Abstract: A heat exchanger assembly including an elongated tubular heat exchanger enclosure defining an interior chamber. A tube sheet is positioned within the interior chamber of the heat exchanger enclosure separating the interior chamber into a shell side and a channel side. The interior portion is configured to removably receive a tube bundle positioned within the shell side of the interior chamber. An annular sleeve member is positioned within the channel side of the interior chamber of the heat exchanger enclosure. An annular elastic torsion member is positioned within the channel side of the interior chamber of the heat exchanger such that the sleeve member is positioned between the tube sheet and the elastic torsion member. The elastic torsion member has an inner circumference deflectable relative to its outer circumference for torsioning the elastic torsion member.

Abstract: A heat exchanger assembly including an elongated tubular heat exchanger enclosure defining an interior chamber. A tube sheet is positioned within the interior chamber of the heat exchanger enclosure separating the interior chamber into a shell side and a channel side. The interior portion is configured to removably receive a tube bundle positioned within the shell side of the interior chamber. An annular sleeve member is positioned within the channel side of the interior chamber of the heat exchanger enclosure. An annular elastic torsion member is positioned within the channel side of the interior chamber of the heat exchanger such that the sleeve member is positioned between the tube sheet and the elastic torsion member. The elastic torsion member has an inner circumference deflectable relative to its outer circumference for torsioning the elastic torsion member.

Abstract: Disclosed is a shell-and-tube heat exchanger type with a tube bundle and has a redistribution chamber connected to tubes of the tube bundle and to a duct. The duct extends between the redistribution chamber and the shell.

Abstract: A heating, ventilation, and/or air conditioning (HVAC) system includes an enclosure that is divided by a partition extending between a first panel and a second panel of the enclosure such that the partition defines an outdoor air flow path and a return air flow path through the enclosure. The partition includes an opening extending between the outdoor airflow path and the return airflow path. The HVAC system also includes an energy recovery wheel that translatably extends through the opening and is positioned within the outdoor air flow path and the return air flow path. The energy recovery wheel is disposed within the enclosure at an oblique angle relative to the outdoor air flow path and the return air flow path.

Abstract: A flow control device includes a body and a flow control element. The body includes a thermal conditioning passage disposed within a side wall, disconnected from a flow passage, and extending between a first conditioning port and a second conditioning port. The thermal conditioning passage has a first portion extending circumferentially around a first circumferential portion of the interior surface of the flow passage, a second portion axially spaced from the first portion by a first axial U-shaped bend and extending circumferentially around the first circumferential portion and a second circumferential portion of the interior surface of the flow passage to form a first circumferential U-shaped bend, and a third portion axially spaced from the second portion by a second axial U-shaped bend and extending circumferentially around the second circumferential portion of the interior surface of the flow passage.

Abstract: Provided is a connector including: a first buffer member including a spiral-shaped wire; a second buffer member that has a substantially annular and flat plate-like shape; a collar member that includes a cylindrical portion surrounded by the first buffer member and the second buffer member, a first flange facing a radially inner side of the first buffer member, and a second flange facing a radially inner side of the second buffer member; and a coupling member that includes a first holder section holding radially outer sides of the first buffer member and the second buffer member, a second holder section holding the shielding body, and a coupling member base portion, in which a gap is formed between the second buffer member and the cylindrical portion, and the radially inner sides of the first buffer member and the second buffer member are sandwiched by the first flange and the second flange.

Abstract: An HVAC system having an airflow path, a primary heat exchanger disposed along the airflow path, wherein the airflow path at least partially passes through the primary heat exchanger, and a multipurpose cabinet selectively configurable between at least a first configuration for housing a first type of auxiliary heat transfer component and a second configuration for housing a second type of auxiliary heat transfer component, wherein the airflow path at least partially passes through the multipurpose cabinet.

Abstract: A drying system includes a fluidized bed dryer and fluidizing gas loop. The system is a closed loop so that fluidizing gas used to dry particulate matter can be reconditioned and recycled to fluidize and dry additional particulate matter. The fluidizing gas is reconditioned by removing fine particulates and water vapor. The drying system includes oxygen control features to prevent oxygen from entering the system. A method for drying particulate matter includes fluidizing the particulate matter in a dryer with a fluidizing gas, heating the particulate matter to remove water, removing water vapor and fluidizing gas from the dryer, removing fines and water vapor from the fluidizing gas, recirculating the fluidizing gas to the dryer to fluidize additional particulate matter and removing dried particulate matter from the dryer. A modular drying system reduces the amount of construction necessary at the installation site.

Abstract: A heat exchanger has an exchanger unit, including at least one first coiled conduit and one second coiled conduit that are substantially coaxial, and a casing for housing the exchanger unit. The casing has a first end wall, a second end wall, and a peripheral part between the two end walls. Each conduit has an inlet and an outlet, where the outlet of the first conduit is connected substantially in series to the inlet of the second conduit. The exchanger unit is supported by the first end wall of the casing, with the inlet of the first conduit and the outlet of the second conduit which are substantially at the first end wall of the casing.

Abstract: An apparatus for storing fluids in an exterior climate-controlled chamber. The chamber provides a climate controlled environment for one or more useful fluids without requiring interior living space for storage of such fluids. In certain embodiments, the chamber provides a mechanism for automatic delivery of fluids directly into the living space.

Abstract: A cooling arrangement is disclosed for a vehicle having a first component, a first duct, and a cooling fan configured to deliver air through the first duct to the first component when the cooling fan is operated. The cooling arrangement includes, but is not limited to, a second component, a port coupled to the second component, the port being accessible from a position external to the vehicle, and a second duct having a first end positioned proximate the port and a second end in fluid communication with the first duct. The second duct is configured to deliver air from outside of the vehicle to the second component when the cooling fan is operated while the vehicle is off.

Abstract: A housing for an air conditioning module, in particular for an air conditioning module of a vehicle, includes a hinged cover for at least one part of the air conditioning module. The hinged cover can be molded in one piece with the housing and the housing can include a living hinge.

Abstract: A device for cooling a gas flow of an internal combustion engine includes a housing, an inlet and an outlet for a gas of the internal combustion engine, which is to be cooled, an inlet and an outlet for a liquid coolant, a heat exchanger for heat transfer between the gas and the coolant, a first wall section of the housing, wherein the first wall section is arranged between the coolant and the gas flow, and a second wall section of the housing, wherein the second wall section is arranged between the coolant and the atmosphere, wherein the first wall section and the second wall section are integrally formed in one piece.

Abstract: An example test system includes: a manifold including fluid channels, where the fluid channels are for holding coolant; a quick disconnect mechanically coupled to the manifold, where the quick disconnect includes a channel for passing coolant between a fluid channel and a test board; a containment plate mechanically coupled to the manifold, and a cover over at least part of the quick disconnect, where the cover is hermetically sealed to the quick disconnect and to the containment plate to thereby form a containment chamber.

Abstract: A liquid heating system and heat exchangers therefore are disclosed. Each heat exchanger comprises a right heating chamber having a right input port and a right output port, and a left heating chamber having a left input port and a left output port. A heating circuit is configured such that circulating heated supply fluid through the heating circuit heats target liquid present in the heating chambers. The system includes a plurality of heat exchangers including a first, a final, and a plurality of middle heat exchangers. The right and left heating chambers are connected such that target liquid flows into the right input port of the right chamber of the first heat exchanger and through each right chamber to the left chamber of the final heat exchanger, and then through each left chamber and through the left output port of the first heat exchanger to a hot liquid discharge.

Abstract: A heat exchanger unit and a method for aseptically connecting such units. The heat exchanger unit comprises at least one fluid inlet and at least one fluid outlet. At least one of the inlet or outlet is sealed by at least one film and the contact surface between the film and the separation or reaction unit is aseptic. The films are adapted to be mated with a corresponding film on another heat exchanger unit and said mated films are adapted to be pulled out together two and two after mating such that corresponding fluid inlets/outlets on the two connected units are mated aseptically.

Abstract: A micro fluid device includes a heating unit and a cooling unit, each with piping disposed within. The heating and cooling units are integrally coupled together, and fluid flows into the piping of respective units. A temperature control device includes a heat insulator which has a through hole equal in diameter to the piping disposed within the heating unit and cooling unit. The heat insulator is interposed between heating unit and the cooling unit. A positioning mechanism positions the heat insulator to bring the piping into communication with the through hole at the time of coupling the heating and cooling units.

Abstract: A heat exchanger with mini channels or micro channels provides enhanced heat transfer abilities. One or more surfaces of the channels may be covered with a nanostructure, such as single walled carbon nanotubes or multiwalled carbon nanotubes. The nanostructures may fully cover the entire surface of the channel or a selected surface area of the channel. Further, the nanostructures may be arranged into multiple patterned bundles covering the surface of the channel.

Abstract: The invention relates to a heating assembly (1) comprising at least one PCT element, in particular for a motor vehicle, said PCT element (2) being located between two contact sheets (3, 4), which are used to make electrical contact. According to the invention, the heating assembly (1) comprises a frame (7) and at least one of the two contact sheets (3)comprises a staggered section outside the frame (7), said staggered section of the projecting part (10) of the contact sheet (3) running parallel with the remaining part (11) of said sheet (3).

Abstract: A heat dissipating system includes a chassis, a number of heat dissipating members received in the chassis, and a number of duct cover. The chassis defines a number of cavities corresponding to the outlets of the heat dissipating members is defined in the chassis. Each duct cover includes an outer flap and an inner flap. An opening is defined in the outer flap. The outer flap is rotatably mounted to the chassis to cover or uncover the corresponding cavity. The inner flap is rotatably mounted to the outer flap to cover or uncover the opening.

Abstract: A heat exchanger, particularly a charge air heat exchanger or exhaust gas heat exchanger, is provided for the heat exchange between a first fluid, particularly a charge air, or an exhaust gas, and a second fluid, particularly a coolant, comprising the following: heat exchanging guides for the first and second fluids, the guides being separated from each other in the core, the core having a plurality of flow channels through which the first fluid flows, and a housing that receives the flow channels and through which the second fluid flows at least one compartment lid, which is flow-connected to the flow channels, and a base that is attached to the compartment lid and that is equipped with one or more passage openings for flow channels.

Abstract: The invention relates to a component (20) for supporting a tubular filter member (15) in a portable channel (2) in a plate heat exchanger (1). The invention also relates to a device including the component (20) and the filter member (15). Furthermore, the invention relates to a plate heat exchanger (1), which includes a package of heat transfer plates (3) provided between a first plate (5) and a second plate (6). The filter member (15) has an inner surface and an outer surface. The component (20) includes a first part (21), which is arranged to be introduceable into the filter member (15) to abutment against the inner surface of the filter member, and a second part (22), which is arranged to abut a surface area of one of said first and second plates (5, 6), which surface area extends around the porthole channel (2).

Abstract: A heating and air-conditioning system for a motor vehicle has a conditioning housing that includes a connecting section which is provided with at least one air outlet opening. Using connecting structure on the connecting section, the air outlet opening may be connected to either an attachable rear vehicle compartment temperature-control unit or closed tightly, in a leak-proof manner, by a removable covering part.

Abstract: A vibration and heat insulating board fixed so as to cover at least part of a heat source while forming a gap against the heat source surface, in order to lessen diffusion of heat from the heat source fixed in a vibration source, in which the heat source and the vibration and heat insulating board are coupled by means of a collar member having a pair of locking pieces fitted to the vibration and heat insulating board main body and bolted to a mounting part of the heat source, and ring-shaped coil members interposed between the pair of locking pieces of the collar member and the vibration and heat insulating board main body.

Abstract: A heating, ventilation and air conditioning system for a vehicle is constructed from two modules, one for the engine compartment and a second for the passenger compartment. The engine compartment module has a base formed for positioning on at least two locations on a dash panel, a outside air inlet, a secondary air inlet for communication with the passenger compartment, an air outlet and defining a air transport conduit connecting the outside air inlet or the secondary air inlet with the air outlet. Downstream from the engine compartment is a passenger compartment module having a slide slot for a heater core, an inlet for communication with the air outlet from the engine compartment module, an air manifold, a panel exhaust from the air manifold, a defrost exhaust from the air manifold, a compartment door providing access to the slide in friction slot, and an air channel from the inlet to the air manifold. The heater core is positioned in the slide in slot.

Abstract: A modular heat recovery ventilation system includes a modular heat exchanger and a modular apparatus spaced from the heat exchanger for delivering both fresh air and exhaust air to the heat exchanger. The apparatus includes separate blowers for generating two separate air streams. The apparatus includes an access plate at the bottom thereof allowing access to the interior of the enclosure of the apparatus through a ceiling.

Abstract: A heating, ventilation and air conditioning system for a vehicle is constructed from two modules, one for the engine compartment and a second for the passenger compartment. The engine compartment module has a base formed for positioning on at least two locations on a dash panel, a outside air inlet, a secondary air inlet for communication with the passenger compartment, an air outlet and defining a air transport conduit connecting the outside air inlet or the secondary air inlet with the air outlet. Downstream from the engine compartment is a passenger compartment module having a slide slot for a heater core, an inlet for communication with the air outlet from the engine compartment module, an air manifold, a panel exhaust from the air manifold, a defrost exhaust from the air manifold, a compartment door providing access to the slide in friction slot, and an air channel from the inlet to the air manifold. The heater core is positioned in the slide in slot.

Abstract: A cap assembly for collecting cooling gas from a coolant chamber tube is disclosed. The cap assembly having connecting means and outlet means extending from its side walls being generally shaped and sized for detachable mounting on the body of the cooling gas chamber tube. The cap assembly is also employed in a hot optical fiber process which is being cooled by helium.

Abstract: The invention refers to a component (20) for supporting a tubular filter member 815) in a portable channel (2) in a plate heat exchanger (1). The invention also refers to a device including the component (20) and the filter member (15). Furthermore, the invention refers to a plate heat exchanger (1), which includes a package of heat transfer plates (3) provided between a first plate (5) and a second plate (6). The filter member (15) has an inner surface and an outer surface. The component (20) includes a first part (21), which is arranged to be introduceable into the filter member (15) to abutment against the inner surface of the filter member, and a second part (22), which is arranged to abut a surface area of one of said first and second plates (5, 6), which surface area extends around the porthole channel (2).

Abstract: In a cover structure for restricting adhesion of foreign materials such as an antifreezing agent to a resinous tank of a heat exchanger, a cover member is arranged such that its first end is in the proximity of a boundary between a core portion and the resinous tank of the heat exchanger and its second end is adjacent to an opening through which air is introduced. The cover member blocks the foreign materials entering from the opening and restricts. Also, the cover member directs the air having passed through the opening toward the core portion. Thus, the tank is less likely to deteriorate due to adhesion of the foreign materials. Further, efficiency of heat exchange of the core portion improves.

Abstract: An air conditioning apparatus for an automotive vehicle includes a heater core and a mix door assembly installed in a case. The mix door assembly is detachably installed in the case through an opening formed at a side wall of the case. The mix door assembly constitutes a housing, a mix door and a slide mechanism. The slide mechanism is arranged to slide the mix door according to a received rotational force so as to vary the ratio of warm air to quantity and cool air quantity.

Abstract: A closure cap which can screw onto the fixed neck of a cooling system expansion tank. The closure cap is provided with a screw cap and a threaded section in which a combination pressure-vacuum valve is mounted concentrically and in such a way that it can rotate in relation to the screw cap. The valve is provided with a sealing element which comes into tight contact with the fixed neck when the closure is screwed. To endure that the closure cap can be unscrewed only when the excess heat in the cooling system has been completely dissipated, it is proposed that the closure cap when screwed onto the fixed neck would be prevented from unscrewing means of a temperature-dependent control element.

Abstract: A retrievable cane disclosed includes a cane body to which there is attached a retrieval line that is anchored at a lower end and extends from the inside of the cane body at the lower end up through the cane body out through the rear of the cane body below the grip. The retrieval line has an elastic section that allows an attachment end outside the cane body to be releasably attached to the body of the user preferably having the grip portion at the waist allowing normal walking by the user. The elastic section allows the user to pull the cane body away from the waist for use during walking and the elastic section automatically returns the cane to the user's waist when released.

Abstract: A spiral heat exchanger is disclosed for indirect heat transfer between fluid media, primarily in heat recovery applications characterized by undissolved materials suspended in one or both fluid media. The heat exchanger has a transition chamber between the inlet for a fouling fluid (one which carries undissolved materials) and a heat exchanging passage for the fouling fluid. The transition chamber is has an enlarged cross section compared to the fouling fluid passage to collect undissolved material that may otherwise flow into the fouling fluid passage. This arrangement allows undissolved material to collect without completely blocking the fouling fluid passage. Easy access is provided to the transition chamber to remove collected undissolved material. A heat-conducting strip spirally wound within a shell or casing with opposite edges of the strip sealed to the casing defines two adjacent, spirally extending fluid passages.

Abstract: The cylindrical enclosure 12 of a recuperator 10 as in FIG. 2 contains an annular coaxial heat exchanger 50 full of cooling liquid 22 circulating therethrough. Exhaust gas from an internal combustion engine flows from an inlet end 32 through the heat exchanger 50, first in an axial region 15 via a conduit 14, then back through a surrounding annular region 18, then through tubes 37 to an outlet end 34. The inlet 30 and outlet 31 for the gas are in the side wall 40 of the cylindrical body 12, and the exhaust gas 11 enters and leaves via conduits 14 and 19 that are perpendicular to the side wall 40 at the inlet 30 and at the outlet 31. So the ends 41 and 42 of the body 12 are free of adjacent obstruction, and at least one of them is removable, as in FIG. 4 or FIG. 5 . Thus, the recuperator 10 can be opened and closed to make the interior accessible for inspection, cleaning, or other desired purpose.

Abstract: An improved potable water collection apparatus contained within a housing, for the collection of potable water from a dynamic airflow extending between inlet and outlet ports. A compressor is mounted within the housing to circulate a refrigerant fluid in a closed loop circulation system between the compressor, a condenser coil and a cooling coil. The condenser coil and the cooling coil are mounted in the dynamic airflow extending between the inlet and outlet ports. A water collection pan is located beneath the cooling coils to collect condensation which forms as water droplets on the outer surface of the cooling coils, and directs the collected water droplets into a suitable water collection container. A water filter is disposed between the collection pan and the container. A liquid level sensor stops the operation of the compressor when the water in the collection container reaches a desired level.

Abstract: An operating system for a dual fuel heating system having first and second heat pump stages, first and second gas furnace stages, an executive controller for tracking time increments and call control strategies at appropriate levels, a demand control for calculating the amount of time each heat pump can be on during a predetermined time window, a data storage apparatus, a thermostat, a first predicting module for predicting non-heat pump electrical load based on a moving average, a second predicting module for predicting heat load based on a moving average, and a limiting module for setting demand limits for off-peak, mid-peak and peak periods. The executive controller is operated to initiate operation of the foregoing routines to determine, based on historical building profile information including non-heat pump electric power information the availability of heat pump power with no increase in demand charges during any given incremental interval.

Abstract: The invention discloses a novel head closure apparatus for shell and tube-type heat exchangers. The disclosed apparatus is substantially resistant to thermal stress cracking in that it has an internal closure chamber configured to withstand and dissipate thermal stresses caused by rapidly changing thermal gradients. The apparatus also provides for full access to the entire interior volume of the head closure and to the entire area of the head closure inner tubesheet surface in order to facilitate maintenance and repairs. The invention also discloses a compact and efficient retaining key apparatus for constraining the end-cover of a cylindrically-shaped head closure member against internal working pressures. The apparatus enables substantial reductions in the masses of the retaining keys, the head closure member, and the end-cover, which results in the head closure apparatus being simpler and more economical to manufacture and maintain.

Abstract: Internal tube sheet sealing apparatus assembly for tubular heat exchangers which operate with pressures of, e.g., greater than 1000 psi on both sides of the tube sheet and wherein the tube sheet itself is usually subject to a lower differential pressure, comprising tube sheet loading means including a plurality of shear means assemblies and bolts the can load the tube sheet joint independently of each other, said tube sheet loading means enabling (1) the tightness of the tube sheet joint and tube joints to be inspected during differential pressure hydrotesting of the shell side without the channel cover assembly mounted in place and (2) "in-service" re-loading of the tube sheet joint without removing the channel cover assembly.

Abstract: A glass tube heat exchanger including a sealing sleeve comprising at least one hydraulic sealing section, an intermediate sealing section and an interior sealing section is disclosed. The hydraulic sealing section has a triangular cross section including one obtuse angle formed by two legs, one of which extends radially outwardly from the longitudinal axis of the seal. The intermediate sealing section comprises a generally cylindrical shaped body and at least one, and preferably two, toroidal belts. The interior sealing section comprises a lip adapted to seal tightly against the glass tube and a flange adapted to seal against the tube sheet. Preferably, the interior sealing section is a mirror image of the hydraulic sealing section.

Abstract: Disclosed are air seals adapted to be so engaged in a receiving card rack slot as to thrust out against the opposed slot bases and thus establish "base-engaging" retention forces, this effected in some embodiments by forming a base-engaging flexure strip along each tongue of the seal to that, despite dimensional and other variations, each flexure strip will be thrust-away somewhat from its slot-forming channel, when the seal is firmly seated in a slot.

Abstract: A heat exchanger for two fluids, especially an oil cooler for oil and water in an internal combustion engine. The heat exchanger is made up of a dividing wall having a meander-like cross section which is bounded by two side covers to form longitudinal channels and having a headering system comprising cross channels, connecting channels, feed channels, and inlet and outlet openings located at each end of the heat exchanger. The heat exchanger is of modular design so that it can be easily expanded by the connection of several heat exchanger units.

Abstract: An impact resistant compact condenser comprising a plastic shell having two side walls enclosing at least one heat transfer disc disposed between said side walls dividing the shell into at least one cooling cell and at least one vapor cell. Means are provided for retaining said disc in sealed abutment against said end walls of said side walls, each of said cells having an inlet port and an outlet port.

Abstract: A one-piece removable tube lane block includes an L-shaped angle bar, having one end thereof fixed to the closed end of a cylindrical sleeve and extending axially outwardly therefrom. The outer end of the sleeve has a radially outwardly extending annular retaining flange for engagement with the vessel wall at the outer end of the handhole. The blocking portion is dimensioned to be insertable through the handhole and into the tube lane to a use position with the distal leg of the L-shaped bar disposed perpendicular to the tube sheet and with the mounting sleeve disposed in the handhole and held in place therein by set screws extending radially outwardly through the sleeve.

Abstract: The device comprises a segment ring effective to be inserted into a circumferential groove formed in the exchanger headpiece and having, in the radial direction such dimension as to include, within the annular portion projecting from the header chamber portion groove, small cylinders pressing against the peripheral area of the tube plate, a circumferential lug being further provided on the tube plate effective to be associated to the inside surface of the segment ring.

Abstract: A waterbox for a shell and tube heat exchanger is disclosed. The waterbox is attached at one end of the heat exchanger to a tube sheet through which heat exchange tubes extend. Nozzle connections are made to the waterbox through a top member having an access opening which projects onto an area of the tube sheet through which the heat exchange tubes extend. The openings of the nozzles project onto areas on the tube sheet through which no heat exchange tubes extend. A removable cover is positioned over the access opening in the top member so that, when fluid flow conduits are connected to the nozzles on the top member, the conduits and removable cover are positioned relative to each other to allow removal of the cover without disturbing the connections between the conduits and the nozzles. In an alternative embodiment, the conduit connections are made through the back wall of the tube sheet rather than through the top member. This allows use of a waterbox with a removable top member having no nozzles.

Abstract: A method and apparatus for sealing a hole in the inner wall of a double wall heat exchanger in which cover means is positioned in biased relationship to the hole and a frame positioned in the opening through which the cover means is inserted against the hole.

Abstract: A modular solar heating device particularly designed and constructed for installation at the base of a mobile home, and comprising a support housing of a substantially triangular cross sectional configuration for supporting a light transmitting cover in an angular orientation with respect to the horizontal for transmitting energy from the sun to a heating plate disposed within the housing in spaced and substantially parallel planar relation with respect to the cover. A cool air receiving chamber is provided below the heating plate and in communication with a cold air return vent within the interior of the home for receiving cooled air therefrom. A hot air chamber is provided between the heating plate and the cover due to a greenhouse effect, and an air passageway provides communication between the cool air receiving chamber and the hot air chamber.

Abstract: This invention relates to method and apparatus used as an addition to any existing heating system--burning any fuel--for heat recovery from stacks and chimneys. It uses a suitable heat exchanger mounted at the apex of such stacks, by virtue of which location no natural draft is lost. The system includes a circulating pump, a thermostat, an expansion bottle, a condensate trough, a cap and dome which jointly serve to act as unloaders to protect the system liquid from being boiled off. Both sensible heat and the latent heats of moisture in the fuel and in the vapor produced as a combustion product, can be scrubbed out. The use is to effect economies and to reduce environmental contamination wherever fuels are fired.

Abstract: A heat exchanger comparising a shell attached at its open end to one side of a tube sheet and a detachable head connected to the other side of said tube sheet. The head is divided into a first and second chamber in fluid communication with a nozzle inlet and nozzle outlet, respectively, formed in said tube sheet. A tube bundle is mounted within said shell and is provided with inlets and outlets formed in said tube sheet in communication with said first and second chambers, respectively.