Which option explains why wood was chosen in the following scenario? Angelo is building small sustainable homes in a remote area of Russia. He must use sustainable materials available in the area that will keep the residents warm and provide them with access to modern technology. Wood is resistant to corrosion and chemicals. Wood is malleable and ductile. Wood is age resistant and resilient. Wood is a good electrical and thermal insulator.

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?