Submitted By shishir18
Words 770
Pages 4
ME 416
Computer Assisted Design of Thermal Systems
Actual Compressor Calculations 1. Use guidelines for ideal gas turbomachinery to calculate ideal specific work and power. 2. Calculate volume flow rate in cubic feet per minute at the compressor inlet 3. Use the Brake Horsepower for a Generic Centrifugal Compressor graph to determine the basic brake horsepower. 4. Calculate the actual power by multiplying the basic brake horsepower by the ratio of the inlet pressure (in psig) to 14.5. This will give actual power in units of horsepower. You may wish to convert it to watts. 5. Calculate the actual specific work by dividing the actual power (in W) by the mass flow rate (in kg). 6. Calculate the actual adiabatic efficiency from ηs = w ideal w act or Wideal Wact

7. Determine the actual exit conditions by first calculating the actual exit enthalpy from h out,act = h in + w act

and then using property evaluation to determine the actual exit entropy and temperature. 8. Calculate any second law parameters (such as irreversibility or reversible work) that are needed.

1

ME 416 CAD of Thermal Systems

Figure 1. Brake Horsepower for a Generic Centrifugal Compressor
10000
8.0 6.0 4.0 Pressure Ratio 7.0 5.0 3.5 3.0 2.5 2.0 1.5

Basic Brake Horsepower (hp)

1000

100 1 10 100

Intake Volume Flow Rate (1000 CFM)

2

ME 416 CAD of Thermal Systems

Example 1: Single Stage Compressor Air at 105 kPa and 278 K enters a single stage compressor at 5 kg/s and receives a pressure boost of 250 kPa. Determine the power required, adiabatic efficiency, and exit temperature for a. Ideal Compressor b. Adiabatic Compressor with efficiency 79% c. Actual Generic Centrifugal Compressor It is useful to set up the following table to assist us. Inlet Conditions (State 1) T1=278 K P1=105 kPa Exit Conditions (State 2) T2,ideal=393.8 K T2,act=4244 K pt (b) =444 K pt (c)...

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