EP0311794B1 - Rieselgitter für Wasserkühltürme - Google Patents

Rieselgitter für Wasserkühltürme Download PDF

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Publication number
EP0311794B1
EP0311794B1 EP88114856A EP88114856A EP0311794B1 EP 0311794 B1 EP0311794 B1 EP 0311794B1 EP 88114856 A EP88114856 A EP 88114856A EP 88114856 A EP88114856 A EP 88114856A EP 0311794 B1 EP0311794 B1 EP 0311794B1
Authority
EP
European Patent Office
Prior art keywords
grid
packing
grids
water cooling
strips
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88114856A
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English (en)
French (fr)
Other versions
EP0311794A1 (de
Inventor
Antonio Mosiewicz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SPIG INTERNATIONAL per Impianti Generali SpA Soc
Original Assignee
SPIG INTERNATIONAL per Impianti Generali SpA Soc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SPIG INTERNATIONAL per Impianti Generali SpA Soc filed Critical SPIG INTERNATIONAL per Impianti Generali SpA Soc
Priority to AT88114856T priority Critical patent/ATE75846T1/de
Publication of EP0311794A1 publication Critical patent/EP0311794A1/de
Application granted granted Critical
Publication of EP0311794B1 publication Critical patent/EP0311794B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F25/00—Component parts of trickle coolers
    • F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
    • F28F25/08—Splashing boards or grids, e.g. for converting liquid sprays into liquid films; Elements or beds for increasing the area of the contact surface
    • F28F25/085—Substantially horizontal grids; Blocks

Definitions

  • This invention relates to a horizontally disposed packing for a water cooling tower according to the precharacterising part of claim 1.
  • a packing is known from DE-A-1 751 940. It consists of a vertically disposed chamber through which the liquid descends by gravity from the top to the bottom to split into minute, droplets by its impact against the packing material, whereas the gas flows through the chamber from the bottom upwards to thus countercurrently encounter the descending liquid subdivided into minute droplets. Alternatively, the gas can flow through the containing chamber horizontally (cross flow).
  • the packings for cooling towers disclosed by FR-A-2.128.146 consist of a structure having a large surface to promote the contact between liquid phase (water) and gas phase (air): such structure is formed by assembling large bands elements and are rather expensive when applied to cooling tower of large size.
  • the cooling gas is air in an open circuit; the air flowing through the tower either by natural draught or by forced draught obtained by a suction fan or blower.
  • thermoplastic synthetic polymers such as polypropylene, polyethylene, polystyrene and polyester and vinyl resins are suitable.
  • the characteristics of these materials are excellent for application in this field because of their inalterability, lightness combined with a certain mechanical strength, and simplicity and economy in manufacturing the grid, particularly by injection moulding.
  • Grids of this type have a structure consisting of rectangular or square cells of various dimensions, and may he provided with reinforcement strips (ribs) if the slate which delimit the individual cells are very thin and of unsuitable shape to give the grid the necessary mechanical strength and dimensional rigidity.
  • the amount of the horizontal cross-section which is occupied by the slate defining the individual cells plus the reinforcement ribs must be kept within optimised limits as a fraction of the empty air flow passage section.
  • the pressure drop in the ascending air flow must be kept within very low values whereas on the other hand the total solid cross-section must be sufficient to provide an adequate impact surface for the water in free fall from above.
  • the grids disposed one above another along the vertical axis are staggered relative to each other and are suitably spaced apart vertically.
  • the grid according to the invention can be constructed of a thermoplastic material suitable for injection moulding. Particularly suitable materials are polypropylene, polyethylene and various vinyl polymers.
  • the grid has a square outer periphery of standard side dimensions so that it can also be installed in existing cooling towers.
  • FIG. 1 The grid according to the invention, shown schematically in Figure 1, is installed horizontally.
  • Figure 2 is a detailed partial view of the honeycomb structure with its reinforcement ribs.
  • the horizontal section through the strips forming the contours of the hexagonal cells plus the horizontal section through the reinforcement ribs represents the solid surface, ie the impact surface against which the the water droplets collide during their free gravity fall from above.
  • the optimum area of this solid surface is between 20% and 30%, and preferably of the order of 25%, of the total grid area.
  • the optimum side lengths of the hexagonal cells are of the order of 3-4 cm. This means that there are no individual flat sections (strips) or reinforcement ribs of considerable size which could result in troublesome liquid accumulation.
  • the optimum condition is for the impact surfaces to be as free as possible of stagnant liquid which would reduce the splashing effect during the droplet impact against them.
  • the width of the strips and of the reinforcement ribs therefore does not exceed 6 mm and is preferably between 3 and 5 mm.
  • the configuration and position of the hexagonal cells in the grid is not symmetrical about the vertical axis passing through its centre. In this manner by mounting the grids one on another in the tower with each grid rotated through 90° about the preceding grid, the solid elements (strips, ribs) are given the necessary offsetting with respect to the preceding grid.
  • An important structural parameter is the distance in the direction of the tower vertical axis between one grid and the next. This distance is between 10 and 40 cm and is preferably of the order of 20 cm for the type of grid according to the invention.
  • the pressure drop can be kept equal to or lower than the pressure drop obtained with rectangular or square cells of much larger dimensions but of consequent less heat transfer efficiency.
  • each hexagon vertex is a point of convergence of only three segments with vertex angles (or segment convergence angles) of 120°, whereas in the case of known grids with square or rectangular cells four segments converge with a convergence angle of 90°.
  • the reinforcement ribs of the grid according to the invention are disposed generally in the form of a rectangular lattice. They necessarily create conditions of reduced efficiency because they form convergence points for four segments and convergence angles of 120°, 90° and 60° as shown in Figure 1.
  • reinforcement ribs required for the hexagonal honeycomb structure according to the invention are generally sufficiently spaced apart from each other to not compromise the excellent characteristics of the structure.
  • FIGs of Figures 3 and 4 show operating data obtained for a water cooling tower packed with packing grids according to the invention, together with comparison data for the same tower under the same operating conditions but packed with grids of known type.
  • the grid according to the invention has the structure shown in Figures 1 and 2 with a hexagon side of 35 mm, a distance 1 of 155 mm, a distance 1′ of 145 mm, a strip thickness s of 4 mm, a reinforcement rib thickness s of 4 mm, and a grid size excluding the support edge of 612 x 612 mm.
  • the grid of known type is shown diagrammatically in Figure 5, and comprises rectangular cells of inner dimensions 190 x 60 mm and a strip width of 12 mm.
  • the vertical axis represents the heat transfer efficiency expressed in kaV/L and the horizontal axis represents the air flow velocity.
  • the line B refers to the grid of the invention and the line A refers to the grid of known type. The better efficiency of the grid according to the invention appears at all air flow velocities.
  • the grid according to the invention also behaves as well as or better than the grid of known type from this aspect.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Baking, Grill, Roasting (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Control Of Eletrric Generators (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (3)

  1. Waagerecht aufgestellte Packung für eine gegenstrom Wasserkühlturm mit aufsteigender Luftströmung oder Querdurchfluss-Strömung mit einem orthogonalen Fluss, welche einen viereckigen Umfang aufweist, und bestehend aus Gittern mit einer netz- zellen-artigen Struktur, in welcher die Kontur der hexagonalen Gitterzellen aus Leisten besteht, dadurch gekennzeichnet, dass
    - das Packungsgitter mit Verstärkungsrippen versehen ist;
    - die Leisten und Rippen eine Breite in dem waagerechten Ebene nicht höher als 6 mm und nicht niedriger als 3 mm aufweisen;
    - die Rippen- und Leisten-Querschnittfläche in diesem Ebene zwischen 20 und 30 % der gesamten Querschnittfläche des Gitters aufmacht;
    - die hexagonale Zellen eine Seitenlänge zwischen 30 und 40 mm besitzen;
    - ein Gitter von dem nächsten 100 bis 400 mm entfernt ist, und dass
    - die Zellen der netz- und zellenartigen Struktur asymmetrisch um der senkrechten Packungsachse aufgestellt sind durch Aufstellung der Gittern übereinander in der Turm, und mit jedem Gitter um 90° um den vorstehendem Gitter umgedreht.
  2. Packung für eine Wasserkühlturm gemäss Anspruch 1, dadurch gekennzeichnet, dass die Verstärkungsrippen und die Leisten welche die Kontur der hexagonalen Zellen aufmachen eine Breite zwischen 3 und 5 mm aufweisen.
  3. Packung für eine Wasserkühlturm gemäss Anspruch 1, dadurch gekennzeichnet, dass jedes Gitter von dem nächsten ungefähr 200 mm entfernt ist.
EP88114856A 1987-10-13 1988-09-12 Rieselgitter für Wasserkühltürme Expired - Lifetime EP0311794B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88114856T ATE75846T1 (de) 1987-10-13 1988-09-12 Rieselgitter fuer wasserkuehltuerme.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT22239/87A IT1222883B (it) 1987-10-13 1987-10-13 Griglia di riempimento per torri di raffreddamento acqua
IT2223987 1987-10-13

Publications (2)

Publication Number Publication Date
EP0311794A1 EP0311794A1 (de) 1989-04-19
EP0311794B1 true EP0311794B1 (de) 1992-05-06

Family

ID=11193519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88114856A Expired - Lifetime EP0311794B1 (de) 1987-10-13 1988-09-12 Rieselgitter für Wasserkühltürme

Country Status (5)

Country Link
EP (1) EP0311794B1 (de)
AT (1) ATE75846T1 (de)
DE (1) DE3870795D1 (de)
ES (1) ES2031199T3 (de)
IT (1) IT1222883B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT221692Z2 (it) * 1991-03-13 1994-09-13 Spig Int Griglia di riempimento per torri di raffreddamento acqua

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1751940B2 (de) * 1968-08-22 1971-04-29 Gitterverband fuer den einbau in fluessigkeitsrueckkuehl anlagen insbesondere zur kuehlung von wasser
FR2128146A1 (en) * 1971-03-08 1972-10-20 Cem Comp Electro Mec Heat exchanger tower - packing of honeycomb cross-section extrusions in plastics material
NO132704C (de) * 1973-04-10 1975-12-17 Norsk Hydro As

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Heat exchanger design handbook, Hemisphere Publishing Corporation, 1983, Section 3.12.2 *

Also Published As

Publication number Publication date
IT8722239A0 (it) 1987-10-13
DE3870795D1 (de) 1992-06-11
IT1222883B (it) 1990-09-12
ES2031199T3 (es) 1992-12-01
EP0311794A1 (de) 1989-04-19
ATE75846T1 (de) 1992-05-15

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