Exposure to high concentrations of gaseous ammonia can cause lung damage. To prevent gaseous ammonia from leaking out, ammonia is transported in its liquid state page 232 through a pipe ( k = 25 W/m .K, D i =25 cm, D o =4 cm and L= 10 m) . and Since liquid ammonia has a normal boiling point of -33.3°C, the pipe needs to be properly insulated to prevent the surrounding heat from causing the ammonia to boil. The pipe is situated in a laboratory, where the average ambient air temperature is 20°C. The convection heat transfer coefficients of the liquid anunonia and the ambient air are 100 Wm2K and 20 Vin2K. respectively. Determine the insulation thickness for the pipe using a material with k = 0 .75W/m 2 .K, to keep the liquid ammonia flowing at an average temperature of -35°C, while maintaining the insulated pipe outer surface temperature at 10°C.
Exposure to high concentrations of gaseous ammonia can cause lung damage. To prevent gaseous ammonia from leaking out, ammonia is transported in its liquid state page 232 through a pipe ( k = 25 W/m .K, D i =25 cm, D o =4 cm and L= 10 m) . and Since liquid ammonia has a normal boiling point of -33.3°C, the pipe needs to be properly insulated to prevent the surrounding heat from causing the ammonia to boil. The pipe is situated in a laboratory, where the average ambient air temperature is 20°C. The convection heat transfer coefficients of the liquid anunonia and the ambient air are 100 Wm2K and 20 Vin2K. respectively. Determine the insulation thickness for the pipe using a material with k = 0 .75W/m 2 .K, to keep the liquid ammonia flowing at an average temperature of -35°C, while maintaining the insulated pipe outer surface temperature at 10°C.
Solution Summary: The author analyzes the thermal resistances of different layers by solving for the insulation thermal conductivity yields kins = 0.75 W/m-K.
Exposure to high concentrations of gaseous ammonia can cause lung damage. To prevent gaseous ammonia from leaking out, ammonia is transported in its liquid state page 232 through a pipe
(
k
=
25
W/m
.K,
D
i
=25 cm, D
o
=4 cm and L= 10 m)
.
and Since liquid ammonia has a normal boiling point of -33.3°C, the pipe needs to be properly insulated to prevent the surrounding heat from causing the ammonia to boil. The pipe is situated in a laboratory, where the average ambient air temperature is 20°C. The convection heat transfer coefficients of the liquid anunonia and the ambient air are 100 Wm2K and 20 Vin2K. respectively. Determine the insulation thickness for the pipe using a material with
k = 0
.75W/m
2
.K,
to keep the liquid ammonia flowing at an average temperature of -35°C, while maintaining the insulated pipe outer surface temperature at 10°C.
Determine the convection heat of a boiler if you are given the following data: Because boiling is taking place, use a value of 5,000 W/m2 * K as the convection heat transfer coefficient. T1 is the temperature of the boiler. water is 25°C and the T2 of steam is 110°C
Calculate delta S when 1 mole of supercooled water at –10oC and 100 kPa is converted into ice at -10oC and 100 kPa. The molar heat capacity at constant pressure (Cm,P) of ice is 37.7 J K-1 mol- 1, and that of supercooled water is 76.1 J K-1 mol-1. The enthalpy of freezing of water is -6004 J mol-1.
final answer: -20.54 J K-1
What are the Poisson equations? How would the respective equations look like at isothermal, iso-choric, isobaric conditions?
Chapter 3 Solutions
Heat and Mass Transfer: Fundamentals and Applications
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