Numbering of refrigerants Number of carbon(C)-1 Number of fluorine (F) R143a Number of hydrogen(H)+1 This gives the following: Letter code says that this is a Isomer. C=1+1=2 That means the refrigerant consist H=4-1=3 of the same number of atoms,but the F=3 molecule have a different composition Therefore:C2H,F3 ONTNU ②SINTEF Numbering of natural refrigerants Example: Carbon dioxide(CO2) R744 Ammonia(NHg) R717 Description is composed by the number 7 molar weight 回NTNU SINTEF7 Numbering of refrigerants R143a Number of carbon (C) -1 Number of fluorine (F) Number of hydrogen (H) +1 This gives the following: C = 1 + 1 = 2 H = 4 – 1 = 3 F = 3 Therefore: C2H3F3 Letter code says that this is a Isomer. That means the refrigerant consist of the same number of atoms, but the molecule have a different composition 8 Numbering of natural refrigerants Example: Carbon dioxide (CO2 ) R744 Ammonia (NH3 ) R717 Description is composed by the number 7 + molar weight