Q1) Two parallel, long and insulated pipes are buried in the ground for a district heating and cooling system as shown in the figure below. One pipe carries cold water for cooling while the other pipe carries hot water for heating. The known information is given in the figure. What is the steady-state rate of heat transfer from the hot pipe to the cold pipe per unit length of pipe? Neglect the thermal resistances associated with convection and with conduction through the pipe. Assume that the pipes are buried sufficiently deep such that the effects of the ambient air on this problem are negligible. Ambient Air Ground (k = 0.5 W/m.K) Cold Water Temp. = 5 C 40. cm Pipe Outside Dia. = 20 cm -Insulation k= 0.05 W/m.K Thickness=5 cm Hot Water Temp. = 80 C