US Federal Building and Post Office Install ATCS
The General Services Administration (GSA) of Region 9 issued an invitation for proposals to replace an existing chiller with a higher efficiency 275 ton chiller at the United States Federal Building and Post Office in Los Angeles, California. One of the specifications included high performance at part load. A centrifugal chiller installation that featured an electronically controlled (inverter) variable speed drive was selected. The condenser tubes are internally ribbed for increased heat transfer efficiency. The condenser is equipped with an on-line brush automatic tube cleaning system to clean the inside surfaces of these tubes automatically according to a selected program (for example, three times per day). The building has 384,000 sq ft of usable floor space. In addition to the chiller discussed in this article, there are two other units. The 750 ton unit has not required cleaning since the on-line brush cleaning -system was installed.