. Dry air at 25 °C and 1 bar are to be liquefied. The air is isothermally compressed to 180 bar. Assume 75% air of the total air compressed is passed through the expander. The temperature of the air entering the expander is – 70 °C while the temperature of the air leaving the expander is – 140 °C. The make-up air is supplied at 30 °C and 1 bar. Find the yield of liquid air in lb per lb of air compressed and the temperature of the air before throttling.

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Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.