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Optimize the Supply Air Temperature Reset Schedule for a Single-Duct VAV System
Abstract
The supply air temperature for a single-duct
variable air volume (VAV) system is usually set as a
constant. To minimize the simultaneous cooling and
heating, this supply temperature is often reset based
on either return air temperature or outside air
temperature. However, resetting the supply air
temperature not only impacts the cooling and heating
energy consumption, but also the fan power
consumption. If reset improperly, it may cause
indoor air humidity problems or result in a fan power
consumption penalty. This paper investigates the
major factors that impact the optimal supply air
temperature reset schedule which minimizes the
overall heating energy, cooling energy and fan power
consumption. Simulation results are compared for
systems with different interior area ratios, load
conditions, minimum supply airflow rates, and
thermal to electrical energy price ratios.
Citation
Wei, G.; Claridge, D. E.; Liu, M. (2000). Optimize the Supply Air Temperature Reset Schedule for a Single-Duct VAV System. Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from https : / /hdl .handle .net /1969 .1 /6786.