Investigation of Hot Air Paddy Drying by the Recirculating Batch Dryer Using Hot Water Created from the CO<sub>2</sub> Refrigerant Heat Pump Water Heater

NODA Takahiro, HIDAKA Yasuyuki, YOKOE Mio, MATSUDA Waichiro, WATANABE Daisuke

doi:10.11449/sasj.44.1_22

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Other Title

CO<sub>2</sub> 冷媒ヒートポンプ給湯器の温水を利用した循環式乾燥機による籾の熱風乾燥に関する研究
CO₂冷媒ヒートポンプ給湯器の温水を利用した循環式乾燥機による籾の熱風乾燥に関する研究
CO ₂ レイバイヒートポンプキュウトウキノオンスイオリヨウシタジュンカンシキカンソウキニヨルモミノネップウカンソウニカンスルケンキュウ

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Abstract

For the energy saving of grain drying by the recirculating batch dryer, we designed the grain drying system for 500 kg of recirculating batch dryer using heat pump. The main structure of this system is that the hot air for the grain dryer was generated by the CO₂ refrigerant heat pump water heater and the water-to-air heat exchanger. The chief characteristic of this system is that the system has a hot water storage tank, and the stored hot water acts as a heat-storage medium for grain drying. For the continuous grain drying even in a defrost period, we attempted to use the stored hot water and avoid the trouble due to the frequency of frost and defrost concerned in a low- temperature condition.For paddy drying, the drying speed was 1.0 %w.b./h, which is comparable to that of the conventional recirculating batch dryer using a kerosene burner. The increasing of cracking did not occur at a high level. The specific energy consumption was 2.6 MJ/kg-H₂O, and the CO₂ emission per 1 kg of moisture extraction was 3.1×10^-4 t-CO₂/kg-H₂O, which are 54 % and 23 % lower than that of an average recirculating batch dryer using a kerosene burner, respectively. The average of ambient temperature was 15.4 ℃ and COP of the heat pump unit was 3.2. Our results confirm that our system can maintain the conventional operating efficiency, and at the same time, it can cut energy consumption and contribute to reducing greenhouse gas emissions, providing the energy saving performance of the heat pump.

Journal

Nogyo Shisetsu (Journal of the Society of Agricultural Structures, Japan)

Nogyo Shisetsu (Journal of the Society of Agricultural Structures, Japan) 44 (1), 22-29, 2013

The Society of Agricultural Structures, Japan

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