Abstract: A method includes: deriving a set of operational states of a refrigeration system based on combinations of actuator positions; accessing a set of timeseries sensor data captured by sensors associated with a refrigeration system; accessing a set of refrigeration system rules specifying nominal behavior of refrigeration components in distinct operational states; generating a set of forecast sensor data representing predicted behavior of the refrigeration system in operational states based on a segment of timeseries sensor data, representing the operational state, and the set of refrigeration system rules; detecting a deviation, in a set of forecast sensor data representing predicted behavior of the refrigeration system in an operational state, from nominal thermodynamic behavior of refrigeration components in the operational state; detecting a refrigeration component associated with the deviation according to a graph of the refrigeration system; and flagging the refrigeration component for inspection prior to p

Abstract: An ozone generator (10) has top and bottom chambers (12, 14) interconnected by a vertically extending elongated tubular assembly (16). Assembly (16) has a control electrode (18) within a conductive tube member (20) and separated therefrom by an annular dielectric member (22) which only partly fills the space between items (18, 20). The dielectric member (22) is suspended by an O-ring at its upper end within the top chamber (12) and is free from contact with both the electrode (18) and the tube member (20). Gas flow between the top and bottom chambers (12, 14) is along radially inner and outer annular passageways within the assembly (16) and the top chamber (12) is partitioned into two chambers which respectively communicate with these passageways. The generator (10) may have a plurality of similar assemblies (16) extending in parallel between common top and bottom chambers (12, 14).