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ACKNOWLEDGMENT TABLE OF CONTENTS NOMENCLATURE I . INTRODUCTION 2. ON/OFF TIMES FOR MODULATING FURNACEBOILER 2.1 Background 2.2 AFUE Calculated by Current Test Procedure 2.3 Review of Current Procedure for Single Stage FurnacesBoilers 2.4 Proposed Procedure for Modulating FurnacesBoilers 2.5 Examples of AFUE Calculared on the Basis of Proposed Procedure 3. ANNUAL BURNER OPERATING HOURS AND ANNUAL ENERGY CONSUMPTION OF MODULATING FURNACES AND BOILERS 3.1 Background 3.2 Review of Test Procedure for Single Stage FurnacesBoilers 3.3 Proposed Procedure for Modulating FurnacesBoilers 3.3.1 Annual Burner Operating Hours 3.3.2 Annual Fuel Energy Consumption 3.3.3 Annual Auxiliary Electrical Energy Consumption 3.3.4 Units with Standing Pilot Light 1. CALCULATION OF OFF-PERIOD LOSSES FOR OIL-FIRED BOILERS WITH LONG POST PURGE TIME 4.1 Background 4.2 Calculation Procedure for Losses during Post Purge Period 4.2.1 Assumptions 4.2.2 Calculation for Sensible Loss 4.2.3 Calculation for Infiltration Loss 5 . INFORMATION ON THE DERIVATION OF THE INTEGRAL FUNCTIONS 5.1 Background 5.2 Derivation of the Integral Functions FOR CALCULATING THE OFF-PERIOD LOSSES IN ASHRAE 103-1993 0. SUMMARY . . . 111 iv

Proposed revisions of part of the test procedures for furnace and boilers in ASHRAE standard 103-1993