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Research paper : A rationalization guideline for the utilization of energy and resources considering total manufacturing processes (H. Kita et al.)−208 Synthesiology - English edition Vol.1 No.3 (2009) (54)−Question & comment (Norimitsu Murayama)Total exergy input indicates how distant it is from stable condition in nature, and it can be considered scientific expression of cost. The paper discusses the durability of ceramics components, but wouldn’t the value of total exergy input/durable years be index that expresses the performance of entire manufacture process?Answer (Hideki Kita)I think the value of total exergy input/durable years is one of indices that express performance. On the other hand, considering environmental load, durable year (durability) itself is important guide. For example if the values of total exergy input/durable years are same, disposed amount of product with longer durability become less.4 Future direction of evaluation method using exergyQuestion & comment (Koichi Mizuno)Based on the present comparison between the two kinds of heater tubes made from ceramics and iron (steel??), do you consider future research directions? There are two ways. One is to widen out to operations other than heater tube (horizontal spread), on which the Reviewer do not have advice. Another is deeper consideration of heater tube (vertical consideration). For example, to increase exergy efficiency further, technology to increase efficiency by recycling iron, or iron alloy technology to prevent dissolving in molten aluminum can be considered. Additionally, in ceramics, energy conservation may be considered in granulation and sintering operations that consume large energy in the manufacture process. For latter, “soft solution process” has been developed for manufacturing ceramics to avoid high-temperature sintering.Answer (Hideki Kita)Considering your comment, in Section 3.5, we showed guideline for rationalization of cases where ceramics or iron members were used, assuming current system, and then we summarized the current status and the direction of rationalization of casting system. 5 Future prospect is a mere summary.For direction, we added guideline of rationalization of iron and ceramics in Section 3.5. Particularly for ceramics, we described the technological prospects for further energy conservation of granulation and sintering processes that consumes high amount of energy in the manufacturing process, along with Figure 11. Although soft solution process is an effective method for small, lightweight members or thin film, it is not process appropriate for large silicon nitride sintering compact addressed in this paper. Therefore we did not include it in our consideration.

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