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Power Derate Control The PureCycle power system is designed for operating ambient temperature between -20oF and 122oF (-28oC and 50oC). Output power may decrease with electronic control system (ECS) enclosure internal temperatures over 113oF (45oC). This output power reduction is expected to correspond with an ambient temperature exceeding 104oF (40oC) but may vary based on site conditions including, but not limited to, cooling water inlet temperature, solar loading and orientation, wind conditions and elevation. Resource Liquid Composition Resource liquid quality is highly site specific and is the customer’s responsibility to determine suitability for this application. Typically, water consultants are hired to assist in the proper selection of materials. Pratt & Whitney Power Systems offers alternate heat-exchanger materials for use with various contaminants. Particulates in the resource water must also be carefully examined to determine the potential for fouling the heat exchangers and reducing performance and life. Applications with high particulate levels may be viable if the proper chemical treatments and cleaning processes are used. The evaporator is designed to be easily inspected and cleaned in the field. In all cases, it is the responsibility of the customer to develop cleaning processes to maintain maximum performance and evaporator life. At a minimum, annual inspection of the heat exchanger tubes is recommended. Heat-Exchanger Pressure Drop Tube-side pressure drop across the evaporator and condenser will vary depending on the flow for the proposed application. Evaporator Typical pressure drops for the evaporator are shown in Figure 10. For the evaporator, the minimum design flow is 180 gpm (11.4 l/s), and the maximum design flow is 1100 gpm (69.4 l/s). Generally, lower resource temperatures will require greater resource flows. The two lines shown represent the expected power plant pressure drop range through several flow ranges. At the site level, pressure drop through the site piping and balance of plant should be managed to minimize the flow variation and reduce the pressure drop required for the controlling band. 30 25 20 15 10 5 0 100 200 Pea Evaporator Pressure Drop vs. Resource Flow Rate Consult PWPS for Applications in this Range Controlling Ba nd o w r Control Valve ~ 60% Open Pl P n tF ower Pla Flow Co Valve ~ lo 80% Open w nt ntrol 300 400 500 600 700 800 900 1000 1100 Resource Flow Rate (gpm) Figure 10 – Evaporator Pressure Drop APPLICATION GUIDELINES Revision B – 09/23/2009 – Page 18 HTE66510 Evaporator Pressure Drop (psi)PDF Image | PURECYCLE POWER SYSTEM MODEL 280 Application Guide
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