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An overhead 25-m-long, uninsulated industrial steam pipe of 100-mm diameter is routed through a building whose walls and air are at 25°C. Pressurized steam maintains a pipe surface temperature of 150 C, and the coefficient associated with natural convection is h 10 W/m2 · K. The surface emissivity is ε = 0.8.
(a) What is the rate of heat loss from the steam line?
(b) If the steam is generated in a gas-fired boiler operating at an efficiency of ηf = 0.90 and natural gas is priced at Cg = $0.02 per MJ, what is the annual cost of heat loss from the line?
if the 1500-lb boom ab the 200-lb cage bcd and the 175-lb man have centers of gravity located at points g1 g2 and g3
Draw the load and the bending moment diagrams that correspond to the given shear force diagram. Assume that no couples are applied to the beam.
the boats position during the interval of time from t 2s tp t 10s is given by s 4t1.6t2-0.08t3 ma detremine the boats
In the sketch of a standard gear shown in Fig. 4.27, the teeth are 20° full depth if the pitch diameter is 120 mm and the module is 5, calculate the radius of the pin which contacts the profile at the pitch point. Compute the diameter DM measured ..
A Parshall flume is placed in a small stream to measure the discharge.
Calculate the allowable load P using a factor of safety n = 2.4, taking into account the possibility of Euler buckling about either principal centroidal axis (i.e., axis 1-1 or axis 2-2).
the net potential energy between two adjacent ions en may be represented by sum of -ar brn. calculate the bonding
Most spreadsheets have financial functions built in. Use these to answer the following question: If you now started saving $200 per month until you were 65, how much money would you have saved?
A rigid tank contains 10 lbm of air at 30 psia and 65°F. The air is now heated until its pressure doubles. Determine (a) the volume of the tank and (b) the amount of heat transfer.
Assuming that collapse occurs by Euler buckling of the strut, determine the angle θ for minimum weight of the strut.
The data obtained in a two-plane balancing procedure are given in the table below. Determine the magnitude and angular position of the balancing weights, assuming that all angles are measured from an arbitrary phase mark and all weights are added ..
steam enters an adiabatic turbine steadily at 7 mpa 500 degrees c and leaves at 100 kpa. if the mass flow rate is 6.2
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