please solve the question and write assumptions

please solve it correctly i need to get full mark

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8cm outer-diameter and 0.4m-long tubes inside which the refrigerant is evaporating at 220C. Air approaches the tube bank in the normal direction at 0C and 1atm with a mean velocity of 4 m/s. Following information is available for this tube bank: Longitudinal and transverse pitches are SL=ST=1.5cm There are 30 rows in the flow direction with 15 tubes in each row. Calculate the followings: (a) Refrigeration capacity of this system (b) Pressure drop across the tube bank Compare your results for in-line and staggered tube arrangement. Evaluate the air properties at an assumed mean temperature of 5C and 1atm. Is this a good assumption