Heat recovery ventilator with room air defrosting feature
AssigneeNutech Energy Systems Inc.
InventorsPeter K. Grinbergs, Grant W. Miles
Life of this patent
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Abstract
A heat recovery ventilator for use in ventilating a building, the ventilator having a single two-position damper operable such that in one damper position, heat is exchanged between a first flow of fresh air passing through the first path and a second flow of exhaust air passing through the second air path. When placed in the second damper position, fresh air is blocked from entering the ventilator and exhaust air is recirculated, passing through both air paths, and exiting through the fresh air outlet. In this mode of operation, exhaust air is inhibited from exiting through the exhaust outlet due to the relative pressures within the ventilator, thereby inhibiting the formation of a negative pressure within the building.
Claims13
A heat recovery ventilator for transferring heat between a first airflow and a second airflow comprising:
- a housing;
- a first airflow path defined between a first inlet and a first outlet;
- a second airflow path defined between a second inlet and a second outlet;
- a heat transfer means to transfer heat between airflows in said first and second airflow paths;
- a blower means to induce said first and second airflows;
- a damper means comprising a substantially flat gate movable between a first damper position in which said first and second airflow paths are substantially isolated from one another within said housing and said first and second airflows pass through said heat transfer means and said first and second air paths respectively, and a second damper position wherein said first inlet is blocked and where substantially all of said second airflow air is redirected from said heat transfer means to said first airflow path adjacent said blocked first inlet, said redirected second airflow passing through said heat transfer means to defrost said heat transfer means and then exiting said first outlet;
- and
- a control means to control said damper means.
Dependencies are inferred from the claim text.