This research aims to find the right size of the biomass pellet stove. A test by boiling water (Water boiling test), analyzing the effect of the size and height of the furnace, biomass briquettes on the efficiency and rate of combustion of the fuel stoves, biomass briquettes to find the right size. and is the most rewarding way to calculate the net present value (Net Present Value: NPV) and internal rate of return of the project (Internal Rate of Return: IRR) In this paper, the size of the furnace Biomass Briquettes study. is 3 inches, 4.5 inches and 6 inches, with a height of furnace of 30 cm 45 cm and 60 cm, respectively, and increased the height of the stove, 20 cm and 40 cm, respectively, showed that the Biomass Stoves 3-inch. height 30 cm, with the rate of fuel consumption average of 57.17 (± 6.07) mg / s effective mean of 24.26 (± 3.5)% Cost of stoves, biomass briquettes equivalent to 457 baht Biomass Stoves 4.5 inch height 45. cm, a rate of fuel combustion is estimated at 108 (± 5.57) mg / s effective mean of 26.48 (± 7.72)% Cost of stoves, biomass briquettes equivalent to 578 baht Biomass Stoves, 6-inch height 60 cm rates. Average fuel burn is equivalent to 212.33 (± 9.07) mg / s effective mean of 17.52 (± 5.81)% Cost of stoves, biomass briquettes equal to 791 baht.
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