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6. Condenser The low pressure vapor leaving the expander goes through the condensers. Here, remaining heat is transferred out of the working fluid via additional brazed plate heat exchangers, causing the vapor to condense back into a liquid. 7. Generator The ElectraTherm Green Machine uses an induction generator for electrical energy production. Induction generators have no slip rings, brushes, or field control; they are electro-mechanically very similar to induction motors, having the same reliability and value. Their operation is similarly simple; being asynchronous, they do not require synchronization to the grid prior to connection. Voltage and frequency are determined from the site grid conditions. Because induction generators are not self- excited and have no magnetization or terminal voltage prior to coming on-grid, synchronization is rendered meaningless. (Often users confuse the induction generator with a synchronous generator or alternator which has stand-alone terminal voltage when it rotates, and requires synchronization before being placed on-grid, or active throttle and excitation control as a stand-alone device). Green Machines cannot be operated without a grid connection. 8. Control System with Remote Monitoring The onboard programmable logic controller (PLC) and human machine interface (HMI – a touch screen device) provide both remote and local access to all operational controls, as well as selected machine parameters such as temperatures, pressures, and electrical metering. An internet connection is required for operation. 9. Power Factor Correction The Green Machine is equipped with power factor correction via a delta-connected capacitor and associated discharge and control circuitry. Power factor remains above 0.93 over the entire operating range, and typically is in the 0.96-0.99 range. 10. Working Fluid The Green Machine uses HFC-245fa as a working fluid for the ORC. HFC-245fa (1,1,1,3,3 pentafluoropropane) is an EPA-approved member of the hydrofluorocarbon (HFC) family of refrigerants, permitted under the Montreal Protocol. This non-flammable, low-toxicity, environmentally safe fluid boils at ~ 60°F (15.5°C) at atmospheric pressure. HFC-245fa is ozone safe and generally safe to handle. 11. Lubrication The twin screw expander is lubricated by a synthetic ISO 100 polyolester (POE) oil. This oil is mixed with the working fluid as part of ElectraTherm’s proprietary in-process lubrication technology. Copyright © ElectraTherm, Inc. 2013. All Rights Reserved. REV 02 - 05/02/2013 Page | 9PDF Image | Waste Heat to Power System Product Data and Specification Guide
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