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A biomass boiler was tested for its suitability of providing supplement heat to a solar energy greenhouse. The greenhouse, located in southern Manitoba, measured 7 m wide and 30 m long and had an insulated concrete wall on the north side and double layer poly on the south side. The biomass boiler was rated 25 kW (85,000 Btu/h) for wood pellets and corn. Three biomass fuels (oat hull pellets, wood pellets, and sunflower hulls) were used in the boiler. Thermal energy was delivered from the boiler to the greenhouse through a hydronic system. Thermocouples were used to measure the greenhouse temperature and water temperature in the hydronic system. It was concluded that the biomass boiler was sufficient in providing supplemental heat to the solar energy greenhouse in February and March in southern Manitoba. The biomass consumption rate for oat hull pellets with a calorific value of 17 MJ/kg was determined to be 303 g/d-m2 in February and 130 g/d-m2 in March. When the biomass consumption rate was normalized against the Heating Degree Days (HDD), the biomass consumption rates were 9 and 8 g/HDD-m2 for February and March, respectively.
greenhouse, biomass energy, hydronic heating
Q. Zhang and R. Boris. 2013. Biomass energy for supplemental heating in a solar energy greenhouse. CSBE/SCGAB 2011 Annual Conference, Inn at the Forks, Winnipeg, Mb. 10-13 July 2011
Building Systems Engineering
CSBE/SCGAB 2011 Annual Conference, Inn at the Forks, Winnipeg, Mb. 10-13 July 2011
Canadian Society for Bioengineering