A heat exchanger is a device that allows energy to be transferred via heat transfer from a hot fluid to a cold fluid. Suppose a heat exchanger is designed such that a hot fluid passes over one side of...

A heat exchanger is a device that allows energy to be transferred via heat transfer from a hot fluid to a cold fluid. Suppose a heat exchanger is designed such that a hot fluid passes over one side of the flat plate whose surface area is 0.75 m², while the cold fluid passes over the other side. The fluid on the hot side of the flat plate maintains the surface temperature on the hot side at 100°C, while the cold fluid maintains the cold side of the plate at 30°C. The plate is made of a carbon steel (k
= 60 W/m
K). What is the thickness of the plate if the necessary conductive heat transfer rate across the plate is (a) 25 kW, (b) 100 kW, and (c) 300 kW?