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Hi All,

I am modifying Standard 90.1, 2013 DOE Prototype Primary School Model to have four-pipe chilled beams with DOAS HVAC systems in sections with classrooms. The building is situated in Phoenix, AZ. The problem is that the Calculated Design Loads for heating are sized to be 0s for the zones where I add chilled beams with DOAS. Given the location, lesser heating loads can be expected but not 0s. The other not modified zones still have sizable heating loads. Also, I am modeling CAV for supply air to chilled beams with 55 °F SAT and this should be reflected in the sizing if "Account for Dedicated Outdoor Air System" is selected, but it is not reflected. I have disabled chilled beams heating in response to the sizing but this results in 1653 not met hours during occupied heating. Also, all of the chilled beam inputs are hardsized. I am struggling to find the source of the problem. Here is the link to the model, https://www.dropbox.com/s/fu2ijqvngzuhil5/in.idf?dl=0

Any help would be appreciated.

Thank you.

Hi All,

I am modifying Standard 90.1, 2013 DOE Prototype Primary School Model to have four-pipe chilled beams with DOAS HVAC systems in sections with classrooms. The building is situated in Phoenix, AZ. The problem is that the Calculated Design Loads for heating are sized to be 0s for the zones where I add chilled beams with DOAS. Given the location, lesser heating loads can be expected but not 0s. The other not modified zones still have sizable heating loads. Also, I am modeling CAV for supply air to chilled beams with 55 °F SAT and this should be reflected in the sizing if "Account for Dedicated Outdoor Air System" is selected, but it is not reflected. I have disabled chilled beams heating in response to the sizing but this results in 1653 not met hours during occupied heating. Also, all of the chilled beam inputs are hardsized. I am struggling to find the source of the problem. Here is the link to the model, https://www.dropbox.com/s/fu2ijqvngzuhil5/in.idf?dl=0

Any help would be appreciated.

Thank you. you.

Hi All,

I am modifying Standard 90.1, 2013 DOE Prototype Primary School Model to have four-pipe chilled beams with DOAS HVAC systems in sections with classrooms. The building is situated in Phoenix, AZ. The problem is that the Calculated Design Loads for heating are sized to be 0s for the zones where I add chilled beams with DOAS. Given the location, lesser heating loads can be expected but not 0s. The other not modified zones still have sizable heating loads. Also, I am modeling CAV for supply air to chilled beams with 55 °F SAT and this should be reflected in the sizing if "Account for Dedicated Outdoor Air System" is selected, but it is not reflected. I have disabled chilled beams heating in response to the sizing but this results in 1653 not met hours during occupied heating. Also, all of the chilled beam inputs are hardsized. I am struggling to find the source of the problem. Here is the link to the model, https://www.dropbox.com/s/fu2ijqvngzuhil5/in.idf?dl=0

Any help would be appreciated.

Thank you.