Question 4 a) Air is compressed in a compressor from a pressure of 100kPa and a temperature of 17C to a pressure of 1000kPa. Heat is removed from the compressor at a rate of 70kW by circulating water through the compressor casing. The volumetric flow rate of the air at the inlet conditions is 150m3/min, and the power input to the compressor is 550kW. i. Determine the mass flow rate of air. ii. Calculate the temperature at the compressor exit. (3 marks) (7 marks) A heat engine with a thermal efficiency of 45% produces 880kJ of work. Heat transfer to the engine is from a reservoir at a temperature of 550K, and the heat transfer from the engine to the surrounding air is at 300K. i. Sketch a schematic diagram to represent the heat engine system. (2 marks) ii. Determine the heat transfer to and from the heat engine. (4 marks) iii. If the heat engine is replaced by a Carnot heat engine producing the same work output, determine the heat transfer to and from the Carnot heat engine