3.) An ammonia compressor operates at evaporator pressure of 316.02 kPa and a condenserpressure of 1557 kPa. A twin-cylinder compressor with bore to stroke ratio of 0.85 is toused at 1200 rpm. The actual volumetric efficiency is 92% and compression and mechanicalefficiency is 78% and 80% respectively. For a cooling capacity of 25 TR, (a) the sketch thep-h diagram labeling the evaporating and condensing temperature and pressures (b) definethe all properties of ammonia taken from saturation table. Determine (c) the quantity ofcooling water in the condenser in kg/min if the increase in temperature is 8°C, (d) the boreand stroke expressed in cm and (e) the size of the driving motor in hp.Given: h2 = h at 1557 kPa and s2 = s11695 kJ/kg

Answered: 3.) An ammonia compressor operates at…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A single acting, twin cylinder, Ammonia compressor with bore equal to stroke is driven by an engine at 250 rpm. The machine is installed in a chilling plant to produce 700 kW of refrigeration at -18°C evaporating temperature. At this temperature the cooling effect per kg mass is 1160 kJ. The specific volume of vapor entering the compressor is 0.592 m³ per kilogram. Assume 85% volumetric efficiency, determine the bore in mm.
Q.1. A refrigeration process with interstage cooling uses refrigerant HFC-134a, and the outlet of the condenser is to be saturated liquid at 40°C. Refer to the following figure for stream numbers in your solution. The pressure of the flash chamber and the intermediate pressure between compressors is to be 290 kPa. The evaporator is to operate at -20°C and the outlet is to be saturated vapor. The flowrate of stream 1 is 23 kg/h. The flash chamber may be considered adiabatic. The compressors may be considered to be 80% efficient. a) What is the power input required to the first compressor? b) What are the flowrates of streams 6 and 7? What is the enthalpy of stream 4? Hot Side 6 5 Condenser 2nd Stage Compressor Throttle Valve 7 Flash Chamber Vapor Phase Only 1st Stage Compressor 8 Throttle Valve Evaporator 1 2 Cold Side

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