APPLIED THERMODYNAMICS (SKMM 2423) TEST 2 (Sem 1 … · APPLIED THERMODYNAMICS (SKMM 2423) TEST 2...
Transcript of APPLIED THERMODYNAMICS (SKMM 2423) TEST 2 (Sem 1 … · APPLIED THERMODYNAMICS (SKMM 2423) TEST 2...
APPLIED THERMODYNAMICS (SKMM 2423)
TEST 2 (Sem 1 2016/2017)
06/11/2016
(9:00 am – 10:00 am)
ANSWER THE QUESTIONS
Question 1 (5 marks)
a) What is the function of air compressor?
b) List two types of positive displacement air compressor and describe three different comparisons
between them.
Question 2 (10 marks)
A single-stage, single-acting air compressor operates at 1000 rpm delivering air at 25 bar. Conditions at the
entrance and during induction are assumed the same at 1.013 bar and 15°C, and the free air delivery (FAD) is
0.25 m3/min. The clearance volume is equivalent to 3% of swept volume and the stroke/bore ratio is 1.2/1. Index
of compression and expansion is 1.3.
a) Sketch and label the pressure-volume (P-V) diagram.
b) Calculate the size of cylinder bore and stroke, [m].
c) Calculate the volumetric efficiency, [%].
d) Determine the indicated power, [kW].
e) Calculate the isothermal efficiency, [%].
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