It’s the most wonderful time of the year, which means that New York’s most iconic Christmas tree is lit, the rink at Rockefeller Center is busy and the Rockettes are performing. However, few realize the amount of energy that is required to keep building occupants and the tourists walking through the New York sites comfortable and happy. The amount of energy, especially at peak times, is expensive and negatively impacts our environment and electric grid. Can energy that is consumed during off peak periods and stored for later use help solve these problems and help to reduce the peak electricity demands, improve utility load factor and make renewables more viable even in the cold of winter?
The Real Magic
New York City is more than just a tourist destination, consisting of over 800,000 buildings. Although the above ground attractions get all the attention, the real magic happens in the basements and on the roofs, where ice-based thermal energy storage is in place at properties such as Rockefeller Center, Morgan Stanley and 11 Madison Avenue. On summer nights, when energy prices are nearly 70 percent discounted compared to daytime prices and energy is generated more efficiently, cooling is created and stored in the form of ice by a chiller. The next day the ice is melted to cool the building unbeknownst to occupants.
During the winter, when cooling loads are lower due to colder outside temperatures, the typical ice melt times for one iconic building is 15 hours. Ice can be used to meet cooling loads during the day with chillers only running at night. While many may not think to cool buildings in winter, large buildings require some cooling due to heat emitted from people, lighting and computers. During the summer, ice is burned for six hours (usually 12 noon to 6 p.m.) throughout peak demand上海千花网