Heat pump the brand name Freon, a trademark of DuPont. Its manufacture is now banned or severely restricted by the Montreal Protocol of August 1987 because of the damage that CFCs cause to the ozone layer if released into the atmosphere. One widely adopted replacement refrigerant is the hydrofluorocarbon (HFC) known as R-134a (1,1,1,2-tetrafluoroethane). Heat pumps using R-134a replaced R-12 (dichlorodifluoromethane) and have similar thermodynamic properties but with insignificant ozone depletion potential and a somewhat lower global warming potential. Other substances such as liquid R-717 ammonia are widely used in large-scale systems, or occasionally the less corrosive but more flammable propane or
1987 Montreal Alouettes season 1987 Montreal Alouettes season The 1987 Montreal Alouettes played two preseason games before folding on June 24, 1987, just one day before their scheduled Thursday game against the Toronto Argonauts. The many years of bad ownership and dwindling fan support finally led to the CFL pulling the plug on the franchise and folding them. Since Sam Berger sold the team in 1981, it had shaky ownership and years of poor football performances, only playing .500 ball once (in 1985) and making the playoffs twice (winning only one game in 1985), leading to it playing in a to near-empty Olympic Stadium