How Do You Calculate BTUs from Temperature Change in a Heat Exchanger?

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To calculate BTUs dissipated by the radiator, the temperature change of the water and the flow rate must be considered. With a water flow of 1.7 gallons per minute and a temperature drop of 8.3°C, the conversion to BTUs can be done using the formula: BTU/hr = flow rate (GPM) x temperature change (°F) x 500. The temperature change in Fahrenheit is approximately 14.94°F, leading to a calculation of about 12,000 BTU/hr. Understanding the definition of BTU as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit is essential for accurate calculations.
drkidd22
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Hello,
I'm working with a heat exchanger I'm trying to integrate into a cooling application. I've done some tests but want to have some clear understating of how the calculations are done or if I have missed something. Below is what I have so far.
So it's a radiation with 2 pwm fans, they push air through the radiator. It has a 1.7gpm water flow through the loop.

Air temp into fans: 30.1C
Air temp out fans (rear radiator): 59.2C
Input water temp to radiator: 64.8C
Output water temp from radiator:56.5C

So what I get from this is that the radiator is removing 8.3C from the water temp. How would this translate to actual power or BTUs dissipated by the radiator?
 
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drkidd22 said:
1.7gpm water flow
drkidd22 said:
8.3C from the water temp
drkidd22 said:
actual power or BTUs
Power? You want BTU/hr if you're interested in English units. What's the definition of BTU?
 

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