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horrorfan [7]
3 years ago
14

A small distiller evaporates 10 L of water per half hour. Alloy tubing exposed to the air serves a condenser to recover steam. T

he outside surface of the tubing is at 99C. The ambient temperature is 20C. The inside diameter of the tube is 0.85 cm, and the outside diameter is 1.2 cm. The thermal conductivity of copper is 388W/m.K, latent heat of condensation (hfg) for saturated steam at 100C is 2257kJ/kg. In order to condense all the steam, the tube length in meters is most nearly. How long must the tube be to condense all of the steam?
a) 0.3 nm
b) .2 m
c) 2.4 m
d) 8.3 mm
e) 10.8 m
Engineering
1 answer:
xxTIMURxx [149]3 years ago
7 0

Answer:

c) 2.4m

Explanation:

1 liter of water evaporates in 30 minutes, Mass of water evaporation is :

1 / (30 * 60) = 5.55 * 10^{-4}

The diameter of the tube is 0.85 cm inside and 1.2 cm outside

L = 1253 / 518.434 = 2.416

The length of the copper tube must be 2.4 m long.

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Answer:

a) V_2 = 82.1 m/s

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Explanation:

from A-11 to A-13 we have the following data

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h_1 = 262.52 kJ/kg

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V_2 = 0.0313 m^3/kg

T_2 = 40°C = 313K

h_2 = 278.66 kJ/kg

Now, from the conversation of mass,

A_2*V_2/u_2 = A_1*V_1/u_1

V_2 = A_1/A_2*u_2/u_1*V_1

V_2 = A_1/1.8*A_1 * 0.0313 /0.033925*160

V_2 = 82.1 m/s

now from the energy balance equation

E_in = E_out

Q_in + m(h_1 + V_1^2/2) =  m(h_2 + V_2^2/2)

m = 0.298 Kg/s

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4 years ago
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The attachment below shows the calculations

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Which of the following statements about a metal wire in equilibrium are true? Select all that apply. The electric field inside t
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The interior of the metal wire is neutral

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Explanation:

When a metal wire is in equilibrium, the interior of the metal wire is always neural and there is no net flow of mobile electrons inside the wire. Additionally, there are no excess charges in the interior of the wire but there is likelihood of having excess charges on the surface of the wire. Finally, the net electric field everywhere inside the wire is zero

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