Abstract:
A heat exchanger includes a tube with a heat-exchange passage and an end piece. The heat-exchange passage directs the flow of a first medium and includes a first flow section and a second flow section arranged in parallel. The end piece has a tube plate that includes a base plate, a diverter plate, and a cover plate. An end of the tube connects to the base plate. The diverter plate has a cutout that forms a diverter passage. The cover plate lies adjacent to the diverter plate and covers the diverter passage in a fluid-tight manner. A second medium flows exterior to the heat-exchange passage.
Abstract:
The invention relates to a collector tube (1) for a heat transfer unit. The tube comprises one or several slits (3d) on the periphery thereof, whereby said slits are formed by a punch press without an inner die or by high-pressure shaping for inserting a respective flat tube. The invention also relates to a method for producing said collector tube (1). According to the invention, a collector tube (1) is provided with an outer radius (D/2) to tube wall thickness (s) ratio of less than 5. The slits (3d) are introduced preferably parallel to, or at an acute 2 angle to the longitudinal axis of the tube. The collection tube can be produced by bending a flat material and subsequently sealing the longitudinal slits arising from the bending process by soldering or welding. Said collector tube can be used, e.g. for gas coolers and evaporators for CO2 air conditioning systems in motor vehicles.
Abstract:
The invention relates to a device for exchanging heat, especially for using in motor vehicle air-conditioning installations comprising at least one distribution or collection chamber for a fluid, at least one flow device which is provided with at least one first flow connection section on the end thereof, and at least one second flow connection section on the end thereof, the first flow connection section being connected to the second flow connection section by means of at least one pipe section. According to the invention, at least one of the flow connection sections is twisted at least once, one flow connection section is connected to the collection chamber, and the other flow connection section is connected to the distribution chamber.
Abstract:
The invention relates to a device for exchanging heat, particularly for use in motor-vehicle air-conditioning systems, comprising at least one coolant, at least one collant inlet (3), and at least one coolant outlet (4), which lead into one head pipe (7, 8, 9), whereby the head pipe (7, 8, 9) is divided into at least one inlet section (41′) and into at least one outlet section (42′) by at least one separating element (40). The device for exchanging heat comprises at least one flow-through element (19), which has at least two flow paths situated at least partially parallel to one another, and at least one cross-distrubitor (10′, 10″, 11′, 11″, 12) via which the flow paths of the flow-through element (19) are fluid-connected so that the inlet section is fluid-connected to the outlet section of the head pipe (7, 8, 9).
Abstract:
A flat tube for use in a heat exchanger includes a reversal bend section connected between parallel extending tube sections. The reversal bend section extends from a plane of the tube sections by a distance less than a width of the tube sections. The tube sections can be straight or serpentine. A plurality of the flat tubes can be stacked and connected to collector tubes to form a heat exchanger for use as an evaporator in a vehicle air conditioning system. Corrugated ribs are positioned between adjacent flat tubes for increased heat conduction.
Abstract:
A heat exchanger block includes a plurality of block units, located one behind the other, each having a plurality of stacked tube units with tube ducts extending transverse to the block depth and height. The tube ducts are connected at ends to associated collector ducts extending in the block height direction. The tube units can be formed from a multichamber flat tube. At least one collector-duct connection is provided between adjacent block units to form a meandering flow path through the heat exchanger block. The heat exchanger block can be used as an evaporator in a motor vehicle air-conditioning system.
Abstract:
An expansion element for a CO2 motor vehicle air conditioner includes a valve unit which can be used particularly for such an expansion element and which has a fixed throttle between an upstream valve high-pressure side and a downstream valve low-pressure side. The expansion element contains a control valve which is acted upon by the low-pressure-side refrigerant pressure or a physical quantity connected therewith as the correcting variable, or valve unit. The valve unit contains a fixed throttle and at least one additional valve component in the form of a pressure control valve which is arranged in a bypass line bypassing the fixed throttle, or in the form of a control vale influencing the passage cross-section of the fixed throttle.
Abstract:
In a condenser for an air-conditioning system, in particular for an air-conditioning system of a motor vehicle, there is provision for a collector (15) to be formed from a plurality of series-connected tubes (18) which extend between header tubes (10, 11) and the cross section of which is a multiple of the cross section of the flat tubes (13).
Abstract:
A multichannel flat tube for a heat exchanger has a plurality of parallel flow channels aligned in a row, side by side, along a transverse axis of the tube. At least the inner flow channels have oval cross-sections, and major semiaxes of the inner flow channels are inclined relative to the transverse axis of the tube at an acute angle. The flat tube can be designed for high operating pressures with relatively low weight and relatively high heat exchange capability. The construction may be used, for example, in CO2 air conditioners in motor vehicles.
Abstract:
An intake plenum unit is provided for a heat exchanger with a tube block made of a plurality of heat exchanger tubes. The heat exchanger incorporates an intake plenum with a tube wall in which a lengthwise slot is provided for receiving ends of the heat exchanger tubes. The intake plenum is made of one or more individual tubes inserted into one another endwise or fitted together. Each intake plenum has, at least at one individual tube end, a lengthwise slot that is open and made before or after the construction of the intake plenum. This allows problem-free compensation for manufacturing tolerances of the tube ends to be fitted into the lengthwise slot regarding their length in the direction of the lengthwise slot. The intake plenum unit is suitable for use, for example, for gas coolers and evaporators of carbon-dioxide air conditioners.