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Ram Efficiency Calculator

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Air Refrigeration Systems Air Refrigeration Cycles

✖Stagnation Pressure of System is the total pressure of the air refrigeration system, including the static and dynamic pressure of the air at a given point.ⓘ Stagnation Pressure of System [p₂']			+10% -10%
✖Initial Pressure of System is the pressure of the refrigerant at the starting point of the air refrigeration system, which affects the overall performance.ⓘ Initial Pressure of System [P_i]			+10% -10%
✖Final Pressure of System is the ultimate pressure of the air refrigeration system after the refrigeration process is complete.ⓘ Final Pressure of System [P_f]			+10% -10%

✖Ram Efficiency is the measure of the performance of an air refrigeration system in converting the input energy into useful cooling effect.ⓘ Ram Efficiency [η]

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Ram Efficiency Solution

STEP 0: Pre-Calculation Summary

Formula Used

Ram Efficiency = (Stagnation Pressure of System-Initial Pressure of System)/(Final Pressure of System-Initial Pressure of System)
η = (p₂'-P_i)/(P_f-P_i)
This formula uses 4 Variables

Variables Used

Ram Efficiency - Ram Efficiency is the measure of the performance of an air refrigeration system in converting the input energy into useful cooling effect.
Stagnation Pressure of System - (Measured in Pascal) - Stagnation Pressure of System is the total pressure of the air refrigeration system, including the static and dynamic pressure of the air at a given point.
Initial Pressure of System - (Measured in Pascal) - Initial Pressure of System is the pressure of the refrigerant at the starting point of the air refrigeration system, which affects the overall performance.
Final Pressure of System - (Measured in Pascal) - Final Pressure of System is the ultimate pressure of the air refrigeration system after the refrigeration process is complete.

STEP 1: Convert Input(s) to Base Unit

Stagnation Pressure of System: 150000 Pascal --> 150000 Pascal No Conversion Required
Initial Pressure of System: 85000 Pascal --> 85000 Pascal No Conversion Required
Final Pressure of System: 160000 Pascal --> 160000 Pascal No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

η = (p₂'-P_i)/(P_f-P_i) --> (150000-85000)/(160000-85000)

Evaluating ... ...

η = 0.866666666666667

STEP 3: Convert Result to Output's Unit

0.866666666666667 --> No Conversion Required

FINAL ANSWER

0.866666666666667 ≈ 0.866667 <-- Ram Efficiency

(Calculation completed in 00.004 seconds)

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Created by Rushi Shah

K J Somaiya College of Engineering (K J Somaiya), Mumbai

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Verified by Venkata Sai Prasanna Aradhyula

Birla Institute of Technology & Science (BITS), Hyderabad

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< Air Refrigeration Systems Calculators

Temperature Ratio at Start and End of Ramming Process

LaTeX Go Temperature Ratio = 1+(Velocity^2*(Heat Capacity Ratio-1))/(2*Heat Capacity Ratio*[R]*Initial Temperature)

Ram Efficiency

LaTeX Go Ram Efficiency = (Stagnation Pressure of System-Initial Pressure of System)/(Final Pressure of System-Initial Pressure of System)

Local Sonic or Acoustic Velocity at Ambient Air Conditions

LaTeX Go Sonic Velocity = (Heat Capacity Ratio*[R]*Initial Temperature/Molecular Weight)^0.5

Initial Mass of Evaporant Required to be Carried for given Flight Time

LaTeX Go Initial Mass = (Rate of Heat Removal*Time in Minutes)/Latent Heat of Vaporization

< Air Refrigeration Calculators

Compression or Expansion Ratio

LaTeX Go Compression or Expansion Ratio = Pressure at End of Isentropic Compression/Pressure at Start of Isentropic Compression

Relative Coefficient of Performance

LaTeX Go Relative Coefficient of Performance = Actual Coefficient of Performance/Theoretical Coefficient of Performance

Energy Performance Ratio of Heat Pump

LaTeX Go Theoretical Coefficient of Performance = Heat Delivered to Hot Body/Work Done per min

Theoretical Coefficient of Performance of Refrigerator

LaTeX Go Theoretical Coefficient of Performance = Heat Extracted from Refrigerator/Work Done

Ram Efficiency Formula

LaTeX Go

Ram Efficiency = (Stagnation Pressure of System-Initial Pressure of System)/(Final Pressure of System-Initial Pressure of System)
η = (p₂'-P_i)/(P_f-P_i)

What is Ram Efficiency?

Ram efficiency is a measure of how effectively the dynamic pressure of incoming air is converted into useful work or energy in an aircraft's propulsion system. It is defined as the ratio of the actual increase in pressure and temperature of the air due to ram effect to the ideal or theoretical values that could be achieved under perfect conditions. High ram efficiency indicates that the system is effectively utilizing the kinetic energy of the incoming air to improve performance, while low ram efficiency suggests potential losses or inefficiencies in the process.

How to Calculate Ram Efficiency?

Ram Efficiency calculator uses Ram Efficiency = (Stagnation Pressure of System-Initial Pressure of System)/(Final Pressure of System-Initial Pressure of System) to calculate the Ram Efficiency, Ram Efficiency formula is defined as the ratio of the difference between the power output of the refrigerant at the evaporator outlet and the power input to the compressor, to the difference between the power input to the compressor and the power input to the compressor at zero load. Ram Efficiency is denoted by η symbol.

How to calculate Ram Efficiency using this online calculator? To use this online calculator for Ram Efficiency, enter Stagnation Pressure of System (p₂'), Initial Pressure of System (P_i) & Final Pressure of System (P_f) and hit the calculate button. Here is how the Ram Efficiency calculation can be explained with given input values -> 0.866667 = (150000-85000)/(160000-85000).

FAQ

What is Ram Efficiency?

Ram Efficiency formula is defined as the ratio of the difference between the power output of the refrigerant at the evaporator outlet and the power input to the compressor, to the difference between the power input to the compressor and the power input to the compressor at zero load and is represented as η = (p₂'-P_i)/(P_f-P_i) or Ram Efficiency = (Stagnation Pressure of System-Initial Pressure of System)/(Final Pressure of System-Initial Pressure of System). Stagnation Pressure of System is the total pressure of the air refrigeration system, including the static and dynamic pressure of the air at a given point, Initial Pressure of System is the pressure of the refrigerant at the starting point of the air refrigeration system, which affects the overall performance & Final Pressure of System is the ultimate pressure of the air refrigeration system after the refrigeration process is complete.

How to calculate Ram Efficiency?

Ram Efficiency formula is defined as the ratio of the difference between the power output of the refrigerant at the evaporator outlet and the power input to the compressor, to the difference between the power input to the compressor and the power input to the compressor at zero load is calculated using Ram Efficiency = (Stagnation Pressure of System-Initial Pressure of System)/(Final Pressure of System-Initial Pressure of System). To calculate Ram Efficiency, you need Stagnation Pressure of System (p₂'), Initial Pressure of System (P_i) & Final Pressure of System (P_f). With our tool, you need to enter the respective value for Stagnation Pressure of System, Initial Pressure of System & Final Pressure of System and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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