For using higher capacity which engine is preferable electrical? or diesel ?

Question

cost is not a matter. work efficiency is required give me comparitive statement.

Answer 1

Diesel can give you greater torque and capacity.

Diesel is also more efficient as there is a  the power plant that produced the electricity probably burned diesel or an equivalent with some loss in efficiency and then the use of the electricity would be an additional loss of efficiency.

Answer 2

I agree with the answer. "If electrical power is available, use electricity." I also agree with the advantages of electric motors listed.

However, I don't believe that there is a limitation on availability of electric motors above 2000 Hp or at any other power level for which diesel engines are available.

In Bath County, Virginia, there is a power generating station that pumps water up to a reservoir during the night and operates the pumps and motors as turbines and generators to generate electricity during the daytime. The motors each produce 563,400 horsepower (420 MW) .

http://www.dom.com/about/stations/hydro/...

NASA has a wind tunnel in their Langley Research Center that has a motor that is rated 135,000 horsepower (101 MW).

http://www.nasa.gov/centers/langley/news...

The electric motors that drive the propellers of the cruise ship Queen Elizabeth II are each rated at 59,000 horsepower (44 MW).

http://www.drives.co.uk/fullstory.asp?id...

Motor manufacturer web sites:

Siemens: induction motors up to 10,000 Hp (7.5 MW)

http://www2.sea.siemens.com/Products/Ele...

Siemens: synchronous motors up to 50 MW, 67,000 Hp

http://www.automation.siemens.com/ld/ac-...

TECO-Westinghouse: various types of motors up to 100,000 Hp (75 MW)

http://www.tecowestinghouse.com/PRODUCTS...

ABB: various types of motors up to 60 MW, 80,000 Hp (60 MW)

http://www.abb.com/product/us/9AAC100566...

General Electric: synchronous motors up to 100,000 Hp (75 MW)

http://www.geindustrial.com/cwc/Dispatch...

Toshiba: induction and synchronous motors up to 50,000 Hp (37 MW)

http://www.toshiba.com/ind/data/tag_file...

Answer 3

for higher capacity we can go for only Diesel Engines for its steablity ,durablity ,sturdy ,and dependable here we cant see any fluctuations with respect to voltage variations etc.

Answer 4

If electrical power is available, use electricity.

Electrical motors available up to about 2000 HP. They are easier to start and control, smaller and lighter, far less maintance, don't require handling fuel, don't use air (at least locally), higher reliability, lower cost, less temperature sensitive, less polluting (at least locally), smoother power output reduces impact on gear trains, less heat generation (i.e. less cooling required), less noise.

If they can be used, better and cheaper in every operational consideration I can think of.

For bigger engines, mobile power, or energy conversion from hydrocarbons, got to go with a diesel or a turbine type engine.

Answer 5

It depends on what you are doing.  Diesels have high torque at high RPM.  Electric motors have high torque at low RPM.  Do you need a source that accellerates a load quickly or do you need something that usually operates at speed?