Feedback regulated induction heater for a flowing fluid

Patent · Tue Dec 24 04:00:00 EST 1985

OSTI ID:5745349

Migliori, A; Swift, G W

A regulated induction heater for heating a stream of flowing fluid to a predetermined desired temperature. The heater includes a radiofrequency induction coil which surrounds a glass tube through which the fluid flows. A heating element consisting of a bundle of approximately 200 stainless steel capillary tubes located within the glass tube couples the output of the induction coil to the fluid. The temperature of the fluid downstream from the heating element is sensed with a platinum resistance thermometer, the output of which is applied to an adjustable proportional and integral feedback control circuit which regulates the power applied to the induction coil. The heater regulated the fluid temperature to within 0.005/sup 0/ C. at a flow rate of 50 cm/sup 3//second with a response time of less than 0.1 second, and can accommodate changes in heat load up to 1500 watts.

• Assignee: The United States of America as represented by the United States Department of Energy
• Patent Number(s): US 4560849
• OSTI ID: 5745349
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
CONTROL
CONTROL SYSTEMS
DESIGN
ELECTRIC COILS
ELECTRIC HEATING
ELECTRICAL EQUIPMENT
ENGINES
EQUIPMENT
FEEDBACK
FLUIDS
HEAT ENGINES
HEAT TRANSFER FLUIDS
HEATERS
HEATING
HYDROGEN COMPOUNDS
MACHINERY
MEASURING INSTRUMENTS
MONITORING
OXYGEN COMPOUNDS
REFRIGERATING MACHINERY
RESISTANCE HEATING
RF SYSTEMS
TEMPERATURE CONTROL
TEMPERATURE MONITORING
THERMOMETERS
WATER