Fast recovery electric fluid

摘要

A high efficiency fast recovery electric fluid heating system includes a closed elongated housing having thermostatically controlled high-wattage electric immersion heating elements extending from the housing ends into the interior thereof. The housing is adapted to be filled with fluid to be heated by the heating elements and has a fluid inlet at one end and a fluid outlet at the other. A helical tubular member extends within the housing from end to end thereof in coaxial spaced relationship to the heating elements and has its ends extending externally of the tank to provide inlet and outlet connections for supply of fluid thereto. An elongated open-ended tubular member is disposed within the helical tubular member and around the heating elements to define a confined fluid heating space within the housing. The elongated tubular member is provided with a plurality of elongated apertures midway along its length to allow circulation of highly heated fluid from the confined space into heat exchange relationship with the helical tubular member. In another embodiment, a second oppositely wound helical tubular member is disposed coaxially about the first helical tubular member and has fluid inlet and outlet ends extending externally of the housing. An additional helical tubular member may be wound about and in contact with the exterior of the housing and connected in series with a helical tubular member in the housing to capture heat radiating from the walls of the housing. The same or different fluids can be caused to flow through the housing and the helical tubular members for heating.