A transmission case measures W = 0.30 m on a sideand receives a power input of P i = 150 hp from theengine. If the transmission efficiency is η = 0.93 and airflowover the case corresponds to T ∞ = 30 ° C and h = 200 W/m 2 ⋅ K , what is the surface temperature of thetransmission?
A transmission case measures
W
=
0.30
m
on a sideand receives a power input of
P
i
=
150
hp
from theengine.
If the transmission efficiency is
η
=
0.93
and airflowover the case corresponds to
T
∞
=
30
°
C
and
h
=
200
W/m
2
⋅
K
, what is the surface temperature of thetransmission?
Water at 20°C is pumped at a constant rate of 9 m3/h from a large reservoir resting on the floor to the open top of an experimental absorption tower. The point of discharge is 5 m above the floor, and friction losses in the 50-mm pipe from the reservoir to the tower amount to 2.5 J/kg. At what height in the reservoir must the water level be kept if the pump can deliver only 0.1 kW?In this problem, we can assume that the surface of the large reservoir and the absorption tower is at atmospheric pressure, show the complete mechanical energy balance describing the flow system? Take the floor to be at 0 height.
Two half-cylindrical materials with a length of L =1 m, which are of two different materials (A and B) given in the figure below, were covered with a cylindrical material with a length of L=1 m and a radius of r1 = 50 mm. The outer diameter of the half cylinders is r2= 100 mm. The transmission coefficients of each of the semi-cylindrical materials are respectively kA= 2W/mK kB= 0.25W/mK. The fluid with a temperature of h=25W/M2K and T_∞=300K passes over this cylinder. Accordingly (VARIABLES: r1 = 20-50 mm- r2= 70-100 mm)a)Find the conduction and convection resistances by drawing the resistor diagram.b)Find the total amount of heat transfer in the radial direction.c)Find the T2A and T2B temperatures for each of the materials A and B.
r1=10
T1=81
r11=22
r12=78
d3=2
Calculate the resistive force acting on the disk, with the error level not less than h^4, according to the pressure distribution on a circular disk of 0.5 m diameter held against the air flow, given in the table below.
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