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 Post subject: Calculating overall efficiencyPosted: Thu, 29 May 2003 19:04:47 UTC
 S.O.S. Newbie

Joined: Wed, 28 May 2003 20:41:59 UTC
Posts: 1
Location: Kent
A specification sheet for a machine lists the following efficiencies:
AC Motor = 83%
Hydraulic Pump = 83%
Hydraulic Motor = 82%
Hose & Valves Losses = 80%
The overall efficiency is listed as 50.6%
It is my assumption that the overall efficiency be calculated as follows:
.83 * .83 * .82 * .8 = .45 or 45%
Am I wrong? or how does one arrive at 50.6% in the above example?

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 Post subject: Re: Calculating overall efficiencyPosted: Thu, 29 May 2003 19:37:38 UTC
 S.O.S. Oldtimer

Joined: Mon, 19 May 2003 07:15:29 UTC
Posts: 204
Location: Los Angeles
web wrote:
A specification sheet for a machine lists the following efficiencies:
AC Motor = 83%
Hydraulic Pump = 83%
Hydraulic Motor = 82%
Hose & Valves Losses = 80%
The overall efficiency is listed as 50.6%
It is my assumption that the overall efficiency be calculated as follows:
.83 * .83 * .82 * .8 = .45 or 45%
Am I wrong? or how does one arrive at 50.6% in the above example?

You need to average all that stuff:

Add to that the Hydraulic Pump is leaking oil at a rate of 20%,
this brings down our average to 51%

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