What is the mass of flow? Air is to be cooled in the evaporator section of a

 

What is the mass of flow?

Transcribed Image Text:

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 0.40 m-long tubes inside which the refrigerant is evaporating at T = - 20 °C. Air approaches the tube bank in the normal direction at 0°C and 1 atm with a mean velocity of 5.6 m/s. The tubes are arranged in-line with longitudinal and transverse pitches of S, = ST = 1.2 cm. There are 30 rows %3D in the flow direction with 15 tubes in each row. (N,=30, N,= 15). (Air properties: k = 0.02326W/m.°Ç , Pr = 0.7375,5 p =1.316 kg/m, u = 1.705×10 kg/m-s, C, =1.006 kJ/kg-K, Pr, T %3D d. = Pr@ T= 0.7408) 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 0.40 m-long tubes inside which the refrigerant is evaporating at T = - 20 °C. Air approaches the tube bank in the normal direction at 0°C and 1 atm with a mean velocity of 5.6 m/s. The tubes are arranged in-line with longitudinal and transverse pitches of S, = ST = 1.2 cm. There are 30 rows %3D in the flow direction with 15 tubes in each row. (N,=30, N,= 15). (Air properties: k = 0.02326W/m.°Ç , Pr = 0.7375,5 p =1.316 kg/m, u = 1.705×10 kg/m-s, C, =1.006 kJ/kg-K, Pr, T %3D d. = Pr@ T= 0.7408)