DE1501600A1 - Method and device for heat exchange - Google Patents

Description

• in / a> The invention relates to / ancestors and / Voτrich-

device for exchanging heat between one contained in a pipe and the liquid or gaseous medium flowing through it and a liquid that is present outside the pipe or gaseous medium.

According to a simple and generally known way of working to achieve heat exchange between a flowable Medium, e.g. a liquid that is contained in a pipe and through which it flows, and a liquid or a mixture of liquid and vapor outside the tube, the latter is left in contact with the tube Flow outside of the pipe. In practice, an upright series of pipes is usually used through which the heat exchange medium flows, such tubes

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are usually arranged horizontally. The external liquid flows downwards over each subsequent pipe, becomes on Collected at the bottom of the arrangement or row and can be returned to the circuit by pump devices, devices are usually provided here, what gases or vapors can be withdrawn through this series of pipes.

The object of the invention is to create a new one A method and a new apparatus for carrying out such a heat exchange with greater efficiency.

According to the invention, a device for heat transfer is provided which has a plurality of essentially horizontal tubes arranged one above the other in a with respect to the horizontal inclined plane, a rigid sieve or grid plate or a sieve plate (mesh sheet), which in immediate height of the tubes and is arranged essentially in a plane parallel thereto, a device for supplying a heating or cooling medium to the tubes and through this · hinduroh, a «facility for the acquisition of a Qm or steam flow from below the sieve or grid plate or the sieve plate to pass through this, a device for the extraction of gas or steam tfetr djt ms Pipes wddea sieve or Gttterbledi extensive anontaung and a Sin -richtung for the supply of a liquid to the arrangement

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tion outside the hollow and / or for collecting a liquid from this arrangement outside of the pipes

It can be seen that since the Hohr and Sieve orders are arranged in a plane inclined to the horizontal, the terms "below" and "above" respectively places within the acute angle and the obtuse angle, which are opposite to each other due to the arrangement opposite the horizontal, represent. Accordingly, an ia-s or steam flow from below the arrangement can actually be a horizontal stream through the arrangement. For most purposes it is preferred that the sieve or grid plate · under the Pipe arrangement lies.

The basic or pattern device just referred to can be used for a wide variety of purposes. In general, it is used in operations in which a liquid medium is supplied outside the pipes in such a way that it flows down the sieve or grid plate in such cases Working methods, the effect of the sieve plate is based on a spread of the applied or supplied liquid, with the steam or gas flow then serving to atomize or spray the liquid from the sieve plate onto the pipes (where the heat exchange takes place). The liquid transferred onto the tubes in this way flows down the tubes and is conveniently collected at the lowest point of the arrangement · 909844/0647

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Examples of such operations are as follows Embodiments according to the invention;

(a) The device is used as a condenser or evaporative cooler used · In this case the gaseous or liquid medium to be cooled is passed through the Pipes flow while a cooling liquid is supplied to flow down the sieve plate and vm there onto the pipe to be convicted.

(b) The device is used as a sprinkler or lighting device or vaporizer used. In this case, a heating medium is allowed to flow through the tubes while the liquid to be evaporated is fed in to flow down the sieve plate and from there transferred to the pipes to become.

(c) The device is used as a device for removing moisture or vapors (de-humitifier or de-vapouriser) used. In this case, a cooling medium is allowed to flow through the bore while a suitable drying or drying process is carried out Vapor-freeing (de-huaidifying or de-vapourising) Liquid, for example an aqueous calcium chloride solution, is supplied to flow down the sieve plate and from there to be transferred to the pipes.

(d). The device is used as a vapor or gas absorber * In this case, a cooling medium is let through the pipes

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flow and a Daxpf or gas absorbing liquid (i.e. a liquid having high heat absorption properties) is supplied to flow through the screen plate and from there to be transferred to the pipes.

a weather-wise use of the above-described device, the medium applied from the outside to the Ivohre can consist of a condensable vapor, wherein a cooling medium is drawn through the pipes. In this The condensable Dau;? F may be mixed with the case Gas or steam flow, which is supplied from below the sieve plate, are used. The condensable Steam condenses on the pipes and flows from there down the pipes or down the thief plate to the deepest Point of arrangement to be wholesaled

It has been found that in all of the various applications of the device according to the invention, essential and important advantages can be achieved. In particular, compared with the usual working methods and devices causes a considerable increase in the amount of heat transfer between the two parts for given flow rates and conditions, resulting in an increase the effectiveness of the heat exchange leads

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In addition, by the device according to the invention a much more complete "humidification or Wetting "of the pipe arrangement is achieved for a given extent of flow or an even flow velocity of the external liquid, which not only supports the heat transfer but also prevents" dry spots "on the pipes. This in turn reduces the extent of the flow Deposits deposited or separated on the pipes (Crusts, scale), which leads to an increase in the life or use of the pipe and to a reduction in the Maintenance costs leads

A further advantage of the device according to the invention is based on the fact that given a given "wetting or Humidification "of the pipe arrangement or row of pipes, a significantly lower flow rate of the external liquid is sufficient wodx ^ ch throws the energy expenditure reduced.

A particular embodiment of the device according to of the invention is explained in more detail below with reference to the drawing the drawing explained in schematiecher Sarstellung an embodiment of the device geu.aH of the invention, the ftv's use as an evaporative cooler is provided.

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The device shown in the drawing comprises • in «chamber 1, within which a series of interconnected, inclined, horizontal tubes 2 are arranged, which are optionally equipped with ladial ribs. This suitably consists of a metal sheet or a plastic plate, for example a so-called a sheet or web-shaped material. "Expanded or extended ¹¹ metal or an analogously formed sheet au""ine" synthetic plastic · Preferably, to di · sieve or grid plate a "such Orientation have that the surfaces of the strands are inclined to the horizontal, with the longer axes of the openings being essentially parallel to the axes of the tubes Liquid can fall onto plates 5, for example made of metal or plastic, which are arranged in such a way that the liquid flowing off from them falls onto the respective sieve plates Its drilling line 7 tuad a pump 8 connect this container with the textile * trough 4 · Another pipe Line 9 is provided for the supply of liquid to the vessel 6.

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In a wall of the chamber 1 _a of the show bus lined lb · 2 and the perforated plates 3, an air inlet and 1C provided at the upper end of a Kamner 1 Austrittsgebläee (• exhaust fan) 11 is attached. A vapor or moisture collection device 12 is arranged above the chamber above the heaters 2 and the sieve plates 3. A drain 13 is provided at the bottom of the chamber *.

The method for operating the device just described according to the invention ale evaporative cooler or -Capacitor is as follows:

The steam to be condensed enters the rows of inclined, horizontal pipes at the top and the condensate leaves the pipes at the lower end. Cooling is effected by the evaporation of water from the distribution troughs 4 over the loading / focus plates 5 »over the edge the sieve plates 3 grip, flows and these plates 3 run down · From these, however, the water is under the effect of the blower Il lifted, dae through the inlet 10 and through the sieve plates 3 pulls air into the chamber 1. That so from the grille or water expelled from it hits the * Surfaces of the pipes and its subsequent evaporation therefrom cools the vapors in the pipes. The passing of atomized or sprayed material from the chamber is sprayed by attaching the vapor separator or remover 12.

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The water slowly flows down the inclined row of pipes and finally collects in the vessel <5 _t from where 4s is returned to the distribution troughs 4 by means of the pump 9. Additional water is fed to the vessel 6 via the line 9 To replace water losses due to spray or pest loss, evaporation loss and drainage loss. A drain 13 is provided at the bottom of the chamber for the removal of the latter.

To explain the use of the device according to the invention, the following details are referred to indicated on the device shown in the drawing: drilling

Dimensions of the drilling:

Drilling distance: No. of drilling rows: Material: Mesh plate expanded metal:

Inclination of the drilling rows: (un / 1 de ** expanded metal) Water speed inside the drilling

Core or base diameter

15.87 mm (5/8 inch)

Outside Euro hats of ribs 19.05 mm (3Λ inch;

19 ribs J 2.54 em (1 inch each) 31.75 mm (1 1 / * inch) 2 marine brass (admiralty brass)

1.587 mm (1/16 inch) strand width 3.175 mm (1/8 ine) opening width 30 ° from the horizontal

1.22 m / oek. (4 ft./sec.)

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Water flow outside the

Pipes: 1180 kg / hour each 0.3 m pipe length

per row (2600 lb / hr. per ft. length of tubes per row)

Air speed at the

Front surface: 2.28 m / sec. (7.5 ft / sec.)

With a mean Heiuwast orteniperjitur within the pipes of about 46 ⁰ C (315 ⁰ F) and an air supply with a wet heat level of about 18.3 ⁰ O (65 ⁰ P) exceeded the total heat transfer coefficient, based on the core area of the drill and the effective temperature difference between the wet heat level of the air and the water temperature within the range 50.4 kcal / hour. 0.09 m ^2. ° P (200 Btu / hr. F t. ² ° ϊ5.

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Claims (1)

Claims Device for heat exchange, characterized in that that they have a plurality of essentially horizontal ones, side by side in one inclined to the horizontal Pipes (2) arranged level, one in the immediate vicinity Rigid sieve plate (3) attached to these pipes and lying in a plane essentially parallel to them, a device for supplying a heating or cooling medium to and through the pipe, a device (10) for the Supply of a GaB or vapor atom from below the Siebplatte · sub passage through the sieve plate, a device for drawing off gas or steam (11) above the drilling and sieve plate assembly and means for supplying a liquid to the assembly external to the tubes and / or for collecting a liquid from this arrangement (6,7,6,9), 2. Device according to claim 1, characterized in that that the sieve is attached below the pipe arrangement (2). 3. Performing according to claim 1 or 2, characterized in that that the sieve (3) is oriented relative to the pipe arrangement in such a way » C * trand) that the surfaces of the strands incline towards the horizontal " where the major axes of the openings are essentially parallel to the axes of the tubes 9098U / 0647 bath .Method for heat exchange using the device according to one of claims 1 to 3, characterized! that there is a heat exchange between two fluid gene or gaseous media of different temperatures man Caused by / the one medium outside the pipes under Downward flow on the sieve plates, whereby a gas or vapor flow causes atomization or spraying of this medium onto the tubes, and. the second medium through the Pipes leads. 5 «Method according to claim 4 _f characterized in that, while a coolant di · screen plate flows down and enters a cooling · to liquid or passes gas to be cooled through the tubes from there to the tubes. 6. The method according to claim 4, characterized in that an Eelsaedium is passed through the tubes and a liquid to be evaporated is supplied which flows down over the sieve plate and is transferred from there to the drill. 7v method according to claim 4, characterized in that daft a cooling medium is passed through the tubes, while a moisture-releasing liquid flowing down over the sieve plate and over- guide is fed to the pipes 90MU / 0647 8. The method according to claim 4-, characterized in that one runs a cooling liquid through the pipes and a condensable one Steam, possibly mixed with the gas or steam flow fed in from below the sieve plates, from below the sieve plate to the pipes. 909844/0647 Blank page