Technology for efficiency measurement of woodburning and other solid fuel appliances: Phase 2, Progress report, September 26, 1983-August 31, 1986

The purpose of the project is to determine the accuracy of several stack-loss efficiency measurement methods for solid fuel heaters. The methods include the Oregon method which has the force of law in Oregon, the WHA method developed under DOE sponsorship at Auburn University, the ASTM method (a more sophisticated version of the WHA method), and two ''direct loss'' methods. The direct loss methods are different from the other three methods in that chemical energy losses are determined by relatively direct measurements. During Phase II, stack-loss methods and room calorimetry (used as the ''reference'' method) were simultaneously used to measure the efficiencies of seven types of heaters. Preliminary findings on the accuracy of the stack-loss methods are given in this progress report.