Instantaneous fuel-fired water heater with low temperature...

F - Mech Eng,Light,Heat,Weapons – 24 – H

Patent

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F24H 1/14 (2006.01) F24H 9/18 (2006.01)

Patent

CA 2560651

An instantaneous type fuel-fired water heater has a variable speed blower that discharges combustion air into a fuel burner utilized to heat water flowing through a heat exchanger portion of the water heater. A portion of the air discharged from the blower bypasses the burner and associated heat exchanger, flows around the heat exchanger, and then mixes with flue gases being discharged from the heat exchanger portion into the flue portion of the water heater. In this manner, such flue gases are cooled by the bypassing blower discharge air to an extent permitting the flue portion to be formed from a low cost plastic material instead of a high temperature metal material such as stainless steel.

Chauffe-eau à combustion instantané qui comporte un ventilateur à vitesse variable qui évacue de l'air de combustion dans un brûleur de combustible utilisé pour réchauffer l'eau s'écoulant à travers une partie d'échangeur de chaleur du chauffe-eau. Une partie de l'air provenant de la soufflante contourne le brûleur et l'échangeur de chaleur connexe, circule autour de l'échangeur de chaleur, puis se mélange avec des gaz de combustion évacués à partir de la partie d'échange de chaleur dans la partie de combustion du chauffe-eau. De cette manière, ce gaz de combustion sont refroidis par l'air de dérivation de la tuyère d'évacuation au point de permettre à la formation de la partie de combustion à partir d'un matériau en plastique à faible coût au lieu d'un matériau métallique à haute température tel que de l'acier inoxydable.

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