Engineering, 12.09.2019 04:30 shadowblade8203
Arefrigeration plant operates in pretoria on refrigerant r134a at an evaporator pressure of 105kpa (gauge) and a condensing pressure of 920 kpa (gauge). there is a sub-cooling of 3k with a superheat of the gas entering the compressor of 8k. the compressor is a four-cylinder reciprocating compressor with a bore of 67mm and a stroke of 57mm with an estimated capacity of 35kw. the compressor is directly coupled to an electric motor running at 1470rev/min and a power consumption of 19,5 kw. calculate: 1. the clearance volume efficiency if the compressor clearance is 3,6% 2. the actual volumetric efficiency 3. the compression efficiency when the mechanical efficiency is 85% and the motor efficiency 90%.
Answers: 1
Engineering, 03.07.2019 15:10
Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.
Answers: 1
Engineering, 04.07.2019 08:10
Which of the following is an easy way to remember the modified “x” tire rotation? a. nondrive wheels straight, cross the drive wheels b. drive wheels straight, cross the nondrive wheels c. drive wheels crossed, nondrive wheels straight d. drive wheels crossed, nondrive wheels crossed
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Engineering, 04.07.2019 18:10
Which one from below is not one of the reasons of planning failures? (clo3) a)-planner is careless. b-planner spend less time in the field but more time on the desk c)-planner is not qualified d)-planner does not have sufficient time to properly plan
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Engineering, 04.07.2019 19:10
What is the major difference between thermoplastics and thermosetting plastics from the polymerization structure point of view?
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Arefrigeration plant operates in pretoria on refrigerant r134a at an evaporator pressure of 105kpa (...
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