A cylindrical storage tank for the collector in Problem 2 is located in the basement of the dwelling it serves. If the basement temperature is 16°C and the storage tank is 70°C, what is the heat-loss rate from the tank? The tank is a cylinder with diameter equal to its height; it is insulated with a 15-cm-thick fiberglass batt.
Problem 2
A packed bed storage system consists of a bed of crushed rock. The average diameter of the particles is 35 mm, and the sphericity was determined to be 0.75. Air is used as the heat-transfer fluid and flows through the system with a superficial bed velocity of 0.90 m/s. Calculate the pressure drop per unit length, assuming the air density is 1.15 kg/m3 and the air viscosity is 1.903 × 10-5 kg/m·s. How does this compare to the pressure drop when the particle diameter is 50 mm?