This rcpnrt was prepared 3s an account of work spurlsnrerl by the United States Government. Neither the United States nor the United States Energy Research and Development Administration, nor any of their employees, nor any ~f heir cnntractnrs, subcut~u.actors, or their employees, makes any warranty, express or implied, or assumes any legal liability nr r~spnnrih;lit>r f~r the accuracy, r.niioltle l r~~c s s ul. urel\llnoao of any information, apparatus, product or process disclosed, or represents that its use would not infringe privately owned rights. .
A direct measurement procedure has provided accurate eval-' , uation of the efficiency of residential heating units during full-load and part-load operation. Laboratory measured efficiency data for each heating unit are translated into a more useful form as annual fuel consumption and fuel-weighted seasonal efficiency values. The changes in fuel use and seasonal efficiency are evaluated for variations in operating conditions including: geographic location, design heat load of the building, domestic hot water use, and design fuel firing rate. The cornbi-. nation of direct, accurate efficiency measurement and calculation of annual fuel use provide a standard method for comparison of individual heating units and retrofit modifications on a common and realistic basis. The cost effectiveness and payback periods of equipment modifications can be quantitatively evaluated.
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