Bušotine i do dubine od 685 metara
Projektiranje i izvođenje radova trajalo je četiri godine i zahtjevalo je budžet od 164 miliona eura. Od početne faze projektiranja, pa sve do izvođenja, za radove je bio zadužen arhitektonski tim Murphy, Burnham, & Buttrick, koji je radio u suradnji sa firmama Landmark Facilities Group i PW Grosser. Postavljanje sistema, koji koristi geotermalnu energiju, predstavlja prvu intervenciju na katedrali Sv.Patrik u poslijednjih 70 godina, piše Inhabitat. Geotermalni sistem za hlađenje i grijanje sastoji se od deset stepenasto postavljenih bušotia koji idu i do dubine od 685 metara u zemlju. Bilo je potrebno puno planiranja ali i truda i preciznosti da se izvedu ovako duboke bušotine na lokalitetu koji vrvi od infastrukture postavljene ispod zemlje.
Smanjenje potrošnje energije
Kada sistem bude pušten u rad, on će smanjiti potrošnju energije u katedrali i do 30 posto, a ujedno će smanjiti prosječnu emisiju CO2 za oko 94.000 kilograma. Ova količina ušteđene energije i smanjene emisije CO2 značajna je za velike objekte, kao što je Sv. Patrik, koja se sa oko 7.060 kvadratnih metara smatra najvećom katoličkom gotskom katedralom u SAD. Čelnici katedrale Sv. Patrik smatraju da je njihova dužnost da doprinesu očuvanju planete i odgovorno upravljaju prirodnim resursima.
Warming Trend: Why New York Needs to Invest in Geothermal
New York City has nearly 1 million buildings and nearly all of them (roughly 900,000) could be heated and cooled by the earth without burning any fossil fuels. A recent report found that New York City was the most wasteful megacity in the world, and its buildings consume two-thirds of the energy we use. Over half of that energy is for space heating alone. Fossil fuels burnt for that purpose cause nearly 40 percent of CO2 emissions in America. Solar, wind and hydropower are all necessary if we’re going to provide electricity without accelerating climate change, but none of these are great for heating and cooling buildings. The leading technology for this is called ground source heat pumps, which use energy from the sun’s heat trapped just below the earth’s surface. As air temperature fluctuates wildly throughout the year, the ground 20 feet below the surface stays steady, between 50 and 60 degrees. Ground source heat pumps are exchange systems. In the winter, they absorb the heat from the earth, concentrate it with a heat pump, and deliver it throughout a building by ductwork. In the summer, they absorb the heat from the building and release it to the cooler earth. Currently, they have high upfront costs due to drilling and installation. But a recent study of the cost to switch in New York City showed that they quickly pay an impressive return-on-investment, breaking even within three to 12 years depending on what kind of system they replace. You might assume that such projects of this scope are unworkable in a dense city like New York, but there is massive, glorious proof of the possible in the very center of the city. St. Patrick’s Cathedral recently drilled and installed a new geothermal heating and cooling system. St. Patrick led the snakes out of Ireland—perhaps St. Patrick’s can lead the fossil furnaces out of New York. Once geothermal technology gains more attention, Bob Wyman, a local energy consultant, forecasts a tipping point, where the city bans the construction of new fossil fuel furnaces (a policy just enacted in Denmark). Such a ban on fossil fuel systems would spur a geoexchange explosion, as architects learn about the systems and financers capitalize on the long-term opportunity. The state can lower the barriers to acceptance of the technology by offering subsidies to homeowners and landlords. But the biggest motivation will come from high heating and cooling costs, as well as the unbearable cost to the city from climate change. Bill Nowack is the executive director of NY-GEO, and an expert in geothermal energy. According to one estimate he shared with me, between 80 and 90 percent of buildings can be heated by ground source heat pumps. It is not for every part of the city and will be easiest to incorporate in the outer boroughs and more residential areas without existing underground infrastructures. An estimate by John Rhyner—a licensed professional geologist—showed that almost all of Staten Island, 70 percent of Queens, and half of Brooklyn residential footage could be heated with this technology. According to Mr. Nowak, the installers are already doing brisk business as word spreads, but the lack of governmental support for the technology has made progress far slower than it could be. Last year, Gov. Andrew Cuomo vetoed two bills that would have done the most toward jump-starting the geoexchange revolution. His support for the ground source heat pump future will be critical. We have the breakthrough technology; all we need is breakthrough politics to build a city of the future, harvesting the steady heat of the earth. New York City is an island city. It is one of the most vulnerable cities in the world to climate change. The city we love will drown if we don’t lead the world in clean energy. It is time to dig deep.
NYC’s St. Patrick’s Cathedral goes green with new geothermal plant
When St. Patrick’s Day revelers parade past St. Patrick’s Cathedral on NYC’s 5th Avenue today, they will be celebrating not just the patron saint of Ireland, but also a renewable energy future for the famous landmark. Last month, the Archdiocese of New York announced that the historic Saint Patrick’s cathedral activated a new geothermal heating and cooling system that will reduce the building’s energy consumption by more than 30 percent and reduce CO2 emissions by approximately 94,000 kilograms – an impressive feat for the largest Catholic Gothic cathedral in the United States. St. Patrick’s geothermal plant is part of the final phase of a four-year, $177 million renovation that has been overseen by the cathedral’s architectural design team of Murphy, Burnham, & Buttrick working in partnership with Landmark Facilities Group and PW Grosser. It is the institution’s first restoration in more than 70 years (it was dedicated in 1879). The geothermal heating and cooling system consists of 10 wells in terraces flanking the north and south sides of the cathedral drilled through dense Manhattan schist (a coarse-grained metamorphic rock) to a depth of up to 2,250 feet. When fully activated, the plant will be able to generate 2.9 million BTUs per hour of air conditioning and 3.2 million BTUs per hour of heating through 76,000 square feet of space. While wind and solar grab a bigger share of the renewables market and garner more media attention, the potential for both geothermal electricity and heating is huge. The global geothermal power market is projected to more than double operating capacity to 32 gigawatts by the early 2030s, according to the US and Global Geothermal Power Production Report from the US Geothermal Energy Association. Currently only 6 to 7 percent of the world’s estimated geothermal potential is being harnessed. The Archdiocese of New York and St. Patrick’s Cathedral are not as interested in tapping the geothermal market as they are in heeding the call of Pope Francis to protect the planet and conserve God’s creation as written in his 2015 encyclical on the environment, Laudato Si. “A consistent ethic of life does not compartmentalize these issues. It prioritizes life and the preservation of life at every level,” said Cathedral Rector Monsignor Robert T. Ritchie. “One of the most basic ways in which we are called to do so is through responsible stewardship of our natural resources.”