D o Outer helix diameter (m) D i Inner helix diameter (m) De Dean number, De = Re √ (a/R) d i Inner diameter of coil (m) h i Inner convective heat transfer coefficient (W/m 2 K) h o Outer convective heat transfer coefficient (W/m 2 K) k Thermal conductivity (W/m K) L Length of coil (m) m Mass flow rate of cold water (kg/s) M Dimensionless number, M = Re 0.64 0.26(a/R) 0.18
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