3.95 Copper tubing is joined to a solar collector plate of thickness t, and the working fluid maintains the tem- perature of the plate above the tubes at T There is a uniform net radiation heat flux q to the top surface of the plate, while the bottom surface is well insulated. The top surface is also exposed to a fluid at T that pro- vides for a uniform convection coefficient h. Air T h Absorber plate Working fluid Working fluid 21. (a) Derive the differential equation that governs the temperature distribution T(x) in the plate.. (b) Obtain a solution to the differential cquation for appropriate boundary conditions.