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Impacts of Static Pressure Set Level on the HVAC Energy Consumption and Indoor Conditions
Abstract
Air static pressure must be maintained at a
certain level leaving the air-handing unit (AHU) to
force a suitable amount of air through the terminal
boxes. However, an excessive static pressure level is
often used due to ( 1 ) lack of a control device in a
constant volume system (CV); (2) malfunctioning
control device in a variable volume (VAV) system;
and (3) fear of failure to maintain room temperature.
High static pressure often develops excessive damper
leakage in older mixing boxes. This results in an
inappropriate mixing of hot and cold air and an
excessive amount of air entering the space.
Consequently, the actual fan power, heating and
cooling energy consumption all become significantly
higher than the design values. Even worse, the system
may not be able to maintain room conditions due to
unwanted simultaneous heating and cooling, and may
be noisy due to the excessive static pressure. This
paper proposes to control the hot duct pressure and
the Variable Frequency Drives ( VFD's) to control
the fan static i.e. the cold duct pressure. Both a
theoretical analysis and a case study results are
presented in this paper.
Citation
Liu, M.; Zhu, Y.; Claridge, D. E.; White, E. (1996). Impacts of Static Pressure Set Level on the HVAC Energy Consumption and Indoor Conditions. Energy Systems Laboratory (http://esl.tamu.edu); Texas A&M University (http://www.tamu.edu). Available electronically from https : / /hdl .handle .net /1969 .1 /6663.