Abstract: An apparatus and method of circulating a heat-absorbing material within a heat exchanger is disclosed. The apparatus comprises a manifold layer coupled to an interface layer. The manifold layer comprises an inlet manifold and an outlet manifold. The interface layer comprises a plurality of channels that extend from the inlet manifold, toward a heat-exchanging plane, and turn away from the heat-exchanging plane, terminating at the outlet manifold. The plurality of channels are stacked in a plane non-parallel to the heat-exchanging plane. Each of the channels is adjacent to another, thus allowing heat radiated from a heat-generating device to be conducted to a cooling material circulating within the channels, away from the heat-generating device. Preferably, each of the channels has a U-shape or an elongated U-shape.

Abstract: The invention provides an air mixing damper apparatus and an air conditioning apparatus for vehicles where the temperature of discharged air can be changed linearly with respect to the operation of an actuator lever. A rotation speed adjustment mechanism is disposed between a plate door type air mixing damper 43A for opening and closing an air introducing face 42a of a heater core 42, and a rotation type lever 48 for an actuator 47 driving the air mixing damper 43A, for adjusting the rotation speed at an initial opening stage X and a final opening stage Z of the air mixing damper 43A, to a speed lower than at an intermediate opening stage Y.

Abstract: An air handling system including at least one terminal unit for maintaining a serviced volume at a predetermined temperature below the temperature of the air supplied by the central source of the air handling system is provided through the use of a refrigerant means in the form of a passive thermal energy recovery device which provides heat transfer between the outgoing and inflowing air streams provided by the a central air handling system. The heat transfer between air streams is regulated as a function of air velocity and temperature differentials as measured at various points in system which are related specifically to the serviced volume. Environmental control within the serviced volume is exercised by controlling face and bypass dampers to regulate the air flow through the passive heat exchanger and the air exchange rate is controlled by modulating the operation of the dampers or by regulating the air flow into or out of the serviced volume by way of supply and/or exhaust louvers.

Abstract: Providing a multi-tube heat exchanger capable of increasing heat exchanging performance without increasing its heat transmitting area and solving a problem on drop in heat exchanging efficiency due to adhering pollutant or the like. A multi-tube heat exchanger comprising an inner tube (heat transmitting tube) group in which a first fluid passes and an outer tube (body) in which a second fluid passes, both ends of each multiple heat transmitting tubes being held and disposed on introduction/discharge side holding plates located on each of first fluid introduction side and first fluid discharge side. The heat transmitting tube is constituted of only a heat transmitting tube main body 114 and a number of lump-like projections are formed at a predetermined interval in the length direction on one or both of opposing wall faces on longer sides of the heat transmitting tube main body 114.

Abstract: A U flow radiator 10 with a header tank 12 split into inlet and outlet sides I and O by a lengthwise divider wall 18 has a coolant inlet consisting of a cylindrical pipe 22. A hollow cylindrical barrel 24 co extensive and coaxial with pipe 22 and extending across divider wall 18, with cut outs 26 and 28 opening respectively into both sides I and O. A thin walled, hollow cylindrical sleeve 30 turns within barrel 24 with windows 36 and 38 that alternately block or open the cut outs 26 and 28, or open both partially. A rotary actuator 40 turns sleeve 30 within barrel 24. Coolant can be selectively routed all to the tank outlet side O, by passing the radiator 10 for quick warm up. After warm up, coolant can be routed to I or O in desired proportions to increase or decrease cooling capacity. With high engine cooling demand, all coolant is routed to the inlet side I and all coolant passes through radiator 10.

Abstract: A heating, ventilating, and air conditioning (HVAC) assembly having a housing defining first and second quadrants. An air mixing door is mounted to the housing downstream of an inlet and upstream of an outlet. The air mixing door has a first position directing substantially all of the air through the first quadrant, a second position directing substantially all of the air through the second quadrant, and a third position directing a flow of air through both of the first and second quadrants. A first seal is mounted to a first side of the air mixing door and a second seal is mounted to a second side of the air mixing door. A diffuser is mounted to at least one of the sides of the air mixing door and has a plurality of passageways to interrupt a flow of air passing around the air mixing door when the air mixing door initially moves from one of the first and second positions to the third position, thereby controlling an initial flow of air into at least one of the quadrants.

Abstract: A vehicle air conditioning system secures an appropriate temperature difference in the air blown through vertically arranged air ducts when the system is in a bi-level mode. A hot air inlet is disposed above a cool air inlet. A face opening is disposed at an upper location while foot openings are disposed at a lower location. A blow mode-changing door for opening and closing both the openings is a butterfly type door. The blow mode-changing door is pivotally disposed in a door housing. In the bi-level mode in which the blow mode-changing door opens both the foot openings and the face opening, a bi-level mode bypass passageway for introducing cool air from the cool air inlet into the face opening is defined between an extremity of the blow mode-changing door and the inner wall surface of the door-housing portion.

Abstract: Method and apparatus for heating gases cooled by an aftercooler that receives hot gases from a compressor. The method includes the steps of directing at least a portion of said hot gases to means for bypassing the aftercooler, and using the bypass means to direct hot gases to a location that receives cooled gases from the aftercooler. The hot gases are used at the location to heat the cooled gases when ambient temperature is at or below freezing, and are used downstream from the aftercooler when moisture freezes in the aftercooler.

Abstract: A coil modulator apparatus for use in connection with heat transfer coil assemblies found in commercial heating and air conditioning units is used to limit the number of active tube sections in cooling coil assemblies. The two port modulator apparatus comprises an inner valve, having valve ports in the sides of the valve, that rotates within an outer housing having openings that correspond to those ports in the inner valve. Apertures in the outer housing connect with upstream and downstream tube sections in the bank of tubes. As the actuator arm of the coil assembly is rotated this rotates one of the valves changing the orientation of the outer and inner valve ports and so cutting off water flow in various tubes depending upon how far the actuator is moved.

Abstract: A mix door (5) is arranged in air passages (10, 11) of an automotive air conditioning device. The mix door (5) is arranged to extend in a direction to shut an air flow blown from the upstream air passage (10) and swelled in a downstream direction with a predetermined radius of curvature. The door (5) is guided by arcuate cam grooves (19) and driven upward and downward to achieve open/close operation with the aid of a sliding mechanism (M). Compact construction, reduction in air flow resistance, smoothed handling, high sealing and high temperature controlling are achieved.

Abstract: A coil modulator apparatus for use in connection with heat transfer coil assemblies found in commercial heating and air conditioning units is used to limit the number of active tube sections carrying fluid in cooling coil assemblies. The single port modulator apparatus comprises an inner valve with an inner and outer housing. The modulator has valve ports in the sides of the modulator. The inner valve rotates within the outer housing and the openings in the inner housing correspond to those ports in the outer valve. These openings connect with upstream or downstream tube sections in the bank of tubes and allow flow of fluid to be diverted. The actuator arm of the coil assembly rotates the inner valve thus changing the orientation of the outer and inner valve ports and so diverting fluid flow from various numbers of tubes depending upon how far the actuator is moved.

Abstract: An air flow mixing system for a vehicle air conditioning system having a distribution door to force air from a first air flow to mix with a second air flow of different temperature proximate a merging region in the air conditioning system. In one embodiment, the distribution door has an arcuate passageway or scoop to forcibly route air from the first airflow to the second airflow. In a second embodiment, the distribution door has at least one projecting channel to divide each of the first and second air flows into a plurality of alternating flow paths to promote heat transfer and mixing of the two airflows. In each embodiment, the pivoting distribution door facilitates heat transfer between the airflows resulting in a more even temperate airflow emerging from the merging region.

Abstract: A coil modulator apparatus for use in connection with heat transfer coil assemblies found in commercial heating and air conditioning units is used to divert passage of water flow in certain sections of each tube in the coil assembly. The coil modulator apparatus comprises an inner valve, having valve ports in the sides of the valve, that rotates within an outer housing. Apertures in the outer housing connect with each tube in the bank of tubes so that there is an aperture in the outer housing that connects with both the downstream tube section and the upstream tube section of each tube. A portion of the water that collects in the modulator then flows back out of the modulator and into each of the downstream sections of every tube in the coil assembly. Another portion of the water in the modulator is diverted from the bank of tubes so that it flows out of the bypass tube of the modulator and directly back to the return feed of the coil assembly unit.

Abstract: A coil modulator apparatus for use in connection with heat transfer coil assemblies found in commercial heating and air conditioning units is used to divert passage of water flow in certain sections of each tube in the coil assembly. The coil modulator apparatus comprises an inner valve, having valve ports in the sides of the valve, that rotates within an outer housing. Apertures in the outer housing connect with each tube in the bank of tubes so that there is an aperture in the outer housing that connects with both the downstream tube section and the upstream tube sections of each tube. A portion of the water that collects in the modulator then flows back out of the modulator and into each of the downstream sections of every tube in the coil assembly. Another portion of the water in the modulator is diverted from the bank of tubes so that it flows out of the bypass tube of the modulator and directly back to the return feed of the coil assembly unit.

Abstract: The present invention provides anchor tabs at opposite ends of a film member that are anchored to side faces of a door plate of a sliding door. Draft deflectors prevent the inflow of air to between the anchor tabs and the side faces of the door plate. Thus, inflow of air to between the anchor tabs of the film member and the side faces of the door plate is prevented. Also, fluctuations in pressure difference between the inner and outer sides of the anchor tabs are suppressed, and the production of extraneous noise caused by self-excited vibration of the anchor tabs at the ends of the film member is suppressed.

Abstract: An exhaust gas heat exchanger comprising an external shell (20) extending between two tube plates (30, 31) and defining a coolant chamber; internal tubes (38) forming exhaust gas passages which extend between the tube plates (30, 31); an exhaust gas manifold divided by a baffle plate (29) into first and second chambers (26, 28) with an exhaust gas inlet (25) and outlet (27) respectively. The baffle plate (29) is provided with a valve (51) which can be operated between an open position, in which exhaust gas flows along the cooling tubes (38), and a closed position, in which exhaust gas is diverted directly from the first chamber (26) to the second chamber (28).

Abstract: In an air conditioning apparatus for a vehicle, a first cool air bypass passage is provided at an upper side of a heater core, and a second cool air bypass passage is provided at a lower side of the heater core. Cool air from the first cool air bypass passage and warm air having passed through the heater core are mixed in a first air mixing chamber, and a ratio between an amount of cool air and an amount of warm air is adjusted by an air mixing film member. Further, cool air from the second cool air bypass passage and warm air from the heater core are mixed in a second air mixing chamber, a ratio between an amount of cool air and an amount of warm air is adjusted by an air mixing door, and the second air mixing chamber is provided at an immediately downstream air side of the heater core. Thus, in the air conditioning apparatus, a pressure loss in a ventilation system can be reduced.

Abstract: The invention concerns a heating-air conditioning installation for a vehicle, comprising an evaporator (10) and a heating element (12, 14), a fan and various air outlet channels (2, 4, 6), at least means controlling the air stream (20) being placed beside the evaporator (10), according to fluid mechanics. In different positions of the air stream control means, part of the heating-air conditioning installation can be traversed by air in different directions, so that a bypass channel relative to the evaporator may be produced without requiring additional structural volume.

Abstract: Bypass valves and heat exchangers employing same are shown where the bypass valves cause the flow through the heat exchangers to be short-circuited under certain temperature conditions. The heat exchangers are formed of stacked plate pairs or tubes having enlarged communicating distal end portions forming inlet and outlet manifolds. The bypass valves can be plugged in where desired between the enlarged distal end portions to produce bypass flow between the inlet and outlet manifolds. The bypass valves include a housing which can be brazed in place during brazing of the heat exchanger. The housing has inlet and outlet openings in communication with the respective inlet and outlet manifolds for bypass flow therebetween. A removable temperature responsive actuator is located in the housing for blocking and unblocking the bypass flow through the valve.

Abstract: The invention relates to a heating or air-conditioning system and method for ventilating an occupant compartment of a vehicle having a climatic box in which a heat exchanger is accommodated, through which air can flow, and in which at least one air mixing chamber is constructed, which has an air inflow opening for warm air flowing through the heat exchanger and an air inflow opening for cold air flowing around the heat exchanger as well as outlet openings for mixed air, of which at least one outflow opening is arranged on the bottom in the air mixing chamber and at least one outflow opening is arranged on top in the air mixing chamber, and having closing members controlling the opening cross-sections of the inflow openings.

Abstract: A vehicle air conditioning apparatus having two pair of rotatable flow control doors for separately controlling and varying the temperature and flow of air supplied to two different zones of the vehicle interior. Each pair of flow control doors are linked together and operated by a single actuator device.

Abstract: The invention relates to an exhaust gas cooler for an internal combustion engine, preferably in a motor vehicle, with a housing through which exhaust gas can flow in the longitudinal direction and in which a partition extends in the longitudinal direction and separates a first chamber from a second chamber, with an inlet which communicates in the housing with a first chamber and through which the exhaust gas flows into the housing, with an outlet which communicates in the housing at least with the second chamber and via which the exhaust gas flows out of the housing, and wherein the partition has at least one overflow opening through which the first chamber communicates with the second chamber.

Abstract: In an automobile heating, ventilation, and air conditioning unit, an air-purifying filter is slanted and arranged in an upstream air duct defined in a HVAC unit case, so that the upstream end of the filter is supported by an upper supporting portion fixedly connected to the unit case for supporting the evaporator core and so that the downstream end of the filter is located away from the lower end of the evaporator core. Foot vent ducts are partitioned and formed in the unit case, utilizing the dimensional difference between the evaporator and heater cores in both height and width dimensions. Temperature-adjustment ribs, slanted and inwardly extending from the inner periphery of the forward wall of the unit case above the heater core, are provided close to foot vent outlets, so that the foot vent outlets face to a space defined just downstream of the temperature-adjustment ribs.

Abstract: A heat exchanger a width dimension of which is much larger than a height dimension, in which an heat-exchanging medium flow resistance in a heat exchanging core portion is suppressed from increasing, and discharged air temperature is made uniform in the width direction of the heat-exchanging core portion. The heat-exchanging core portion is divided into a first core portion and a second core portion. The hot water in the first core portion and hot water in the second core portion flow in an opposite direction to each other. Thus, even when the heating heat exchanger, the width dimension of which is much larger than the height dimension, is used, the air temperature is prevented from varying in the width direction. Further, as the heat-exchanging medium flows in the first and second core portions in parallel, the heat-exchanging medium flow resistance is suppressed from increasing.

Abstract: In an air feeder for supplying air with a predetermined temperature and humidity into a cup in a resist coating unit provided in a coating and developing system, a cooling section, a by-pass, a heating section, a humidifying section, and a blower are provided. 55% of introduced air is cooled in the cooling section, 45% of the introduced air passes through the by-pass, and mixed air of the cooled air and the air from the by-pass is heated in the heating section and humidified in the humidifying section, thereby enabling energy-saving and space-saving temperature and humidity control.

Abstract: A heat exchanger for a motor vehicle exhaust includes a tubular body having a first end, a second end, a peripheral sidewall, and at least two flow passages that extend between the first end and the second end. The at least two flow passages include at least one heat exchange fluid flow passage and at least one bypass fluid flow passage. A heat exchange coil is positioned in the at least one heat exchange fluid flow passage. The heat exchange coil has an inlet and an outlet extending through the sidewall of the tubular body. A valve is provided for selecting between the at least one heat exchange fluid flow passage and the at least one bypass fluid flow passage.

Abstract: A mix door (5) is arranged in air passages (10, 11) of an automotive air conditioning device. The mix door (5) is arranged to extend in a direction to shut an air flow blown from the upstream air passage (10) and swelled in a downstream direction with a predetermined radius of curvature. The door (5) is guided by arcuate cam grooves (19) and driven upward and downward to achieve open/close operation with the aid of a sliding mechanism (M). Compact construction, reduction in air flow resistance, smoothed handling, high sealing and high temperature controlling are achieved.

Abstract: A heat exchange unit for hot gas heat recovery has a heat exchange array situated within a heat exchange duct defined between a cylindrical outer casing and an axially slidable inner sleeve. The sleeve, together with a plug valve at the upper end of the unit, forms a variable position sleeve valve arrangement which simultaneously controls the flow of hot gas through the heat exchange duct and the bypass duct.

Abstract: A vehicle air-conditioning system that independently controls left-right air flow distribution in correspondence with left and right heat loads during a maximum cooling mode. In the system, blowout air flow is increased when driver seat side and passenger seat side air-mixing film members are both positioned in a maximum cooling position, and the heat load has risen in only one of a driver seat side space and a passenger seat side space in a passenger compartment. Further, each respective film member is operated to fully open a cool air bypass passage on the side on which the heat load has risen and the respective film member corresponding to the side on which the heat load has not risen significantly is operated to reduce the open area of the cool air bypass passage. At the same time, fan speed is increased to increase the air blow amount.

Abstract: A by-pass valve and a heat exchanger employing same is disclosed where the by-pass valve makes a short circuit from the heat exchanger inlet to the heat exchanger outlet to disable the heat exchanger under certain temperature conditions. The by-pass valve includes a housing defining a chamber. Three main ports communicate with the chamber, one being a valve port. A temperature responsive actuator located in the chamber operates a spring loaded valve to open and close the valve port. The valve port can be connected to one of the heat exchanger inlet or outlet, the other main ports are then connected in series with the other of the heat exchanger inlet or outlet.

Abstract: A heat exchanger is disclosed having a plurality of stacked plate pairs or tubes, each having a predetermined internal cold flow resistance. A bypass conduit is included in the stack of plate pairs or tubes. The bypass conduit includes a central row of spaced-apart, mating dimples defining longitudinal flow channels on either side of the dimples for bypass flow through the bypass conduit under cold flow conditions. The longitudinal flow channels have a height and width such that the cold flow resistance therethrough is less than the cold flow resistance through the stacked plate pairs or tubes. In normal or hot flow conditions, the dimples create flow resistance by forcing the fluid flowing through the bypass conduit to change velocity and direction. This forces more oil to flow through the stacked plate pairs or tubes increasing heat transfer performance.

Abstract: A heat exchanger system is provided having a heat exchanger including a plurality of conduits to receive a first fluid. The conduits have a plurality of passages therebetween which are in heat exchange relation therewith to receive a second fluid. An inlet and an outlet are connected to the plurality of conduits, and an inlet and outlet are connected to the plurality of passages. A valve is connected to one of the inlets to limit fluid flow therethrough. A thermally-responsive actuator is provided for the valve and extends into one of the conduits and the passages to control the valve as an incident of the temperature of a fluid flowing through the one of the conduits and the passages.

Abstract: An aftercooler for cooling a compressed fluid exiting from a compressor, the aftercooler including a radiator unit for receiving the compressed fluid exiting from the compressor and for cooling the compressed fluid, the radiator unit having an inlet for receiving the compressed fluid, an outlet for discharging the compressed fluid and a plurality of heat exchange passageways connecting the inlet and the outlet for transferring heat from the compressed fluid. The aftercooler also includes a bypass channel for bypassing the plurality of heat exchange passageways which extends from a first point substantially adjacent the inlet of the radiator unit to a second point substantially adjacent the outlet of the radiator unit.

Abstract: An outdoor equipment cabinet enclosure designed to effectively dissipate heat generated by electrical equipment components housed therein includes a main interior section for housing active electronic components and a lower section configured to store banks of batteries for a stand-by power supply system with a lower wall separating the batteries from the electronic components in the main interior section. At least one heat exchanger is disposed in the main interior section and includes an inlet port and means for creating a circulating air flow path for interior air within the main interior section. An outdoor air flow path is defined by the lower wall and the upper surfaces of the batteries and at least one baffle is disposed within the outdoor air flow path which is configured to deflect outdoor air flowing across the upper surfaces of the batteries into the at least one heat exchanger.

Abstract: An air handling system for heating, ventilating and air-conditioning systems to provide a variable air flow between an air treatment section and an air bypass section includes selectively sliding panels to vary the air flow between the air treatment section and the bypass section. Positioning of the panels can direct the flow of incoming air to be conditioned from all incoming air flowing through the air treatment section to all incoming air flowing through the bypass section and a mixture of incoming air flowing through the air treatment section and the bypass section.

Abstract: A compact HVAC module housing (30) incorporates a novel temperature valve belt (74) and support frame therefore (60) that fit between an evaporator (56) and heater (58). This allows the entire housing (30) to be very compact, and to be more easily integrated into a vehicle body structural cross beam (32). The temperature valve and its location, as well as a reversed air stream through the heater (58), together allow the mixing area for the cold and not air streams to be well within a minimal space envelope of the housing (30), rather than outside of it.

Abstract: A process and apparatus for heating gas in which a flow rate D0 of a warm fluid is caused in an input line, connected at its upstream portion to a source of warm fluid and at its downstream portion to the inlet of one of the passages of a heat exchanger; a portion of the flow D0 is diverted before it reaches the inlet of the first passage, into a branch line connected at its upstream portion to a so-called primary point of the inlet line located between the source of warm fluid and the inlet of the first passage; the gas to be heated is caused to circulate in another passage of the exchanger, so as to effect heat exchange between the gas to be heated and the warm fluid, thereby to obtain at the outlet of the second passage a warmed gas, and at the outlet of the first passage, a cooled warm fluid; the temperature of the warmed gas is controlled by the aid of a flow rate regulating valve located in a selected position in the inlet or outlet line.

Abstract: When the engine is stopped while the engine is warmed up, the cooling water in the engine stays therein without flowing out of the engine, and the cooling water in the radiator or the bypass passage is used for heating source for the heating operation. In this way, it is possible to heat the passenger compartment continuously even after the engine is stopped and to suppress the temperature of the cooling water from lowering to reduce the emission at restarting of the engine.

Abstract: An apparatus for supplying compressed air to air operated elements of a locomotive includes an air compressor, an aftercooler coupled for receiving compressed air from the compressor, a cooling fan for blowing ambient air onto the aftercooler for reducing the temperature of the compressed air, whereby moisture in the compressed air forms condensation which is discharged from the compressor during normal operation of the aftercooler. A bypass system shunts the compressed air from the compressor around the aftercooler when the condensation freezes in the aftercooler passages and blocks normal air flow. The bypass system includes an orifice of a size selected to create a pressure drop which is greater than a pressure drop across the aftercooler when air flow through the aftercooler is not inhibited by blockage whereby air flow from the compressor normally passes through the aftercooler and bypasses the bypass system.

Abstract: A shell and tube heat exchanger for exchanging heat between a shell side fluid and a tube side fluid has a longitudinally extending shell, a longitudinally extending tube bundle and one or more baffles positioned within the shell for directing the shell side fluid to flow across the tube bundle. One or more valves is also provided within the shell of the heat exchanger. Each valve is operable between a first position and a second position and co-operates with a baffle for adjusting the flow of shell side fluid through the shell side of the exchanger. Each of the valves is controlled by an external actuator.

Abstract: A geothermal community loop field which serves as a shared means of heat exchange for a plurality of thermal loads. Heat is exchanged between the ground and a circulating heat exchange fluid in at least one subterranean heat exchanger. Heat is exchanged between each thermal load and the circulating heat exchange fluid by contacting the external heat exchanger of each thermal load with the circulating heat exchange fluid. Flow of the circulating heat exchange fluid between the geothermal community loop field and each thermal load is controlled by a plurality of flow control centers, each servicing one thermal load. The flow control centers provide means for installing additional thermal loads or maintaining existing loads without affecting the operation of the rest of the system. In addition, the flow control centers provide a means for setting the flow rate of heat exchange fluid to each thermal load.

Abstract: An air flow mixer structure for a vehicle air conditioning system has a first conduit for a first air flow, a second conduit for a second air flow, an opening between said first and second conduits for merging said first and second air flows in a merging region and a common air channel for said merged air flows, the mixer structure having an air inlet region and an air outlet region opening into said merging region, the structure comprising plural air passages disposed between said inlet region and said outlet region for dividing an air flow at said inlet region into plural air flows at plural said openings into said merging region.

Abstract: A fuel cooler and coolant filter assembly for the filtering of coolant and the cooling of a fuel flow for use in connection with a cylinder head of a vehicle engine includes three primary components which are assembled to one another in a stacked configuration and which in turn are assembled to the cylinder head. These three primary components include a fuel cooler core which is assembled directly to the cylinder head and which includes a fuel inlet, a fuel outlet, and a heat exchanger. The interior of the fuel cooler core is designed for the incoming fuel to flow and circulate across the exterior of the heat exchanger prior to exiting. The second primary component includes a filter head assembly with various inlets, outlets, and passageways. The filter head assembly is attached directly to the fuel cooler core so as to deliver coolant into the heat exchanger.

Abstract: An air conditioner for vehicles has a housing and has an evaporator and a heat exchanger which, viewed in the air flow direction, are successively arranged in the housing at a distance from one another and enclose a housing section between one another whose bottom is approximately V-shaped. A warm air flap is swivellably arranged in the housing section for controlling the air supply to the heat exchanger.

Abstract: Disclosed is a heat exchange tube having angled heat-exchange performance-improving indentations on the tube. These angled performance-improving indentations increase the amount of heat transferred to a heat exchange liquid flowing through the tubes without substantially increasing the pressure drop or reducing the flow rate of the heat exchange liquid through the tube. An array of tubes can be made using heat exchange tubes of this invention, and a heat exchanger can be formed from an array or from tubes of this invention. In certain preferred embodiments, heat exchangers of this invention are particularly well-suited for use in solar-heating swimming-pool water or for use in thermal energy storage units.

Abstract: Known designs of disk coolers for motor vehicles have flow guides intended to achieve optimum through flow in the hollow chambers formed in the disk coolers. It has been found that the through flow is nevertheless not optimal. Accordingly, it is proposed, at least in the hollow chambers through which the oil flows, to block off the inlet and outlet openings located in the vicinity of a cental return opening respectively by partitions that form flow pockets that serve to force the medium flowing at the periphery of the respective hollow chambers to pass through the entire cross sections of the chambers. This improved construction is suitable for use for disk oil coolers of motor vehicle engines.

Abstract: In a plate heat exchanger the plate interspaces form first flow passages (13, 15; 15a) for a first fluid and other flow passages (14) for a second fluid. The plates have openings which for one of the fluids form one inlet channel (10) and one outlet channel (10a) through the plate package, the channels communicating with each other through the first flow passages (13, 15; 15a). A by-pass passage (15; 15a) is formed by at least one of the first flow passages and gives a through flow resistance that is substantially smaller than that given by each one of the other (13) first flow passages. In the inlet channel (10) or the outlet channel (10a), or in both channels, a valve member (17; 18; 26) is arranged for setting of a desired flow through the by-pass passage (15; 15a).

Abstract: An improved film type air temperature control valve for an automotive HVAC assembly has a flexible, apertured belt that wraps closely around both faces of a heater core case internal to the HVAC housing. Winding and unwinding of the belt around the heater core case, and across a heater core bypass passage, simultaneously opens up more of the bypass passage as it closes off more of the heater core faces, and vice versa. Because of the close conformance of the belt to and across the heater core faces, both faces of the always hot heater core can be completely closed to direct or indirect air flow, preventing any undesired incidental heating of the air flow.

Abstract: A heat exchanger, preferably intended for air conditioning in a fan installation, comprises a corrugated plastic element built up of heat exchanger packs. One of the air flows passes laminarly and unbroken in vertical flow paths formed between strips that hold the individual elements apart from each other. The other air flow passes through channels formed in each element. The walls of the element are thin and the thinner the wall thickness the better the efficiency obtained.

Abstract: A heat exchanger has an outer pressure jacket, which is provided with an entry connection for the supply of and an exit connection for the removal of a first heat exchange medium, the jacket surrounding U-shaped, bent pipes through which a second heat exchange medium flows. The pipes are mounted in a pipe supporting floor that is connected with the pressure jacket. The U-shaped pipes are surrounded by a guide jacket which is inwardly radially spaced from the inside wall of the pressure jacket and defines an intermediate annular space therewith. Inner and outer legs of the U-shaped pipes are respectively positioned on one of two concentrical partial circles. The inner pipe legs surround a central pipe which is oriented along the longitudinal axis of the heat exchanger, is connected with the entry connection, is open towards the interior of the heat exchanger, and extends from one end of the heat exchanger to the vicinity of the pipe supporting floor which is located at the other end of the heat exchanger.