Swep International Ab

Sven Andersson

Tomas Dahlberg

Svante Hoberg

Thomas Dahlberg

Fredrik Strömer

Niclas Bornegård

Hans Andre

Lars Fogelberg

Per Rissler

Belal Dawoud

Magnus Folkelid

Veikko Pihlajaniemi

Sven Karlsson

Dirk Sterner

Bengt-Ove S&auml;iner

Ulrich Vedder

Paris Chatzitakis

Jan Hertwig

Peter Kleem

Ake Narfgren

Hans AndrÉ

A double wall plate heat exchanger () comprising a plurality of double wall plate heat exchanger elements () formed with a ridges (R) and grooves (G) providing contact points between neighboring heat exchanger elements () under formation of flow channels between them for fluids to exchange heat. The flow channels are in selective fluid communication with each other through port openings. Each of the heat exchanger elements () comprises at least two joined plates and leakage channels are formed between the plates of each heat exchanger element () for fluid leaking from a flow channel. The plates are provided with cooperating elevations () and indentations () forming leakage channels () extending across the ridges and grooves between the plates of each heat exchanger element (). At least one connecting space is formed between the plates to connect the leakage channels within the same heat exchanger element (), and each of the connecting spaces is connected to a leakage outlet.

Double wall plate heat exchanger

The present application relates to a stencil device () for simultaneous stencil printing of brazing material onto elevations, areas surrounding port openings, and a circumferential skirt () of a heat exchanger plate () wherein the stencil device () comprises an upper stencil having openings for applying brazing material to elevations and areas surrounding port openings of the heat exchanger plate () and a lower stencil printing stencil () having a large opening () for receiving the heat exchanger plate () and contacting an outer perimeter of the circumferential skirt () of the heat exchanger plate (), wherein an inner surface () of the large opening () comprises brazing material exits () for applying brazing material to the circumferential skirts (). Disclosed is also a method of such stencil printing and also the use of a stencil device for applying heat exchanger plates () with a brazing material.

Stencil device and method for stencil printing of brazing material onto a heat exchanger plate and use thereof

A brazed plate heat exchanger () comprises an end plate () and a stack of heat exchanger plates (a,b) provided with a pattern comprising ridges (R) and grooves (G) adapted to form contact points () between neighboring heat exchanger plates such that the heat exchanger plates form interplate flow channels for media toexchange heat over the heat exchanger plates, the heat exchanger plates further being provided with port openings (O-O) for selective fluid communication with the flow channels, wherein the port openings are surrounded by port opening areas () for sealing against a corresponding port opening area of a neighbouring heat exchanger plate, wherein neighboring heat exchanger plates are connected by brazing joints at said contact points (), wherein the end plate () is provided with port openings (O-O) and flat areas () around the port openings in a common plane, wherein a plurality of ridges (R) of the heat exchanger plates, in an area overlapping any of said flat areas () of the end plate (), are formed with an indentation ().

Heat exchanger with indentations for avoiding stagnant media

A plate heat exchanger () includes a plurality of heat exchanger plates () provided with a pressed pattern adapted to provide contact points keeping the heat exchanger plates on a distance from one another such that interplate flow channels are formed between said plates, said heat exchanger being provided with interplate flow 5 channels (--) for a first medium exchanging heat with a second medium in interplate flow channels (-) and a third medium in interplate flow channels (-), wherein the interplate flow channels are in selective fluid communication with port openings () for the first medium, the second medium and the third medium. The heat exchanger () comprises first and second integrated suction gas heat exchanger sections (ISGHX, ISGHX) provided in the vicinity of port openings () for the second medium and third medium. Every other heat exchanger plate is formed with a pressed first pattern of ridges and grooves, and the other heat exchanger plates are formed with a pressed second pattern of ridges and grooves, wherein the first pattern of ridges and grooves is different from 15 the second pattern of ridges and grooves.

Plate heat exchanger

A refrigeration system includes a compressor for compressing a gaseous refrigerant, such that the temperature and pressure thereof increases; a four-way valve controlling whether the refrigeration system is in a heating mode or a cooling mode; a condenser, in which the gaseous refrigerant from the compressor exchanges heat with a high temperature heat carrier, said heat exchange resulting in the refrigerant condensing; an expansion valve reducing the pressure of liquid refrigerant from the condenser, hence reducing the boiling point of the refrigerant; an evaporator, in which the low boiling point refrigerant exchanges heat with a low temperature heat carrier, such that the refrigerant vaporizes; and a suction gas heat exchanger exchanging heat between high temperature liquid refrigerant from the condenser and low temperature gaseous refrigerant from the evaporator. A balance valve is arranged for controlling the amount of heat exchange between the high temperature liquid refrigerant and the low temperature gaseous refrigerant in the suction gas heat exchanger by directing a flow of high temperature liquid refrigerant directly from the condenser to the expansion valve. Disclosed is also a method for controlling such a system.

Refrigeration system and a method for controlling such a refrigeration system

A brazed plate heat exchanger () for exchanging heat between at least two fluids comprises several elongate heat exchanger plates () provided with a pressed pattern comprising depressions and elevations adapted to keep the plates on a distance from one another by contact points between the elevations and depressions of neighboring plates under formation of interplate flow channels for media to exchange heat. At least four port openings are placed in corner regions of the elongate heat exchanger plates and have selective fluid communication with the interplate flow channels such that the fluids to exchange heat will flow between port openings parallel to long sides of the elongate heat exchanger plates. A circumferential seal sealing off the interplate flow channels from communication with the surroundings is provided, and the heat exchanger plates are joined by brazing. The circumferential seal results partly from contact between skirts of neighboring plates contacting one another, said skirts extending at least partly along two sides of each heat exchanger plates, and partly from contact between flat areas extending along two other sides of the heat exchanger plates.

Heat exchanger

A brazed plate heat exchanger comprises a number of heat exchanger plates () provided with a pressed pattern comprising ridges (R) and grooves (G). The ridges and grooves of neighboring plates contact one another in order to keep the plates on a distance from one another under formation of interplate flow channels for media to exchange heat when the heat exchanger plates are placed in a stack to form the heat exchanger. Means () are provided for allowing temperature measurement of a fluid present in a second flow channel counted from an end of the stack of heat exchanger plates ().

Means for sensing temperature

A plate heat exchanger without straight flow channels is provided, for exchanging heat between fluids. Said heat exchanger, comprises a start plate, an end plate and a number of heat exchanger plates provided with a pressed pattern of ridges and grooves with a pitch. The heat exchanger plates are kept at a distance from each other by contact between ridges and grooves of neighboring plates in contact points, when said plates are being stacked onto one another. Flow channels are thus formed between said plates, the contact points are positioned so that no straight lines are formed along the length of the heat exchanger plates.

Heat exchanging plate with varying pitch

A reversible refrigeration system including a compressor arranged to compress gaseous refrigerant, a four-way valve switchable between a heating position in which a payload is heated and a cooling position in which the payload is cooled. A payload heat exchanger is connected to the payload requiring heating or cooling, and a dump heat exchanger, two one-way valves, and two controllable expansion valves as well, wherein the one-way valves each are connected parallel to a corresponding expansion valve, wherein switching of the four-way valve between the heating position and the cooling position controls a flow of pressurized refrigerant to either of the payload heat exchanger or the dump heat exchanger and wherein the heat exchanger which receives the flow of pressurized refrigerant functions as a condenser and the other heat exchanger functions as an evaporator.

Refrigeration system

A method for producing a brazed plate heat exchanger comprising a stack of heat exchanger plates provided with a pressed pattern adapted to provide contact points between neighboring heat exchanger plates, such that the heat exchanger plates are kept on a distance from one another under formation of interplate flow channels for media to exchange heat, wherein the interplate flow channels are in selective communication with port openings for the media to exchange heat and circumferentially sealed along an outer periphery in order to avoid external leakage, comprises the following method steps: a. Calculating the position of the contact points between neighboring plates; b. Calculating a force that must be transferred by each contact point when the heat exchanger is in use; c. Based on the method steps above, calculating a necessary amount of brazing material for each contact point; d. Providing a screen for screen printing the brazing material onto the heat exchanger plates, wherein the screen is provided with openings, the size, position, plate thickness and shape of which being adapted to provide the necessary amount of brazing material to each contact point; e. Screen printing the heat exchanger plates with brazing material using the screen; f. Stacking the heat exchanger plates in a stack; and g. Brazing the stack of the heat exchanger plates in order to join the plates together to form the heat exchanger.

Method for producing a brazed plate heat exchanger

A brazed plate heat exchanger () comprises a number of heat exchanger plates (--) provided with a pressed pattern of ridges (R) and grooves (G) adapted to keep the plates on a distance from one another by providing contact points between crossing ridges (R) and grooves (G) of neighbouring plates under formation of interplate flow channels for media to exchange heat, said interplate flow channels being in selective fluid communication with first, second, third and fourth large port openings (OOOO) and first and second small port openings (SOSO) for letting in fluids to exchange heat, characterized in that fluid passing between the first and second large port openings (OO) exchanges heat with fluids passing between third and fourth port openings (OO) over a first heat exchanging portion of each plate and fluid passing between the first and second small port openings (SOSO) over a second portion of each plate.

Heat exchanger having an integrated suction gas heat exchanger

A heat exchanger comprises a number of identical heat exchanger plates stacked in a stack. Every other heat exchanger plate is turned 180 degrees in its plane relative to its neighboring plates, and each heat exchanger plate comprises at least four port openings and a herringbone pattern comprising pressed ridges and grooves. The ridges and grooves are adapted to keep the plates on a distance from one another under formation of flow channels, wherein areas around the port openings are arranged on different levels, such that selective flow from the port openings to the flow channels is achieved. Dents are arranged in the ridges and grooves in the vicinity of any of the port openings, the dents being arranged to increase the flow resistance to promote a more even flow distribution in the flow channel.

Heat exchanger with improved flow

A plate heat exchanger () comprises a number of plates () provided with a pressed pattern of ridges (R) and grooves (G) arranged to keep the plates () on a distance from one another under formation of interplate flow channels for media to exchange heat. The interplate flow channels communicate with port openings (A, B, C,) being in selective communication with said interplate flow channels, one of the port openings () providing for connection to a downstream side of an expansion valve (EXP) such that coolant from the expansion valve (EXP) may enter the interplate flow channels communicating with the one port opening (). A heat exchanging means (; HEP, LC, DP) is provided inside the one port opening (), said heat exchanging means (; HEP, LC, DP) being arranged for exchanging heat between coolant downstream the expansion valve (EXP) and coolant about to enter the expansion valve (EXP).

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Hässleholm, Sweden

Sven Andersson