Vol.3 No.3 2010

Research paper : An optimum design method utilizing a strategic system design concept (J. Fukuda et al.)−196−Synthesiology - English edition Vol.3 No.3 (2010) disposal, as in the use of the waste material from the manufacture of distilled spirits as fertilizer. However, it is said to be unrealistic to apply this concept to the reuse of waste heat from datacenters. This is because the efficient use of low-temperature waste heat has been discussed for a long time as an issue of efficient use of waste heat from power plants, and there have been many discussions assuming various physical and value systems, and we have not yet been able to propose any economically feasible applications. Yet, I think you are proposing a very unique and useful concept. I think it will be convincing if you present this thinking as an analysis of the case that has been realized. What do you think about this point?Answer (Jiro Fukuda)In the latest datacenters, there are places that use outdoor air-cooling, where the outside air is directly taken in to cool the server and the heat is released outside of the building, alongside cooling using the heat pump. I think it is possible to maintain the temperature necessary for greenhouse farming using waste heat from the datacenter. There are cases of successful greenhouse farming using waste heat in the Japanese datacenters as a physical system (IDC Frontier: Press release – The effect of outdoor air conditioning was confirmed in the demonstration experiment of Asian Frontier of the IDC Frontier; the reduction in power consumption of air conditioning was maximum 40 %; efficacy of use of waste heat in agriculture was also confirmed, 2010.3.29). Also, the calculations are done assuming that the waste heat during summer is unused, but the result shows that the reuse of energy in winter alone is sufficiently economically feasible. Even considering the environment tax that is expected to be imposed in the near future, I think it is one of the factors that lead to the increased value of waste heat use.In this paper, our goal is to establish both the physical and value (economic) feasibility that cannot be optimized by a single stakeholder, by taking the strategic viewpoints including those of different stakeholders such as the datacenter company and farmer, other than looking at the dual system of physical and value systems. From this perspective, we used the datacenter as a subject rather than the case of energy reuse within a plant by a company.Comment (Koh Naito)You propose a model for optimization from the mutual relationship of the system using the datacenter as a case study. I think it is better to clarify that the use of waste heat from a datacenter is a case study, and to emphasize the universal applicability of the idea proposed in this paper.Answer (Jiro Fukuda)The basic view of “strategic system design” can be expanded to other models of energy management by stakeholders with different objectives such as the smart grid, not just reuse of waste heat. We made the revisions to reflect this thought.


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