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Method and apparatus for determining critical pressure of variable air volume heating, ventilating, and air-conditioning systems

United States Patent Application

View the Complete Application at the US Patent & Trademark Office
A strategy for determining the critical supply duct pressure in variable-air-volume heating, ventilating, and air-conditioning systems that compensates for duct leakage and variable loads, enabling its use during normal system operation. The strategy consists of a static pressure sensor, an airflow sensor, a supply fan, a fan modulating device, a controller coupled to the static pressure sensor and the airflow sensor, and a data processing algorithm for analyzing results from a function test using these components. The functional test involves changing the supply duct pressure setpoint, waiting for equilibrium, recording pressure, flow, and time, then changing the supply duct pressure setpoint to the next setting in the sequence.
Federspiel, Clifford Conrad (El Cerrito, CA)
11/ 001,369
December 1, 2004
[0001] "This invention was made with State of California support under California Energy Commission Grant number 02-03. The Energy Commission has certain rights to this invention."