Abstract: A system for recovering the waste heat normally exhausted into the atmosphere by chemical or other processing plants. The invented system comprises a substantially self-contained apparatus for receiving hot exhaust gases and extracting the waste heat therefrom for some beneficial use, such as pre-heating inlet air in an inlet plenum. The system may include temperature and pressure controls which enhance the safety and efficiency of the system's operation, and further may include flow controls in a multiple burner installation so that the desired fuel air ratios and heat distribution may be achieved. By building the present invention as a substantially self-contained and self-supporting assembly, on site installation time and the required alteration of pre-existing on site equipment may be minimized, thereby affecting substantial economic savings by minimizing the resulting down time of the processing plant.

Abstract: A heat pipe recuperator for recovering heat from flue gas stacks is disclosed. The recuperator consists of a toroidal shell forming a fluid heating chamber having inlet and outlet fluid circulating ports. A plurality of heat pipes are mounted within the chamber and are attached to the inner wall of the shell such that the condensor sides of the pipe reside within the shell and the evaporator sides extend outside the shell into the center of the toroid. The recuperator is positioned in a flue gas stack wherein the hot flue gas stream contacts the heat pipes which transfer heat into the fluid heating chamber. Fluid, gas or liquid, is passed through the chamber resulting in a rise in temperature of the fluid.

Abstract: A system for recovering the waste heat normally exhausted into the atmosphere by chemical or other processing plants. The invented system comprises a substantially self-contained apparatus for receiving hot exhaust gases and extracting the waste heat therefrom for some beneficial use, such as pre-heating inlet air in an inlet plenum. The system may include temperature and pressure controls which enhance the safety and efficiency of the system's operation, and further may include flow controls in a multiple burner installation so that the desired fuel air ratios and heat distribution may be achieved. By building the present invention as a substantially self-contained and self-supporting assembly, on site installation time and the required alteration of pre-existing on site equipment may be minimized, thereby affecting substantial economic savings by minimizing the resulting down time of the processing plant.

Abstract: A damper assembly adapted to be affixed to an air-handling unit at an installation site including a plurality of adjacent damper assembly units adapted to be mounted with and for regulating air flow from the air-handling unit, the damper assembly unit having an interlocking structure for interlocking adjacent damper assembly units theretogether. Further, the damper assembly has a damper structure for simultaneously and independently controlling the relative mixing proportions of heated air and cooled air with ambient air for use with a multi-zone air-handling unit.

Abstract: A motor vehicle equipped with a liquid-cooled internal combustion engine. A radiator is provided, the same having first and second regions which themselves have aligned edges that form an edge of the radiator. Conduits are provided for allowing the flow of coolant through the two regions of the radiator in opposite directions. A coolant chamber extends along the edge of the radiator, this coolant chamber being divided into first and second sub-chambers by a partition which extends transversely to the edge and which defines the demarcation between the first and second regions of the radiator. The first and second sub-chambers of the coolant chamber communicate with the first and second regions of the radiator, respectively. A thermostatic valve arrangement is provided which allows the flow of coolant from the first sub-chamber to the second sub-chamber, and hence through both the first and second radiator regions, only when the temperature of the coolant is above a predetermined temperature.

Abstract: A heat exchanger has a plurality of angularly oriented and spaced cooling cores. Closure means is provided for controllably opening and closing the space between the cores for cleaning the cores.

Abstract: A uni-directional valve arrangement placed in a predetermined location between a habitable enclosure and a heating or cooling system which is exposed to outdoor temperatures prevents air of undesirable temperature in the system from passing into the enclosure by gravity flow.

Abstract: The heating and cooling system for a multiple coil installation includes a bypass passage or conduit provided with a check valve which is closed when the pump of either the heating circuit or the cooling circuit is energized and which is opened when the pumps of the heating circuit and the cooling circuit are not energized whereby a third pump which operates continuously, is effective when the check valve is open to continuously circulate the water in a closed path through the bypass circuit which is interconnected to the inlet and outlet sides of the multiple coil installation, thus bypassing the heating and cooling circuits.

Abstract: A plurality of parallel heat pipes extends between supply and exhaust ducts leading to and from an industrial or habitable enclosure. The heat pipes are mounted on, but at a fixed angular offset from, an axis about which they can be angularly rotated within the exhaust and supply ducts. Their mounting is also at an angular inclination to gravitational force to assure unidirectional operation. In this arrangement, the heat input is into the lower side of the heat pipes for proper operation. For two-season operation, rotation of the heat pipes by 180.degree. ensures that the lower side of the heat pipes will always be in the warmer duct, whether exhaust or supply. Temperature control of incoming air is obtained by slight angular rotation of the heat pipes so that a part of each air stream in the exhaust and supply ducts bypasses the heat pipes. Defrost control is also obtained by a similar slight angular rotation of the heat exchanger, although a complete 180.degree.

Abstract: A ventilating system which affords recuperative heat exchange between the supply air and the spent air and which incorporates a refrigerating machine as a heat pump which may be operated either to supplement the recuperative heat exchange or to cool the supply air without recuperative heat exchange between the supply air and the spent air. The system includes a heat exchanger in the supply-air duct and a second heat exchanger in the spent-air duct. The two heat exchangers are interconnected in a fluid circuit so that during the heating season, the fluid is heated by the spent air to warm the supply air. When the refrigerating machine is operting as a heat pump, the fluid discharged from the supply-air heat exchanger is passed through the evaporator and the fluid passing from the spent-air exchanger to the supply-air exchanger is passed through the condenser.

Abstract: Heat exchange means for use in combination with flue means conducting heated gases from a combustion zone and for extraction of thermal energy from the heated gases. A casing means is provided defining an enclosure with a central axis, and having fresh air chambers at opposed ends of the casing, and with a heat exchange chamber disposed between the fresh air chambers. Heat exchange conduits couple the opposed fresh air chambers, with the heat exchange conduits extending through the heat exchange chamber about an annular zone spaced outwardly from the central axis. A pair of baffle plates are provided within the heat exchange chamber, with the plates being arranged at opposed ends of the chamber, and with one baffle plate being movable axially. The controllable positioning of the movable baffle plate defines the axial length of the heat exchange conduits exposed to heated flue gases moving through the heat exchange chamber.

Abstract: A heat recovery apparatus in which an exhaust gas section and a fresh air section are disposed in side-by-side relationship to form an integral unit, for recovering heat from a stack or flue and discharging fresh air into a space to be heated. Heat pipe units extend from the hot gas passage of one section into the fresh air passage of the other section to transfer the heat between the two passages, the air flow in the exhaust gas section being in a series flow relationship and the flow in the fresh air section being in a parallel flow relationship. Louvers are provided for controlling the flow of exhaust gases and fresh air through the respective passages, and blowers are used to force the exhaust gases and fresh air through the passage. The passages of each section are provided with a main and by-pass passages controlled by louvers which are used to regulate the heat recovery and output of the unit.

Abstract: A corrosion resistant tubular air preheater in which combustion air is heated by heat transfer from flue gases from a furnace. The heat exchanger is of a longitudinal type having a central enclosure of rectangular cross-section in which a plurality of tubular heat transfer elements are mounted. Surrounding the central enclosure is an outer plenum. Cold combustion air enters at the bottom of the outer plenum and circulates around and up the plenum to a series of openings on top of the heat transfer elements. The partially heated combustion air then passes downwardly through metal tubes in the heat transfer elements and then passes outwardly to the furnace. The minimum temperature in metal structure enclosing the combustion gases is controlled by two means. One is the use of insulation in selected areas to limit heat transfer rate to cold air impinging upon metal surfaces.

Abstract: An air climatizing or conditioning device possessing a plurality of flaps controlling air through passages and an adjustment or positioning motor and transmission means in order to actuate such flaps in a predetermined sequence. The transmission means comprising gears as well as entrainment elements or members cooperating therewith at predetermined regions, the entrainment elements being operatively drivingly connected with the flaps so as to be non-rotatable relative to their associated flaps in a predetermined position of each entrainment element.

Abstract: A ventilation system for rotating water feeds particularly useful in water-cooled generators is equipped with bypass means arranged to extend between coaxial feed duct means and discharge duct means defining a centrally located axis of rotation. The bypass means includes at least one inlet which is located to open in the space around the axis of rotation with outlet means of the bypass means opening into the discharge duct means to vent air or gas bubbles.

Abstract: The invention pertains to air-conditioning apparatus capable of selectively heating, cooling or circulating air by the use of separate heating and cooling heat exchangers and a neutral zone selectively located within the airflow path through the apparatus. The heating and cooling heat exchangers are in the form of circular segments mounted upon support structure rotatable about an axis and separated by a neutral zone, and pivoting of the support structure about the axis selectively locates one of the heat exchangers or the neutral zone within the apparatus air inlet.

Abstract: In a multizone air control system employing constant flows of hot and cold air, the hot or cold air is variably mixed with recirculated air to provide zone temperature control.

Abstract: A heat exchange system for exchange between fluids such as water and air as in a heat recovery system in which a first fluid is passed through a first conduit which may be in the form of pipes and a second fluid such as air is passed through a second conduit that surrounds the first and including baffles for directing the second fluid in heat exchange contact flow between the spaced pipes and back into the air conduit. At least one of the baffles is shaped to be flow diverting to divert the flow of the second fluid laterally over the first conduit and back toward the center of the second conduit so as to provide an undulating flow.

Abstract: A stream of raw material is passed through a preheater to a furnace and a stream of exhaust gases from the furnace is passed through the preheater to preheat the raw material. Dust is electrostatically precipitated from the exhaust gases leaving the preheater, and the temperature of such exhaust gases is controllably raised to improve the efficiency of the dust removal by bypassing a controlled proportion of at least one of said streams around at least a portion of the preheater.

Abstract: A vertical blower coil unit for heating and cooling is provided. The unit includes a pair of parallel vertical passageways one or both of which may have a heat transfer coil means located therein for the passage of cold and hot water therethrough. Inlet damper means are provided to bypass the coil means during times when it is not desired to have air pass thereover for either cooling or heating. A collecting pan is provided beneath the coil means for catching condensate falling from the coil means when cold water is passed therethrough and to act as a water reservoir for humidifying purposes when hot water is passed through the coil means.

Abstract: A method of heating and a heating system for buildings incorporating a heat storage material that is used to store heat electrically generated during off-peak electrical power periods and to deliver heat on demand. The heat storage material is a solid halogen salt such as Na.sub.2 SO.sub.4, NaCl, CaCl.sub.2, and KCl, and mixtures of these salts incorporating a silicate binding agent. The heat storage material remains in solid form without suffering appreciable physical deterioration while being operated throughout a temperature range of room temperature to about 1200.degree.F. Generation of heat during the off-peak electrical power periods is automatically controlled.

Abstract: The arrangement of the individual air dampers with respect to the heating coils in a vertical tube face and bypass air treatment unit such that the dampers each move laterally across the coils results in a substantial reduction in the number of moving parts required to control air flow around the coils. Selective proportioning of the air flow is accomplished by splitting each damper into two sections and permanently fixing one section with respect to the coil set while allowing the other section to slide across the face of the coil set in mating relationship with the fixed section.