Stanford University has installed a unique heat recovery system, SESI, which can reduce 68% of greenhouse gas emissions and reduce fossil fuel use by 65%. More like a small city, the California Stanford campus has 8,000 acres of land, more than 1,000 buildings, before the annual carbon dioxide emissions up to 150,000 tons, the full deployment of a new heat recovery system, Stanford University has become the world's most environmentally friendly One of the universities. The former natural gas pipeline system was commissioned in 1987. This system includes underground steam pipe heating systems, while the cold water pipes provide cooling systems. Computer buildings, laboratories, classrooms, and other buildings often require heating and cooling systems to work at the same time to achieve reasonable room temperature. However, with the expansion of the park's growth, this system often experienced intermittent failures, and universities had to purchase relatively expensive energy from the grid. Engineers noticed that about 75% of the campus chilled water loops and steam loops overlap with heat, and the excess heat is simply discharged as waste heat through an evaporative cooling tower, a new one. The idea of ​​heat recovery system SESI was born. Joe Stagner, executive director of the Sustainable Development and Energy Management Office at Stanford University, said. “Using an electric heat pump to recover the residual heat from the cooling system allows these hot waters to re-enter the heating cycle on campus, which can greatly increase efficiency. We can abandon natural gas for power generation, use new heat recovery systems to effectively use renewable energy, and significantly reduce air pollution. "The most important source of green electricity for SESI is California's 121 hectare solar power station, which has a peak power of 68 MW, and a total of 5 MW of solar panels installed on the roof of the campus, which can provide about 53% of electricity to Stanford University. The rest is purchased by the university from the California power grid, and 25% of it comes from renewable sources, which means that 65% of university energy is green and sustainable.
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