can be used to iteratively find the friction factor or optimal flow rate based on the Darcy-Weisbach or Colebrook-White equations. Resources and Technical Guides Scribd Spreadsheet Guide:
To illustrate the use of the ejector design calculation XLS fixed, let's consider an example. Suppose we want to design an ejector to boost the pressure of a suction fluid from 100 kPa to 200 kPa using a motive fluid at 500 kPa. The flow rates of the motive and suction fluids are 1 kg/s and 0.5 kg/s, respectively. The fluid properties are:
Often called the "back pressure." If the actual back pressure exceeds the design discharge pressure, the ejector will "break" and lose vacuum rapidly. Step-by-Step Design Logic in XLS ejector design calculation xls fixed
The "Fixed" version of this calculation sheet refers to an ejector with a non-adjustable nozzle position
Using the ejector design calculation XLS fixed, we can calculate the ejector's performance as follows: can be used to iteratively find the friction
, specific constants (A through J) are used in empirical correlations to determine Non-Choked Flow: For compression ratios is less than 1.8 , a different set of constants is applied. Motive Mass Flow Rate: For a fixed nozzle, the mass flow rate (
To build an accurate mathematical model in Excel, you must first understand the internal fluid dynamics of an ejector. An ejector operates on the Venturi effect and is divided into three primary zones: The flow rates of the motive and suction
Calculates the length and exit diameter required to convert kinetic energy back into static pressure ( cap P sub d 4. Technical Specifications & Formulas The XLS uses the following primary governing equations: Mass Balance: Velocity of Steam: is nozzle efficiency). Motive Flow: 5. Features of the "Fixed" XLS Version Performance Curves: