Question: (a) An air compressor is set to supply compressed air at 720 kPa (absolute pressure). The air compressor is installed outdoors. The average temperature

(a) An air compressor is set to supply compressed air at 720 kPa (absolute pressure). The air compressor is installed outdoors. The average temperature of the air intake is 30C when the air compressor is placed near a heat source. An EMO suggests that the air compressor should be relocated to a place under shading. The average temperature of air intake will be reduced to 10C. (i) Sketch the two air compression processes in the P-h diagram given in Figure 3.1. (5 marks) (ii) Determine the energy saving (%) of the above EMO. (10 marks) (b) Figure 3.2 shows the air compression cycles of a single-stage air compressor and a two-stage air compressor. Estimate the energy saving (%) of the two-stage air compressor. (10 marks) Pressure, P Volume, V Fig. 3.2. Air compression cycles of single-stage air compressor (solid lines) and two-stage air compressor (dashed lines)

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