Proposed Revisions of Part of the Test Procedures for Furnaces and Boilers in ASHRAE Standard 103-1993.
Proposed Revisions of Part of the Test Procedures for
Furnaces and Boilers in ASHRAE Standard 103-1993.
Liu, S. T.
NISTIR 6913; 28 p. September 2002.
Available from:: National Technical Information Service
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furnaces; boilers; annual energy consumption; annual
fuel utilization efficiency; ASHRAE standard 103-1993;
burner operating hours; DOE test procedure; integral
functions for off-period losses; step-modulating
furnaces/boilers; two-stage furnaces/boilers
The U.S. Department of Energy's (DOE) procedure for
testing the Annual Fuel Utilization Efficiency (AFUE) of
residential central furnaces and boilers references
ASHRAE Standard 103-1993. The standard has been used by
the furnace/boiler industry to obtain the AFUE values of
their products as required by DOE. ASHRAE Standard
Project Committee (SPC) 103R is in the process of making
revisions to the standard to address some shortcomings
and to improve the calculation procedure on the basis of
comments and experiences from the industry. This report
presents proposed revisions to certain part of the test
procedure to address some of the comments. The proposed
revisions include a new procedure to calculate the
average burner on/off times of modulating
furnaces/boilers during the cyclic operation of the
burner, a revised method for the calculation of the
annual burner operating hours, and an extension of the
procedure to calculate the off-period flue loss of
oil-fired equipment designed with a long post purge
time. This report also provides the background
information on the derivation of the integral functions
listed in Appendix E of ASHRAE Standard 103-1993 that
have not been formally documented. Those integral
functions were used for producing the graphs in the
standard for the hand calculation of the off-period
losses with a calculator, and also in the numerical
algorithm in the computerized calculation procedure.