Assuming you have acquired your legal , here is how you execute a test:
Efficiency is then:
The newer PTC 4-2013 also:
Fuel and flue gas analysis is required. The latest draft code revisions recommended moving from Orsat analyzers to continuous analyzers for improved accuracy. Asme Ptc 4.1.pdf
According to the standard, boiler efficiency is defined as the , calculated as the ratio of output heat to input heat: Assuming you have acquired your legal , here