Heat exchange – Three non-communicating fluids
Patent
1999-11-05
2000-12-26
Leo, Leonard
Heat exchange
Three non-communicating fluids
165167, F28F 308
Patent
active
061643718
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention refers to a plate heat exchanger for three heat exchanging fluids which heat exchanger comprises at least one core of plates with heat exchanging plates, at least two end plates and inlets and outlets for the heat exchanging fluids. The invention also refers to a plate heat exchanger for refrigeration applications.
BACKGROUND OF THE INVENTION
Plate heat exchangers for three heat exchanging fluids have many potential fields of application. They may for example be used as evaporators for evaporation of refrigerants flowing in refrigeration systems. Such a refrigeration system normally includes a compressor, a condenser, an expansion valve and an evaporator. A plate heat exchanger used as an evaporator in a system of this kind often has heat exchanging plates that are welded or brazed together, but also packings may be used for sealing between the heat transferring plates.
U.S. Pat. No. 5,462,113 shows a plate heat exchanger with flow passages for three different fluids between the plates. The delivery of the three fluids to the core of plates is done in such a way that passages for the number one fluid are present on both sides of every passage for each one of the two remaining fluids. In a preferred embodiment the passages are created using two different kinds of plates. Good sealing between adjacent plates at the openings creating the inlet and outlet channels for the three fluids is created by designing the areas around the ports thereby defining a system with annular planar plateaus.
The design of the heat exchanger for three heat exchanging fluids gives the possibility of flexible operational solutions in connection with part load. The heat transfer is however not maximal effective.
SUMMARY OF THE INVENTION
The purpose of the invention is to create a more effective heat exchanger for three fluids. Thus the invention comprises a plate heat exchanger for three heat exchanging fluids, which heat exchanger comprises at least one core of plates with heat exchanging plates, at least two end plates and inlets and outlets for the heat exchanging fluids. Each one of the heat exchanging plates is provided with six port holes creating one inlet channel and one outlet channel through the core of plates for each one of the fluids and where the channels for one fluid are in fluid communication with every other plate interspace and the channels for each one of the remaining two fluids are in alternating fluid communication with every other one of the remaining plate interspaces.
Each one of the heat exchanging plates is provided with a central heat transfer part with one or several corrugations vertically extending within an area restricted by two parallel first and second planes, respectively, placed at a distance from each other, together creating the thickness restriction of the plate and both mainly in parallel with all plates in the core of plates as well as the end plates of the plate heat exchanger. The first plane is closer to a first end plate in one end of the heat exchanger than the second plane is and the second plane is closer to a second end plate in the other end of the heat exchanger than the first plane is.
The heat exchanging plates are present in four different forms of execution alternating within the core of plates. Thereby a plate of the first form of execution is mounted close to a plate of a second form of execution and a plate of a fourth form of execution. A plate of the second form of execution is mounted close to a plate of a third form of execution and a plate of the first form of execution. A plate of the third form of execution is mounted close to a plate of the fourth form of execution and a plate of the second form of execution. Finally, a plate of the fourth form of execution is mounted close to a plate of the first form of execution and a plate of the third form of execution.
The port holes are pairwise aimed at the flowing through of the heat exchanging fluids respectively where the port holes in every such pair are situated on bot
REFERENCES:
patent: 448521 (1891-03-01), Horner
patent: 2617634 (1952-11-01), Jendrassik
patent: 3117624 (1964-01-01), Wennerberg
patent: 3404733 (1968-10-01), Pottharst, Jr.
patent: 3532161 (1970-10-01), Lockel
patent: 5462113 (1995-10-01), Wand
patent: 5924484 (1999-07-01), Andersson et al.
Bertilsson Klas
Blomgren Ralf
Lindholm Ingvar
Stenhede Claes
Alfa Laval AB
Leo Leonard
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