Ejector Design Calculation Xls Fixed Jun 2026

The fluid velocity in the diffuser throat is sonic. These units are sensitive to "off-design" conditions; increasing motive pressure may actually lower suction capacity.

Use VBA macros to pull steam properties automatically so you don't have to input them manually for every pressure change.

ω = m_s / m_m

Slows down the mixed fluid, converting kinetic energy back into pressure. 2. Core Mathematical Formulas ejector design calculation xls fixed

When users report a "broken" XLS design sheet, the root cause is usually broken references or unconverged loops. Resolving #NUM! and #VALUE! Errors

For a fixed nozzle, the motive steam flow is calculated based on the nozzle throat diameter and the motive fluid's pressure and temperature. A common formula for motive flow involves:

Sizes the constant area section to ensure effective momentum transfer between the motive and suction fluids. Diffuser Geometry: The fluid velocity in the diffuser throat is sonic

The spreadsheet performs the following sequential calculations based on the HEI (Heat Exchange Institute) standards: Entrainment Ratio (

An ejector uses a high-pressure motive fluid to accelerate and entrain a low-pressure suction fluid, discharging the mixture at an intermediate pressure. This process relies entirely on the conversion of pressure energy into kinetic energy, and back into pressure energy. Core Components of an Ejector

Used to calculate mixing efficiency and velocity after mixing. ω = m_s / m_m Slows down the

If entraining a gas lighter than air (e.g., Hydrogen), use the Heat Exchange Institute (HEI) entrainment correction factors to adjust the apparent mass flow rate. Conclusion

Are the temperature and molecular weight correction factor curves properly digitized into Excel VLOOKUP or INDEX/MATCH tables? Units Consistency: Are the gas constants ( ) matching the mass units (kg vs lbs)?

An ejector works on the Bernoulli principle, where a high-pressure passes through a converging-diverging nozzle, creating a high-velocity, low-pressure jet. This jet entrains a suction fluid , mixes with it, and then decelerates in a diffuser to a higher discharge pressure.

If your pressure ratio is too high for a single stage, the XLS should flag the need for a multi-stage system with inter-condensers. Finding a Reliable Calculation Sheet

Program these specific Excel formulas into your calculation block to automate the design: =B6/B3 (Suction Flow / Motive Flow)