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The outside coils of a certain electric heat pump operate at 10 °C below the ambient temperature, and those on the inside operate at 10 °C above the ambient temperature. Otherwise, there are no losses at all. Suppose that the outside temperature is freezing and the indoor temperature is kept at 17 °C.
(a) How many joules of work are required for your heat pump to deposit one joule of heat energy inside?
(b) Now suppose that the combined power plant and transmission line efficiency is 30%. That is, of the energy of the original primary fuels, 30% reaches your heat pump as electrical energy. How many joules of energy in the primary fuels are required per joule of energy delivered to your house?
(c) Is it a more efficient use of primary fuels to run your electric heat pump or to burn the primary fuels in your space heater?
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Derive the Euler-Lagrange equation and natural and geometric boundary conditions of beam theory using the δ operator on the functional given in the text (Example 2.5).
Air enters a nozzle steadily at 50 psia, 140°F, and 150 ft/s and leaves at 14.7 psia and 900 ft/s. The heat loss from the nozzle is estimated to be 6.5 Btu/lbm of air flowing. The inlet area of the nozzle is 0.1 ft^2. Determine (a) The exit temperatu..
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A 6-lb collar can slide without friction on a vertical rod and is held so it just touches an undeformed spring.
In the roll-wrapping process, a resin pre-impregnated fiber cloth (Pre-Preg) is wrapped around a mandrel; tubes may be manufactured in a variety of woven patterns. Provide an explanation for why either a helical or a square weave might be selected..
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