Alpha Geek
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Let the steam power plant in Problem 5.30 have a temperature of 700â—¦C in the boiler and 40â—¦C during the heat rejection in the condenser. Does that satisfy the inequality of Clausius? Repeat the question for the cycle operated in reverse as a refrigerator.
Problem 5.30
A temperature of about 0.01 K can be achieved by magnetic cooling. In this process a strong magnetic field is imposed on a paramagnetic salt, maintained at 1 K by transfer of energy to liquid helium boiling at low pressure. The salt is then thermally isolated from the helium, the magnetic field is removed, and the salt temperature drops. Assume that 1 mJ is removed at an average temperature of 0.1 K to the helium by a Carnot cycle heat pump. Find the work input to the heat pump and the COP with an ambient at 300 K.