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2006 Volume 31 Issue 111 Pages
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Article type: Cover
2006 Volume 31 Issue 111 Pages
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Article type: Appendix
2006 Volume 31 Issue 111 Pages
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Article type: Index
2006 Volume 31 Issue 111 Pages
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Article type: Appendix
2006 Volume 31 Issue 111 Pages
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Article type: Appendix
2006 Volume 31 Issue 111 Pages
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Article type: Appendix
2006 Volume 31 Issue 111 Pages
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Article type: Appendix
2006 Volume 31 Issue 111 Pages
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Article type: Appendix
2006 Volume 31 Issue 111 Pages
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Article type: Appendix
2006 Volume 31 Issue 111 Pages
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Susumu TAKAHASHI, Kouichi NAKAMURA, Akira YAMADA, Harumi MATSUZAKI, Sa ...
Article type: Article
2006 Volume 31 Issue 111 Pages
1-8
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We have been researching and developing the in-plant technology for LiBr concentration measurement in an absorption refrigerator with the absorbent of LiBr aqueous solution and the refrigerant of water. In this paper, the application of the capacitance & pH sensor method to the LiBr concentration measurement was experimentally studied using hygroscopic strong electrolyte i.e. LiBr aqueous solution. As a result, it was clarified that capacitance and pH could be respectively expressed as a approximate function of non-dimensional solubility of solute without regard to aqueous solution temperatures, and that the capacitance & pH sensor method was available in very low concentration range and the pH sensor method was available in high concentration range. Carry-over of LiBr to refrigerant can be detected by using high sensibility of the capacitance sensor method in very low concentration range. Therefore, it was clarified that as regards effect of anticorrosive addition on the method above, there was no one in a pH sensor method and was a very little one in a capacitance sensor method.
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Akio TANAKA, Hiromi KOMINE, Yoichi SEKI, Yoshihiko MIYAKE
Article type: Article
2006 Volume 31 Issue 111 Pages
9-17
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This paper proposes a method to create a high accurate energy-consumption model. A method of producing a highly accurate energy consumption model was examined. The resultant model calculates one home's monthly energy consumption of electric power, kerosene, and city gas. The models produced in this study are nonlinear-multiple-regression models. The comparison showed that our proposed model predicts more precisely than the ordinary linear-multiple-regression ones. Moreover, the nonlinear model clarified effective techniques for energy consumption research, such as those used for a data-mining tool and a simulation tool.
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Hiroyuki SHIRAIWA, Tsutomu HOSOKAWA
Article type: Article
2006 Volume 31 Issue 111 Pages
19-27
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In recent years there has been a demand for the development of highly efficient heat exchangers for the purpose of saving energy and resources. A heat pipe is a heat exchanging device which operates with no external power in a closed system and transports a large amount of heat with a very small temperature difference between the ends of the pipe. Therefore, heat pipes are extremely effective at solving energy and environmental problems. A thermosyphon is a gravity-assisted heat pipe which uses gravity to drive the working fluid from the condenser section to the evaporator section. Many thermosyphons are of the geostationary type, and they have been the subject of considerable research. In contrast, there seem to be no studies concerning accelerating thermosyphons. In this study, we have considered the two-phase closed thermosyphon under an acceleration field. We investigated the heat transfer characteristics of the thermosyphon with dropwise condensation in the condenser section, which was subjected to sinusoidal oscillation in a vertical direction. As a result, we found that the heat transfer of the thermosyphon was enhanced by oscillation.
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Aiko KOBAYASHI, Kimiko KOHRI
Article type: Article
2006 Volume 31 Issue 111 Pages
29-36
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In the previous paper, a simulation method of equipment load and thermal environment in spaces conditioned by air-handling units together with hydronic floor panels was presented. In this paper, the simulation model was improved in calculation of space humidity and calculation for PMV control. The characteristics of several basic types of cooling operation and the effects of factors such as set point temperature of primary-air, internal heat generation and building thermal performance were analyzed through simulations.
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Hideki KUBOTA, Satoshi NAKAJIMA
Article type: Article
2006 Volume 31 Issue 111 Pages
37-42
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Vertical air temperature gradient is one of the main causes of discomfort encountered in heated rooms. This paper introduces an equation for estimating the air temperature gradient in a room heated with convectors. The equation was obtained by applying the characteristics of plume rising above the convectors. The air temperature gradient is expressed as second power of effective height of plume from its source to the ceiling. We tested the equation by conducting a series of experiments on a small model room heated with a model convector, and a field survey. The equation has proven as a good estimation by comparing with the results obtained through experiments.
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Takao KATSURA, Katsunori NAGANO, Sayaka TAKEDA
Article type: Article
2006 Volume 31 Issue 111 Pages
43-51
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This paper constitutes Part 2 in the series of studies that aim at development of a design and performance prediction tool for the GSHP system. First, authors described the high-speed algorithm of calculation of the ground temperature response for heat extraction of the multiple ground heat exchangers. Next, a variation of ground temperature calculated by using this method was compared with the one calculated by using superposition of the theoretical equation. As the result, the method's preciseness was proved and the calculation time was about 1/135 compared to the method described this paper with theoretical solution. From these, it was shown that the method has performance required to use as a design tool. In final, if the ground heat exchangers often become short in such a case that foundation piles of the building are used as the ground heat exchangers, it is necessary to consider heat transfer from edge of the ground heat exchangers. Thus authors reviewed the modification coefficients in order to obtain average surface temperature of the ground heat exchangers influenced by the heat transfer. The temperature calculated with the modification coefficient was compared to one calculated without the modification coefficient.
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Masayuki OTSUKA, Kazuhiro SHIGETA, Yusuke MINAMI
Article type: Article
2006 Volume 31 Issue 111 Pages
53-63
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The study aims to discuss through experiments the drainage performance evaluation and design method of the header-type horizontal drainage pipe system for SI housing. The study focuses on sanitary sewage systems, the performance of which has not yet been analysed in depth, proposes a method to calculate at practical level the decrease of the average flow rate "qd" of each kind of sanitary fixture used within sanitary sewage systems, and examines the effectiveness of the calculation method in practical applications using real pipework. The study also goes on to examine and identify by experiments carrying performance using various kinds of waste materials and discuss the correlation between the experiment results and the decrease of the qd value.
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Hironobu UCHIYAMA, Yoshihiro MURAKAMI, Kazuhiro MARUO, Junichi KURATA
Article type: Article
2006 Volume 31 Issue 111 Pages
65-72
Published: June 05, 2006
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In a boiler having smaller thermal capacity, the amount of exhaust fume like NOx, CO, CO_2 should be decreased as soon as possible for the sake of reducing air-polluting substances. A premixed-combustion type boiler with a multi-port burner plate is promising for its reduction and thus has been used as a water heater for home and business use. But this type of boiler has a strong tendency of extremely loud noise and therefore it is necessary to propose a noise reduction method. In this paper, the proposed reduction method is based on synchronization of frequency, in which the frequency of oscillation noise that is close to the resonance frequency of combustion system can be shifted to that of external exciting signal. In experimental results, giving an appropriate exciting signal, the sound level of the total system can be lowered by about 30dB and it is found that the proposed noise reduction method is effective.
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Article type: Appendix
2006 Volume 31 Issue 111 Pages
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Article type: Appendix
2006 Volume 31 Issue 111 Pages
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Article type: Cover
2006 Volume 31 Issue 111 Pages
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