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Belton Wheel Date of submission: XX April 2013 Plagiarism Declaration: 1. I know that plagiarism is wrong. Plagiarism is to use another’s work and pretend that it is one’s own. 2. Each significant contribution to, and quotation in, this assignment from the work(s) of other people has been attributed, and has been cited and referenced. 3. This assignment is my own work. 4. I have not allowed, and will not allow anyone to copy my work with the intention of gassing it off as his or her own work.
Student No. Initials Surname Signature Date: 11 March 2013 Aim The aim of this practical is to examine aspects of a single-stage air compressor. Introduction and theory In this practical, we need 1 . To determine the instantaneous value of the (polytypic)coefficient of compression from the slop of the pressure/volume(P/v) diagram, near the start, in the middle and at the end of the compression. To determine the indicated work/cycle of the compressor from the P/v diagram. Where: Work/cycle=(m. E. P) x (piston-area) x stroke And m. E. P= mean effective pressure= average pressure(I. E stroke of the compressor) 3. To determine the volumetric efficiency of the compressor. A pressure transducer is used so that a potential drop will be created for a change in pressure. A similar process is used to capture the volume being compressed. These voltages are then captured by an oscilloscope with respect to time. Method
The values of several different readings are noted from the digital display on the control board. A graph of the voltages corresponding to the pressure is plotted against those corresponding to the volume. The plot obtained is of the same shape as that of a P-v Lollygag UT D ten axes are In unlit AT volts be applied. Data No of pistons 2 Bore Stroke piston area 2827. 433 Mrs. Reading Value Units 28 16. 1 P at DC 750 h 0. 018 Speed 1049 RPM coos ё Volts I Norte an appropriate scale Doctor must Amps 5 Torque 7. 2 keg at mm Pop Atm 0. 74905 m Hug