Abstract: A fluid heating system including a fluid supply subsystem having a fluid heating device, a fluid output subsystem, and an intermediary fluid device. The fluid heating system also includes a control device for the fluid supply subsystem, a first temperature sensor, a second temperature sensor, and a control circuit coupled to the control device. The control device is configured to control one selected from a group consisting of the fluid heating device and an amount of water input to the intermediary fluid device. The first and second temperature sensors are configured to output first and second temperature signals, respectively. The control circuit is configured to generate a first control signal based on the second temperature signal, determine a multiplier, generate a second control signal based on the first temperature signal, and send a main control signal to the control device based on the first and second control signals.

Abstract: A fluid heating system including a fluid supply subsystem having a fluid heating device, a fluid output subsystem, and an intermediary fluid device. The fluid heating system also includes a control device for the fluid supply subsystem, a first temperature sensor, a second temperature sensor, and a control circuit coupled to the control device. The control device is configured to control one selected from a group consisting of the fluid heating device and an amount of water input to the intermediary fluid device. The first and second temperature sensors are configured to output first and second temperature signals, respectively. The control circuit is configured to generate a first control signal based on the second temperature signal, determine a multiplier, generate a second control signal based on the first temperature signal, and send a main control signal to the control device based on the first and second control signals.

Abstract: A fluid heating system including a fluid supply subsystem having a fluid heating device, a fluid output subsystem, and an intermediary fluid device. The fluid heating system also includes a control device for the fluid supply subsystem, a first temperature sensor, a second temperature sensor, and a control circuit coupled to the control device. The control device is configured to control one selected from a group consisting of the fluid heating device and an amount of water input to the intermediary fluid device. The first and second temperature sensors are configured to output first and second temperature signals, respectively. The control circuit is configured to generate a first control signal based on the second temperature signal, determine a multiplier, generate a second control signal based on the first temperature signal, and send a main control signal to the control device based on the first and second control signals.

Abstract: A fluid heating system including a fluid supply subsystem having a fluid heating device, a fluid output subsystem, and an intermediary fluid device. The fluid heating system also includes a control device for the fluid supply subsystem, a first temperature sensor, a second temperature sensor, and a control circuit coupled to the control device. The control device is configured to control one selected from a group consisting of the fluid heating device and an amount of water input to the intermediary fluid device. The first and second temperature sensors are configured to output first and second temperature signals, respectively. The control circuit is configured to generate a first control signal based on the second temperature signal, determine a multiplier, generate a second control signal based on the first temperature signal, and send a main control signal to the control device based on the first and second control signals.

Abstract: A compressor includes a diffuser, a recirculation duct, and a flow control valve. The recirculation duct has an inlet in fluid communication with the air outlet of the diffuser, and an outlet in fluid communication with the air inlet of the diffuser. The flow control valve is selectively moveable between open and closed positions, to thereby fluidly couple and isolate, respectively, the recirculation duct inlet and outlets. During operation of the compressor, the flow control valve may be opened, which circulates a portion of the compressed air discharged from the diffuser air outlet back to the diffuser air inlet. The air that is circulated back to the diffuser air inlet reduces the effective area of the diffuser air inlet, thereby increasing the surge margin of the compressor.