Abstract
In an effort to fully automate the operation of a small wood fueled greenhouse heating system, a novel fuel storage device was developed. The storage bin incorporates a top unloading, flexible, variable volume sling, and eliminates fuel bridging associated with gravity feed of the fuel into the metering auger of the furnace. The automatic control system for the storage bin was integrated with the furnace control to provide unattended operation. The storage system was evaluated by coupling it to the small (50 kW or 170,000 Btu/h output) wood fueled furnace intended to provide heat to a greenhouse. Performance tests conducted revealed satisfactory automatic control of both the furnace and the fuel delivery system. The storage bin appears to have various materials handling applications where bridging of particulate materials is to be avoided. General scaling relationships for the variable volume sling were developed, although the physical size limitations have not yet been tested experimentally.
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