Capturable Rate is something that is new to our Compressed Air report.
The Caputurable Rate is simply the percentage of the electricity you can save that it took to generate the air that you are leaking.
Here is an example:
Let’s say you have a reciprocating compressor. It unloads and loads when you need it. But, when the compressor unloads it still draws electricity, let’s say it’s 60%, therefore you can only save 40% of electrical cost even when you “fixed” 100% of the air leaks.
Or stated another way, you have a 40db leak on a 100 psi system; the estimated leak would be about 2.5 cfm. At 12 cents per kilowatt, the air is costing about 39 cents per 1000 cfm to produce, making the amount of electricity used to produce the air for this leak 4241 Kw/H or $508.96. If you fixed this leak, the compressor would remain unloaded longer but, would still draw 60% of the electricity; you could capture 40% or $203.58 of the electricity.
Most compressor systems today will be designed with main air supplies that run @ 100% of the compressors ability. This will likely be a high efficiency compressor with a good plan for storage. Then they will add a trim compressor to the system to add more air for the extra demand. Generally it will not generate air as efficiently as the main compressor, but it will likely have the ability to completely shut off when the demand for extra air is not needed. In this example, you would be able to save 100% of the electricity used to compress the air making the capturable rate 100%.
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