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Designation of Refrigerant

Designation of Refrigerant. Designation of Inorganic refrigerants These are designated by number 7 followed by the molecular weight of the refrigerant (rounded-off). R 7(molecular weight) Examples.: Ammonia: NH 3 Molecular weight is 17, ∴ the designation is R 717 2. Carbon dioxide:

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Designation of Refrigerant

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  1. Designation of Refrigerant V.P.Katekar, Department of Mechanical Engg, S.B.Jain Institute of Technology

  2. Designation of Inorganic refrigerants These are designated by number 7 followed by the molecular weight of the refrigerant (rounded-off). R 7(molecular weight) Examples.: Ammonia:NH3 Molecular weight is 17, ∴ the designation is R 717 2. Carbon dioxide: Molecular weight is 44, ∴ the designation is R 744 3. Water: Molecular weight is 18, ∴ the designation is R 718 V.P.Katekar, Department of Mechanical Engg, S.B.Jain Institute of Technology

  3. Designation of Fully saturated, halogenated compounds These refrigerants are derivatives of alkanes (CnH2n+2) such as methane (CH4), ethane (C2H6). V.P.Katekar, Department of Mechanical Engg, S.B.Jain Institute of Technology

  4. Refrigerants are internationally designated as “R” followed by certain numbers such as R – 11, R – 12, R – 114 etc. Refrigerants followed by a two digit number indicates that a refrigerant is derived from methane base. Refrigerants followed by three digit number indicates that refrigerant is derived from ethane base. Chemical Formula CmHnClpFq Chemical formula is correct, when: Complete numerical designation R(m-1)(n+1) (q) V.P.Katekar, Department of Mechanical Engg, S.B.Jain Institute of Technology

  5. Example :- Designate: Dichloro-tetrafluro-ethane   C2 Cl2 F4 CmHnClpFq m = 2 n = 0 p = 2 q = 4 n + p + q = 2m +2 0 + 2 + 4 = (2 x 2) + 2  6=6  Chemical formula is “Correct” R (m – 1) (n + 1) q R (2 – 1) (0 + 1) 4 R114 V.P.Katekar, Department of Mechanical Engg, S.B.Jain Institute of Technology

  6. Example : Designate- Dichlorodifluro methane C Cl2 F2 CmHnClpFq  m = 1 n = 0 p = 2 q = 2 n + p + q = 2m + 2 0 + 2 + 2 = 2 + 2 4=4 Balanced, Chemical Formula is Correct  R (m – 1) (n + 1) q R (1 – 1) ( 0 + 1) 2 R012 R12 V.P.Katekar, Department of Mechanical Engg, S.B.Jain Institute of Technology

  7. Example : Designate – Dichloro-monofluro – methane CmHnClpFq C H Cl2 F n + p + q = 2m + 2 1 + 2 + 1 = (2 x 1) + 2 4=4 Chemical Formula is correct R (m – 1) (n + 1) q R (1 – 1) (1 + 1) 1 R021 R21 V.P.Katekar, Department of Mechanical Engg, S.B.Jain Institute of Technology

  8. Example: Find the Name and chemical formula of R – 22 R22 R022 R (m – 1) (n + 1) q m – 1 = 0 n + 1 = 2 q = 2 m=1 n=1 q = 2 n + p + q = 2m + 2 1 + p + 2 = (2 x 1) + 2 P + 3 = 4 P=1 CmHnClpFq C1 H1 Cl1 F2 Monochloro – difluro – methane CHCLF V.P.Katekar, Department of Mechanical Engg, S.B.Jain Institute of Technology

  9. Example: Find the Name and chemical formula of R134 R (m – 1) (n + 1) q R 1 3 4 m-1=1 n+1=3 q=4 m=2 n=2 q=4 n + p + q = 2m + 2 2 + p + 4 = (2 x 2) + 2 P + 6 = 6 P=0 CmHnClpFq C2 H2 C0 F4 Tetrafluroethane V.P.Katekar, Department of Mechanical Engg, S.B.Jain Institute of Technology

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