Cv Calculation For Gas Metric

This value is equal to the change in enthalpy, that is, q p = n c p ∆t = ∆h.

Cv calculation for gas metric. G = specific gravity (air=1.0) t = flowing temperature absolute (ºf + 460) q = 34.3 cv p g the rate of flow of a liquid or gas through a valve depends upon numerous factors such as = mass flow in lbs/min r = universal gas flow constant (1545 ft lbf/(lb mol)(°r)) divided by m.w. The relationship between c p and c v for an ideal gas.

Is the standard flow rate which. To convert mass flow to volume, use the following equation: It is defined as the flow rate in cubic meters per hour [m3/h] of water at a temperature of 16º celsius with a pressure drop across the valve of 1 bar.

C v & flow calculator. Please contact us if the fluid specification requires viscosity correction. Specific gravity (1 for water) v:

To correctly model the pressure drop for the entered cv or kv value the density of the gas used in the calculation must be the density of the gas at the outlet of the valve/component. It allows you to calculate the flow or c v (flow coefficient) to make the relationship visible between the pressure drop (the difference in pressure between two points in a network transporting a liquid or gas) and the flow rate. From cv table, the corresponding valve position is 70% open.

When p2 is less than 1/2 p1, use 1/3 p1, for p2 in formula. Ft3 / 35.3 = m3/hr. This calculator can be used to help select a valve with enough flow capacity for a given application.

These regulations stipulate when and where the cv of gas is measured and the type of instrument to be used. You can use 40.0 as a default number if you don’t have the exact figure. In metric units, the same valve above with a specified opening giving cv = 1 will pass 0.862m3/hr of water (at 15 degree celsius) if 1bar pressure difference (δp) exist between upstream and downstream points on each side of the valve.