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2. a. A company is planning to install an air compressed system at its manufacturing plant. The compressed air is to be used to operate the instruments and portable tools and maintenance requirements. The compressed air requirements vary from 200 to 400 m/ hr with the pressure requirements vary from 4 to 8 bar i. Propose a feasible air compressed system for the company and explain the function of each component of the air compressed system, (6 marks] appropriate compressor for ii. Using the information in TABLE Q2, suggest the system. Justify an [4 marks] iii. Evaluate isothermal efficiency of the system if the actual measured input power is 30kw. [4marks] power is 30kw. [4marks] For most compressed air system, the utilization is intermittent. Due to this problem air receiver is normally included in the system installation. Explain the criteria in sizing the b. receiver. Determine the air receiver size for part (b) using the graph plot Figure Q2. [6 marks] TABLE Q2 Type of Compressor Capacity (m/h) Pressure (bar) From Te From To Roots blower compressor single stage 100 30000 0.1 Reciprocating Single / Two stage 100 12000 0.8 12 Multi stage 100 12000 12.0 700 Screw Single stage 100 2400 0.8 13 Two stage 100 2200 24 0.8 600 Centrifugal 00 0.1 450 40 35 30 25 20 15 10 2000 6000 C 4000 8000 10000 12000 14000 16000 18000 Air Rlow (m3/h) engineeringtoolbox.com FIGURE Q2

Answer 1

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