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Calculate the second-law efficiency of the coflowing heat exchanger in Problem 7.113 with an ambient at 17?C.
Problem 7.113
A coflowing (same direction) heat exchanger, shown in Fig. P7.113, has one line with 0.5 kg/s oxygen at 17?C, 200 kPa entering, and the other line has 0.6 kg/s nitrogen at 150 kPa, 500 K entering. The heat exchanger is very long, so the two flows exit at the same temperature. Use constant heat capacities and find the exit temperature and the total rate of entropy generation.
Soil falls from a conveyor belt into a cone shaped pile at a rate of 1000lb/min. The bulk density of the soil is 110lb/ft^3. The height of the pile is equal to the base diameter.
Find the equation that can be used to describe the perimeter of this cross section.
What soil conditions favor the use of belled caissons?
Determine the reactions on the beam. The support at B can beassumed to be a roller.
Using the central difference method and a time step of ?t = 0.02 seconds, find the displacement of the water tower at t = 0.02 and 0.04 seconds.
Determine the design load for strength and serviceability limit states (short-term and long term), for a steel beam in a residential building with the following data;
A classroom that normally contains 40 people is to be air conditioned with window air conditioning units of 5 kW cooling capacity. A person at rest may be assumed to dissipate heat at a rate of about 360kJ/h
Two carts with masses of 4.72 kg and 2.84 kg move toward each other on a frictionless track with speeds of 4.86 m/s and 3.97 m/s respectively. The carts stick together after colliding head-on. Find the final speed.
A child at a park finds a ball floating in a freshwater pond (temperature 30 degree C). The child swims to the ball and, with an incredible amount of dexterity, balances himself on the ball
What if unprotected steel joists are substituted for the wood joists? Or precast concrete plank ß oors with a 2-hour Þ re rating?
All drawings shall be composed on 18" X 24" Mylar/Vellum paper; each drawing shall be executed at the same scale, shall be selected on the basis of their prescriptive possibilities, shall be composed on a graphic design grid system
A heat pump that operates on the ideal vapor-compression cycle with refrigerant-134a is used to heat water from 15 to 45°C at a rate of 0.12 kg/s.
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