period five
Review
notes
Chilled-Water Systems
period five
Review
Figure 111
We will now review the main concepts that were covered in this clinic on chilled-water systems.
Review—Period One
▲Vapor-compression water chillers
◆Air-cooled versus water- cooled
▲Absorption water chillers
▲Equipment rating standards
▲ASHRAE/IESNA Standard 90.1-1999
Figure 112
In Period One, we learned about the different types of vapor-compression and absorption water chillers. Vapor-compression chillers are differentiated primarily by the type of compressor used and whether they use an air-cooled or water-cooled condenser. Absorption chillers are primarily differentiated by whether they are indirectly or directly fired.
We compared the use of air-cooled versus water-cooled chillers. Air-cooled- chiller advantages include lower maintenance costs, a prepackaged system for easier design and installation, and better low-ambient operation. Water-cooled- chiller advantages include greater energy efficiency (at least at design conditions) and longer equipment life.
