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
The Full Monteverdi The Full Monteverdi The Full Monteverdi is a 2007 British film written and directed by John La Bouchardière and based on his live production of the same name, itself based on Claudio Monteverdi's fourth book of madrigals (1603) which, in turn, is a collection of settings of poems by such Italian renaissance poets as Giovanni Battista Guarini, Ottavio Rinuccini and Torquato Tasso. The film features the British vocal ensemble I Fagiolini and the original cast of actors from the live production. The title is a play on the name of the 1997 film The Full Monty. The plot concerns six