The System Curve A fluid flow system is characterized with theSystem Curve- a graphical presentation of theEnergy Equation. The system head visualized in the System Curve above is a function of elevation - or the static head and themajor and minor lossesin the system and can be expressed as:...
Pump Curves eninepump(泵的曲线eninepump).pdf,Fluid flow pump system Pump Types Fluid flow applications can be divided into two categories: “low flow at high pressure” and “high flow at low pressure”. “Low flow at high pressure” applications incl
The pump curve used in the calculation will look like:The Colebrook equation is solved for f using Newton's method (Kahaner et al., 1989). The remaining calculations are analytic (i.e. closed form) except "Solve for V, Q", "Q known. Solve for Diameter", and "V known. Solve for ...
The energy of the pump system enclosed within the boundaries will be a combination of mechanical andthermal energy: (17.36)E=12Jω2+mu=2π2JN2+mu Hence, by differentiatingEand using the conditions of equation(17.35)in equation(3.34), we may write: ...
All these curves can be described in terms of interpolating functions, such as polynomials or splines, and used within equation-based models. In the context of Modelica models, one can use ready-made library models, where the functions describing the first and second characteristic curve are ...
and the method shall be agreed upon by the purchaser. Fan cooling for the bearing housing shall be the first choice. If fan cooling is inadequate, one of the plans in Annex B shall be selected. The cooling system shall be suitable for operationwith the coolant type, pressure and temperature...
the 25th percentile will not be in compliance with the standard. When calculating both PEICL and PEIVL, those values shown in column EL 2 are to be used for PERSTD. The PEI is the ratio of a pump’s energy rating divided by the energy rating of a minimally compliant pump (Equation 1...
In this paper, entropy generation theory is applied to a large-scale axial flow pump station system in reverse power generation operations, and the entropy generation method is used to investigate the accurate size and distribution of the mechanical energy dissipation of each component under different...
3.3) into the resulting equation gives the temperature rise of the fluid pumped: (3.7)ΔTf=H(1−ηp)778cηp where ΔTf = temperature rise in the fluid, °F H = head developed by the pump, ft c = specific heat capacity of the fluid, BTU/lb/°F ηp = pump efficiency, –. ...
The pressure p used in Equation 3.3.1 is the differential developed pressure (across the pump inlet and outlet). Since the inlet suction pressure is usually small compared to the discharge pressure, the discharge pressure is used. Thus, this is the application resistance pressure in most cases....