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1 5
WOOD-FIRED AND PELLET-FIRED HYDRONIC SYSTEMS
ANSWERS TO TEXTBOOK QUESTIONS AND EXERCISES
1. During the 1900s, Americans moved away from using wood as their primary fuel when
5. A natural-draft wood fired boiler uses single stage combustion, whereas a wood
gasification boiler uses two-stage combustion.
10. The initial warming and drying of firewood is a prerequisite to further combustion. These
processes are called endothermic, because they absorb heat. The combustion reaction
12. Installing a heat exchanger between the piping circuit from an outdoor wood-fired
13. The static pressure is 7.1psia. According to Figure 15-29, boiling will not occur, although
15. An interior pellet storage container should be vented because outgassing of carbon
19. The piping carrying flow into the tank should be oriented horizontally to preserve
22. The high temperature volume is 1025 gallons. The low temperature volume is 145
gallons. The density of water at 50°F is 62.4 lb/ft3. The density of water at 105°F is 61.9
25. The battery can supply 84 watt-hours. When converted to AC power, this represents
