Abstract: A recuperative or restorative spiral heat exchanger with separating walls spirally extending between fluid streams of medium having an exploitable temperature gradient. Each two adjacent separating walls enclose between themselves a flow duct for one of the two streams of medium and the spiral space between two flow ducts forms the path of flow for the other stream of medium. The spiral is provided in the form of a multiple or multi-channel spiral by arranging a plurality of flow ducts. In particular, the spiral heat exchanger consists of two multiple spirals with opposed directions of current.

Abstract: A disposable lancet assembly is provided, including a housing serving as a lance-holder guide, a lance holder body reciprocable in the housing guide, and a flat-bladed lance mounted in one end of the lance holder body. Included in the invention are integral strategically positioned abutments which serve dual functions providing snap-action drive for the lancet, together with steps for lance movement control. Also included are integral resilient means on the lance holder body providing damping of the lance drive in the puncture direction with automatic withdrawal of the lance into the housing.

Abstract: An apparatus for heating and cooling which features a unique energy recovery ventilation apparatus and method. During energy recovery ventilation, a cycling damper controls the flow of warm and cool air to maintain the inside air temperature when inside air is cycled to the outside. The outside air is then warmed or cooled when drawn to the inside.

Abstract: A water/air cooler is provided for water cooled internal combustion engines, especially for use in vehicles, which is constructed out of a cooler block held between water tanks and lateral parts. The lateral parts are connected with the water tanks by means of laterally overextending and gripping fastening brackets. These fastening brackets exhibit openings for engaging protruding connecting bolts on the water tanks. The brackets are affixed to the connecting bolts either through spring clamps or through corresponding protrusions having elastic clamping devices themselves. This water/air cooler is very easily assembled and is especially adapted for systems wherein the water tanks are manufactured out of plastic material.

Abstract: The present invention relates to a heat exchanger assembly having a plurality of heat exchange fluid passageways formed from a modified copper-zinc alloy. The copper-zinc alloy contains from about 21% to about 39% zinc, from about 1% to about 5% nickel, from about 0.02% to about 1% arsenic and the balance essentially copper. In a preferred embodiment, the copper-zinc alloy consists essentially of from about 25% to about 35% zinc, from about 2.5% to about 3.5% nickel, from about 0.03% to about 0.06% arsenic and the balance essentially copper. The heat exchanger assemblies of the present invention have particular utility as motor vehicle radiators.

Abstract: A variable speed integrator for controlling the response time of a valve which regulates the amount of coolant flowing to a heat exchanger so as to control the temperature of the cooled substance output from the exchanger. The temperature of the cooled substance is sensed and compared to a set point temperature to determine an error temperature representing the difference between the sensed and set point temperatures. The error temperature is integrated by the variable speed integrator, the output of which is used to drive the valve into position. The control system monitors the rate of change of the sensed temperature to determine a low system gain. When the rate of temperature change indicates a low gain system, the gain of the integrator is increased to decrease the response time of the valve.

Abstract: A coil tube bundle for a heat exchanger wherein substantially rigid strips are formed with substantially equally spaced slots inwardly along a front edge thereof with each slot defining a seat opening through a narrower funnel throat, and flexible tubes of resilient circular cross section disposed across aligned rows of said strips and embraced within the seats of the slots to form an interconnected grid of rigid strips and flexible tubes, the grid being coiled to a bundle with the strips parallel to a central axis and the tubes forming spirals with convolutions contacting and spaced apart by edges of the strips opposite the slotted front edges and with the tubes supported at substantially equally intervals throughout their lengths, the plastic material of the tubes and strips being non-brittle at water-freezing temperatures. The strips and tubes are preferably of slippery plastic which is non-brittle at water-freezing temperatures.

Abstract: A light source unit for an exposure unit is provided. The unit comprises a cylindrical light-emitting tube and a screen sleeve which has a slit in the circumferential direction and with which the tube is covered through water filled therebetween. According to the invention, the light source unit has the two opposite edges of the slit in the screen sleeve that are in the axial direction partly extended downward to the outer periphery of the light-emitting tube so that a flat exposure pattern is obtained that is small in the radial direction at the periphery of the surface to be exposed to light. Further, a more favorable effect can be obtained by the provision of an attenuating filter on the outer periphery of the screen sleeve for the purpose of shielding a part of the light from the light source in the axial direction.

Abstract: The present invention relates to a device for protecting heat exchangers placed in a duct (1) for smoke filled with fine particles of ash, e.g. coming from a pulverized coal boiler. The heat exchangers are constituted by parallel grids (10) each comprising a main region (A) fitted with rectilinear lengths (11) of tube extending perpendicularly to the direction of smoke movement, and two end regions (B) fitted with bends (12) and rectilinear lengths (13) of tube extending parallel to the direction of smoke movement. The protective device is constituted by parallel panels (20) which are parallel to the grids (10) of tubes, with each panel (20) being placed between two grids (10) and at each end region (B).

Abstract: An environmental control system having an ozone decomposition catalyst coating in the hot pass side of the primary heat exchanger. The environmental control system includes primary and secondary heat exchangers as well as a rotary compressor and a rotary turbine expander. The environmental control system is used in aircraft for providing conditioned air to the habitable space of the aircraft for life support purposes.

Abstract: Improvements in heating and cooling systems which are steam powered, the (winter) heating system utilizing a steam/liquid heat exchanger and the (summer) cooling system utilizing a steam powered absorption machine; methods of and apparatus for substantially improving a steam powered heating system conventionally having a boiler, a heat source for the boiler, a steam/liquid heat exchanger, a steam trap for the heat exchanger, a condensate tank with a vent line to atmosphere and work to be heated; methods of and apparatus for substantially improving a steam powered cooling system conventionally having a boiler, a heat source for said boiler an absorption machine having a generator section and an absorption section, a steam trap for the generator section of the absorption machine, a condensate tank with a vent line to atmosphere and work to be heated; methods of and apparatus for markedly increasing energy efficiency and efficient functional capacity in the heating and/or cooling systems in question.

Abstract: An air conditioner system for vehicles which includes at least two connecting passages interconnecting a main duct of the front-seat air conditioner unit and an air mix chamber in a duct of the rear-seat blower unit. Air mix doors are disposed in the connecting passages to adjust the amount of air introduced from the main duct through the respective connecting passages to the air mix chamber. One of the connecting passages has an inlet opening to the main duct between an evaporator and a heater core disposed in the main duct whereas the other connecting passage has an inlet opening to the main duct downstream of the heater core. Thus the amount and temperature of the air blown into a rear-seat part of the passenger compartment can be controlled independently of the temperature and the amount of the air blown into the front-seat part. With the connecting passages thus arranged, the main duct is simple in structure and hence can be manufactured more economically.

Abstract: A plate heat exchanger comprises a plurality of heat exchanger plates made from sheet metal. Each plate has a center part which is used for heat exchange and is provided with a plurality of parallel wavelike impressions. The wavelike impressions being arranged in a plurality of circular wave fields that cover substantially the center part of the plate.

Abstract: A heat exchanger (10) for indirectly heating, drying and cooling materials comprises a hollow rotor (40) having an inlet (46) of heating and cooling medium and an outlet (47) of the medium or its condensate, a casing mounted on the hollow rotor, a plurality of disc-shaped base boards (20), a plurality of annular ducts (21, 23; 22, 24) projected from both side surfaces (11, 12) of the base boards (20), the duct forming a passage communicating with the inlet (46) and the outlet (47), arranged so as to be partly superposed sequentially on both front and back surfaces (11, 12) of the base board (20) from the inner peripheral edges to the outer peripheral edges of the base boards (20) in such a manner that partition plates for shielding the ducts (21, 23; 22, 24) being provided in the superposed positions.

Abstract: Improved heat transfer tube and method of making same has mechanical enhancements which can individually improve either the inner or outer surfaces or which can cooperate to increase the overall efficiency of the tube. The internal enhancement, which is useful on either boiling or condensing tubes, comprises a plurality of closely spaced helical ridges which provide increased surface area and are positioned at an angle which gives them a tendency to swirl the liquid. The external enhancement, which is applicable to boiling tubes, is provided by successive cross-grooving and rolling operations performed after finning. The finning operation, in a preferred embodiment for nucleate boiling, produces fins while the cross-grooving and rolling operation deforms the tips of the fins and causes the surface of the tube to have the general appearance of a grid of generally rectangular flattened blocks which are wider than the fins and separated by narrow openings between the fins and narrow grooves normal thereto.

Abstract: A multiplicity of parallel heat transfer tubes each sealed with refrigerant are journaled for rotation at each end and in a bulkhead that separates the air flow channel in a counterflow heat exchanger into ingoing and outgoing parallel channels. Each heat transfer element has closely spaced circular fins extending radially outward from each tube, the spacing between adjacent fins being less than the fin radius. A motor and transmission cause each heat transfer element to rotate about its longitudinal axis.

Abstract: A heat-transfer tube with a grooved inner surface adapted to phase-transition for fluid flowing inside the tube disposed in a heat exchanger is disclosed. This tube can achieve the reduction in the weight per unit length, improvements in workability and characteristics of the tube by limiting the cross-sectional area of respective grooved section and the shape of the ridge defining the grooved section.

Abstract: A condenser is provided with a heat exchanger which is rotated in an airtight cylindrical vessel filled with a fluid to be condensed. The rotated heat exchanger has a structure almost similar to a rotor of a steam turbine, namely, has a structure formed of plural pairs of hollow blades arranged individually opposite to each other on both sidewalls of an elongated rectangular hollow axle rotated in the fluid to be condensed, all of those hollows being communicated with each other, so as to circulate a coolant therethrough. As a result, the fluid to be condensed always uniformly contacts with the coolant through surfaces of the blades with an extremely high performance of condensation.

Abstract: Surgical apparatus for use in contouring medical implants comprises a transparent enclosure adapted to be located on a metallic work surface in an operating theater, the enclosure being sized to enable manipulation of an implant therein by a surgeon for contouring, a stand connected to the enclosure for adjustably positioning and fixing a surgical drill in a preselected orientation with respect to the work surface such that the drill bit projects throughout an opening into the interior of the enclosure, the stand carrying a magnetic mechanism so as to enable the stand to be immobilized with respect to the work surface, and a movable cutting block having a disposable cutting surface thereon. The stand is connected to the enclosure by a metal tongue, slidably carried by the stand, which is received within a slot on the underside of the enclosure, and the cutting block is formed with a magnetic mechanism so as to enable immobilization of the cutting block with respect to the tongue.

Abstract: A hot fluid generator is disclosed for exchanging heat between a first fluid having a first temperature and a second fluid having a second temperature. The generator includes at least two spaced parallel metal sheets spirally wound with spaced turns about a vertical central axis and joined at their top and bottom edges to define a hollow spiral wall. Upper and lower closure members arranged normal to the central axis are connected with opposite ends of the spiral wall to define a first spiral passage between successive spaced turns through which a first fluid is circulated and a second spiral passage between the spaced sheets through which a second fluid is circulated, and a central combustion chamber. A burner is centrally arranged within the combustion chamber to heat the chamber and the first fluid so that as the first and second fluids are circulated, heat is exchanged between the first and second fluids.