Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Compressors horsepower calculation

The expander equation (Equation 1) is generated from the standard compressor head calculation (see Compressors, Horsepower Calculation) by ... [Pg.129]

Compressor horsepower is best determined using the horsepower calculation in Chapter 6. For refrigeration compressors, the horsepower can he approximated another way that may prove to be simpler. The compressor horsepower per ton of refrigeration load depends upon the evaporator and eondenser temperatures. See the seetion titled Estimating Horsepower per Ton in Chapter 11. [Pg.225]

Most compressor manufacturers use the adiabatic horsepower calculation, Eq. (8.3), which is therefore recommended and applied here. [Pg.329]

Most large centrifugal refrigeration compressors are driven by steam turbines. A gradual loss in refrigeration duty can be due to a reduction in turbine horsepower. An approximate method for calculating small changes in compressor horsepower is ... [Pg.116]

Calculate the suction capacity, horsepower, discharge temperature, and piston speed for the following single-stage double acting compressor. [Pg.63]

Power requirements and discharge temperatures are calculated using the same relationships as used with the other rotary compressors already discussed. The efficiency is. 80 for air service and pressure in the 30 psig range. The mechanical losses are higher than the other rotaries. The mechanical loss is variable and dependent on gas, lubrication, and other factors. For an estimate, use. 15 of the gas horsepower. This approxuna tion should be close enough for an estimate. [Pg.128]

This horsepower is convenient to calculate when a known cylinder(s) exists on a compressor and when its performance is to be studied. [Pg.429]

Bill has asked you to calculate the new compression horsepower output from the compressor. Using Eq. (18.1), we note... [Pg.221]

I like to calculate the relative compression efficiency because I do not have to know the flow of process gas. I do not have to know the driver horsepower output, the steam to the turbine, the fuel gas to the gas turbine, or the speed of the compressor. I do not have to know Z (the gas compressibility factor) or K (the ratio of the specific heats). The things I do have to know—the suction and discharge temperature and pressure—I can check with my own hands and my own tools. [Pg.394]

Gas expanders are used to recover energy from high pressure process gas streams in a plant when the lower pressure is adequate for further processing. Power calculations are made in the same way as those for compressors. Usually several hundred horsepower must be involved for economic justification of an expander. In smaller plants, pressures are simply let down with throttling valves (Joule-Thomson) without attempt at recovery of energy. [Pg.65]

Use Eq. (24) in Chap. 14 of this text to calculate the theoretical compressor power. The brake horsepower efficiency of the electric motor... [Pg.862]

To calculate the size of an electric motor, divide the compressor shaft power by an electric-motor efficiency. Efficiencies for electric motors are given in Table 5.9. The size of electric motors are standardized according to horsepower, as shown in Table 5.10. If less than the standard horsepower is calculated, then the next standard horsepower is selected. [Pg.240]

The computer program PROG61 calculates the polytropic and adiabatic heads of a compressor. Table 6-5 shows the input data and results of the gas mixture. The gas discharge temperature is 310.4°F and the compressor polytropic head is 76874 ft with a total break horsepower = 960 hp. [Pg.449]

An electric motor is to be used to drive a compressor of 1,119 brake horsepower (BHp), The efficiency of the motor is 95%. Therefore, the electrical input to the motor must be l,119(0.7457)/0.95 = 878 kW. This is equivalent to 3,000,000 Btu/hr, which is the basis for the previous example. Calculate the kW-hr required per year for the motor if the plant-operating factor is 0.9, and calculate the cost of electricity per year. [Pg.569]

ILLUSTRATIVE EXAMPLE 15.9 Determine the hydraulic, brake and installed horsepower required to compress a reactor feed of5000 Ib/h of ethane vapor at 20 psia and 75°F, having a density of 0.105 Ib/ft, to 200 psia. Large compressors typically have efficiencies in the range of 75% to 85% employ a median value of 80% in the calculation. [Pg.390]

Enthalpv/Entropy Correlations. The most expensive item in a turboexpander plant is the compressor which is designed from enthalpy/ entropy calculations. For a fixed horsepower the results are almost the same for Property-75, Peng-Robinson, GPA K H Soave, GPA K H Lee, GPA K H Starling-Han BWR, and GPA-k method. The largest variation predicted is in the discharge temperature (maximum differences of 6.8° and 5.4°F) which would affect the discharge cooler sizes (assuming 120°F) by 3%. [Pg.307]

Brake horsepower required for a compressor is equal to gas horsepower plus mechanical loss. There are three methods to calculate the required horsepower. Each method is discussed in this section and can be used for any type of compressors. [Pg.62]

From the P-H diagram, Hs can be calculated directly followed the isentropic compression path. Once Hs is known, Eq. (3) can be used to calculate gas horsepower, and Eq. (4) can be used to calculate compressor discharge temperature. [Pg.63]


See other pages where Compressors horsepower calculation is mentioned: [Pg.696]    [Pg.220]    [Pg.315]    [Pg.50]    [Pg.251]    [Pg.46]    [Pg.124]    [Pg.174]    [Pg.409]    [Pg.271]    [Pg.697]    [Pg.264]    [Pg.244]    [Pg.177]    [Pg.466]    [Pg.672]    [Pg.495]    [Pg.570]   
See also in sourсe #XX -- [ Pg.112 , Pg.113 , Pg.114 , Pg.115 ]




SEARCH



Compressor calculation

Horsepower

Horsepower calculations

© 2024 chempedia.info