Watery Start To Period

Much has been spoken of specific fuel consumption engines especially those related to electricity generation for continuous use. The tests are comparable, of course, the use of emergency but the economic results are very different. Let's start

to take an excellent laboratory test taken from the pages of Giacosa, Motori Endotermici, something like the Bible of the specialists. While we recognize that it is not common representation of parameters as is the chart posted, also we have said repeatedly that it is almost impossible to get producers engine testing beyond the limits of maximum power. The curves are made always open throttle and get the other curves for different loading rate of 100% is almost impossible. Using

based on data Giacossa curves represented by the graph, change the parameters representation and carry fuel consumption and specific consumption as the dependent variable on the ordinate, abscissa power and speed test as a parameter, taking 1500 and 3000 rpm.

The result is the chart below, with language more understandable and accessible to those who are not so used and experienced. but as rigorous as the data that gave rise to the former.

We see that consumption at idle to 3000 rpm and 1500 rpm are 4.05 and 1.8 kg per hour necessary to maintain the mechanisms in motion, without generating absolutely no electricity. To the extent that we charge the group will produce an additional consumption proportional to that burden, in both cases represented by the line of the cross-ordinate with the expenses in a vacuum. Now take each item and divide the kg consumed by the power, representing the specific consumption. Example To 10 HP and 3000 rpm 5.6 kg / hour divided by 10 gives a specific consumption of 560 gr / HP, compared to 250 gr / HP corresponding to the maximum engine power, 2.24 times more consumption the touted by the manufacturer. What is the significance of this analysis? Just that our engine of 58 HP maximum power consumes 2.24 times more if we use it to generate electricity by feeding a load of 10 Hp. With the same reasoning, we arrive to the conclusion that if we use the group to see TV only, we are consuming 162 times more fuel if the official group at 3000 rpm and 74 times more if the alternator out of 1500. While extreme cases, our experience indicates that

also quite true that very often come across situations like the one described

Oversize a generator means more investment costs , but operating costs and more expenses.

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Mr. Enrique O. Nielsen

www.windywest.com.ar

windywest@ssdnet.com.ar