Hybrid dry cooler heat exchange with water-droplet slit and water-droplet splitting louver for heat exchangers with primarily latent heat transfer

a technology of heat exchangers and dry coolers, which is applied in the direction of trickle coolers, stationary conduit assemblies, tubular elements, etc., can solve the problems of significant increase in the surface wet with water and noticeable increase in the latent heat transfer through evaporation, so as to improve the efficiency of mass transfer during wetting, increase the percentage of wetted surfaces relative to the entire heat exchange surface, and improve the effect of cooling capacity

Inactive Publication Date: 2008-02-21
JAEGGIGUNTNER SCHWEIZ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]Further objects are that the percentage of the wetted surface relative to the entire heat exchange surface be increased, the efficiency in the mass transfer during wetting be improved, the cooling capacity be considerably enhanced, eddies causing noises over the entire air loading range cannot occur, that drying operating be extended due to higher air loading and higher cooling ranges without impermissible thermal tensions and without visible post-condensation (most formation) become feasible.

Problems solved by technology

With smooth fins, the droplets unavoidably produced when wetting the fins with excess water are held suspended between the fins by the tube effect of the air stream, and are carried out as a result of excessively high surface tension.
This filmy wetting inevitably leads to a major increase in the surface wet with water, and therefore to a noticeable increase in the latent heat transfer through evaporation.

Method used

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  • Hybrid dry cooler heat exchange with water-droplet slit and water-droplet splitting louver for heat exchangers with primarily latent heat transfer
  • Hybrid dry cooler heat exchange with water-droplet slit and water-droplet splitting louver for heat exchangers with primarily latent heat transfer
  • Hybrid dry cooler heat exchange with water-droplet slit and water-droplet splitting louver for heat exchangers with primarily latent heat transfer

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Embodiment Construction

[0028]FIG. 1 shows a hybrid heat exchanger 1 with several tubes 2 which run parallel to each other and are arranged at a selected distance from each other. The tubes 2 are positioned horizontally. The tubes 2 begin and end in so-called collectors, not shown in FIG. 1. A liquid flows inside the tubes 2. The temperature of the liquid which must lie above that of the wet-bulb temperature of the surrounding air.

[0029]Along the reach of the fin depth in the air flow direction 3,8, the tubes 2 may be arranged behind each other or preferably offset. In accordance with the number of tube rows, the liquid can flow through the heat exchanger one to several times.

[0030]The feed 6 of the wetting water 7 is located above the upper face 4 of the fins 5. A larger quantity of this water is output than can evaporate in the air stream 8. The excess wetting water 9 is collected in a catch bowl 10 and recirculated via a pump 11.

[0031]In accordance with the preferred embodiment, the heat exchanger 1 is ...

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Abstract

Hybrid dry cooler heat exchangers with one or more tube-fin heat exchange assemblies including at lease one such assembly wetted by water dropped on it with the first of such assembly stamped to provide arrays of slit/louver combinations breaking up water droplets and averting flight of droplets into a gas flowing between adjacent fins.

Description

FIELD AND BACKGROUND OF THE INVENTION[0001]The present invention relates to heat exchangers, often used for large air-conditioning and large refrigeration systems and more particularly to the finned tube heat exchangers used therein for the hybrid cooling of a liquid medium or for the liquefaction of refrigerants. Such types of apparatus have an air-side heat transfer surface wettable with water or other liquid and exposed to ambient air sucked in by at least one fan as coolant, for evaporation of water carried in the circulation system.[0002]Hybrid dry coolers are known (see e.g., European Patent EP 428 647 B1) in which the liquid medium of the primary cooling circuit flows through a finned heat exchanger and the heat to be dissipated via the cooling fins is emitted to the air stream partially as sensible and partially as latent heat.[0003]One or several fans suck the air stream through the heat exchanger and always run at the same rotating speed. The wetting water is pumped from a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F28D5/00
CPCF28C1/14F28F1/325F28D5/02F28C2001/145Y02B30/70
Inventor MULLER, WALTER
Owner JAEGGIGUNTNER SCHWEIZ
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