From the plot in​ (a), does it appear as if a relationship exists between wear and​ load? A. When the load value​ increases, the wear value does not change. This does not show a certain relationship. B. When the load value​ increases, the wear value also increases. This does show a certain relationship. C. When the load value​ increases, the wear value does not consistently change in the same direction. This does not show a certain relationship. D. When the load value​ increases, the wear value decreases. This does show a certain relationship.

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?