Abstract: Various heat exchange apparatuses are described in which an oscillating flow of primary coolant is used to dissipate an incident heat flux. The oscillating flow may be imparted by a reciprocating piston, a double action twin reciprocating piston, fluidic oscillators or electromagnetic pumps. The oscillating fluid flows through at least one conduit in either an open loop or a closed loop. A second flow of coolant may be used to flow over the outer walls of at least one conduit to remove heat transferred from the primary coolant to the walls of the conduit.

Abstract: A pin-fin type heat exchanger comprising a plurality of wire-like heat conductive elements arranged in parallel and spaced from each other, and formed into a corrugated shape, and a method of manufacturing the same by making a corrugated sheet including the wire-like heat conductive elements and a temporary fixing material and removing the temporary fixing material after the heat conductive element is joined to a pipe through which fluid passes.

Abstract: A multi-flow tubular heat exchanger is enclosed. The heat exchanger includes a shell that encloses one or more cooling stream tubes, one or more heating stream tubes, and a heat transfer fluid.

Abstract: A hybrid capillary/mechanical two-phase thermal loop has a sensor connected in parallel with a number of evaporators to regulate the flowrate of a booster pump providing working fluid to the evaporator capillaries. This sensor is made of a coiled, conductive tube connected in parallel with the evaporators, with an inside diameter substantially greater than the inside diameters of the evaporator capillaries. A conductive wire extends within said tube, but is insulated from electrical contact with the tube. The working fluid contained within the tube acts as a dielectric between the tube and wire. The amount of liquid phase working fluid within the tube can be determined by measuring the electrical capacitance between the tube and wire. The flowrate of the booster pump is then regulated as a function of the measured capacitance to maintain a substantially constant amount of liquid phase working fluid within the sensor tube.

Abstract: A heat pipe system is provided in which the working fluid is selected to enhance operation of the heat pipe by utilizing a salt compound having a boiling point of about 600.degree. K. at one atmosphere.

Abstract: Perforated plate heat exchangers and cryocoolers based on plates with extremely small, tubular holes are disclosed. The plates may have hole diameters down to the low micron size range and length-to-diameter ratios above unity and from 2 to 6 for typical applications. Such perforated plates function as tubes rather than screens and provide high efficiency, especially for compact cryocooler applications. The plates, which are made of a high thermal conductivity metal, and alternating spacers of low thermal conductivity material are disposed in an elongated stacked array of a large number of units such as 100. For use in a recuperative heat exchanger for a cryocooler employing the Linde-Hampson cycle, webs at the plate and spacer edges and a strip across the middle define two flow chambers, one for gas flow in each direction. One end of the array communicates with a high-pressure gas inlet for introducing gas in one chamber and a low-pressure gas outlet for removing gas from the other chamber.

Abstract: There is disclosed an apparatus for burning a waste gaseous stream having a residual heating value represented by a heat of combustion of from 50 to 900 BTU/SCF. to heat an intermediate heat transfer fluid, and to use the thus heated heat transfer fluid to heat diverse fluids in a plurality of serially arrayed heat exchangers at descending temperature levels.

Abstract: An evaporation heat exchanger having at least one active circulating circuit for a coolant liquid to be cooled, is constructed for removing heat in a spacecraft under a gravity-free operating condition and under different acceleration conditions. For this purpose, a housing encloses an evaporating space provided with at least one inlet valve for controlling the admission of a medium to be evaporated. The produced vapor or steam is discharged through a respective port. A plurality of cooling tubes interconnected in a meandering shape form a number of tube panels in which the individual tubes are arranged in a zig-zagging pattern to form respective flow passages for the medium to be evaporated. The individual tubes extend in parallel to each other and perpendicularly to the flow direction of the medium to be evaporated, while the meandering configuration is forming the zig-zag pattern.

Abstract: A method and apparatus for maintaining an electrically operating device at a desired temperature during burn-in testing of the device includes immersing the device in a bath of an inert liquid having a boiling point less than the desired case temperature. The device generates heat during electrical operation which is transferred to the bath by nucleate boiling of the liquid. The device temperature is monitored until it stabilizes at a temperature between the boiling point of the liquid and the desired device temperature. An inert liquid having a boiling point greater than the desired device temperature is slowly added to the bath to modify the rate of nucleate boiling of the lower-boiling liquid, while the device temperature is simultaneously monitored, until the case temperature reaches the desired device temperature.

Abstract: A heat exchanger according to the present invention comprises a housing for containing an upper and a lower layer of fluid, means for preventing intermixing of the two fluids, and heat transfer means for enhancing the transfer of heat between the layers. Specifically, the heat exchanger means is in form of a plurality of elongated cylinders extending into both layers, each of said cylinders containing a convective fluid. Preferably, the convective fluid is a liquid; and the preferred liquid includes water. Where the fluid in each of said upper and lower layers is a gas, the preferred orientation of the cylinders is vertical. The hotter fluid should be beneath the cooler fluid so that heat from the hotter fluid is first transferred to the liquid in the lower ends of each cylinder. The buoyancy of the heated liquid sets up convection currents which carry the heated liquid upwardly in the vertical cylinders where the heat is given up to the cooler fluid.

Abstract: The apparatus and method for flushing and draining the radiator and cooling system of a vehicle employs a drain pipe which allows for draining of the radiator and flushing of the cooling system. A drain pipe which connects to the bottom of the radiator has a bend of 180.degree. near the top of the radiator but below the fluid level of the radiator. The outlet of the drain pipe is below the inlet for the drain pipe.

Abstract: An air/liquid heat exchanger for aircraft having ram pressure powered evaporative cooling.

Abstract: An automotive air conditioning system condenser is disclosed. The condenser includes a plurality of tubes having opposite first and second open ends, and a plurality of fin units disposed between the plurality of tubes. First and second header pipes are fixedly disposed at the opposite ends respectively, and the open ends of the tubes are disposed in fluid communication with the interior of the header pipes. The first header pipe has an inlet which links the condenser to an external element of the circuit. The first header pipe also has an outlet which links the condenser to an external element of the circuit. Partitions are provided in the header pipes to create isolated chambers therein. The partition comprises a horizontal portion with a peripheral portion extending perpendicularly to the horizontal portion. The partition is inserted into the header pipe through an open end.

Abstract: A hot spot detection system (78) at one location that is fixed with respect to the rotor (12), and a temperature suppression system (62) at another location that is fixed with respect to the rotor. The suppression system is automatically energized by the hot spot detection system when a threshold temperature is detected. Preferably, the suppression system includes one or more pipes (66) that span the radial dimension of the heating element compartments in the rotor. The detection system can be in the conventional location, on the trailing edge (40) of the air inlet duct (32) of the air preheater. The suppression piping (66) is preferably located in the hot end, or air discharge duct (34), of the air preheater. Depending on the location of the suppression piping with respect to rotor rotation, a timing device (100) is preferably employed to start and stop the flow of suppression water into the rotor, just prior to and after the hot spot passes under the piping.

Abstract: A metallic assembly transfers heat from a hot surface in contact with a heat source to specially shaped air passageways where cooling air is blown through. The air passageways in the metal assembly are arranged with a large metal surface area in contact with the cooling air for efficient heat transfer with low resistance to air flow. The passageways are formed by stacks of streamlined posts alternating with fins. The alternating layers are formed separately, stacked together, compressed, and subjected to hot dip brazing. This melts a low melting layer of cladding metal between metal layers to form the assembly into an integral assembly with efficient heat transfer between layers with reduced manufacturing costs.

Abstract: In a room air conditioner, at least the condenser, and preferably both the compressor and the condenser, are separated from the main body of the air conditioning apparatus, and are mounted in an exteriorly facing wall, outside the room which is to be cooled. The main body of the air conditioning apparatus is connected with compressor and condensor mounted in the wall by connecting piping and fittings and is mounted on the wall by a hanging bracket and position-fixing spacer bracket.

Abstract: A seal for a gap between two components which are displaceable relative to each other through limited distances in three spatial directions, the seal being formed by at least two partially overlapping corrugated, bellows-like seal elements which are arranged one after the other in the longitudinal direction of the gap. Each seal element is connected to one of the components at a fixed point of attachment and is slidably and guidably connected to both components. Adjacent seal elements can also be slidably and guidably connected to one another. The seal provides sealing action for comparatively large relative movements of the two components and, thus for greatly varying widths and shapes of the gap.

Abstract: A combination pump and heat exchanger assembly uses a cast metal pump case with two upwardly opening sockets receiving the lower ends of two tubes, one of them communicating through the case with the pump impeller intake and the other with the impeller discharge. The tubes are constructed to function as heat exchanger units and are removably secured to the case by threaded fasteners and are sealed therein by compression seals. The heat exchanger tubes may employ electrical heating units or chilled liquid piping units therein.

Abstract: In the case of a latent heat storage means having a storage medium consisting of or including barium hydroxide octahydrate at least the parts of the heat storage means exposed to the action barium hydroxide octahydrate consist of oxygen-free copper or an alloy thereof with one or more elements selected from the following group: nickel, chromium and phosphorus.

Abstract: A heat storage means, and more particularly to a latent heat storage means for motor vehicle heating systems supplied by engine waste heat, comprises an inner container (10) with a storage core within it, an outer container (12) surrounding the inner container with a clearance with the formation of a preferably evacuated insulating space (14) and two ducts (16 and 18) extending through the insulating space (14), of which one duct serves as a supply duct and of which the other serves as a return duct for a heat vehicle fluid and both are arranged adjacent to the insulating space (14) in such a manner that they have a straight section (16b and 18b) which is as long as possible. The cross section of such duct sections has such a dense arrangement of permanently fitted elements running in the direction of flow that the periphery contacted by the fluid is, in comparison with the flow cross section, so large that convection is substantially prevented.