Heat and Mass Transfer
The expression Q = ρ AT4 is called

Newton Reichmann equation
Joseph-Stefan equation
Stefan-Boltzmann equation
Fourier equation

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Heat and Mass Transfer
In counter flow heat exchangers

Both the fluids at inlet are in their hottest state
Both the fluids at exit are in their hottest state
Both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state
One fluid is in hottest state and other in coldest state at inlet

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