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Participant

Join Date: Jun 2009
Posts: 4

Horsepower Calculation

06/03/2009 7:15 AM

HI FELLOWS

I AM WORKING AS TEST CELL ENGINEER IN PAKISTAN. WHERE I TEST THE CENTAUR TWO SHAFT GAS ENGINE MODEL T-4502, 4702,4002 AFTER OVERHAULING.

IN TEST CELL THE POWER TURBINE DIRECTLY COUPLE WITH DYNO.

LOAD CELL IS USED TO DETERMINE THE FORCE. I CALCULATE THE HP AS

HP=N*ARM LENGTH*FORCE/5252.1 WHICH SEEMS OK.

BUT I WANT TO CALCULATE CORRECTED HP AND SHP OF THE ENGINE?

I CALCULATE BUT THERE IS BIG DIFFRENCE COMPARE WITH DATA PROCESSOR FROM SOLAR TURBINES.

FOR EXAMPLE:

HP=14407*717*1.75/5252.1=3442

BUT THE HP SHOWS 3477.7 AND AFTER CORRECTION IS 3609.1 ON DATA PROCESSOR.

WHAT IS THE PROPER PROCEDURE FOR CALCULATE THIS?

HELP NEEDED THANKS

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Power-User

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#1

Re: HORSE POWER CALCULATION

06/03/2009 7:19 AM

Oi! JAVABOY! Keep the poxy noise down! Some of are trying to sleep! <Cough, wheeze>

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Guru
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#2
In reply to #1

Re: HORSE POWER CALCULATION

06/03/2009 8:47 AM

Translation:

Using all CAPS is the 'net equivalent of shouting. Please don't.

End translation.

Try looking up the problem in a text book or on the web. There are lots of very good teaching sites out there. Good luck.

Alternatively, contact Solar and ask them how they programmed their box of tricks.

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Guru
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#3

Re: Horsepower Calculation

06/03/2009 8:02 PM

Hey there. I also live from testing engines down here. As you should already be aware, the power calculation is quite simple. You have a dyno with load cell, you know the distance from the load cell to the center of the shaft, so you multiply the load cell indication by the distance and you have your torque. Then, you multiply torque by speed and you have power. (because power is work over time, so, angular displacement times torque over time, so...) Just keep in mind to use units that agree to each other. I always like to use SI and then convert everything at the end because I don't like to use that conversion constants as the formula you posted. force in N, torque in N*m, speed in rad/s However: you again should be already been aware - Remember that the corrected engine shaft horsepower for standard day condition has nothing to do with your dyno calculation. This is acomplished by a correction given by your engine manufacturer, based on the specs they had during engine design at standard conditions such as sea level, 25 degC, ... this makes a huge difference, and may be the cause for your readings. Good test cells (oh, ok, at least my ones have this feature) incorporate both indications: to check if load indications are ok, and to check if your engine meets the spec limits from manual. This also occurs when you have specs for air bleed load.

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Anonymous Poster
#4
In reply to #3

Re: Horsepower Calculation

06/04/2009 12:15 AM

Last post is on the right track.

Most Solar machines come out as 59 deg F match, but you may have a higher one.

Your ambient is what? 100 deg F?

You need to contact your local office, probably Dubai.

Or email support @ solarturbines.com

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Participant

Join Date: Jun 2009
Posts: 4
#7
In reply to #4

Re: Horsepower Calculation

06/04/2009 5:53 AM

HI

OUR AMBIENT IS AROUND ABOUT 90 TO 105 DEGREE F

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Participant

Join Date: Jun 2009
Posts: 4
#5
In reply to #3

Re: Horsepower Calculation

06/04/2009 12:18 AM

HI FRIEND;

THANKS FOR REPLY AND PLEASED THAT WE R BOTH WORKING IN A SAME FIELD.

U TALK ABOUT UNITS AND CONVERSIONS. I USE TORQUE IN POUNDS,LENGTH IN FEET

AND POWER TURBINE RPM IS IN r.p.m

what about the matter now?

u also indicate the standard conditions we use 60 degree F AND 14.696 PSI FOR CORRECTED THE PARAMETERS. PLEASE GUIDE ME?

I WANT TO ASK HOW HUMIDITY FACTOR USE TO CORRECTED THE OTHER ENGINE PARAMETERS LIKE GAS PRODUCER SPEED OR TEMPRATURE CORRECTIONS etc?

thanking u i will remain

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Guru
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#6
In reply to #5

Re: Horsepower Calculation

06/04/2009 12:51 AM

As asked previously, please switch your capital letter key off. The excessive and repeated use of capitals is considered shouting and most rude.

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Anonymous Poster (1); bhrescobar (1); English Rose (1); JAVABOY (2); standarded (1); Stinky Pete (1)

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