1. Prepared by Jim Baillon and Ken Cosgrove Report and Recommendations Cooling Towers- Condos

2. Selection of Cooling Tower Consultant Solicited proposals from three companies-Phoenix, El Paso and Mazatlan. IngeneriaTermicaAvanzada selected-reasons: qualifications, location and cost. Investigation started May 2009-report delivered August 2009

3. Findings The tubes and the sinks of the three cooling towers are in a very bad shape due to the high levels of scale and corrosion of the water in the external circuit. There hasn’t been water treatment to the system since more than six months ago There is a flow switch in each cooling tower primary circuit to prevent the indoor units from operating without water flow. However they are in bad conditions and probably out of service. Cooling towers #1 and #2 have two fans each, and cooling tower #3 has three fans. However there is only one fan operating for each cooling tower. The rest of them were uninstalled

4. Findings-Photos-Controls

5. Findings-Photos-Tube Scale

6. Consultant Recommendations Due to visible damage on the tubes of the external circuit, it is highly recommended to replace the Cooling Towers Establish chemical treatment program of water-for biological and corrosion control-Legionellapneumophila Establish maintenance program Establish blow down capability to control scale and corrosion Install Variable Frequency Drives (VFD’s) for the internal circuit pumps to improve efficiency of the system and reduce operating costs when it operates at partial load situations below 80%.

7. Consultant Recommendations Install 2-way shut-off valves at each WSHP unit in the condominiums to improve the efficiency of the systems Install flow balancing valves (circuit-setters) at each WSHP unit to balance the correct amount of water flowing to each circuit and avoid that they may be overfed or underfed. This action will improve the system efficiency The existing flow switches should be replaced immediately since there is no evidence they are operating properly. This may result in serious damages to the WSHP units in case of a failure in the internal circuit pumps.

8. Committee Recommendation Complete Phase 1 –energy efficient motors and controls-cost $24,500 Install shut-off valves and flow balancing valves in each condo during first qtr 2010 –cost $310/WSHP Perform chemical treatment, cleaning,and installation of water conditioner during first qtr 2010.Cost-$20,000. Contract for installation of new tower 1 in 4 th qtr 2011- $85,000 Contract for installation of tower 2 in 2012-$105,000 Contract for installation of tower 3 in 2013-$90,000 Per tower-10 weeks to mfg and ship and 6 weeks to install