A system comprising: a gravity-fed housing having a receive end and a discharge end, comprising: a receiving end panel that forms a receive opening in a first plane, the receive opening being configured to receive a first plurality of heat carriers via gravity; and a siding connected to the receiving end panel, the siding forming a chamber and a discharge opening in a second plane that is parallel to the first plane, the discharge opening being offset with respect to the receive opening such that a line perpendicular to the receiving end panel that extends through a center point of the receive opening does not intersect a center point of the discharge opening, the siding including a first panel that comprises a guiding surface that intersects the line and is angled in a direction toward the discharge opening, the siding forming a purge gas inlet configured to allow a purge gas to enter the gravity-fed housing, and a purge gas outlet configured to allow the purge gas to be discharged from the gravity-fed housing; a purge gas inlet mechanism comprising: a purge gas inlet controller; and a purge gas inlet valve; wherein the purge gas inlet controller is configured to: selectively open the purge gas inlet valve to allow entry of the purge gas into the gravity-fed housing, and close the purge gas inlet valve to prevent entry of the purge gas into the gravity-fed housing; and a purge gas outlet mechanism comprising: a purge gas outlet controller; and a purge gas outlet valve; wherein the purge gas outlet controller is configured to: selectively open the purge gas outlet valve to allow discharge of the purge gas from the gravity-fed housing, and close the purge gas outlet valve to prevent discharge of the purge gas from the gravity-fed housing. a receiving end panel that forms a receive opening in a first plane, the receive opening being configured to receive a first plurality of heat carriers via gravity; and a siding connected to the receiving end panel, the siding forming a chamber and a discharge opening in a second plane that is parallel to the first plane, the discharge opening being offset with respect to the receive opening such that a line perpendicular to the receiving end panel that extends through a center point of the receive opening does not intersect a center point of the discharge opening, the siding including a first panel that comprises a guiding surface that intersects the line and is angled in a direction toward the discharge opening, the siding forming a purge gas inlet configured to allow a purge gas to enter the gravity-fed housing, and a purge gas outlet configured to allow the purge gas to be discharged from the gravity-fed housing; a purge gas inlet mechanism comprising: a purge gas inlet controller; and a purge gas inlet valve; wherein the purge gas inlet controller is configured to: a purge gas inlet controller; and a purge gas inlet valve; wherein the purge gas inlet controller is configured to: selectively open the purge gas inlet valve to allow entry of the purge gas into the gravity-fed housing, and close the purge gas inlet valve to prevent entry of the purge gas into the gravity-fed housing; and a purge gas outlet mechanism comprising: a purge gas outlet controller; and a purge gas outlet valve; wherein the purge gas outlet controller is configured to: a purge gas outlet controller; and a purge gas outlet valve; wherein the purge gas outlet controller is configured to: selectively open the purge gas outlet valve to allow discharge of the purge gas from the gravity-fed housing, and close the purge gas outlet valve to prevent discharge of the purge gas from the gravity-fed housing.