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Title:
WELL COOLER
Document Type and Number:
WIPO Patent Application WO/1996/014551
Kind Code:
A1
Abstract:
A well cooler (4) for closed cooling systems on board vessels, such as ships (1) comprising at least one stack of pipes placed in a well cabinet (3) of a vessel, wherein a free space (7) is present between the inner wall of said well cabinet (3) and the outer sides of said stack(s) of pipes, wherein the pipes are fixed at both ends in headers, and which have a substantially elongated cross section, e.g. rectangular or elliptical, and at least one inlet port and one outlet port for medium to be cooled (5), wherein that flow guiding means are provided for directing cool sea water flowing along a side of a stack of pipes into said stack of pipes.

Inventors:
Meijers
Otto
Ary
Application Number:
PCT/NL1995/000378
Publication Date:
May 17, 1996
Filing Date:
November 03, 1995
Export Citation:
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Assignee:
Meijers
Otto
Ary
International Classes:
F28D1/053; F28F13/06; (IPC1-7): F28F13/06
Foreign References:
US1996499A1935-04-02
DE31455C
FR2385049A11978-10-20
FR2264262A11975-10-10
Other References:
PATENT ABSTRACTS OF JAPAN vol. 7, no. 177 (M - 233) 5 August 1983 (1983-08-05)
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Claims:
C L A I M S
1. Well cooler (4) for closed cooling systems on board vessels, such as ships (1), comprising at least one stack (10a to lOe) of pipes (lla;lib) placed in a well cabinet (3) of a vessel, wherein a free space (7) is present between te inner wall of said well cabinet and the outer sides of said stack(s) of pipes, wherein the pipes (lla;lib) are fixed at both ends in headers (13). and which have a substantially elongated cross section, e.g. rectangular or elliptical, and at least one inlet port and one outlet port for medium to be cooled, characterised in that flow guiding means (lla) are provided for directing cool sea water flowing along a side of a stack of pipes into said stack of pipes.
2. Well cooler according to claim 1, characterised in that the guiding means (lla) are arranged in the flow of cool water flowing upwards in the well cabinet (3) along the stack(s) (10a to lOe) of pipes (lla;lib) without passing through any stack of pipes.
3. Well cooler according to any of the preceding claims, characterised in that the lateral axis of the guiding means (lla) is arranged inclined with respect to the lateral axis of at least one neighbouring pipe (lib).
4. 3 Well cooler according to any of the preceding claims, characterised in that the lateral axis of the guiding means (lla) slope in the flow direction of the cool sea water flowing upwardly in the well cabinet (3) towards the stack(s) (10a to lOe) of pipes.
5. Well cooler according to any of the preceding claims, characterised in that the lateral axis of the guiding means (lla) is arranged inclined with respect to the lateral axis of at least one neighbouring pipe (lib).
6. 5 Well cooler according to any of the preceding claims, characterised in that the guiding means (lla) are arranged at least partially at the circumference of an inflow opening of the well cabinet (3).
7. Well cooler according to any of the preceding claims, characterised in that said guiding means are pipes (lla) through which may flow the medium that has to be cooled, wherein said pipes (lla) are placed at least partially at one or more sides of the stack(s) (10a to lOe) of pipes.
8. Well cooler according to any of the preceding claims, characterised in that pass partition plates (12) are provided for guiding the medium to be cooled through the stacks (10a to lOe) of pipes.
9. Well cooler according to any of the preceding claims, characterised in that two or more stacks (10a to lOe) of pipes are interconnected by their headers (13).
Description:
Well cooler .

Description

The present invention relates to a well cooler for closed cooling systems on board vessels, such as ships, comprising at least one stack of pipes placed in a well cabinet of a vessel, wherein a free space is present between te inner wall of said well cabinet and the outer sides of said stack(s) of pipes, wherein the pipes are fixed at both ends in headers, and which have a substantially elongated cross section, e.g. rectangular or elliptical, and at least one inlet port and one outlet port for medium to be cooled.

Well coolers of this type are well known. A well cooler is mounted in a so-called well cabinet. To enable sea water to flow through freely, said well cabinet has one or more inflow openings in the bottom of the vessel and outflow openings at the top in the hull of the vessel, just below the waterline. As a consequence of the sailing movement of the vessel, and in case of a stationary vessel, there is an upward flow of said cooling sea water in the well cabinet as a result of the thermal effect of the warming seawater. Hereby the medium to be cooled flowing through the pipes is cooled.

In conventional well cabinets water enters only along the underside of the stacks of pipes, which water will be further heated on its route upwards along each pipe. Hereby the thermal, cooling effect of the warming sea water decreases in upward direction.

Moreover, in order to achieve a counter current effect conventional well coolers comprise a feed line at the top and a discharge line at the bottom of the stacks of pipes. For returning the cooled medoum back to the top of the stacks of pipes a return line is present aside the stacks of pipes. This return line takes up a lot of space which then is not usable for placing cooling pipes.

The object of the invention is to provide a well cooler in which said decreasing cooling effect is reduced and in which some space saving is achieved. This object is achieved according to the invention by flow guiding means being provided for directing cool sea water flowing along a side of a stack of pipes into said stack of pipes. Hereby the inflow of cool, i.e. not yet warmed by the medium to be cooled, sea water is achieved over the full height of the stack of pipes. Now said cool sea water can

flow into the stack of pipes not only from underneath but from the sides of the stack of pipes also. Moreover, said inflow of cool sea water is enforced by the effect of the pipes being inclined, so that they guide the cool sea water into the stack of pipes and so that the total volume of cool sea water flowing into the stack of pipes per time unit is enlarged. Since cool sea water enters the stack of pipes at top level also, the conventionally decreased thermal, cooling effect of the warming sea water flowing in upward direction is improved by said cool sea water flowing into the stack of pipes mixing with said already warmed sea water flowing in the stack of pipes. The effective temperature difference (LMTD) will be greater, which increases the cooling capacity of the well cooler.

Structurally, there is no longer a need for the counter current effect, since in case of well coolers which have several passes through the pipes, the medium to be cooled can be guided through the stack of pipes by means of pass partition plates, as a result of which both said feed and said discharge lines may be omitted. Hereby limited available space is saved for applying more stacks of pipes rather than coupling means. According to another aspect of the invention the guiding means are arranged in the flow of cool water flowing upwards in the well cabinet along the stack(s) of pipes without passing through any stack of pipes. Hereby cool sea water is directed into the stacks of pipes rather than passing them useless in the free space between the inner wall of the well cabinet and the outer sides of the well cooler.

According to another aspect of the invention the lateral axis of the guiding means slope in the flow direction of the cool sea water flowing upwardly in the well cabinet towards the stack(s) of pipes. Preferably the guiding means catch as much of the cool sea water passing the sides of the well cooler at places where desired. Therefore the guiding means have to be arranged and probably placed inclined in an optimal position, which is described in terms of inclination and sloping direction in this invention. Advantagely, the lateral axis of the guiding means is arranged inclined with respect to the lateral axis of at least one neighbouring pipe.

According to another aspect of the invention the guiding means are arranged at least partially at the circumference of an inflow opening of the well cabinet. The guiding means may be arranged wherever appropriate. It has been found that good results may be achieved by arranging them at

least partially at the circumference.

Advantageously, the guiding means are pipes through which may flow the medium that has to be cooled. Then the guiding means have a function in cooling also rather than only directing the cool sea water into the stacks of pipes.

According to another aspect of the invention, pass partition plates are provided for guiding the medium to be cooled through the stacks of pipes.

The invention will be further elucidated referring to one preferred embodiment of the invention shown in the drawings, wherein:

Figure 1 shows part of a ship with a well cooler fitted in a well cabinet in the partially cross sectioned hull of said ship.

Figure 2 shows the ship of figure 1 partially in cross section.

Figure 3a shows the well cooler according to the invention in frontal view.

Figure 3b shows the well cooler according to figure 3a in side view.

Figure 4 shows in detail part of the well cooler according to the invention in cross section.

In figure 1 a ship 1 is shown comprising a hull 2 and a well cabinet 3 at part of the underside of said hull 2. Within the well cabinet 3 a well cooler 4 is fitted. This well cooler 4 is connected via lines 5 which lead medium to be cooled to and from the well cooler 4 and the engines 6 of the ship. Around the well cooler 4 free space 7 is present between the inner wall of the well cabinet 3 and the outer sides of the well cooler 4.

In figure 2 is shown the well cooler 4 fitted in the well cabinet 3, which well cooler 4 is surrounded by free space 7• Cool sea water flows from underneath the ship 1 into the well cabinet 3 due to the thermal effect already realised in the well cabinet 3- Further, said cool sea water passes through and along the well cooler 4 upwardly. The now warmed sea water leaves the well cabinet 3 via outlet passages 8 toward the side of the hull 2 of the ship 1 just below sea level 9-

In figure 3a the well cooler 4 according to the invention is shown in more detail. The well cooler 4 comprises at least one stack 10a to lOe of pipes. These pipes are fixed at both ends in headers 13. The feed and discharge lines 5 for the medium to be cooled are connected with the upper stacks of pipes. The several stacks of pipes are connected together. The stacks 10a to lOe comprise at least pipes lla at some of their sides (of which only the front is shown).

In figure 3b the well cooler 4 according to figure 3a is shown comprising five interconnected stacks 10a to lOe of pipes.

In figure 4 the invention is shown in more detail. The pipes lla having a rectangular cross section, are placed at the sides of each stack 10a and lOe of pipes lla and lib, and are provided for directing (see flow arrows) cool sea water flowing along a side of a stack of pipes into said stack of pipes. The lateral axis of the pipe lla is arranged inclined with respect to the lateral axis of at least one neighbouring pipe lib. The lateral axis of the pipe lla slopes in the flow direction of the cool sea water flowing (see flow arrows) upwardly in the well cabinet towards the stacks of pipes. The other pipes lib are arranged horizontally and/or vertically as is conventional. All of the stacks 10a to lOe are interconnected by their headers 13. Pass partition plates 12 separating the stacks 10a to lOe of pipes, are provided for guiding the medium to be cooled through these stacks of pipes.




 
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