The potential of static pressure reset (SPR) control to save fan energy in variable air
volume HVAC systems has been well documented. Current research has focused on the creation
of reset strategies depending on specific system features. As the commissioning process has
begun to require the prediction of savings, knowledge of the extent to which various SPR control
strategies impact fan energy has become increasingly important. This research aims to document
existing SPR control strategies and utilize building data and simulation to estimate fan energy
use.
A comprehensive review of the literature pertaining to SPR control was performed and
the results were organized into a top-down flow chart tool. Based on the type of feedback
available from a particular system, or lack thereof, this tool will facilitate the selection of a SPR
control strategy. A field experiment was conducted on a single duct variable air volume system
with fixed discharge air temperature and static pressure setpoints. Finally, an air-side model of
the experimental system was created using detailed building design information and calibrated
using field measurements. This model was used to estimate the fan energy required to supply
the trended airflow data using fixed static pressure (FSP) and SPR control based on zone
demand, system demand, and outside air temperature.
While utilizing trend data from November 1, 2008 to February 12, 2009, the FSP control
of the experimental system was used as the baseline for ranking the energy savings potential of
nine different forms of duct static pressure control. The highest savings (73-74%) were achieved
using zonal demand based SPR control. System demand based SPR control yielded savings
ranging from 59 to 76%, which increased when the duct sensor was positioned near the fan
discharge and under similar zone load conditions. The outside air temperature based SPR
control yielded savings of 65% since the experimental system supplied primarily perimeter
zones. Finally, increasing the FSP setpoint from 2 to 3 inWG increased fan energy by 45%,
while decreasing the setpoint from 2 to 1 inWG decreased fan energy by 41%.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-2009-12-7332 |
| Date | 2009 December 1900 |
| Creators | Kimla, John |
| Contributors | Claridge, David E. |
| Source Sets | Texas A and M University |
| Language | English |
| Detected Language | English |
| Type | thesis, text |
| Format | application/pdf |
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