아메리칸 워터(American Water, AW)는 미국 최대의 물과 폐수 관련 회사로 뉴욕에 있는 자회사가 큰 건물에 대해 가열과 냉각 방식을 이용한 지열 신기술을 도입했다고 최근 발표했다. 이번 연구는 기존의 지열시스템을 변환해 재생에너지를 새롭게 응용하는 프로그램을 소개한다.

AW의 지열시스템은 열 교환기를 통과시켜서 물의 열적 특성을 이용해 밸리 스트림(Valley Stream)마을의 윌리엄 L. 벅(William L. Buck) 초등학교에 적용했다. 이는 1950년대부터 존재해 온 기존 지열방식에서 출발했다.

American Water (AW), the largest publicly traded U.S. water and wastewater utility company, has announced that its subsidiary in New York is piloting a geothermal innovation to heat and cool larger buildings. The new research and development pilot could transform traditional geothermal systems and introduce a new application in renewable energy.

The AW geothermal system at the William L. Buck Elementary School in Valley Stream, N.Y., uses the thermal properties of the water as it passes through a heat exchanger. It is a departure from traditional geothermal -- which has been in existence since the 1950s -- by eliminating the need to drill over a hundred deep geothermal boreholes, thereby significantly reducing initial construction costs. During this phase of the pilot program, after the water passes through the heat exchanger, it is returned to the aquifer via a diffusion well.

"American Water is taking a creative approach to traditional geothermal and developing a new application that will lower energy costs and reduce a building's carbon footprint," said William M. Varley, senior vice president of AW's Northeast Division. "We are providing heating and cooling for a 40,000-square-foot school without utilizing fossil fuel in the winter months."

Temperatures in each classroom can be individually controlled, and with the AW geothermal system in operation, administrators, teachers and students have a much more comfortable learning environment. For the first time ever, the William L. Buck Elementary School can be cooled in summer, enabling the school district to relocate summertime programs and events to the facility.

Construction of the geothermal system began in September 2014 with crews working at night without any disruption to student learning. By February 2015, duct work was complete, the heating and cooling geothermal console units had been installed in each classroom, and the system was put into service.

[출처 = Water World / 2015년 7월 15일]