Page 239 - Boiler plant and distribution system optimization manual

224 Boiler Plant and Distribution System Optimization Manual

CONvERSION FACTORS

S.I. Units [Metric Units}
S.I. units are the International system Units that were adopted by the
General conference on weights and Measures in 1960 and subsequently en-
dorsed by the International Organization for Standardization.

The Base units of the- S.I. system

S.I Units Symbol
(1) Length meter m
(2) Mass kilogram Kg
(3) Time Second s
(4) Electric Current Ampere A
(5) Thermodynamic Temperature Kelvin K
[°C + 273 = °K]
(6) Luminous Intensity Candela cd

The following frequently used units are derived from the base ones.

S.I Units Symbol
(1) Force Newton N =Kg-m/s 2
(2) Pressure Pascals P=N/m 2
(3) Work, Energy, Heat Joule J=N-m
(4) Power Watt W=J/s

Other Important Units
Symbol
(1) Enthalpy H= j/Kg
(2) Entropy, Heat Capacity s = J/Kg-°k
(3) Dynamic Viscosity µ = N-s/m 2
(4) Thermal Conductivity K=W/m–°k
2
(5) Heat Transfer Coefficient h =W/M –°k

Prefixes
10 –6 micro
10 –3 milli
10 3 kilo
10 6 mega
10 9 Giga