（J. of the Society of Agricultural Structures, Japan, 38(3),167-174, 2007）

Studies on Effective Utilization of the Exhaust Heat in Kiln to Greenhouses (Part2)

- Proposition and Evaluation of Reusable Heat in Carbonization to Greenhouses throughout the Year ?

Shintaroh OHASHI, Kazuhiro NAKANO, Sadao SATOU and Tadao NAKAYA

Summary

The cultivation system that is able to use local energy through the year was proposed. The energy demanded of greenhouses and the energy supplied from carbonization was compared, and the effect of the system was evaluated from the viewpoint of thermal energy. The results are as follows:

(1) To use available heat efficiently for warming greenhouses, the amount of circulating warm water is about 4,000 L per hour for TDC (Two Days Carbonization) and about 6,500 L per hour for ODC　(One Day Carbonization), respectively.

(2) During the winter experiment, using warm water heated by the exhaust heat of kilns to heat greenhouses (assume temperature in greenhouse is 20℃), average ratio of alternate heating load is 38.8％ from that of TDC, and is 61.6％ from that of ODC, respectively.

(3) For cooling greenhouses, to use available heat more efficiently, the volume of water tank should be as big as possible.

(4) To use available heat efficiently for cooling greenhouses, the amount of circulating cold water is about 3,000 L per hour for TDC and about 4,500 L per hour for ODC, respectively.

(5) During the summer experiment, using cold water made by absorption chiller to cool greenhouses (assume temperature in greenhouse is 14℃ during  the night), average ratio of alternate cooling load is 86.1％ from that of TDC and is almost 96.9％ from that of ODC, respectively.

From the results above, it can be considered that the cultivation　system using local energy at all the year round proposed by this study can contribute to decrease oil expenditure and cultivation cost. And moreover, the system can be considered as a useful cultivation system in the snowy and cold areas because the creation of a new cultivation environment can be expected.



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