Nihon Yoton Gakkaishi

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The exhaust gas of the enclosed vertical type composting facilities of 10m³ volume with a fermentation capacity of 10m³ has the quantity of heat of about 60MJ/h. We tried to recover heat of this exhaust with the plate fin type heat exchanger as heating source of water. As for the result, the water flow rate was 0.7-9l/min and temperature of the heated water was 44-34°C and the heat was used to heat the water up to 0.20MJ/min in summer, which water temperature is 29.2°C. The heat exchange efficiency converged upon approximately 90% under these conditions, and the overall heat transfer coefficient was 90W/m²·K. The water flow rate was 0.6-10l/min and temperature of the heated water was 58-29°C, and the heat was used to heat the water up to 0.55MJ/min in winter, which water temperature is 11.8°C. The heat exchange efficiency converged upon approximately 90% under these conditions, and the overall heat transfer coefficient was 95-98W/m²·K. When the exhaust temperature of the enclosed vertical type composting facility current varies periodically, the overall transfer coefficient also vary periodically.

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