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A promising method of power generation involves collecting and storing solar energy in large artificial lakes a few meters deep, called solar ponds. Solar energy is absorbed by all parts of the pond, and the water temperature rises everywhere. The top part of the pond, however, loses to the atmosphere much of the heat it absorbs, and as a result, its temperature drops. This cool water serves as insulation for the bottom part of the pond and helps trap the energy there. Usually, salt is planted at the bottom of the pond to prevent the rise of this hot water to the top. A power plant that uses an organic fluid, such as alcohol, as the working fluid can be operated between the top and the bottom portions of the pond. If the water temperature is 35°C near the surface and 80°C near the bottom of the pond, determine the maximum thermal efficiency that this power plant can have. Is it realistic to use 35°C and 80°C for temperatures in the calculations? Explain
the roof of an industrial building is to be supported by wide-flange beams spaced 4ft on centers across a 20ft span.
a rigid well insulated container is outfitted with a moveable but frictionless partition that separates two sides but
A small ceramic crucible (mass of 0.26 kg) has just been washed and rinsed. Before it can be reused, it must be absolutely dry. To ensure that no residual water is present, the crucible is heated to 150 C from room temperature (23 ?C). How much heat ..
a helical compression spring is required to provide a minimum force of 80n at installation and have a working
energy addition in polytropic process in this case the initial air pressure is 750 psia and 750 f. the polytropic
a small model of a pump is tested in the laboratory and found to have a specific speed n equal to 1000 when operating
A centrifugal compressor has 23 radial vanes and an exit area equal to 0.12 m2, where the radial velocity is 27 m/s, and the tip speed of the impeller is 350 m/s. The total-to-total efficiency is 0.83.
calculate the escape speed from the earth for a 4800 kg spacecraft and determine the kinetic energy it must have at the
determine the minimum mass in kg of a 24 in long tension member that must support a load of 1000 lbs manufactured from
the uniform work platform which has a mass per unit length of 21 kgm is simply supported by cross rods a and b. the
A high-speed boat is powered by a water jet pump engine, similar to a jet engine on airplanes. The engine takes in water at the bow through a tube with diameter 1 ft, and the water is pumped out the stern of the boat through a 3-in diameter tube.
A submarine moves steadily through water at a depth of 350m and a speed of 5 m/s. a) find the static pressure p far away from the submarine at the 350m depth 2) find the pressure on the nose of the submarine.(kpa)
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