Waste Heat Generators PDF Print E-mail

Thermal-to-electric generators are becoming more prevalent for micro turbines use as engineers become more familiar with the alternative. An ORC (Organic Rankin Cycle) can improve the electrical efficiency of a micro turbine from 30% to 39%. A Kalina Cycle can improve electrical efficiency from 30% to 39%. ORC’s are available for use on micro turbines today. Calnetix manufactures a 125 kW unit that will conveniently fit on the back end of 5 paralleled micro turbines. The Kalina Cycle has been utilized by industrial and geothermal applications for decades. Iteration is on the drawing board to accommodate the waste heat of micro turbines. An ORC may provide a greater economic benefit over absorption chillers – especially if the chillers are piped (with coolant) versus direct-fire: thermal waste heat of the turbine is impacted by the % glycol, inlet temperature and flow rate.


Many existing buildings cannot practically adapt to an absorption chiller due to pre-existing infrastructure or piping. Furthermore, many existing buildings cannot practically utilize waste heat during the heating season as well. Such is the case if the client utilizes steam heat or electric heat versus gas. On a much larger scale, Preon also promotes Waste Gas Systems (WGS). This is a gas sublimation process for municipalities that converts MSW (Municipal Solid Waste) to electricity: 200 tons per day of raw MSW will generate 5 MW continuously. The WGS is considered “renewable” energy and should be considered any time a source of MSW and 5 MW electric demand is recognized. WGS could become a dominant electricity provider as the need for “green” power is accelerated.