Patent ID: 9568214
Date: 2017-02-14
CPC Classifications: F23G,F24B,F24H

Claim:
1. A biofuel heating system for converting biofuel to heat energy to be delivered to a working fluid for transferring heat to a load formed by at least one of a domestic hot water system and a domestic space heating system, comprising: a combustion chamber; a burn-out chamber; a burn-out port arranged to allow fluid to flow out of the combustion chamber and into the burn-out chamber; a heat exchange chamber; a heat exchange port arranged to allow fluid to flow out of the burn-out chamber and into the heat exchange chamber; an exhaust port arranged to allow fluid to flow out of the heat exchange chamber; a heat exchange system arranged at least partly within the heat exchange chamber, where the working fluid is circulated between the heat exchange system and the load; a fan arranged to cause fluid to flow out of the heat exchange chamber through the exhaust port; at least one load sensor configured to sense a load operating parameter corresponding to a working fluid temperature of the working fluid after the working fluid returns from the load to the heat exchange system; and a controller for operating the fan based on the load operating parameter such that air flows along a flow path extending through the combustion chamber, through the burn-out port, through the burn-out chamber, through the heat exchange port, through the heat exchange chamber, and out of the exhaust port; an under-fire damper; and an over-fire damper; whereby the heat exchange system transfers heat energy from air flowing through the heat exchange chamber to the working fluid; the controller operates in a char mode based at least in part on the load operating parameter, where