(AHU supply, FCU supply) and exhaust fans (AHU exhaust). There is no
recirculation.
For the baseline case, according to G3.1.1A, I am modeling System 5 -
Packaged VAV with reheat. I am confused about whether to model return fans
with this.
G3.1.2.8 says that if the proposed case has return/relief fans, then the
baseline case should be modeled with these as well.
Does this mean I need to count the exhaust fans in proposed as
return/relief fans and model these in baseline as well in line with
G3.1.2.8?
Thank you for any replies,
Omer Moltay, LEED AP
My understanding is The baseline building needs to have the fan power of all fans, supply, return and/or exhaust modeled in accordance with G3.1.2.9. It doesn't really matter if they are return or exhaust. The proposed fan power should be modeled exactly as designed.
Robert Gengelbach, PE, LEED? AP
I think the exhaust fans in your proposed building would be the equivalent of having relief fans in the baseline system. So the Baseline should have supply and relief fans, with no return fans.
Craig Simmons, LEED AP