Closed loop capacity and power management scheme for multi stage transport refrigeration system
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United States of America Patent
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Mar 6, 2018
Grant Date -
Jan 15, 2015
app pub date -
Mar 6, 2013
filing date -
Mar 9, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A unit, such as a transport refrigeration unit 12, may include a plurality of components arranged in multiple stages. At least a portion of the components 18,20 may be arranged in a serial or parallel manner. A position associated with the plurality of components may be selected to control a load on a power source, such as an engine 30. For example, a position for each of the components may be selected so as to maximize a delivery of available power from the power source to the unit. In some embodiments, one or more controllers 32,34 may measure a parameter associated with the power source and select a position for one or more of the components. In some embodiments, an economized refrigeration cycle may be used. Capacity may be staged from a single stage compression cycle or mode to a multistage compression cycle or mode, with a corresponding increase in capacity via subcooling.
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