System for changing fluid temperature and method for controlling such a system
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United States of America Patent
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Feb 21, 2012
Grant Date -
Jul 30, 2009
app pub date -
Jan 27, 2009
filing date -
Jan 29, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system for changing the temperature (T.sub.1) of a fluid such as an on-demand water heater is disclosed. The system comprises an input for receiving the fluid (120) at a first temperature (T.sub.1) and an output for delivering the fluid at a second temperature (T.sub.2). A conduit connects the input to the output, and comprising means such as a heating element for altering the temperature of the fluid from the first temperature (T.sub.1) to the second temperature (T.sub.2). The system is characterized by the presence of one or more virtual sensors for estimating the fluid temperature in a given location within the conduit. The system provides accurate fluid temperature control without suffering from the slow responsiveness that usually mars sensor-based systems.
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