Modeling an incomplete heating system

asked 2016-01-14 14:58:17 -0500

Hello, I’m working on a Core & Shell office building in Bogota and the baseline system is 8. The building has a central cooling system with chillers and air handle units in each floor, it doesn’t have a heating system. According to the G3.1.10 (c) table of ASHRAE 90.1, the proposed model must have a heating system equal to the baseline, ie electrical resistance and parallel fan-powered boxes (PFP). I don’t want to model PFP boxes in the proposed model due to the fan power consumption. I don’t want neither to model a lower heating temperature setpoint because the fan in the PFP box would be working all the time. To meet the baseline heating system, Can I use only an electric resistance in the air handle unit or placing a simple reheater in the zone enough? Or is necessary to model PFP boxes with a heating coil in each zone? Thank you.

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answered 2016-01-27 18:49:44 -0500

rraustad

13599 ●72 ●12 http://www.fsec.ucf.edu/

updated 2016-01-28 08:29:11 -0500

For the proposed building design, where no heating or cooling systems exist or have been specified, the heating or cooling systems shall be assumed to be electric and the system characteristics shall be identical to the systems modelled in the baseline building design (Table G3.1 - 10. HVAC Systems).

There is an exception (Table G3.1 - 4. Schedules) for fans that provide outdoor air for ventilation shall run continuously during occupied hours and cycle otherwise. Where no heating and/or cooling system is to be installed and the system is simulated only to meet Appendix G requirements, fans may be modeled to cycle on and off to meet heating and cooling loads during ALL hours