1. Foothill College & Space Science Center Bill Kelly Viron Energy Services (510) 538-4416 ext 13, bkelly@viron.com

2. Foothill College & Space Science Center Foothill Campus: –484,000 square feet Space Science Center –Built in 1965 –Circular brick building –12,600 square feet on 2 floors –Community college classes & astronomical observatory –6 day a week operation, including night classes and evening observations Space Science Center/ Foothill Observatory

3. Foothill College & Space Science Center Project Scenario The original buildings were designed for heating and ventilation only When cooling was added, a separate systems for cooling in each building was installed –DX coils cut into H&V fan coil units with remote air cooled condensers –1.1 to 1.3 kW/ton Space Science Center included heating only –No roof insulation –Older lighting system –Constant air volume, no energy management system –Uncomfortable building

4. Foothill College & Space Science Center Baseline Electrical Energy Use Entire campus energy use –7 million kWh –14.5 kWh per square foot per year –$515,000 per year –average of $0.073 per kWh High energy use and cost –For a campus where the majority of rooms are not air conditioned

5. Foothill College & Space Science Center Project Challenges Balancing energy cost savings with needed campus improvements (i.e. adding air conditioning) Coordinating central plant and chilled water loop design with campus long term Master Plan Keeping classrooms operational Staging extensive construction on a busy campus

6. Foothill College & Space Science Center System Solutions Two phase project –New chilled water loop to serve the entire campus –Upgrade HVAC & lighting systems in each building

7. Foothill College & Space Science Center New Chilled Water Loop Central Plant is designed to serve 484,000 square feet & 57 buildings The Central Plant will include: –R-22 rotary screw chiller, 0.65 kW/ton, 170 tons –R-123 variable speed centrifugal chiller, 0.55kW/ton, 350 tons –Variable speed secondary chilled water pumping Chilled water loop piping –PVC, Direct Buried and in Tunnels

8. Foothill College & Space Science Center HVAC System Improvements Space Science Center –Variable air volume system, including new built-up air handling system and air distribution system –Energy management system tie-ed into new campus-wide Novar system –Operates based on temperature settings, outdoor temperature, operating schedule –Other HVAC improvements –100% outside air economizer system –New Boiler and hot water pump

9. Foothill College & Space Science Center Cooling Load Reductions Replaced existing lighting –New indirect T-8 fluorescent fixtures, electronic ballasts –New LED exit signs –Occupancy sensors for classrooms Added roof insulation –R-19 added to roof

10. Foothill College & Space Science Center Integrated Economics Long payback periods since most of the campus was not air conditioned and all improvements including major capital improvements.

11. Foothill College & Space Science Center Financing Structure Three primary funding sources –Municipal operating lease - 26% –Deferred maintenance bonds - 54% –Local bond - 20% Utility rebates –$16,000 from 1998 PG&E Retrofit Express –$150,000 from 1998 PG&E Standard Performance Contract

12. Foothill College & Space Science Center Project Timeline Oct 97Apr 98Oct 98Apr 99Oct 99

13. Foothill College & Space Science Center Project Results Reduced energy use by $0.27 per square foot Maintenance costs down $4,500 per year (mainly for lighting) New air conditioning, controls & lighting make building more comfortable and attractive Maintained original campus architecture while adding air conditioning