. Customer Profiles
. Universities &
Increasing the efficiency of Condensing Coolers
A server-farm in Vienna needed an adiabatic cooling system supporting their existing cooling system which consisted of 105 table coolers of various configurations.
The new system should be able to guarantee at temperatures above +35° C (with an average humidity of 50% rH) a temperature drop of some 8 to 10 °C.
By means of a trial installation we could prove that our method was able not only to provide the desired temperature drop of some 10° C ( which was at first doubted by the technical management) but to reach a 12° C drop.
picture: one of eight shed-roofs with various table coolers
With the table coolers we could attain a maximal humidification of the feeder air up to 86% relative humidity.
The following diagram shows the temperature profile of our trial run on a hot summer day.
green ... inlet flow temperature
red ... return flow temperature
The diagram clearly shows the temperature increase during the day until noon; just before 13:00 hours air temperature in the vicinity of the table coolers reached some 43° C. At 13:00 hours we activated the fogging of the feeder air and could thereby lower both medium-temperatures by more than 12° C .
At 16:30 hours we closed the testrun with an immedeate and substantial increase of the medium-temperatures.
Layout of the fogging system:
The system was estimated for the maximal summer temperature of +35° C which is to be expected for Vienna. During recent years it happened every now and then that up to 3 consecutive days showed noon-temperatures up to +40° C. Moreover is Vienna situated at the rim of the Pannonic Plain which means that the range of air humidity can drop from the usual 45 - 50% rH to a below 30% rH. To manage also this peak loads efficiently we designed an automatic control system which works temperature-humidity-dependend and handles by modification of pump-parameters speed and nozzle pressure. By means of increasing the feeder pressure of the pumps from 55 bar to a maximum of 85 bar we can increase the nozzle-thruput by 50% to cover the needed water amounts.
above: three-fold table cooler with nozzle bars below
(20 nozzles A-250 @ 4,6 lit/hr with 55 bar).
Side-covers have been removed for photographing.
right: distributor station in the installation deck..
Each line leads to one of the eight shed-roofs where the table coolers are situated.
read more here ...
last modified MAR 2013
Copyright © 1990 - 2015 by Plantfog - Ing. Manfred Dolejsi - all rights reserved