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COMPRESSORS UNIT 23 EXAM 1 QUESTIONS WITH COMPLETE SOLUTIONS

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COMPRESSORS UNIT 23 EXAM 1 QUESTIONS WITH COMPLETE SOLUTIONS Purpose of Economizer - Answer-Reduces flash gas by having a 2 stage pressure drop through float section Capacity control of centrifugal compressors - Answer-Speed control Butterfly damper Variable inlet vanes Compression factor...

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  • September 13, 2024
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  • 2024/2025
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  • Questions & answers
  • COMPRESSORS UNIT 23
  • COMPRESSORS UNIT 23
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COMPRESSORS UNIT 23 EXAM 1
QUESTIONS WITH COMPLETE
SOLUTIONS
Purpose of Economizer - Answer-Reduces flash gas by having a 2 stage pressure drop
through float section

Capacity control of centrifugal compressors - Answer-Speed control
Butterfly damper
Variable inlet vanes

Compression factors that affect efficiency - Answer-piston/compressor displacement
suction/discharge valves
number of cylinders
clearance pocket (size)

Speed
Suction/discharge pressures
Types of refrigerant used
capacity control method

Positive displacement compressors squeeze a contained gas. The method is to push
the ___ into spaces that become progressively _______. As the gas Molecules are
pushed in on themselves the gas pressure _____. - Answer-gas, smaller, rises

Types of positive displacement compressors are - Answer-Screw compressors
Reciprocating compressors
Scroll compressors
Rotary compressors

Dynamic compressor works to build up molecular velocities and converts this _____ to
static pressure. Most dynamic compressors use __________ impellers to add energy to
a gas. - Answer-energy, centrifugal

Speed

Hermatic compressors
Semi-hermatic compressors
open belt drives
open direct drive - Answer-Synchronous Actual

, 3600 rpm 3450 rpm
1800 rpm 1725 rpm
500 to 1500 rpm
1800-3600 rpm 1725-3450 rpm

Formula for calculating compressor speed - Answer-motor speed x motor pulley dia. /
compressor fly wheel dia.

Formula for calculating motor pulley dia. - Answer-compressor speed x compressor
flywheel dia. / motor speed

Compression ratio = - Answer-how hard the compressor works

refrigerant properties are different from refrigerant to refrigerant and will ______ the
operation of the compressor - Answer-impact

Compressor terminology

Saturated suction temp
saturated discharge temp
cubic feet per min
season energy efficiency rating
energy efficiency rating
co-efficient of performance
seasonal performance factor - Answer-SST
SDT
ft3/min
SEER
EER
COP
SPF

compressor specifications for max discharge temperature - Answer-225 to 275F, the
temperature oil starts to break down

compressor specifications for max suction temperature (high temp application) -
Answer-65 to 95F

compressor specifications for minimum suction superheat - Answer-20F, by the time it
gets to compressor inlet

compressor specifications for net positive oil pressure - Answer-30 to 40 psig (min. 10
psig)

Flooding - Answer-Liquid refrigerant returning to the compressor during the running
cycle

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