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Variable refrigerant flow (VRF), also known as variable refrigerant volume (VRV), is an HVAC technology invented by Daikin Industries, Ltd. in 1982. [1] Similar to ductless mini-split systems, VRFs use refrigerant as the primary cooling and heating medium, and are usually less complex than conventional chiller-based systems.
R-410A was invented and patented by Allied Signal (now Honeywell) in 1991. [5] Other producers around the world have been licensed to manufacture and sell R-410A. [6] R-410A was successfully commercialized in the air conditioning segment by a combined effort of Carrier Corporation, Emerson Climate Technologies, Inc., Copeland Scroll Compressors (a division of Emerson Electric Company), and ...
The ERMS was created by the Illinois Environmental Protection Agency (IEPA) in response to the Clean Air Act Amendments of 1990. Under the amendments, the Chicago metropolitan area was mandated to reduce ozone forming VOM emissions by 9% every 3 years from 1996 until the area reached attainment. Wishing to reduce emissions without imposing the ...
According to the 2021 census gazetteer files, Chicago Ridge has a total area of 2.27 square miles (5.88 km 2), all land. [7] Located in Cook County, the village is 18 miles (29 km) southwest of the Loop. Chicago Ridge's irregular shape is bounded by Oak Lawn on the north and east, Bridgeview and Palos Hills on the west, and Worth on the south. [5]
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The Ridge Historic District is a residential historic district in the Beverly and Morgan Park neighborhoods of Chicago, Illinois. As its name suggests, the district is centered on a ridge , making it one of the few areas of high ground in the generally flat city.