Our Plymouth Mill has taken another step toward a more sustainable future thanks to the success of a recent resource conservation project. Just one year after the installation of a cooling tower and new heat exchangers, the mill’s closed-loop system for heating process water has exceeded expectations by dramatically reducing daily water consumption and fuel costs. Last May, the team installed a cooling tower and two large heat exchangers to reclaim waste heat from the mill and use it to reduce steam consumption. While the resource conservation project was originally expected to eliminate the use of about 11 million gallons of river water per day, Operations Manager David Council says the system is performing better than expected, saving approximately 18 million gallons of water per day. Before the team installed the new equipment, the mill used water from the nearby Roanoke River to cool mill processes. The mill returned the water to the river in the same condition, only slightly warmer. With the addition of the cooling tower and heat exchangers, the mill now has a closed-loop system that reclaims heat from the mill’s evaporation equipment and transfers it to process water. The reclaimed heat reduces the mill’s steam load, which means it burns less fuel in the boilers to make steam.
Visitation at U.S. National Parks may potentially increase with increasing temperature in temperate areas, but may decrease with temperatures rising over 80 degrees Fahrenheit, according to a study using future climate and visitation modeling scenarios published June 17 in the open-access journal PLOS ONE by Nicholas Fisichelli and colleagues from U.S. National Park Service.
Climate change may affect not only natural and cultural resources within protected areas, but also park tourism. To assess the relationship between climate and park visitation, the authors of this study evaluated historical monthly mean air temperature and Park service visitation data (1979-2013) at 340 parks, ranging from Guam to Alaska, and projected potential future visitation (2041-2060) based on two warming-climate scenarios and two visitation-growth scenarios.
Of the original 340 parks assessed, over 80percent showed strong relationships between visitation and temperature. Visitation generally increased with increasing average monthly temperature, but decreased strongly with temperatures over 77 degrees Fahrenheit (25 degrees Celcius). Future visitation varied across parks, but the authors found that many high-latitude and high-elevation parks showed increases in potential visitation, especially during the spring and fall seasons. Parks with historically warm temperatures showed a potential future decrease in visitation during the hottest months, and tropical parks with small temperature variation throughout the year showed no relationship to temperature. Although very warm months at some parks may see decreases in future visitation, this potential change represents a relatively small proportion of visitation across the national park system. The authors suggest that protected areas that develop adaptation strategies for these changes may be able to both capitalize on opportunities and minimize detriment related to changing visitation.
read more/source: http://www.enn.com/ecosystems/article/48676