Trane TRG-TRC010-EN ReviewPeriod 3

TRG-TRC010-EN 49

period six

Review

notes

Period 2 described the refrigeration cycle of 2-stage centrifugal water chillers

with a pressure-enthalpy chart. The operation of the purge system for low-

pressure chillers was also presented.

Period 3 further explained the operation of the centrifugal compressor. It

described the use of impeller inlet vanes as one method for controlling

centrifugal compressor capacity. Surge, multistage compressors, and

adjustable-frequency drives were also discussed.

Review—Period 2

pressure

enthalpy

evaporator

condenser

2-stage

compressor

expansion

devices

devices8

economizer

Figure66

Review—Period 3

inlet vanes

impellers

Figure67

trgtrc010_book.book Page 49 Wednesday, September 1, 1999 10:42 AM

Contents

Main BUSINESS REPLY MAIL Page Page Preface A Trane Air Conditioning Clinic Contents Page Introduction Chilled Water System helical-rotary absorption centrifugal Introduction Centrifugal Water Chillers period one period one Centrifugal Water Chiller Compressor Compressor Impeller Centrifugal Compressor Energy Conversion Multistage Compressor notes Condenser Condenser Expansion Device Orifice Plates Economizer Economizer notes Evaporator Evaporator Motor Motor gear-drive direct-drive Hermetic Motor Cooling notes Controls and Starter Controls and Starter Starters unit-mounted remote-mounted p h period two p-h) Pressure-Enthalpy ( liquid vapor Chart Page Page Refrigerants Refrigerant Operating Pressures Page Multistage Compressor Impeller 24 refrigerant. Recall that kinetic energy is converted to static energy, or static pressure. Impeller Dynamics V rotational speed diameter V Compressor Unloading full load part load Surge Compressor Map notes Operating Point 2-Stage Compressor Adjustable-Frequency Drives period four period four Maintenance Considerations ASHRAE Guideline 3 Page Mechanical Components Heat Transfer Surfaces Fluid Analysis notes Oil Analysis period five period five Condensing Temperature Control Condensing Temperature Control Cooling Tower Bypass Constant or Variable Evaporator Water Flow Constant or Variable Flow Limitations Short Evaporator-Water Loops Short Evaporator-Water Loops Heat Recovery Heat Recovery Heat-Recovery Chiller Options Free Cooling Free Cooling Refrigerant Migration Equipment Certification Standards ARI Standard 550/590 ARI Standard 550/590 notes period six ReviewPeriod 1 period six ReviewPeriod 2 impellers inlet vanes ReviewPeriod 3 impellers ReviewPeriod 4 ReviewPeriod 5 Engineers Newsletter Engineered Systems Clinics Quiz Questions for Period 1 1) 2) 3) Quiz Questions for Period 4 Questions for Period 5 Answers Standard for Water Chilling Packages Using the Vapor-Compression Cycle, Page notes 85577_Cover.fm Page 2 Wednesday, September 1, 1999 10:08 AM