Reducing power consumption in a compressive heating system
Senneff, James L
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Compressive heating of an air stream can be used to kill airborne bacteria (U.S. Patent Application #10/765,807 "Method of Altering a Fluid-Borne Contaminant"). However several factors must be optimized to make this practical. It has been demonstrated that a Roots-type mechanism can achieve air stream temperatures high enough to destroy an anthrax simulant. Reducing the outlet stream temperature is necessary before the purified air can be channeled into an inhabited area. Furthermore, it is essential to reduce the power consumption of the device by recovering the energy input into the stream. Through the experimental study, it was shown that a heat exchanger can decrease the power consumption required to achieve the same treatment temperature as the original system while decreasing outlet temperature and increasing flow rates. The heat exchanger (HE) increased flow rates 27.47%, reduced absolute outlet temperatures 42.48% and decreased power consumption 20.29% with effectiveness of 56.66%. It has further been shown that the CACHeS program (Cycle Analysis for Compressive Heating System), created for this study, can model the experimental results. Using Chapter II lessons, the CACHeS software can then be used to provide a more efficient system with a counter flow HE and increased size. This results in an effectiveness of 85.9%, outlet temperature reduction of 79.4%, flow increase of 27%, power reduction of 63.73% with power/mass flow gain of 83.6%.