Abstract: An energy recovery ventilator and method for monitoring and maintaining an environmental condition inside a structure such as a house, building, or dwelling is provided. The ventilator may include a housing having mating halves of a molded polymeric material, first and second chambers disposed within the housing to convey separate first and second streams of air, a heat exchanger configured to intersect the first and second chambers, a first fan to circulate the first air stream through the first chamber, a second fan to circulate the second air stream through the second chamber, and a fan motor driving the first and second fans. The ventilator may also be configured to prevent frost build-up in or on the energy ventilator, to provide efficient cooling, and maintain one or more desired environmental conditions.

Abstract: A ventilator includes a ventilator housing defining an exhaust air flow section and a fresh air flow section, a rotary wheel, a heat and moisture exchange media supported by the rotary wheel and intersecting the exhaust air flow section and the fresh air flow section, a rotary wheel mounting assembly including a first set of guide rollers in contact with a first rim edge portion of the rotary wheel and a second set of guide rollers in contact with a second rim edge portion of the rotary wheel, and a drive roller in contact with one of the rim edge portions. A hub and bearing assembly is provided such that the rotary wheel may tilt with respect to the mounting assembly. A rotary wheel access plate defines an exhaust air outlet and a fresh air inlet and is equipped with an access plate opening assembly. A moisture transfer wick extends across a partition assembly between the exhaust air flow section and the fresh air flow section.

Abstract: A heat recovery ventilator having a rotary wheel heat exchanger includes a unique configuration for driving both the rotary wheel heat exchanger and impellers to provide an inexpensive, compact and light-weight ventilator unit adaptable for use across a wide range of residential, commercial and industrial applications. A random matrix media is also used to provide high thermal efficiency in exchanging heat and moisture between inlet and exhaust air streams.

Abstract: A heat recouperator having a rotary wheel heat and moisture exchanger uses a random matrix media comprising a plurality of small diameter heat-retentive fibrous material which provides high thermal efficiency in exchanging heat and moisture between inlet and exhaust air streams.

Abstract: A heat recovery ventilator having a rotary wheel heat exchanger uses a random matrix media of randomly interrelated small diameter heat-retentive fibrous material to provide high thermal efficiency in exchanging heat and moisture between inlet and exhaust air streams for residential, commercial and industrial applications.

Abstract: A heat recouperator having a single rotary heat and moisture wheel exchanger uses a random matrix media comprising a plurality of small diameter heat-retentive fibrous material, which provides high thermal efficiency in exchanging heat and moisture between inlet and exhaust air streams.

Abstract: The invention comprises both apparatus and an accompanying method for the controlling of the speed, stroke and power output of a Stirling engine. The invention positions a valving arrangement to control the working gas flow within a gas flow passage connecting the hot end and cold end of the displacer cylinder; the valving arrangement is controlled by a suitable engine speed, stroke or power detector.

Abstract: An improved crank-type Stirling engine. A spring, preferably a gas spring, is linked between the displacer and the housing or alternatively the power piston. The spring is relaxed at substantially a mean position of the displacer to apply a centering force upon the displacer. The spring reduces the loading on the displacer drive linkage by itself exerting a centering force upon the displacer. If desired, displacer linkage forces may be reduced nearly to zero by designing the spring so that the spring constant and the masses upon which it operates are in resonance. The gas spring mechanism may include pump elements so that it will operate as a pump to charge the engine to operating pressure with atmospheric air during initial start up operation.