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How to model HVAC system without chiller/boiler eqmt. info in Openstudio?

asked 2015-02-07 20:37:25 -0500

mit011 gravatar image

I am trying to model a HVAC system for a 4-story building with ~400 zones (cooling with zone reheat). This building has chilled and hot water supplied from the central plant, for which I have no information aside CHWS/CHWR/HWS/HWR flow and temperature. The chilled and hot water are in separate parallel loops - the chilled water cools the outside air which then goes into VAV boxes with reheat coils which are served by the hot water (neglecting service hot water in this case). The chilled/hot water are both supplied through shafts from the basement, then into ducts for each zone. I have attempted a model, explained below, but would appreciate confirmation that I am interpreting OSM correctly!

In OSM's HVAC systems tab, I chose the "Packaged Rooftop: VAV with Reheat" template. Since I only have CHW and HW flow/temp info, I deleted the 1) "Condenser Water Loop", 2) "Chilled Water Loop", 3) the hot water coil on the supply side of the "VAV with Reheat Loop". I plan to have the ~400 zones linked in parallel to the "VAV with Reheat Loop", each with a "AirTerminal Single Duct VAV Reheat" that is linked to the "Hot Water Loop". Additionally, I plan to enter the design water flow rate and inlet/outlet water temperature for the cooling coil.

Is this approach correct? Any help is much appreciated!

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answered 2015-02-09 00:39:22 -0500

updated 2015-02-09 08:25:50 -0500

You probably want to keep the Chilled water loop, but put a District Cooling Object on the supply side as shown in this screenshot, in place of the chiller that was there to start with.

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Asked: 2015-02-07 20:37:25 -0500

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Last updated: Feb 09 '15