Multi-variable control of refrigerant systems
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United States of America Patent
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-
Feb 7, 2006
Grant Date -
Sep 8, 2005
app pub date -
Mar 4, 2004
filing date -
Mar 4, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A control particularly useful for a hot water heating system, includes calculation of a desired leaving water temperature for water leaving a hot water heat exchanger, and a desired refrigerant condition for most efficiently achieving the desired leaving water temperature. A control looks at both desired variables and compares them to actual variables to determine an error for each. The control includes an error correction algorithm for each of the two variables that takes into account both of the errors, the integral of both of the errors, and the derivative of both of the errors. In this way, sensitivity in the error correction for one variable due to changes in the other variable is reduced, and the system functions more efficiently.
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