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 0C. 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 30 0C is blown over the duct. Temperature of the warehouse walls is 60 0C. What is the required air velocity to transfer 1 kW of heat to the duct?a.6 m/sb.4 m/sc.2 m/sd.5 m/se.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°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. Temperatureof 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/sO b. 4 m/sO c. 2 m/sO d. 5 m/sО е. 3 m/s

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Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

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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 ⁰C. Emissivity of the duct surface is 0.85. Air (ρ=1.2 kg/m³, c_p=1 kJ/kgK, k=0.03 W/mK, ν=2x10^-5 m²/s, Pr=0.7) at 30 ⁰C is blown over the duct. Temperature of the warehouse walls is 60 ⁰C. What is the required air velocity to transfer 1 kW of heat to the duct?

6 m/s

4 m/s

2 m/s

5 m/s

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
°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

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