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  • Users: freefallingbody
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  1. freefallingbody

    GAS ENGINE DRIVEN INDUCTION GENERATOR

    Hi, For captive power plants, a typical system consist of engine and alternator. I wonder if I can use an Induction generator coupled to the engine with proper giverning systems to deliver the electrical power, instead of using the alternator. I hope this will not have the usual headaches of...
  2. freefallingbody

    Power factor correction

    Hi, This is a question related to improving power factor. I have a 22 kV supply from the electricity supply utility grid and five transformers ( 2 x 1000 kVA, 3 x 500 kVA) step teh voltage down to 433 Volts. The utility billing is based on a meter connected at the 22 kV line. The five...
  3. freefallingbody

    Energy in compressed air

    Dear all, While analysing the enegry efficiency performance of air compressor, I found difficult to understand the following: When air is compressed, say from atmosphere to 8 bar(g), the air temperature rises. After the first stage of compression, some heat is removed in the intercooler before...
  4. freefallingbody

    Steam turbine exhaust enthalpy determination

    Dears, The steam turbine + generator is designed for 6 MW power generation. Thsi is an extraction-condensing type turbine. Inlet steam pressure 44 bar, inlet steam flow is about 25 tons/hour. After first stage, pressure is 15 bar and temperature is 370 Deg.C. Condensing pressure is 0.06 bar...
  5. freefallingbody

    colebrooks equation

    Guys, This is peanuts for you folks here. Won't take much of your valuable time. Calculating pressure drops in pipeline, as I understand, needs first, an estimation of friction factor. I have referred to some books, and almost all of them gave me the following...
  6. freefallingbody

    MEASUREMENT & ESTIMATION OF PUMP FLOW

    Hi, I have a 25 mWC, 510 m3/h rated pump directly coupled with 60 HP, 1470 rpm motor pumping water in a cooling tower circuit. I wanted to measure the flow of this pump. I used a transit time type ultrasonic flow meter and got a flow of 520 m3/h. Since I don't trust these ultrasonic meters, I...
  7. freefallingbody

    No load, power factor meaurement

    Hi, I have tried measuring no load power of a 20 HP 4 pole motor. The p.f. indicated in the meter ( Power analyser- El Control , Italy make) was very low, 0.15 at no load. I wondered about the accuracy of this measurement. I referred to the calibration certificate of the meter and it gave me...
  8. freefallingbody

    condenser sizing rules of thumb

    Hi, For an ammonia based ice plant used in a dairy industry, is there any guidelines for condenser area ( sq. metre/TR )required? Please give me the likely sources of this information. Also regarding spray ponds give me some idea about the area/volume required per TR and flow per nozzle. Thanks
  9. freefallingbody

    Heat recovery from engine exhaust while testing

    My company manufactures ( and tests, ofcourse!) IC engines. While testing for a few hours, there is a possibility of heat recovery from flue gases at 400 C, which can be used for heating water. My question is: If a use a concentric heat exchanger to recover heat from flue gases to water, and a...
  10. freefallingbody

    Transformer Testing using IEEE C57.90

    Hi, A simplified method of conducting short circuit testing of 3 phase transformer is given in the above standard, by using a single phase source. On the H.V. side ( delta) apply small voltage between lines ( HR-HY) and keep all the L.V. side LR, LY & LB( Star) terminals short circuited. I...
  11. freefallingbody

    Stray losses in transformers

    Hi all, I am trying to estimate operating efficiency of a 50 Hz, 11kV/433V, 1000 kVA distribution transformer. I have measured no load losses, which I understand is essentially the core losses. Now, from the measured winding resistances on primary and secondary sides and the load current...
  12. freefallingbody

    Books on Drying

    Hi, Please guide me on this. I am looking for some books and best practices manuals in the field of Industrial drying. The pupose is to summarise the heat balance/ efficiency evaluation methods. Thanks in advance
  13. freefallingbody

    testing of dryers

    Hello, What are the standards/code of practice for testing dryers. I know.. I know... there are many types of dryers. Textiles/paper/powder dryers etc... Please give me details of the standards as much as you can. Please! Thanking you in advance
  14. freefallingbody

    Pump Specific speed and efficiency

    Hi, I am using PSAT software from US DOE. I want to know whether there is effciency penalty if specific speed is low as well as when it is high. I had seen a graph showing specific speed on x-axis , pump efficiency on y-axis and a number of curves ( almost similar to motor eff. curves) for...
  15. freefallingbody

    Testing FAD of air compressor

    hi, ASME PTC 9.0, BS 1571 etc. refer to testing air compressor by use of differential pressure measurements across a standard orifice, venturi or nozzle. A common method used at site conditions for testing reciprocating compressor is Pump Up Test 'by noting the time taken for rise in pressure...
  16. freefallingbody

    Temperature measurement of compressed air

    I am trying to estimate the temperature of compressed air at 7 bar g., stored in a receiver of 1 cubic metre volume. I have measured the surface temperature of the receiver by using a surface temperature probe and thermocouple. The probe was properly covered using insulation during the...

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