The overall data structure is a master dictionary. this master dictionary has key ‘entity’ (string), and value as a list. this list contains tuples for each instance of this entity observed in the data file. for example, aol occurs 3 times in the breach data. csv csv file, so there are three tuples within the list for aol. these 3 tuples are color coded below.

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?