Abstract: A holder of a valve prosthesis implantable in a patient's circulatory system, including arms which have handles at one of their ends, and three or more working jaws provided at the end thereof for a valve prosthesis to secure thereon. The ends of all the working jaws form a circle when brought apart.

Abstract: The invention relates to apparatus for connecting a radiator to a single or double tube type hot water central heating system. The connecting apparatus includes a conventional thermostatic valve and a conventional valve controlled bypass between the inlet and outlet connectors of the connecting apparatus. A constructural feature which results in lower manufacturing costs and a lower stock inventory for thermostats involves a return passage from the radiator outlets which has a setting valve that is actuatable independently of the bypass valve.

Abstract: An air conditioning unit comprises a cooling unit and a heating unit and is provided with dehumidifying mode for drying the through-flowing air. The operation of the dehumidifier results in activation of the cooling unit compressor, which reduces the air temperature inside the vehicle. Switching circuits are provided for compensating for this reduction in temperature. The compensation in the switching circuits is dependent on the outside temperature and is ineffective if the cooling unit is running at "full cooling" when the dehumidifier is switched on, or if the outside temperature is below 0 degrees centigrade.

Abstract: A heat exchanger comprising a casing through which pass a plurality of spaced-apart tubes. Heat exchange takes place through the tube walls between a first fluid within the tubes and a second fluid outside them but within the casing. The rate of heat exchange is enhanced by electrohydrodynamic effect by means of an electrode comprising a sheet-form first part which encompasses the tubes, and connected second parts which run lengthwise through the spaces between the tubes. The first part may be mesh-like and the second parts may be mesh-like and/or rod-like. The electrode is excited to high voltage and the casing and tubes are grounded. The effect of the second parts is to make the electric field around the individual tubes more uniform than would be the case if the electrode consisted of the first part alone.

Abstract: A tank-header connection including a groove extending about the periphery of a header plate and having a bottom wall surrounded by an upstanding wall with spaced apertures therein. A compressible gasket is located in the groove and a plastic tank having an opening surrounded by a rim is provided. The rim has a series of outwardly projecting lugs and is otherwise sized and configured to fit within the groove with the lugs extending through and being captured in aligned ones of the apertures.

Abstract: A heat exchanger comprises a vertically arranged circular-cylindrical holder closed at its upper end and at its lower end, and a pipe coaxially arranged within the holder. A fin is secured to the inner pipe and consists of a plurality of interconnected lamellae extending radially from the pipe, the fin being helically wound around the pipe so that the adjacent lamellae of successive turns of the resulting helix overlap each other in part, viewed in the circumferential direction of the pipe. A capillary passage is located in each lamella above the surface of an underlying lamella in a position shifted with respect to the capillary passage of the underlying lamella.

Abstract: Air drying apparatus wherein input air to be dried is passed through an air tube which contains a smaller refrigerant tube, with precooled air from the air tube being forced by baffles to flow along a tortuous path over the exterior of the air tube. The baffles being truncated discs positioned in the shell so that alternating baffles have the truncations facing in opposite directions.

Abstract: Liquid-vapor phase separation in reservoirs for cryogenic liquid propellants in space vehicles at zero gravity conditions is achieved through a system including a unique heat exchanger. A mixed phase inlet stream is partially separated by centrifugal force imparted to the stream by swirl inducers as the stream enters the inlet of the heat exchanger. Lesser density components are provided to the interior of a spiralled tube forming part of a heat exchanger to be condensed therein by the higher density components which are applied to such tube within the heat exchanger. Heat transfer efficiency is maximized by making the tube of rectangular cross section and providing liquid impingement jets active on three sides of the tube and by providing a baffle which forces the heat transfer fluid to further cool the tube by convection on the remaining side thereof.

Abstract: A tube-and shell double-pipe or liquid-air fin type heat exchanger, which offers a high level of thermal energy transfer efficiency, incorporates a rotary blade to disrupt a fluid film on surfaces of each tube, and is of uncomplicated design and construction. The blade is free-floating and operates regardless of the direction of flow of the liquid through the tubes.

Abstract: A plurality of heat radiating passages are juxtaposed to each other. A fluid distributing chamber and a fluid collecting chamber are disposed at respective opposite ends of the radiating passages in communication therewith. The heat radiating passages each having a substantially U-shaped configuration and extending in the same directions with each other so that the fluid distributing chamber and the fluid collecting chamber are closely juxtaposed to each other.

Abstract: Apparatus for heating and cooling a steering wheel includes a skin layer coupled to the outside surface of the steering wheel, a heat conductive plate coupled to an inside surface of the skin layer, a thermal storage core extending along a central portion of the steering wheel, and at least one thermoelectric transducer thermally coupled between the heat conductive plate and the thermal storage core. The thermoelectric transducer either generates heat or absorbs heat in accordance with the direction of a current flowing through the transducer. When the steering wheel is hot, current is caused to flow through the transducer in a first direction so that the transducer absorbs heat. The transducer absorbs the heat from the heat conductive plate and passes it to the thermal storage core. In turn, the heat conductive plate absorbs the heat on the skin layer of the steering wheel, thus cooling the steering wheel.

Abstract: In a nuclear steam generating vessel, a baffle plate disposed a slight distance above the tube sheet has a plurality of openings therethrough for respectively receiving the heat exchanger tubes. Each opening has a circular central portion and eight equally spaced peripheral lobe portions alternating with eight lands. The inner end of the lands lie on a circle have a diameter slightly greater than that of the associated tube. The upper and/or lower surface of the baffle plate is mechanically deformed adjacent to each lobe portion of each opening to displace material into the lobe portions and constrict the cross sectional areas thereof to limit liquid flow therethrough. The lands are dimensioned and arranged so that one or two at a time can contact the associated tube, while the constriction of the lobe portion flow areas limits liquid flow therethrough sufficiently to insure proper baffling operation of the baffle plate.

Abstract: A zoned HVAC system for a building is provided with three control zones: an internal zone (14), a perimeter zone (16) and a skin zone (18). The internal zone (14) provides cooling of internal heating loads from equipment and personnel as determined from internal zone (14) thermostats (43, 46, 48). Perimeter zone (16) provides cooling against interior and solar heating loads, with thermostats (51, 52, 53, 54) controlling associated sectors dampers (56, 57, 58, 59). The skin zone (18) provides both heating and cooling against thermal transmissions through the building exterior (10). Each skin zone sector (30, 31) is assigned to a plurality of perimeter zones (24, 25, 26, 27). Operation of a skin zone sector (e.g. 30) is effected by a control box (e.g. 64) receiving inputs from perimeter zone thermostats (e.g. 51, 52) with a control output functionally related to the perimeter zone sector with the lowest cooling demand.

Abstract: The invention concerns a device for the cooling of hot gaseous solids suspensions, particularly for the cooling of hot gaseous TiO.sub.2 suspensions resulting from the production of titanium dioxide by vapor phase oxidation of titanium tetrachloride. The device consists of a number of coaxially connected constructional units, each of which consists of three jacketed tubes, i.e., tubes 1, 2 and 3, which are coaxially connected in such a way that tube 1 conically tapers toward tube 2 and that tube 3 is larger in diameter than tube 2. Heat transfer is twice as high in the device of the invention as in a comparable conventional cooling tube of uniform inner diameter; moreover, the demand of scrub solids needed to prevent the formation of deposits on its walls is reduced to one third of the quantity needed in a conventional cooling tube.

Abstract: A clock operated thermostat having both automatic heat-cool changeover and optimum start is disclosed. Programs for the optimum start and automatic changeover are incorporated in a microcomputer based clock thermostat and eliminate any possibility that a homeowner can inadvertently program a sequence that would cause a conflict between the heating and cooling equipment.

Abstract: An intercooler includes a first heat exchanger into which liquid coolant is sprayed and subsequently converted to vapor via the absorption of its latent heat of vaporization. The vapor is condensed in a radiator under the influence of a fan. The condensate is pumped back to the first heat heat exchanger via an thermostatically controlled expansion valve. When the intercooler is not in use it is filled with liquid coolant to prevent the intrusion of contaminating air. Excess coolant may be forced into the system when cold to purge out any non-condensible matter.

Abstract: A testing chuck for providing a thermally controlled mounting for wafer scale integrated circuits includes a body having a flat upper surface, upon which the integrated circuit is mounted, cooled or heated by a fluid flowing through a number of channels formed in the body. The channels have entrance and exit ends fluidly connected to first entrance and exit plenums. Second entrance and exit plenums are connected to the first entrance and exit plenums by a number of entrance and exit distribution conduits. Fluid is pumped into the second entrance plenum, through the entrance distribution conduits, through the first entrance plenum and into the entrance ends of the channels. After passing through the channels, the fluid flows through the first exit plenum, exit distribution conduits and second exit plenum. The entrance and exit plenums are curved in the direction of fluid flow to reduce stagnant regions within the plenums to aid heat transfer and draining of the chuck.

Abstract: In order to cool heat generating components on an electronic assembly without contamination by particles carried in a cooling gas stream, a cold plate is disposed adjacent the assembly, defining a gap region therebetween. The cooling gas is directed in proximity to the cold plate, dissipating heat transferred from the components to the plate. To enhance overall heat dissipation of the apparatus, an aperture is defined between the gap region and the gas stream, so that a negative pressure is induced in the gap by virtue of the Bernoulli principle. This pressure difference induces convection within the gap, increasing heat flow between the components and the plate, and resulting in overall improvement in heat dissipation. Embodiments in which the gas stream flow is parallel and transverse to the cold plate are described.

Abstract: A recuperative heat exchanger for gas-gas heat exchange at a temperature above 700.degree. C., comprising a refractory lined vessel having a vertically extending steel shell closed at top and bottom by respective ends, wherein the space within the vessel is divided into respective top and bottom end chambers and a heat-exchange chamber therebetween by top and bottom apertured refractory plates and the end chambers are connected by a plurality of substantially vertical tubes of refractory ceramic material extending between said plates.

Abstract: A header of plastic material for a heat exchanger of the tube type has two identical faces provided with projecting ribs. The internal partition-wall of a water box is fitted between the ribs of one header face while the ribs of the other face are applied against an end fin of the tube bank.