A spherical container of inner radius of 0.44 m and outer radius of 0.6 m with a thermal conductivity 18 W/m·K holds radioactive waste that generates heat at 1 x 105 W/m3. The outer surface is exposed to a water flow with [infinity] 25°C and 750 W/m2·K. Find the heat transfer through the wall of container as well as the temperatures at the inside and outside surfaces of the container

Line joining liquid phase with liquid and solid phase mixture is known as: a) liquidus b) solidus c) tie line d) none of the mentioned

What precautions should you take to prevent injuries when dealing with heavy loads?

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?