Heat Transfer

Shipboard Waste Heat Recovery System to Be Demonstrated

11 January 2018

A joint venture involving ElectraTherm, the U.S. Office of Naval Research (ONR), Creare and the U.S. Naval Academy (USNA) will demonstrate gas turbine waste heat recovery as part of a Small Business Innovation Research project. The project is designed to prove the potential for waste heat recovery on board ships.

ElectraTherm’s Power+ Generator® captures low temperature waste heat to generate fuel-free, emission-free Schematic of the Power+ Generator ORC system. Source: ElectraThermSchematic of the Power+ Generator ORC system. Source: ElectraThermpower. At the USNA in Annapolis, Md., this system will capture the waste heat from an existing helicopter turbine used to train the USNA Midshipmen. Equipped with a custom designed exhaust gas heat exchanger provided by Creare, the 390 HP helicopter turbine’s exhaust will be converted to hot water — the fuel for the ElectraTherm Organic Rankine Cycle (ORC) — and the Power+ Generator will convert that exhaust into approximately 50kW of gross power. The demonstration will offer proof of concept for significant fuel savings via turbine or reciprocating engine waste heat streams aboard ships, a waste heat recovery source readily available but underutilized.

ElectraTherm taps the ORC and proprietary technologies to generate power from low temperature heat ranging from 170-252 degrees Farenheit. Hot water is the only fuel consumed by the Power+. The waste heat is used to produce a high pressure vapor that expands through ElectraTherm’s twin screw power block, spinning an electric generator to provide emission-free power. After spinning the expander, the vapor is condensed back into liquid through a liquid loop radiator.

The Power+ Generator can also be deployed to harness waste heat in applications such as internal combustion engines, biomass boilers, flare gas (at oil and gas wells, wastewater treatment plants and landfills) and geothermal/co-produced fluids.

To contact the author of this article, email sue.himmelstein@ieeeglobalspec.com

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