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According to ASHRAE standard 34, the R-number of a chemical refrigerant is assigned systematically according to its molecular structure and has between two and four digits. If there are carbon-carbon multiple bonds, there are four digits in all: the number of these bonds is the first digit and the number of carbon atoms minus one (C-1) is next ...
R-407C is a mixture of hydrofluorocarbons used as a refrigerant. It is a zeotropic blend of difluoromethane (R-32), pentafluoroethane (R-125), and 1,1,1,2-tetrafluoroethane (R-134a). Difluoromethane serves to provide the heat capacity, pentafluoroethane decreases flammability, tetrafluoroethane reduces pressure. [1] R-407C cylinders are colored ...
Trichlorofluoromethane, also called freon-11, CFC-11, or R-11, is a chlorofluorocarbon (CFC). It is a colorless, faintly ethereal, and sweetish-smelling liquid that boils around room temperature. [5] CFC-11 is a Class 1 ozone -depleting substance which damages Earth's protective stratospheric ozone layer. [6]
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.
The Four Seasons discography. This is a list of singles and some albums recorded and released by Frankie Valli and/or The Four Seasons in their various guises since 1953. This list includes only commercially released singles on which Valli or some configuration of the group was credited with performing or producing.
The Four Seasons is an American vocal quartet formed in 1960 in Newark, New Jersey. Since 1970, they have also been known at times as Frankie Valli and the Four Seasons. The Four Seasons are one of the best-selling musical groups of all time, having sold an estimated 100 million records worldwide. [ 5]
A refrigerant is a working fluid used in the refrigeration cycle of air conditioning systems and heat pumps where in most cases they undergo a repeated phase transition from a liquid to a gas and back again. Refrigerants are heavily regulated because of their toxicity and flammability and the contribution of CFC and HCFC refrigerants to ozone ...
Four Seasons Hotels Limited, trading as Four Seasons Hotels and Resorts, is a Canadian luxury hotel and resort company [ 3] headquartered in Toronto, Ontario, Canada. [ 4] Four Seasons currently operates more than 100 hotels and resorts worldwide. [ 5] Since 2007, Bill Gates (through Cascade Investment) and Prince Al-Waleed bin Talal (through ...