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It has recently been proposed that OTEC could be used to produce ammonia, a chemical currently manufactured from natural gas at a total energy consumption of about 2.5% of the U.S. natural gas consumption. Since the manufacture of ammonia could be accomplished anywhere, the plant could be located in a favorable location, for example, off the coast of Brazil, where the difference in temperature between the upper layer of the ocean and the layer at the 600 m depth is approximately 20 K. Using an OTEC power plant of 500 MWe capacity, estimate the number of tons of ammonia that could be produced per year. For a price of $165/ton of ammonia, estimate the time required to regain the capital investment in the OTEC production plant and compare your estimate with the claim that the capital could be repaid in 2.5 years.
what are the higher and the lower heating values of a fuel? how do they differ? how is the heating value of a fuel
Calculate the Grash of number, the Nusselt number, the convective heat transfer coefficient (h), and the total heat transfer (Q_dot) in ambient air at Tinf = 30C for the following conjurations:
A spring-loaded piston-cylinder device is initially filled with 0.13 lbm of an R-134a liquid-vapor mixture whose temperature is ?30°F and whose quality is 80 percent. The spring constant in the spring force relation F = kx is 37 lbf/in, and the pisto..
Major overhaul expenses of $5,000 each are anticipated for a large piece of earthmoving equipment. The expenses will occur at EOY four and will continue every three years thereafter up to and including year 13. The interest rate is 12% per year.
Four kg of water at 100°C fill a closed container having a volume of 1 m3. If the water at this state is a vapor, determine the pressure, in bar. If the water is a two-phase liquid-vapor mixture, determine the quality.
a boat of length 50m is designed to cruise at 30 mph and is to be tested in a tow tank with a model of length 0.5 m. if
Find the enthalpy of the steam discharged into the condenser and the thermal efficiency of the cycle.
Describe the properties of the Smith chart when used as admittance chart. In particular, discuss short and open circuit points, relation to the impedance chart, etc.
a tank has two rooms separated by a membrane. room a has 1kg of air and a volume of 0.5 m3 room b has 0.75 m3 of air
a model of an airplane is to be tested at 20degc in a wind tunnel. the model is built to 112th scale. in order to match
a 12-ft-long overhaning timber beam ac with an 8-ft span ab is to be designed to support the distributed and
an irreversible first-order reaction gave 95 conversion in a batch reactor in 20 min.a. what would be the conversion of
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