Heat transfer with heat exchanger

[Jsanchez1029]

Hi,

I am attempting to cool transformer oil using a heat exchanger
it will be about 65 gallons of oil
this oil is absorbing 7200 watts of heat per hour which is about 24567 BTU's

The idea is to cool this oil by running it through a heat exchanger

http://carlsonhx.com/index.php?item=35C

the one on the above link specifically

the fluid cooling will be water
it is from a 7000 gallon open container sitting outside

January 55° / 39°
February 62° / 42°
March 68° / 45°
April 74° / 48°
May 82° / 54°
June 90° / 59°
July 95° / 63°
August 93° / 62°
September 89° / 58°
October 78° / 52°
November 65° / 43°
December 55° / 38°

above are the average temperatures in the area
this container would be covered to avoid direct sunlight


ideally, I want to keep the oil below 100 degrees

on a really hot day the temp will go up to 110 degrees

the idea is to use misters on the hot water going back into the pool to expel some heat
as well as the cool temperature during the night

can somebody suggest a formula/s or process to figure out if my system will work
I want to make sure I will not slowly be heating up the water and over a certain period of time not be able to cool the oil

I don't have any pumps yet, so I don't have a flow rate. I was thinking of using 1hp pumps so about 15 gpm. But I can always go higher or lower if needed

I appreciate any help or suggestions

Thanks,
Jose

 

[mk3223]

In the Carlson webpage on your link, you may input your process parameters in the "calculation" page to check your system for a proper sizing of the heat exchanger. The data you needed are the process temperatures of the oil and water, i.e. both in and out temperatures, instead the yearly ambient temperatures.

First, use the worst conditions to determine the heat exchanger size. And then, check the alternatives to see if it's suitable for your usage in terms of the space, cost and schedule, etc.

 

[georgeverghese]

The cooling water side of this HX may foul up, increasing pressure drop and reducing heat transfer. Good you've got a recirc pump in mind; an ambient finned oil cooler (cooling water not required) would be more reliable. BTW, your units for cooling duty are wrong; do you really mean kilojoules/hr and not watts/hr?

 

[IRstuff]

OP probably meant 7200 W, period, which results in 24567 BTU/hr

It looks doable, 7200 W for 24 hr = 622MJ 7000 gal provides 111 MJ/K, so maximum temperature rise in the water over 24 hr is only 5.6K

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

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