Heat transfer from a fluid linear?

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SUMMARY

The discussion centers on the heat transfer of water through a heat exchanger, specifically comparing two scenarios: cooling water from 180 degrees to 160 degrees versus cooling water from 100 degrees to 80 degrees. Both scenarios exhibit a temperature change (Delta T) of 20 degrees. It is established that if the temperature change occurs at constant volume and the effect of temperature on heat capacity is negligible, the BTU output remains consistent across both scenarios. However, it is advised to verify the variation in heat capacity within the specific temperature range to ensure accuracy.

PREREQUISITES
  • Understanding of heat transfer principles
  • Knowledge of BTU (British Thermal Unit) calculations
  • Familiarity with heat exchangers and their operation
  • Basic concepts of heat capacity and its temperature dependence
NEXT STEPS
  • Research the specific heat capacity of water at varying temperatures
  • Explore the design and efficiency of heat exchangers
  • Learn about the implications of constant volume processes in thermodynamics
  • Investigate the relationship between mass flow rate and heat transfer efficiency
USEFUL FOR

Engineers, thermodynamics students, and professionals involved in HVAC systems or any applications requiring heat transfer analysis will benefit from this discussion.

triden
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If I had water at 180 degrees and dropped the temperature to 160 degrees over a heat exchanger, would I have the same BTU output as if I had water at 100 degrees and dropped the temp to 80 degrees? Delta T is 20 degrees for both situations.

I know if we were talking about Ke related to mass and velocity, and changed the velocity, energy would not trend in a linear fashion. Not sure about heat energy in water though.

Thanks
 
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If the temperature change is carried out at constant volume, neglecting the effect of temperature on heat capacity, the amount of heat would be the same. The heat capacity does vary a little with temperature, but typically not much. You need to check how much the heat capacity varies over the temperature range of interest.
 

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