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

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SUMMARY

This discussion focuses on calculating BTUs from temperature changes in a heat exchanger, specifically in a cooling application with a radiator and PWM fans. The user provided specific temperature readings: air entering the fans at 30.1°C, exiting at 59.2°C, input water temperature at 64.8°C, and output water temperature at 56.5°C. The radiator effectively removes 8.3°C from the water, leading to a need for conversion to BTU/hr for power calculations. The discussion emphasizes the importance of understanding the definition of BTU in this context.

PREREQUISITES
  • Understanding of heat exchanger principles
  • Knowledge of BTU and its definition
  • Familiarity with temperature conversion and flow rate calculations
  • Basic principles of thermodynamics
NEXT STEPS
  • Research how to calculate BTU/hr from temperature differences in heat exchangers
  • Learn about the specific heat capacity of water and its role in heat transfer
  • Explore the impact of flow rate on heat exchanger efficiency
  • Investigate the use of thermodynamic equations in HVAC applications
USEFUL FOR

Engineers, HVAC professionals, and anyone involved in thermal management or heat exchanger design will benefit from this discussion.

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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