School Calls for Chiller Upgrade

The children's center at Washington Elementary School in Sacramento, Calif., is open year-round, and with a number of classrooms lacking windows, there is a constant demand for cooling. High charges for peak usage, coupled with the inefficiency of old chillers, called for a chiller replacement.The school had been using a pair of air-cooled reciprocating compressor chillers that were 20 years old.

01/01/2001


The children's center at Washington Elementary School in Sacramento, Calif., is open year-round, and with a number of classrooms lacking windows, there is a constant demand for cooling. High charges for peak usage, coupled with the inefficiency of old chillers, called for a chiller replacement.

The school had been using a pair of air-cooled reciprocating compressor chillers that were 20 years old. The primary unit had a cooling capacity of 60 tons, while the secondary unit's capacity was 40 tons. The challenges were to provide efficient operation at varying loads, control the existing secondary chiller with automatic lead/lag operation and install a new, quiet primary chiller that fit on the existing concrete pad.

With design ambient conditions of 105°F dry bulb/71°F wet bulb, designers undertook a comparison of evaporative- and air-cooled chillers-based on the load profile and the unit delivering 45 tons-and determined that the evaporative-cooled chiller would deliver an operating savings of about 60 percent.

To learn more about ECDX-045 chillers from Dunham-Bush, circle 103 on the Reader Service Card.





No comments
Consulting-Specifying Engineer's Product of the Year (POY) contest is the premier award for new products in the HVAC, fire, electrical, and...
Consulting-Specifying Engineer magazine is dedicated to encouraging and recognizing the most talented young individuals...
The MEP Giants program lists the top mechanical, electrical, plumbing, and fire protection engineering firms in the United States.
Combined heat and power; Assessing replacement of electrical systems; Energy codes and lighting; Salary Survey; Fan efficiency
Commissioning lighting control systems; 2016 Commissioning Giants; Design high-efficiency hot water systems for hospitals; Evaluating condensation and condensate
Solving HVAC challenges; Thermal comfort criteria; Liquid-immersion cooling; Specifying VRF systems; 2016 Product of the Year winners
Driving motor efficiency; Preventing Arc Flash in mission critical facilities; Integrating alternative power and existing electrical systems
Putting COPS into context; Designing medium-voltage electrical systems; Planning and designing resilient, efficient data centers; The nine steps of designing generator fuel systems
Designing generator systems; Using online commissioning tools; Selective coordination best practices
As brand protection manager for Eaton’s Electrical Sector, Tom Grace oversees counterfeit awareness...
Amara Rozgus is chief editor and content manager of Consulting-Specifier Engineer magazine.
IEEE power industry experts bring their combined experience in the electrical power industry...
Michael Heinsdorf, P.E., LEED AP, CDT is an Engineering Specification Writer at ARCOM MasterSpec.
click me