Converting Low Temp Waste Heat To Electricity

Can civilization keep itself from drowning in useless, waste heat?


(Yale Engineers Turn Wasted Heat Into Power)

It is estimated that recoverable waste heat in the U.S. alone could power tens of millions of homes. Although existing technologies can reuse high-temperature heat or convert it to electricity, it is difficult to efficiently extract energy from low-temperature heat waste due to the small temperature difference between the plant’s heat discharge and the surrounding environment. Additionally, conventional systems are designed to target a specific temperature difference, so they’re less effective when there are fluctuations in the output of waste heat.

Researchers at Yale’s Department of Chemical and Environmental Engineering have developed a new technology that overcomes these challenges. The key is a “nanobubble membrane” that traps tiny air bubbles within its pores when immersed in water. Heating one side of the membrane causes water to evaporate, travel across the air gap, and condense on the opposite side of the membrane. This temperature-driven flow of water across the membrane is then directed to a turbine to generate electricity.

To prove the concept, the team built a small-scale system and demonstrated that the nanobubble membranes could produce pressurized flows of water and generate power even with heat fluctuations and temperature differences as small as 20 degrees Celsius — making it feasible for use with the wasted heat from industrial sources. The findings were published online June 27 in the journal Nature Energy.

The researchers used nanostructured membranes with a surface chemistry that helps trap the air bubbles, keeping bubbles contained within pores even when large pressures are generated. These membranes, approximately as thick as two sheets of paper, were made from highly hydrophobic (water-repelling) polymer nanofibers.

I first read about this question in the early 1970's. In his 1970 novel Ringworld, Larry Niven had to help an entire species, the Puppeteers, with their waste heat problem. They are sentient herd animals whose vast cities and works cover their entire planet.

"I had explained," said Nessus, "that our civilisation was dying in its own waste heat. Total conversion of energy had rid us of all waste products of civilisation, save that one. We had no choice but to move our world outward from its primary."

"Was that not dangerous?"

"Very... we found that a sun was a liability rather than an asset. We moved our world to a tenth of a light year's distance, keeping the primary only as an anchor...
(Read more about the Puppeteer Kemplerer Rosette)

Via IndustryTap.

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