Heat transfer from a fluid linear?

In summary, the conversation discusses the relationship between temperature change and heat output in water. It is mentioned that in a heat exchanger, if the temperature is decreased from 180 degrees to 160 degrees, the same amount of heat would be produced as if the temperature was decreased from 100 degrees to 80 degrees with a delta T of 20 degrees. However, it is noted that heat capacity may vary slightly with temperature and should be checked.
  • #1
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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  • #2
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.
 

1. What is fluid linear heat transfer?

Fluid linear heat transfer is the process of heat transfer between a fluid (such as air or water) and a solid surface that is in motion relative to the fluid. This can occur through convection or forced convection, where the fluid is actively circulated, or through natural convection, where the flow is driven by density differences.

2. How does fluid linear heat transfer differ from other forms of heat transfer?

Fluid linear heat transfer differs from other forms of heat transfer, such as conduction and radiation, in that it involves the movement of a fluid. This movement can significantly affect the rate of heat transfer, as well as the direction of heat flow.

3. What factors affect fluid linear heat transfer?

The rate of fluid linear heat transfer is influenced by several factors, including the velocity of the fluid, the temperature difference between the fluid and the solid surface, the properties of the fluid (such as viscosity and density), and the geometry of the solid surface.

4. How is fluid linear heat transfer calculated?

The rate of fluid linear heat transfer can be calculated using the convective heat transfer coefficient, which takes into account the properties of the fluid, the geometry of the solid surface, and the temperature difference between the two. This coefficient can be determined experimentally or through theoretical calculations.

5. How is fluid linear heat transfer used in practical applications?

Fluid linear heat transfer is used in a wide range of practical applications, including heating and cooling systems, heat exchangers, and thermal management in industries such as aerospace and automotive. It is also a crucial factor in weather patterns and climate science, as it plays a significant role in the transfer of heat throughout the Earth's atmosphere and oceans.

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