The present invention comprises an air to air heat exchanger having a circular outer housing and a circular exhaust duct lying there within a long the longitudinal central access thereof. A plurality of cone shaped turbulators are secured to a rod supported within and extending along the longitudinal central axis of the exhaust. The outer housing is made of a heat insulating plastic, and the exhaust duct, turbulators and central rod are made of corrosion resistant metals such as aluminum or stainless steel.
An air to air heat exchange system for removing undesirable air from an enclosed structure. The heat exchanger provides for the removable of air containing pollutants, toxics gases and odors while providing for the recovery of heat from the exhaust air. The system utilizes a plurality of tubes within a larger tube so that air can flow freely over and around the smaller tubes thus providing for maximum heat transfer between the incoming air in the smaller tubes and the exhaust air in the larger tube. The smaller tubes, if used for the incoming air, permit the air to be distributed to various selected locations throughout the structure.
Apparatus and method for removing stale air from a residence or other enclosed space, and replacing that air with fresh air from outside the enclosed space. Stale air outlets are placed at the ceiling in one or more locations throughout the enclosed space and ducts connect those outlets to an air vent elevated in relation to the stale air outlets. An inlet air passage extends between a fresh air inlet located outside the enclosed space, and the air return side of a forced-air heating/cooling unit in the enclosed space. Warm air rises to the ceiling within the enclosed space, increasing in pressure and flowing through the stale air outlets to the relatively lower-pressure outside air. This air flow induces an inward flow of fresh air into the system. The outgoing and incoming air flows move through a heat exchanger, allowing thermal recovery of heat due to differential temperatures between the two air flows. The system operates in a passive mode to exhaust stale air and induct fresh air while the fan of the heating/cooling unit is not operating, and accomplishes the same result in a mechanical mode when the fan operates.
A heat exchanger for mixtures of air and solid particles, particularly for woodworking shops, poultry farms and industrial environments of the like. The heat exchanger comprises a bank of staggered tubes through which warm air is exhausted, a casing with baffles enclosing the bank of tubes such that fresh air is forced between tubes in two or more successive passes, a series of cone-scrapper assemblies equally spaced on a rod inside each tube, and a pull frame connecting all rods, for reciprocating all scrapers in harmony.
