2) In an oil-gas turbine installation, air is taken at pressure of 1 bar and 27°C and compressed to a pressure of 4 bar. The oil with a calorific value of 42,000 kJ/kg is burnt in the combustion chamber to raise the temperature of air to 550°C. If the air flows at the rate of 1.2 kg/s; find the net power of the installation. Also find the air-fuel ratio. Take Cp =1.05 kJ/kg K. [Hint: Determine the mass of fuel burnt by dividing the heat supplied to air by the calorific value of fuel. Air-fuel ratio is the ratio of mass of air to the mass of fuel. Mass of fuel burnt per second = (Heat supplied to air/ Calorific value of fuel) Air-fuel ratio = (Mass of air/ Mass of fuel)]

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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.