@article{ref1,
title="Energy Efficiency Arrives at the Pittsburgh Tunnels",
journal="APWA reporter",
year="2008",
author="Thorton, Ken and Peterson, Chris",
volume="75",
number="7",
pages="66-67",
abstract="This article is a case study of the implementation of energy efficient ventilation systems in Pittsburgh tunnels. Due to the age of the tunnels, the ventilation systems were expensive to maintain and run. The Pennsylvania Department of Transportation (PennDOT) volunteered for the Strategic Environmental Management Program (SEMP), which investigated the environmental effects of all divisions, and led to the purchase of the new tunnel fan motors. The new motors use fewer amps, and have infinitely variable speeds instead of just high, medium, and low. The speed is also automatically adjusted depending on carbon monoxide levels. These new fans have saved PennDOT $215,000 per year by cutting energy demands and repair costs.<p />",
language="",
issn="0092-4873",
doi="",
url="http://dx.doi.org/"
}