COOLING TOWER PERFORMANCE @LOWER WET BULB TEMPERATURES

PERIODICAL THERE ARE USERS WHO WANT TO SEE SAME APPROACH @ VERY LOW WET BULB TEMPERATURES.

THEIR WISH IS MORE DUE TO A CONSUMER MIND SET WHICH IS TUNED TO PRESENT NOTION RATHER THAN ACTUAL PLANT OR PROCESS REQUIREMENT.

ON THE CONTRARY MANY TIMES PLANT OR PROCESS DOES NOT REQUIRE”TOO” COLD WATER TEMPERATING.

ONE CLASSIC CASE STUDY OF A RECENT REPLACEMENT CASE WHICH HAS FOLLOWING SPECIFICATIONS,

WATER FLOW = 500 M3/hr

HOT WATER = 38ºC

COLD WATER = 32ºC

WET BULB TEMPERATURE = 28ºC

DURING WINTER MONTHS ON DEC & JAN THE COLD WATER OBSERVED ARE IN THE RANGE OF 21ºC to 25ºC.

THE END USER WAS GIVEN PSYCHROMETRIC CURVES (WITH EXPONENTIAL CURVES) TO UNDERSTAND  EFFECT OF LOWER WET BULB VIS-A-VIS WITH INCREASE APPROACH .

THE SUBJECT OBVIOUSLY BECAME TOO TECHNICAL FOR UTILITY IN-CHARGE TO COMPREHEND.

IN THE END HE RELUCTANTLY AGREED TO REMAIN HAPPY WITH 21ºC to 25ºC. TEMPERATURES AS WAS STILL WISHING 20ºC to 22ºC. COLD WATER TEMPERATURES.

INTERESTINGLY IRONY IS THE TEMPERATURE OF 21ºC to 25ºC. ARE “TOO MUCH” FOR PROCESS PARAMETERS. ONE OF THE USE OF COLD WATER IS TO MAINTAIN OIL TEMPERATURE (SO AS TO MAINTAIN VISCOSITY)

WHEN TOO LOWER TEMPERATURES ARE BEING SUPPLIED BY COOLING TOWER THE PLANT PEOPLE ARE  REDUCING THE FLOW PASSING THROUGH HEAT EXCHANGER TO MAINTAIN DESIRED & PARAMETERS.

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