Refrigerant 134a flows in a 5-m long square duct that is located in a warehouse. One side of the square duct is 4 cm and surface temperature is -10 °C. Emissivity of the duct surface is 0.85. Air...



Refrigerant 134a flows in a 5-m long square duct that is located in a warehouse. One side of the square duct is 4 cm and surface temperature is -100C. Emissivity of the duct surface is 0.85. Air (ρ=1.2 kg/m3,cp
=1 kJ/kgK,k=0.03 W/mK,ν=2x10-5 m2/s,Pr=0.7) at 300C is blown over the duct. Temperature of the warehouse walls is 600C. What is the required air velocity to transfer 1 kW of heat to the duct?






a.

6 m/s






b.

4 m/s






c.

2 m/s






d.

5 m/s






e.

3 m/s







Refrigerant 134a flows in a 5-m long square duct that is located in a warehouse. One side of the square duct is 4 cm and surface temperature is -10<br>°C. Emissivity of the duct surface is 0.85. Air (p=1.2 kg/m³, c,=1 kJ/kgK, k=0.03 W/mK, v=2x10-5 m2/s, Pr=0.7) at 30 °C is blown over the duct. Temperature<br>of the warehouse walls is 60 °C. What is the required air velocity to transfer 1 kW of heat to the duct?<br>O a. 6 m/s<br>O b. 4 m/s<br>O c. 2 m/s<br>O d. 5 m/s<br>О е. 3 m/s<br>

Extracted text: Refrigerant 134a flows in a 5-m long square duct that is located in a warehouse. One side of the square duct is 4 cm and surface temperature is -10 °C. Emissivity of the duct surface is 0.85. Air (p=1.2 kg/m³, c,=1 kJ/kgK, k=0.03 W/mK, v=2x10-5 m2/s, Pr=0.7) at 30 °C is blown over the duct. Temperature of the warehouse walls is 60 °C. What is the required air velocity to transfer 1 kW of heat to the duct? O a. 6 m/s O b. 4 m/s O c. 2 m/s O d. 5 m/s О е. 3 m/s

Jun 11, 2022
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