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Heat Transfer - Fluids/ Thermo Equation

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I have an equation derived for a simple crossflow heat exchanger
the final equation is listed on the attachment its very simple
there are 2 variables in the equation that I do not know what they are
a C and a roe??
Simply tell me what c and roe are its a specific heat and a density I belive ???

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Yes. C = Specific heat of the material (Here, copper) at constant volume and

Rho = Mass density of the material (Here, copper)

Here is how the derivation goes, starting from equation (4.4):

m C (dT/dt) + h A t = h A ...

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