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1. A commercial refrigerator keeps food fresh at -12 ºC. It is estimated that the refrigerator removes 3300 kJ/hr heat from the food, and rejects 4800 kJ/hr heat to the ambient, which is at 30 ºC. Determine the power input to the refrigerator in kW and the COP of the refrigerator.
2. An ice-making plant working on a Carnot cycle heat pump removes 3.5kW heat from the ice, which is maintained at 0 °C and rejects heat to the ambient, which is assumed to be at 25 °C. The work required by the heat pump is supplied entirely by a Carnot heat engine, which operates between a hot reservoir at 220 °C and a cold reservoir at the ambient temperature. Find (a) work output of the Carnot heat engine, (b) Heat absorbed by the Carnot heat engine from the hot reservoir, (c) Total heat rejected into the ambient.
The process and volume relation is given p=(8-4v)bar for a non flow process ,where V is in cubic meter.If 130kJ of work is supplied to the system,calculate the final pressure and volume of the system.Take the initial volume as 0.5 cubic meter.
a 200 mm diameter sight window on the wall of a furnace is losing heat at a rate of 1500 w. if the furnace is at 1200
Determine the heat transport rate of energy through an animal skull where average inside surface temperature is 95 degrees farinhiet and whose out outside surface temperature is 90 F. Assume the skull is a spherical shell 7.5 inches in outside dia..
consider an iron-carbon alloy that contains 0.2 wt c in which all the carbon atoms reside in tetrahedral interstitial
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