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1. A steady stream of R-410a at ambient temperature, 20?C, and 800 kPa enters a solar collector and exits at 80?C, 600 kPa. Calculate the change in exergy of the R-410a.
2. A heat pump has a COP of 2 using a power input of 3 kW. Its low temperature is T0 and its high temperature is 80?C, with an ambient at T0. Find the fluxes of exergy associated with the energy fluxes in and out.
A 1600 ft long sag verical curve (equal tangent) has a pvc at station 1200+00 and elevation o 1500 ft. the initial grade is -3.5% and the final grade is 6.5%. determine the elevation and stationing of the low point, pvi and pvt.
A first order reaction is employed in a destruction kind of a certain kind of microorganism. ozone is used as the disinfectant and the reaction is found to be dC/dt=-kC. where C is the concentration of microorganisms, microbes/ml.
Consider the condenser in Problem 7.48. Find the specific energy and exergy that are given out, assuming an ambient at 20?C. Also find the specific exergy destruction in the process.
There are three reactors degrading a chemical biologically, at three degradation rates; i.e., 0.2 d^-1, 0.4 d^-1, and 1.0 d^-1. The residence time of the chemical in these reactors are 10 d, 5 d, and 55 d, respectively.
The 20-lb cart B is supported on rollers of negligible size. If a 10-lb suitcase A is thrown horizontally on it at 10 ft/s, determine the length of time that A slides relative to B, and the final velocity of A and B. The coefficient of kinetic fri..
Determine the forces in members DC,CB and BA of the truss. State whether the members are in tension or compression. set P=7 kN. Determine the forces in members DE and EA of the truss.
A project for constructing a Facility just started. It involves the excavation of 40 to 60 feet deep and 60 feet wide trench to house double tunnels. A 24-inch outside diameter (22.5-inch inside diamater) water line is located in the path of the t..
If a new piece of equipment costs $40,000.00 to purchase and it has a benfit of $500 per day. How many days per year does the equipment need to be used in order to be worth purchasing (breaking even)
Determine the angle of friction - What are the principal stresses at failure and what is the inclination of the major pnncipal plane with the horizontal?
Consider a 1000-W iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-T6 (density = 2770 kg/m^3 and c(p)=875 J/kg C). The base plate has a surface area of 0.03 m^2.
If the tanker truck discharges into the top of the tank with no vapor control, the emission of gasoline vapors is estimated to be 2.75k*m^-3 of gas delivered to the tank.
Find the concrete cross-section and steel area required for a simply supported rectangular beam with a span of 20 ft that is to carry a computed dead load of 1.3 k/ft and a service live load of 2.25 k/ft.
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