Fluid heater with improved heating elements controller

Details Fluid heater with improved heating elements controller Fluid heater with improved heating elements controller

H - Electricity

05

B

H05B 1/02 (2006.01) F24H 9/20 (2006.01) G05D 23/19 (2006.01) G05D 23/24 (2006.01)

Patent

CA 2234145

An electrically powered water heater (10) includes a plurality of heating elements (22, 34, 44 and 50) for substantially instantaneous heating of fluid passing through the heater. A controller for powering the plurality of heating elements is responsive to a temperature sensor (30) in fluid communication with the heated fluid. The temperature sensor activates each of the plurality of heating elements for a predetermined period of time that is preferably no more than 32 half cycles. The controller activates a second heating element (34) after a delay of preferably no more than 8 half cycles after activating a first heating element (22). The predetermined period of time for activating each of the plurality of heating elements may be substantially equal, such that each heating element contributes substantially equally to the heating of fluid. In one embodiment, the heater housing is provided with a plurality of chambers (9), and a heating element is provided within each of the plurality of chambers.

Cette invention se rapporte à un chauffe-eau fonctionnant électriquement, qui comprend plusieurs éléments chauffants servant essentiellement au chauffage instantané du fluide passant à travers le chauffe-eau. Un contrôleur, qui alimente les éléments chauffants, réagit à un capteur de température en communication fluide avec le fluide chauffé. Le capteur de température active chacun des éléments chauffants pendant une période prédéterminée qui n'est de préférence pas supérieure à 32 demi-cycles. Le contrôleur active un second élément chauffant après un délai qui n'est de préférence pas supérieur à 8 demi-cycles, après l'activation d'un premier élément chauffant. La période prédéterminée pour l'activation de chacun des éléments chauffants peut-être sensiblement la même, pour que chacun des éléments chauffants contribue de façon sensiblement égale au chauffage du fluide. Dans un mode de réalisation, le logement du chauffe-eau comporte plusieurs chambres et un élément chauffant est placé dans chacune de ces chambres.

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