19H - ALTERNATIVE ENERGY STUDY - Laserfiche WebLink

Home Browse Search

14 Job No. 2669.01 Water Systems Alternative Energy Feasibility Study for the project. This would mean that perhaps the intermediate pressure meter was not reading accurately. The original design submittal for the turbine showed a selection point at 8.0 CFS and 200 feet. Note, there are two stages of the turbine in series, so the pressure -drop for each stage (100 feet) is added together to get the total pressure drop of 200 feet. Historical logs available for 2006 and earlier indicate the following typical operation points: • MWD pressure at 165 to 190 psig. (average 177 psig) • Mid pressure at 68 to 75 psig. (average 71 psig) • System pressure at 60 to 69 psig. (average 64 psig) • This corresponds to the generator putting out 130 to 165 kW of power output. (average 147 kW) The pressure -drop in previous years averaged 106 psi through the turbine, or 244 feet of water, closer to its design drop of 200 feet. This leads us to the conclusion that the head recovery system is not currently working properly, as less head is dropped through the turbine than shown in the design or shown in historical operation records. It is assumed for this report that the observed operations represent the actual baseline operations for this unit. The unit is about 32 years old and was rebuilt about 14 years ago. It is assumed that the inefficiencies in the current operations represent the typical operating conditions due to the condition of the turbine, or its controls, or the PRV's controls, and that this can be considered the baseline operation of the system. If the Agency has a quick -fix and can lower the discharge pressure of the turbine back to about 71 psig, that can then be treated as the baseline of operations for this project. 6.3 POTENTIAL PROJECT AT SA -1 The proposed project for SA -1 is to replace the hydro -generator with a new unit, as illustrated in Figure 2. The new unit would be designed around the parameters the original unit was built for. The original operation was called out for a flowrate of 8 CFS. This is the flowrate that the unit is typically controlled to. CITY OF SANTA ANA 19H-22 Newcomb I Anderson I McCormick