Vol.4 No.3 2012

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Research paper : Demonstration test of energy conservation of central air conditioning system at the Sapporo City Office Building (H. Takeuchi )−142−Synthesiology - English edition Vol.4 No.3 (2012) the efficacy of the technology was considered objective, provided practical information to offices that wished to quickly deploy energy-saving practices, and led to the increase in inquiries, and some places did actually install the technology. The nature of the inquiries was distinctly different from the usual ones that simply asked for the outline of the technology. Many of the inquirers presented the outline of the facilities in their buildings and asked about the cost, assuming actual installation.Table 3 shows the typical questions among the 150 inquiries to AIST after the press release, and the answers. In the inquiries, there were several questions about the flow drag reduction in low temperature, including the combined use with antifreeze and ice thermal storage. Feedback from basic research such as the development of a new agent for low temperature is necessary. There were also several inquiries about the cooling system for plants that handle foods and beverages, but in most cases installation was not done since there was a possibility of circulating water leakage that might contaminate the foods. There was an inquiry from a Japanese company that had plants in Southeast Asia for use in the cooling system, but this was not done due to the problem of local concentration management. 8 Future developmentUp to present, the consideration of installation to the building, the injection work, and the maintenance and inspection, as well as the manufacture and sales were done entirely by the company that developed the agent. In the future, we believe this technology will quickly diffuse if the building maintenance companies, building management companies, or design offices will conduct the preliminary check of the water quality and pipe system and the maintenance including agent injection and concentration management. From this perspective, it is probably effective to organize an annual technical experience seminar by expert lecturers to the engineers of maintenance companies.Although the application to the regional cooling/heating system will greatly promote energy conservation, there is no clear conclusion on the issue of heat transfer performance. This is an issue that must be solved quickly through demonstration tests by the experts of the elemental technologies that comprise the system. AcknowledgementsThe demonstration test was conducted according to the basic agreement between AIST and the City of Sapporo for the effective use of energy. The joint research contract was signed among: the General Affairs Division and Environment Division, City of Sapporo; Department of Mechanical Engineering, Faculty of Science and Technology, Tokyo University of Science; Shunan Regional Industry Promotion Center; and Fujiwara Environmental Sciences Institute Ltd. We are grateful to the people in charge at these organizations for their efforts. We are also thankful to the LSP Cooperative Union which provided us technical instruction for the use of the agent, and the people of Sapporo City Office and Kitaden Co., Ltd. who provided enthusiastic technical support for the execution of the test on site and the maintenance of the system, and continues to provide maintenance work. Table 3. Examples of inquiries to AIST and responsesThe effect can be seen even in small pumps. For example, the portable experiment apparatus used for the demonstration of Toms effect is a channel where the 18 m vinyl tube with inner diameter of 12 mm is coiled up into rings of diameter of about 30 cm, and about 30 % energy saving effect can be obtained. The pump is 150 W. The decrease of freezing point cannot be expected with 5000 ppm of this surfactant. It is necessary to check the flow drag reduction in the presence of antifreeze using the small experimental apparatus.We installed a heat exchanger in the attic 15 years ago, and get hot water from spring to autumn. Can the same effect be obtained for small pumps? Also, the heating medium has antifreeze to prevent freezing. Does the water containing surfactant have antifreeze function?Individual homeThe person in charge visited the Sapporo City Office, and we explained the principles and MSDS. We have not done basic experiment for the flow drag reduction using food additives.We want to save energy because we need large amount of energy for cold water circulation at our plant. Also, is there any surfactant that is approved as food additive and also has flow drag reduction effect?Major beverage companySince the cooling tower is open to the atmosphere, bubbling occurs at this section, and therefore the surfactant cannot be used.The person in charge of the facilities brought diagrams, and mentioned they wanted to do tests for the new government building that was being constructed.Local governmentSince the aging of the pipes has progressed, the rust inside the pipes may be a problem. The surfactant and the rust may bond, and may inhibit the effect.Can it be installed in the government buildings?Central government ministryAnswerQuestionInquirer

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