Gas Furnace Guideline

CHAPTER 1: PREFACE

CHAPTER 2: DESCRIPTION 3
A. Heating Efficiency  3
B. Furnace Types 3
Natural Draft Furnace  4
Fan-Assisted Combustion Furnace  4
Direct Vent Furnace 4
Condensing Furnace 4
Pulse Combustion Furnace  5
C. Furnace Venting 5
Venting Categories 5
Automatic Vent Dampers  6
D. Limitations 6

CHAPTER 3: HISTORY AND STATUS 7
A. Efficiency Ratings 7
B. Energy Efficiency Standards 7
C. Other Standards  8
D. Condensing Furnace Manufacturers  8
Bryant  8
Heil  8
Lennox 8
Thermopride  8
Trane 8

CHAPTER 4: ANALYSIS 9
A. Overview  9
B. Energy Savings  9
C. Cost Effectiveness  10

CHAPTER 5: DESIGN ANALYSIS GRAPHS  11
A. Using the Furnace Graphs 11
Annual Energy Cost Savings Graphs 11
Normalized Energy Cost Graphs  11
Cost Effectiveness Graphs  12
B. Energy Cost Savings Graphs  13
90% Efficient, Condensing Furnaces 13
C. Cost Effectiveness Graphs  20
90% Efficient, Condensing Furnaces 20
CHAPTER 6: BIBLIOGRAPHY  29
CHAPTER 7: APPENDIX  31
A. Building Type Descriptions  31
B. Summary of Utility Rates  33
C. Scalar Ratio and SIR 34
Scalar Ratios Simplified 34
Selecting a Scalar Ratio 35
Savings to Investment Ratios (SIRs) 35
Advanced Economic Analysis  36

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