About half of the heat generated world wide for purposes other than heat production, meaning electricity production, industrial processes, etc., is wasted. This waste heat represents an enormous opportunity, and challenge, for low cost, low pollution, power generation. Here is a list of links, that I have accumulated over the past couple of years, to companies with working devices that can turn waste heat into useful energy.
Recycled Energy Development – “Businesses that consume a lot of power usually emit significant amounts of waste energy. Manufacturers like steel mills and wall board makers, for example, produce substantial amounts of excess heat. RED takes this heat and converts it into clean electricity, processed steam, or other useful energy. Even processes that generate energy as a byproduct, such as natural gas pipeline pressure drops or industrial gas flares, can yield big benefits. Our job is to squeeze every possible drop of energy out of industrial processes—dramatically improving efficiency and reducing costs.”
WOW Energies – “… Capture nearly any industrial waste heat to produce electrical power. Waste heat sources can be in the form of exhaust stack flue gases, waste heat from vented steam, steam discharged from steam turbines, gas flaring, as well as hot water, hot oils, or combined waste heat sources.”
Ener-G-Rotors – “Ener-G-Rotors is commercializing devices based on a near frictionless gerotor expander in an organic Rankine cycle that turns low temperature heat into electricity …”
GMZ Energy – “GMZ Energy is the industry leader in ThermoVoltaics; economically viable energy solutions based on direct heat to electricity conversion.”
Echogen Power Systems – “Echogen’s target customer groups include power generation and large energy consumers in the Industrial sector with waste heat recovery opportunities found in their respective steam generating and direct-fired heating processes (e.g., furnaces, kilns, etc.). Prospective Industrial customer groups include chemical processing, petroleum refining, iron, steel, etc., typically operating with large sources of energy loss from hot exhaust gases and residual heat in liquid product streams.”
ReGen Power Systems – “ReGen’s core technology is its proprietary heat engine that operates at temperature differentials well below those of most other engines. Our initial designs call for operating temperatures of 250 degrees Centigrade and 100 degrees Centigrade.
The 250ºC engine will convert industrial exhaust heat to power, converting the energy from a temperature differential of 230 degrees. Such heat streams are produced heavily in industries like steel, aluminum, glass, ceramics and cement. This engine will operate at 25% efficiency and will be produced in output sizes between 500kW and 2MW.
The 100ºC engine will act as a steam condenser, extracting the latent heat of condensation from low pressure steam as it condenses on the hot heat exchanger of the engine. The paper, chemical and oil refining industries condense large amounts of low pressure steam for reuse. This model will produce power between 250kW and 1MW, operating at 13% efficiency.”