DieselShip's Online Content Library

Subscription based access to past question papers and solved answers

Sorted topic & Year / Month wise

Buy a Subscription Plan
Academics – Applied Heat : 2017/JUL/08
Question

Q8. A single acting, two stage reciprocating air compressors, takes in air at a pressure and temperature of 0.95 bar and 15℃ respectively and delivers it at 30 bars. The low-pressure cylinder has a bore of 300 mm and a stroke of 450 mm with a volumetric efficiency of 82 %.

The air enters the second stage at a pressure and temperature of 6 bar and 25℃ respectively.

The compressor speed is 200 rev/min.

The index of compression and expansion in both stages is 1.3.

(a) Sketch the process on a Pressure-Volume diagram. (2)

(b) Calculate EACH of the following:

(i) The compressor power; (4)

(ii) The heat removed in the inter-cooler; (4)

(iii) The heat removed by the cooling water in the low- and high-pressure cylinders. (6)

Note: for air R = 0.287 kJ⁄(kg k); Cp=1.005 kJ⁄(kg K.)

Asked in Year/Month/Ques No.
Hello Guest User,
Answers are available via our app only.
Please buy a membership plan and login via our app to view answers.

Download our App

This content is only available to members.