Superheated steam at an average temperature 20°C is transported through a steel pipe ( k = 50 W/m .K, D 0 =8 .0 cm, D i =6 .0 cm, and L=20 .0 m) . The pipe is insulated with a 4-cm-thick layer of gypsum plaster (k = 0.5 WnrK). The insulated pipe is placed horizontally inside a warehouse where the average air temperature is 10°C. The steam and the air heat transfer coefficients are estimated to be 800 and 200 W/m 2 K, respectively. Calculate (a) the daily rate of heat transfer from the superheated steam, and (b) the teniperature on the outside surface of the gypsum plaster insulation.
Superheated steam at an average temperature 20°C is transported through a steel pipe ( k = 50 W/m .K, D 0 =8 .0 cm, D i =6 .0 cm, and L=20 .0 m) . The pipe is insulated with a 4-cm-thick layer of gypsum plaster (k = 0.5 WnrK). The insulated pipe is placed horizontally inside a warehouse where the average air temperature is 10°C. The steam and the air heat transfer coefficients are estimated to be 800 and 200 W/m 2 K, respectively. Calculate (a) the daily rate of heat transfer from the superheated steam, and (b) the teniperature on the outside surface of the gypsum plaster insulation.
Solution Summary: The author explains the rate of heat loss from the steam and the net heat transfer from it.
Superheated steam at an average temperature 20°C is transported through a steel pipe
(
k
=
50
W/m
.K, D
0
=8
.0 cm, D
i
=6
.0 cm, and L=20
.0 m)
. The pipe is insulated with a 4-cm-thick layer of gypsum plaster (k = 0.5 WnrK). The insulated pipe is placed horizontally inside a warehouse where the average air temperature is 10°C. The steam and the air heat transfer coefficients are estimated to be 800 and 200 W/m2 K, respectively. Calculate (a) the daily rate of heat transfer from the superheated steam, and (b) the teniperature on the outside surface of the gypsum plaster insulation.
/ Hot square plate (1 m ×1 m) is to be cooled by attaching aluminum circular pin fins (D=0.25 cm, L= 3 cm) distributed with distance 0.6 cm as illustrated in Figs.(1-a) & (1-b). If the fin base temperature is 100°C, cooling air temperature is 30°C and h= 35 W/m. °C. Determine the total rate of heat transfer from the finned plate and the effectiveness of the fins? Assume k= 237 W/m.°C and nr=tanh mL/ mL.
A cylindrical body having 10 cm diameter and lenth of 30 cm passes through a heat treatment furnace which is 6 m in length. The body must reach a temperature of 800°C before it comes out of the furnace. The furnace gas is at 1250°C and body initial temperature is 90°C. How much time it will take to attain the required temperature ? Take h = 100 W/m² °C. Take K(steel) = 40 W/m°C and a (thermal diffusivity of steel) = 1.16 x 10-5 m²/s.
There are 3 windows in a room with a width of 100 cm and a height of 150 cm.There is a single glass (k=0. 9 W/mK) of 5 mm thickness in the windows initially. Instead of these glasses to save heatYou are considering replacing it with double glazing consisting of 5 mm glass and 12 mm air (k=0.022 W/mK). Indoor and outdoor environmenttemperatures are 20 0C and -10 0C, respectively, and the heat transfer coefficients are 7 W/m2 K and 25 W/m2 K. The total heat loss in the room is 3.5 kW.when switching to double glazing;a) Find the decrease in heat transfer. b) Considering that the heat given by the heaters remains 3.5 kW, what would the room temperature be?
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