A composite wall consisting of two layers of different materials in perfect thermal contactseparates the hot and cold fluids in a flat plate heat exchanger. Layer 1 is in contact withthe hot fluid at a temperature of 250 ºC for which the convective heat transfer coefficient is30 W/m2 K; layer 2 is in contact with the cold fluid at a temperature of 50 ºC for which theconvective heat transfer coefficient is 25 W/m2 K. Layer 1 has a thickness of 2 cm and athermal conductivity of 160 W/m K and layer 2 is 0.5 cm thick and has a thermalconductivity of 55 W/m K.What are the main heat transfer modes involved in the system above andwhere do they occur?Determine the overall heat transfer coefficient U.Calculate the heat flux q between the two fluids.Find the temperature at the interface between the two layers.
A composite wall consisting of two layers of different materials in perfect thermal contact
separates the hot and cold fluids in a flat plate heat exchanger. Layer 1 is in contact with
the hot fluid at a temperature of 250 ºC for which the convective heat transfer coefficient is
30 W/m2 K; layer 2 is in contact with the cold fluid at a temperature of 50 ºC for which the
convective heat transfer coefficient is 25 W/m2 K. Layer 1 has a thickness of 2 cm and a
thermal conductivity of 160 W/m K and layer 2 is 0.5 cm thick and has a thermal
conductivity of 55 W/m K.
What are the main heat transfer modes involved in the system above and
where do they occur?
Determine the overall heat transfer coefficient U.
Calculate the heat flux q between the two fluids.
Find the temperature at the interface between the two layers.
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