The field test and swirl tunnel update reports on the EPRI CEMS Heat Input/Heat Rate Discrepancy project are now available. These reports show conclusively that the primary cause of high heat input measurements by Part 75 CEMS is that EPA Reference Method 2 measures high in the presence of "swirling" stack flow. Other small causes for the high bias are also identified and quantified. Under carefully controlled conditions, heat rate closure between stack and conventional input/output measurements was achieved within 1.6% and 3.4% at the two sites. These reports are in HTML format and can be printed in B&W and color directly from your browser.
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