Heat Exchanger Comprising a Tubular Element and a Heat Transfer Element
Inactive Publication Date: 2012-08-09
LUVATA ESPOO OY
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- Abstract
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Benefits of technology
[0012]One advantage of the present invention is that the first surface of the tubular element is in line contact with the second surface of the heat transfer element because the contours of the second surface nest right on the internal tubular flow channels of the first surface. This continuous contact between the surfaces increases the total heat transfer area and thus improves the overall efficiency of the heat exchanger. A further advantage is that no thermally conductive medium needs to be used for bonding the two surfaces together.
[0013]The metal of the second surface at the location of the indentation sections may also be open or even removed by punching or cutting the metal. These openings in the top and bottom walls of the heat transfer element further improve the heat transfer between the tubular elements and the heat transfer elements. In one embodiment, the heat exchanger is characterised in that a portion of the second surface of the heat transfer element is open. In another embodiment, the heat exchanger is characterised in that the second surface has an opening at least one of the indentation sections.
[0014]In one embodiment, the heat exchanger is characterised in that the at least two internal tubular flow channels are connected by a flat region, or the channels are not connected to each other, or the channels are connected in a hairpin structure or in a serpentine structure. Another advantage of the new heat exchanger is that the design of the tubular element can be varied and adapted for different applications. These differences in designs have no adverse effects on the functioning of the heat exchanger.
[0015]In one embodiment, the flow direction of the second medium is substantially perpendicular to the longitudinal Y-axis. An arrangement of flow directions whereby the flow direction of the first medium is perpendicular to the flow direction of the second medium increases the heat transfer area and thus the efficiency of the heat exchanger.
[0016]The amount of heat transfer can be improved by further increasing the contact area between the first and second surfaces. This can for example be achieved by increasing the length of the tubular elements and heat transfer elements in a longitudinal direction along the longitudinal Y-axis. Alternatively, the amount of internal tubular flow channels per tubular element may be increased. Also, several tubular elements may be sandwiches between heat transfer elements along a vertical Z-axis. In a further embodiment, the heat exchanger comprises a plurality of parallel tubular elements separated by spaces along a vertical Z-axis, and a plurality of heat transfer elements provided in the spaces.
[0017]In yet a further embodiment, the heat transfer element comprises corrugated fins comprising
Problems solved by technology
A problem with the existing heat transfer elements is that the shape of the top and bottom walls is flat.
This significantly restricts energy transfer between the channels and the heat transfer elements and thus decreases the efficiency of the heat exchanger.
The lack of sufficient contact between the first surface of the tubular element and second surface of the heat transfer element makes it economically unattractive to use the heat exchanger in heating, ventilating, and air conditioning (HVAC-heat exchanger).
Method used
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[0044]A heat exchanger 1 according to the present invention comprises of two parts, a tubular element 2 and a heat transfer element 3. FIG. 1 shows a schematic overview of the tubular element 2. The tubular element 2 comprises of at least two internal tubular flow channels 4 extending along a longitudinal Y-axis
[0045]The internal tubular flow channels 4 are separated from one another by a region 5. The distance between the flow channels 4, i.e. the breadth of the region 5, is preferably the same between each flow channel 4.
[0046]The flow channels 4 together with region 5 between them form a first surface A of the heat exchanger 1. This first surface A has at least region 5 and at least two regular bulging sections 7. The region 5 may comprise of flat metal connecting the internal tubular flow channels 4 as shown in FIG. 1. Alternatively, the region 5 may be an opening between the internal tubular flow channels 4. The internal tubular flow channels 4 may not be connected as shown in ...
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Abstract
The present invention relates to a heat exchanger (1) comprising a first flow passage (6) comprising a tubular element (2) comprising at least two tubular flow channels (4) separated by region (5) extending along a longitudinal Y-axis, for passage of a first medium, and a second flow passage (8) for passage of a second medium between tubular element and a heat transfer element (3). The tubular element comprises a first surface (A) comprising at least region and two bulging sections (7). The heat transfer element comprises a second surface (B) comprising at least region 5′ and two indentation, cavity or nest sections (17). The first surface and the second surface are adapted to contact each other and have a complementary shape such that the bulging sections of the first surface are in continuous contact with the indentation, cavity or nest sections of the second surface.
Description
FIELD OF THE INVENTION[0001]The present invention refers to a heat exchanger according to the characterized portion of claim 1 and a use of the heat exchanger in apparatus such as heating, ventilating, and air conditioning in buildings, heat radiators in engines, computers, heat absorbers and / or industrial coolers such as equipment for cooling transformers and power generators.BACKGROUND OF THE INVENTION AND RELATED ART[0002]Heat exchangers are utilized in a broad range of applications where it is necessary to transfer heat to or from a particular item or equipment, such as an air condition unit, booster or engine.[0003]A heat exchanger generally comprises an arrangement of channels forming a first flow passage and a first surface. A heat exchanger is further pro-vided with a plurality of heat transfer elements such as corrugated fins along and extending traverse to the length of the channels forming a second flow passage, whereby the fins provide a second surface. When the heat exc...
Claims
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Login to View More IPC IPC(8): F28D7/00B21D53/02
CPCF28D1/0308F28F1/022Y10T29/4935F28F1/22F28F3/027F28F1/128
InventorGONG, YING
OwnerLUVATA ESPOO OY