philadelphia Archives – The Green Optimistic green tech news, since 2008 Thu, 19 Apr 2012 17:11:05 +0000 en-US hourly 1 https://wordpress.org/?v=7.0 2667534 Sewage Geothermal Technology Used to Extract Free and “Filthy” Heat in Philadelphia https://www.greenoptimistic.com/sewage-geothermal-heat-20120419/ https://www.greenoptimistic.com/sewage-geothermal-heat-20120419/#respond Thu, 19 Apr 2012 17:11:05 +0000 https://www.greenoptimistic.com/?p=24088 Wastewater is and will always be warm, and its heat so far has usually been lost, without powering anything (but bacteria). To prevent this precious (filthy) energy go down the drain, NovaThermal Energy LLC, based in Philadelphia, wants to implement what they call a “sewage geothermal” technology, meant to recover most of it. “It’s just […]

The post Sewage Geothermal Technology Used to Extract Free and “Filthy” Heat in Philadelphia appeared first on The Green Optimistic.

]]> https://www.greenoptimistic.com/sewage-geothermal-heat-20120419/feed/ 0 24088 Philadelphia To Recover Subway Trains' Brake Forces In Huge Battery For Reuse/Resale https://www.greenoptimistic.com/philadelphia-subway-brake-recover-20100909/ https://www.greenoptimistic.com/philadelphia-subway-brake-recover-20100909/#respond Thu, 09 Sep 2010 11:39:53 +0000 https://www.greenoptimistic.com/?p=10151 Having a battery could someday be compared to having gold mine. Take Southeastern Pennsylvania Transportation Authority, for example. They' going to use a huge battery and charge it from the subway's braking trains. The energy recovered thus will either be sold back to the grid or reused for acceleration.

The post Philadelphia To Recover Subway Trains' Brake Forces In Huge Battery For Reuse/Resale appeared first on The Green Optimistic.

]]> https://www.greenoptimistic.com/philadelphia-subway-brake-recover-20100909/feed/ 0 10151