Ejector Design Calculation Xls -

Ejector design calculation spreadsheets focus on two primary mechanical goals: predicting the Entrainment Ratio (

• Built-in steam tables (via VBA user-defined functions) for steam.
• External REFPROP links (via COM add-in) for complex gases.
• Approximate polynomials for ideal gases.

3. Key Definitions and Symbols

• m_p: motive mass flow (kg/s)
• m_s: suction mass flow (kg/s)
• m_t = m_p + m_s: total discharge mass flow (kg/s)
• P_p, T_p: motive inlet pressure and temperature
• P_s, T_s: suction inlet pressure and temperature
• P_d: discharge pressure
• h, s: specific enthalpy, entropy
• V: velocity (m/s), A: area (m^2)
• ρ: density (kg/m^3)
• β = m_s / m_p: entrainment ratio
• η_n: nozzle isentropic efficiency
• K: loss coefficient (head loss as fraction of dynamic pressure)

A detailed ejector calculation XLS typically includes the following logical sheets or sections: Operating Conditions Input : Users define the Motive fluid pressure ( cap P sub p ), Suction/Entrained fluid pressure ( cap P sub e ), and Discharge/Condenser pressure ( cap P sub c Compression & Expansion Ratios Compression Ratio ( cap C sub r The ratio of discharge pressure to suction pressure ( Expansion Ratio ( cap E sub r The ratio of motive pressure to suction pressure ( Entrainment Ratio ( ejector design calculation xls