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Title: Improving Gas Furnace Performance: A Field and Laboratory Study at End of Life

In 2010, natural gas provided 54% of total residential space heating energy the U.S. on a source basis, or 3.5 Quadrillion Btu. Natural gas burned in furnaces accounted for 92% of that total, and boilers and other equipment made up the remainder. A better understanding of installed furnace performance is a key to energy savings for this significant energy usage. Natural gas furnace performance can be measured in many ways. The annual fuel utilization efficiency (AFUE) rating provides a fixed value under specified conditions, akin to the EPA miles per gallon rating for new vehicles. The AFUE rating is provided by the manufacturer to the consumer and is a way to choose between models tested on the same basis. This value is commonly used in energy modeling calculations. ASHRAE 103 is a consensus furnace testing standard developed by the engineering community. The procedure provided in the standard covers heat-up, cool down, condensate heat loss, and steady-state conditions and an imposed oversize factor. The procedure can be used to evaluate furnace performance with specified conditions or with some variation chosen by the tester. In this report the ASHRAE 103 test result will be referred to as Annualized Efficiency (AE) to avoidmore » confusion, and any non-standard test conditions will be noted. Aside from these two laboratory tests, steady state or flue loss efficiency can be measured in the field under many conditions; typically as found or tuned to the manufacturers recommended settings. In this report, AE and steady-state efficiency will be used as measures of furnace performance.« less
Authors:
 [1] ;  [1] ;  [1]
  1. Gas Technology Inst., Des Plaines, IL (United States)
Publication Date:
OSTI Identifier:
1172290
Report Number(s):
DOE/GO--102015-4624
KNDJ-0-40346-03
DOE Contract Number:
AC36-08GO28308
Resource Type:
Technical Report
Resource Relation:
Related Information: Work performed by Partnership for Advanced Residential Retrofit, Des Plaines, Illinois
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B)
Country of Publication:
United States
Language:
English
Subject:
03 NATURAL GAS; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; RESIDENTIAL BUILDINGS; FURNACES; NATURAL GAS; BUILDINGS RESIDENTIAL; RESIDENTIAL BUILDINGS; PARR; BUILDING AMERICA; PARTNERSHIP FOR ADVANCED RESIDENTIAL RETROFIT; FURNACE; NATURAL GAS; AFUE; ANNUAL FUEL UTILIZATION EFFICIENCY; ANNUALIZED EFFICIENCY; AE; Buildings