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## Piping, Plumbing Abbreviation

As isometric piping drawing become denser in information and crowded with compound, the piping engineer start to use piping abbreviations in the design work to reduce the space requirement of the callout of the fitting or in the note section of the mechanical piping drawing.   The list below includes most of the piping abbreviation used…

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## Dimensionless Numbers in Heat Transfer

Biot number (Bi) The Biot number, Bi is dimensionless, which is ratio between of the internal and external resistance. where h is the average heat Transfer coeficient. L length dimention, The ratio between the volume and the surface area. k thermal conductivity. Drag coefficient (Cf) The drag coefficient is the ratio of surface shear stress…

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## Prandtl Number of Water

Prandtl number of water Pr = μ cp / k Where:  cp : specific heat, (SI units: J/kg·K). μ : dynamic viscosity, (SI units: Pa s = N s/m2).   k : thermal conductivity, (SI units: W/m·K). The specific Heat, dynamic viscosity and the thermal conductivity required for the calculation of Prandtl number of the water were calculated…

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## Prandtl Number Of Nitrogen

Prandtl Number Of Nitrogen Table Prandtl number of nitrogen at different pressure @ 1 bar: Property values generated from NIST Database 23: REFPROP Version 7.0 (August 2002). Prandtl Number Of Nitrogen Figure More about Prandtl Number : Prandtl Number Calculator. Pandtl number of Air NITROGEN PRODUCTION FROM AIR Prandtl Number of Oil Prandtl Number Of…

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## Prandtl Number of Air

The prandtl number of air is around 0.7 as many other gases at 1 atm.The Prandtl Number is a dimensionless number approaching the proportion of momentum diffusivity and thermal diffusivity.Prandtl number equation is defined as: where:ν is the kinematic viscosity, ν = μ / ρ. μ is dynamic viscosity, (SI units: Pa s = N…

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## Different Types of Refrigerants

In the last decade the manufacturer developed different types of refrigerants.  The mechanical vapor compression cycle utilizes the evaporation of a refrigerant to absorb the heat, which will lead to lower the temperature of the surrounding of the evaporator. The first refrigerant used in the word was Ether in 1834 when Perkins proposed a hand…