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Customer Stories

Long Beach City College

Long Beach City College hero.JPG


Planning for future expansion, the Long Beach City College  campuses were designed with open space for new building construction and additional cooling capacity in the central plant. With demand on the central plant increasing to meet the needs of the growing campuses, the college increased its focus on optimizing operations, increasing redundancy, and improving efficiency on both the LAC and PCC campuses.


Based on a long-standing relationship, LBCC discussed its needs with Trane. Using Trace™ 700 to model and calibrate operations, Trane performed an Investment Grade Audit and analyzed Energy Conservation Measures (ECMs) to determine potential savings and energy company incentives. Based on the analysis, funding was obtained through the Proposition 39 California Clean Energy jobs Act, a state program providing funding to local education agencies for improving energy efficiency and creating clean energy jobs.

Although the central plant was still relatively new, Trane proposed several ECMs to increase energy savings. The ECMs included the installation of a new high-efficiency Trane® CenTraVac™ chiller at the LAC campus, the optimization of the LAC and PCC central chiller plants, and other energy and operational savings measures.

Increasing capacity, improving efficiency
Operating at a maximum capacity of 1,500 tons, the central chiller plant at the LAC was designed to accommodate 2,400 tons of cooling, with space and piping connections in place for additional equipment. A Trane 900-ton ultra-high-efficiencyTrane CenTraVac centrifugal chiller was installed to increase capacity, along with an additional 1,200 tons of cooling tower capacity. Using a centrifugal compressor design, with  just one moving part, CenTraVac has achieved an industry design reliability rating of 99.7 percent. CenTraVac is capable of sustaining precise temperatures at tight tolerances that are key to occupant comfort, and provides average efficiency levels that are superior to other centrifugal chillers.

Reducing energy consumption
Tracer AdaptiView™ chiller controls on the new chiller help to enable optimum motor speed, quick change response, and water temperature stability. Existing chillers on the Long Beach City College campuses were also upgraded with Tracer Adaptiview control panels.  New chilled water and condenser water pumps with Trane TR200 Variable Frequency Drives (VFDs) were installed. The VFDs help the energy management system pinpoint the best setting for energy efficient cooling, ramping down the condenser water flow if needed and reducing motor speed.

Optimizing HVAC system
Teaming up with Enerliance, Trane installed a LOBOS Optimization System. The system interfaces with cooling, air handling and controls on both Long Beach City College campuses to increase efficiency and optimize operations.  Pumping, chilled water supply set points, and temperatures of condenser water and air supply are adjusted based on cooling load. The required cooling load is compared with the central plant equipment to select the most e cient chiller sequencing. The system predicts load requirements and ramps up the central plant at the optimum time, saving energy on cool mornings and nights. All of these functions are completed without sacrificing occupant comfort.


ECMs implemented at the Long Beach City College Liberal Arts and Pacific Coast Campuses include the installation of a Trane 900-ton, high-efficiency CenTraVac chiller with Tracer AdaptiView controls, a 1,200-ton cooling tower, new chilled and condenser water pumps with a variable frequency drive, and system optimization. The central plant upgrades have resulted in energy savings of more than $135,000 annually. In addition, Trane completed technical calculations, and coordinated the submission of paperwork to obtain energy efficiency rebates in excess of $270,000.

"Trane was excellent to work with, and we're happy with the results," said Tim Wootton, Long Beach City College, director, district facilities. "While this started as an energy management  project, we are also realizing the benefi ts of increased comfort for our students and staff ."