Patent ID: 8253267

Claim:
An energy recovery method for recovery of energy from a gas flow transmitted by a gas flow channel of a gas flow source of a heating, ventilation, air conditioning or exhaust system, the method comprising: providing a conduit having a first end and a second end; coupling the first end of the conduit to receive the gas flow and to transmit a first portion of the received gas flow from the first end thereof toward the second end thereof; coupling a blade assembly to the conduit, so that the blade assembly is moved when the first portion of the received gas flow is transmitted from the first end of the conduit; driving an electrical generator coupled to the blade assembly to generate electricity when the blade assembly moves; and configuring a portion of the conduit so that a second portion of the gas flow transmitted by the gas flow channel can bypass the blade assembly to limit back pressure on the gas flow source; further comprising coupling a shroud member to the second end of the conduit, wherein the blade assembly is disposed within the shroud member; wherein the shroud member includes an air intake port defined therethrough, wherein the air intake port is configured to receive an ambient gas outside the conduit and direct the ambient gas toward the blade assembly, the blade assembly comprising at least one of a first blade assembly and a second blade assembly.