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Article type: Cover
Pages
Cover1-
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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Article type: Index
Pages
A1-A50
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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Tomoo INADA, Noriyoshi ICHIKAWA, Tamio NAKANO, Shizuka HORI
Article type: Article
Session ID: A-1
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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This report performed an experiment by the high-rise tower which assumed multifamily housing of 4 floors to make the conditions such as pressure or the quantity of water that city water could supply clear. As the factor that the water supply pressure of the appliance deteriorated than an experiment result, it became clear that the influence of the pressure loss by the plumbing of the house inside was big.
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Shizuka HORI, Noriyoshi ICHIKAWA, Tomoo INADA, Tamio NAKANO
Article type: Article
Session ID: A-2
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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This study aims to investigate a requirement for promoting the city-pressure water supply system. The street-pressure water supply system is effective in supply of clean water and energy conservation. However, we consider the fall in pressure. In this paper, it reports on the result of the survey on water usage of apartment housing with city-pressure water supply system. As a result, there are differences in the water supply quantity by measurement and the water supply quantity by general calculation type.
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Shunsuke KAIDO, Noriyoshi YOKOO, Tatsuo OKA
Article type: Article
Session ID: A-3
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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The object of this paper is to present effect of urban infrastructure load reduction by enhancing performance of water consumption in houses in 23 wards of Tokyo and in 47 cities across Japan. We calculate the economic effects of water-saving measure and energy consumption and CO2 emission due to managing urban infrastructure load. As result, enhancing performance of water consumption by means of water-saving device affects not only household water reducing consumption but also urban infrastructure load reduction and brings about positive economic effects.
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Shinji Kosaka
Article type: Article
Session ID: A-4
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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The water consumption in a building is decided by the use number of times of the plumbing fixtures. The water load calculation table based on person's act is proposed.
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Eri KATO, Yoshiharu ASANO, Hideki TAKAMURA
Article type: Article
Session ID: A-5
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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The rest rooms in Matsumoto junior high school attached to Shinshu University had been repaired, when the school buildings were earthquake retrofitted. New fixtures were fitted and the numbers of them were changed in each rest room. The use frequency and the occupation time of fixtures were investigated, and the questionnaire survey of the rest room space and facilities were practiced. There were no changes in the student request to the rest room before and after repair.
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Yuichi FURUTA, Masayuki OTSUKA, Hiroshi IDA, Ryoichi TSUKADA
Article type: Article
Session ID: A-6
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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Water-closet system equipped with uroflowmetry analyzer to measure out urine flow rate and volume was developed, to improve the medical treatment environment. This is an experimental study to evaluate the performance of the water-closet system, setting up in drainage stack and horizontal fixture branch piping system. As a result of examinations, allowable measurement accuracy with uroflowmetry and the reliability of system are confirmed quantitatively, under the pipe pressure fluctuations which is given by actual drainage load. The Water-closet system can be available for 2-pipe vertical drainage stacks equipped with loop-vent pipes, under the condition of permissible pipe pressure within ±100Pa.
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Akihiro NAGANO, Masayuki OOTSUKA, Keiko NOJI, Masanobu YUZAWA, Kouichi ...
Article type: Article
Session ID: A-7
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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A rain recycling system installed at a refurbished old laboratory was operated for 2.5 years. We evaluate the system validity and the volume of rain water storage tank is appropriately 0.023-0.057m3/m2 of collecting area. Water quality of recycling water was decreasing year by year.
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Kazutoshi SUZUKI, Masayuki OTSUKA
Article type: Article
Session ID: A-8
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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In supporting the prevention of global warming, highly energy efficient cold/hot water-saving equipment has been developed and it has been increasingly introduced in houses. Especially, when it comes to the hot-water supply equipment in Japan, which takes up 30[%] of total domestic energy consumption per household, cold/hot-water saving with single-lever faucets, which very much relies on how individuals use such faucets, is put to the test. Through both an experiment with participants and Actual house actual survey and questionnaire survey on the Web, the study discusses a method for controlling the operation of single-lever kitchen faucets so as to prevent the waste of hot water, a method for using such faucets and the awareness of residents, and from the results acquired from the experiment and survey, this paper proposes a method for using such faucets and the necessity of energy conservation to be considered in product development.
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Keiichi YANO, Takashi INOUE, Masayuki MAE, Ryo NAKAHAMA
Article type: Article
Session ID: A-9
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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In this research, measuring the consumption of the hot-water supply for a year on 171 houses, the hot-water supply was analyzed in detail. As a result, the annual average hot-water consumption per person in small family was larger than in big family. Examining how to use in detail, the amount of continual usage during a single action was accounted for about 80% by short-time use of hot water supply. Households of young persons had a trend to use large amount of hot water supply during a single action, especially in high flow rate.
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Ryo NAKAHAMA, Takashi INOUE, Masayuki MAE, Keiichi YANO
Article type: Article
Session ID: A-10
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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In this report, possibility of the hot water supply energy reduction was examined based on survey investigation and the questionnaire survey. As a result, it was shown that hot water consumption nearly 20% might be reduced by changing behavior patterns or using the saving appliance. In the next, as a result of rough estimate of the efficiency of hot water heater, it was shown that the efficiency was low in a senior citizen household. It was also shown that the efficiency was improved by reducing invalid short-time use of hot water supply.
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Atsushi TANAKA, Saburo MURAKAWA, Yasuo KOSHIKAWA, Hiroshi TAKATA
Article type: Article
Session ID: A-11
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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We carried out measurement about the consumption and the usage of hot and cold water of the guest rooms in a city hotel. The purpose of this study is to develop the calculation method for hot and cold water consumption in the guest rooms of city hotel by the Monte Carlo simulation technique based on the analysis of hot and cold water usage. In this paper, as part 2, we compared the two kinds of calculation results; the each using model and the room unit model and considered about the effectiveness of calculation by the room unit model.
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Akiko TAKAAZE, Saburo MURAKAWA, Hiroki KITAYAMA, Yasuhiro HAMADA, Mina ...
Article type: Article
Session ID: A-12
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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The authors carried out questionnaires in four seasons and conducted field measurements about the hot water usage and the performance for the CO_2 heat pump water heater in eight houses for over a year from February, 2007. Based on the results of questionnaires and measurements, the characteristics of hot water usage were analyzed in detail. In this paper, monthly and daily changes of hot water consumption in each house based on the annual measurements were shown and compared to the results of the last year, 2006.
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Kenichi SATOU, Saburo MURAKAWA, Hiroki KITAYAMA, Yasuhiro HAMADA, Mina ...
Article type: Article
Session ID: A-13
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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In our study, field measurement on the hot water consumption and the performance of CO2 heat pump system in residential houses was started from 2005. Some kinds of CO2 heat pump system were set up in every houses. The difference of the system operation, water temperature going in and out of heat pump unit and the other parameters, were presented in this paper based on the results in 2006 and 2007. The coefficient of performance of the system was discussed caused by the difference of the system control or the characteristics of hot water usage in houses.
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Hiroshi TAKATA, Saburo MURAKAWA, Hiroki KITAYAMA, Yasuhiro HAMADA, Min ...
Article type: Article
Session ID: A-14
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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The authors analyzed the performance of CO_2 heat pump water heaters in houses on the basis of the data which had measured in houses located at the regions of different climates in Japan. In these measurements, the mode of operation for CO_2 heat pump was set in automatic mode. However, the mode of operation has some appropriate modes for hot water usage or life-style of dwellers. In this paper, the measurements were carried out by changing the mode of operation on March 2008. Based on the measurement data, the effects on running conditions of heat pumps are analyzed. As for a problem of hot water shortage, the fluctuations of the volume of heat storage by a difference in mode of operation are shown.
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Kentaro NAGAHIRO, Yasuhiro HAMADA, Saburo MURAKAWA, Hiroki KITAYAMA, M ...
Article type: Article
Session ID: A-15
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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This paper describes the performance evaluation of domestic hot water supply systems using a storage tank. First, the modified M1 mode as a standard hot water usage mode was mentioned. Second, experiments on the hot water consumption and the performance of CO_2 heat pump water heaters were carried out under the three (or four) different temperature conditions in a temperature-controlled room. Operational results on hot water loads, HPCOP and SCOP were shown.
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Toshifumi KUBOTA, Yoshiharu ASANO, Hideki TAKAMURA
Article type: Article
Session ID: A-16
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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The authors analyzed the primary energy consumption and the mean of CO_2 emission in comparing the condensing type gas water heater with the CO_2 heat pump water heater in a cold district. The performance of each water heaters was investigated in the same home with changing them in turn. The mean of energy efficiency was 0.85 in the case of condensing type gas water heater, and it was 0.61 in the case of CO_2 heat pump water heater. The primary energy consumption of the gas water heater was less than the CO_2 heat pump water heater, and energy efficiency was higher.
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Takumi FUJITA, Hiroaki SASAKI
Article type: Article
Session ID: A-17
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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This Research is Concerning the Decrease of Heating Energy of the Super-insulated House in Cold Region. The Energy Consumption for Cooling of This House where the Heat Pump Cooling System was Use only 1.5 times Energy about Ordinary House. And the Eco-kyuto System was Able to be Work Efficiently in the Outside of Low Temperature in Summer Season.
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Chie KOBAYASHI, Masayuki OTSUKA, Kazutoshi SUZUKI, Shosen SUGIZAKI
Article type: Article
Session ID: A-18
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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High efficiency Condensing Type Gas Instantaneous Hot Water Heater are spreading for CO_2 reduction. However, the water heater is the conventional primary heat exchanger in addition to the use preheating secondary heat exchanger. As a result, high acidic caused by drains water at combustion. It is neutralized with the neutralization equipment, and it drain into drainpipe. Therefore, the problem is the amount of emergence and the water quality value of drainage.
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Asuka FUKUDA, Takao FUJIWARA, Toshihisa MATSUSHIMA, Yoshiaki Oshima, S ...
Article type: Article
Session ID: A-19
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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In the portable hot water supply, the additional pattern that realizes immediate supply function of hot water is applied to the part-loop piping system for hot and cold water supply in practical use previously. We make an attempt for an empirical validation a roach of the plumbing design that composed of temperature-drop and water head-loss from perspective of energy saving in the building equipment.
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Shinichro GOTO, Toshimasa MATSUSHIMA, Yoshiaki Oshima, Takao FUJIWARA, ...
Article type: Article
Session ID: A-20
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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In the continuing series, we studied necessary conditions that composed of temperature-drop and water head-loss for the plumbing design to provide the optimum circulating-flow. It examined the water head-loss regarding the relative comparison of measurements as the whole of the part-loop piping system and as the partial branch piping from perspective of energy saving in the building equipment.
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Hideaki HASHIMOTO, Choyu WATANABE
Article type: Article
Session ID: A-21
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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We investigated the behavior of pressure concerning airtight storage tanks with a downward hot-water supply system under various operating conditions and evaluated the effectiveness of pressure regulating valves against negative pressure which leads to compression buckling of the tanks. It is confirmed that the airtight storage tank is buckled under a limited operating condition without any pressure regulating valves and that vacuum breakers or a backpressure-regulating valve prevent the tank from buckling.
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Fumio KIMURA, Takahiro OGAWA, Ikuhiro YAMADA, Michiyosi TAO
Article type: Article
Session ID: B-1
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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For many parameters such as IPF, water level, heat storage tank shape, discharging injection temperature or water injection velocity, the discharging characteristics of the dynamic ice storage system are experimentally investigated by using a small-sized ice making device. Furthermore, we compared the discharging characteristic of the large-sized ice making device with the discharging characteristic of the smaller ice making device.
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Ikuhiro YAMADA, Takahiro OGAWA, Michiyoshi TAO, Fumio KIMURA
Article type: Article
Session ID: B-2
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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In this report, we proposed and evaluated the simple discharge model that be able to predict the outlet water temperature in the discharging mode of the dynamic-type ice storage system that melt ice by jet water from lower part of tank. By melting form of complicated ice layer it simplifies in cylindrical condition, the model was possible to estimate the average temperature of the outlet water with parameter of tank shape (area and depth of water), ice packing factor, inlet water temperature, inlet water volume, and inlet water velocity.
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Takahiro OGAWA, Fumio KIMURA, Ikuhiro YAMADA, Michiyosi TAO
Article type: Article
Session ID: B-3
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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It has already been understood that the hydraulic resistance of ice layer in the water tank rises in ice with an increase of IPF(Ice Packing Factor) by using a deep water tank in case of thermal storage and even high IPF is not good at thermal storage. This report represents the relation to the flow velocity of water that passed in the hydraulic resistance of ice layer and the water tank height was clarified. In addition, the coefficient of permeability was calculated from the hydraulic resistance of ice layer and compared it with the theory coefficient.
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Satoshi MIYAGI, Yoshiyuki KAMIYA
Article type: Article
Session ID: B-4
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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The authors reported the effectiveness of floor thermal storage system with air path and jellied thermal storage body above the slab in previous papers. In this study, mixture of phase change material to jellied water thermal storage body is proposed to increase heat capacity stored. Experiments of heating and cooling thermal storage body were conducted by changing mixing ratio of phase change material and the effectiveness of that was confirmed. In addition, temperature distributions of jellied water thermal storage body were calculated using heat generation model.
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Hisataka KITORA, Kazusa KOIKE, Noriko AOTAKE, Hideharu NIWA
Article type: Article
Session ID: B-5
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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In recent years, it has been recognized that environmental and energy management at an area level is very important. So, exact operation and management is also important to promote efficiency in the DHC-system. But actually, energy performance has not been verified. This paper outlines performance verification of the DHC, and estimates some improvements about the management and the replacement of the machines.
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Michinori KUBOTA, Kazunobu SAGARA, Toshio YAMANAKA, Hisashi KOTANI, Hi ...
Article type: Article
Session ID: B-6
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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An air-conditioning system with water thermal energy storage tank has some problems such as dead water zone which make it's performance degrade. The aim of this research is to detect the problems of such air-conditioning systems by using measured temperature in tanks and flow rate. This paper shows the detecting method of dead water zone which are main problem and the results of applying the detecting method for measured data.
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Nobuo NAKAHARA, Tomoya KAWAJI, Ryoichi KUDO
Article type: Article
Session ID: B-7
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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Optimization tools for thermal storage systems have been developed in Heat Pump and Thermal Storage Center of Japan since 2000. The tool consists of dynamic simulation programs for heating/cooling load and thermal storage tanks and static energy and economic simulation program. Present report shows an example calculation for a hospital energy system including co-generation and multiple heat source system.
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Ryoichi KUDO, Tomoya KAWAJI, Nobuo NAKAHARA
Article type: Article
Session ID: B-8
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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The effect of compatibility of variable frequency driven heat pumps applied to non-thermal storage system with thermal storage system has been discussed together with the effect of capacity ratio for the complex heat pump systems with electricity-driven heat pump and absorption heat pump. In this effect, The effectiveness of the program tool developed at the committee of HPTCJ was confirmed.
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Naoki MATSUSHITA, Hiromasa YAMAGUCHI, HISATAKA Kitora, Harunori YOSHID ...
Article type: Article
Session ID: B-9
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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Thermal storage systems used in a building HVAC system is considered to be an important technology for energy conservation in building sectors as well as for reduction of CO_2 gas emission coupling with the current global warming issues. It is reported, however, that the energy conservation is not achieved in the real field due to lack of proper operation of the system. In this study, optimal operation scheme developed in previous report was applied to thermal storage systems used in a real building. And the result of trial operation is shown. The expected error percentage (EEP) of the daily summed cooling load was 9.8%, which shows the cooling load prediction method is accuracy enough for practical use. System COP was improved about 13% by optimal operation.
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Hiromasa YAMAGUCHI, Makoto TANAKA, [in Japanese], Harunori YOSHIDA
Article type: Article
Session ID: B-10
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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Thermal storage systems used in a building HVAC system is considered to be an important technology for energy conservation in building sectors as well as for reduction of CO_2 gas emission coupling with the current global warming issues. It is reported, however, that the energy conservation is not achieved in the real field due to lack of proper operation of the system. In this study, optimal operation scheme developed in previous report was applied to thermal storage systems used in a real building. In this report, the construction method and the calculation accuracy of system simulation model of HVAC system are described. And the effect of optimal operation is estimated by simulation.
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Kenta MAMIYA, Takeshi IWATA, Hiroaki KITANO, Kazunobu SAGARA, Yukio IS ...
Article type: Article
Session ID: B-11
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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A disc-shaped inert is applied to temperature-stratified thermal storage tank. In this study, inflow characteristic of the disc-shaped inlet was examined by a model experiment. Four types of disc-shaped inlet were used in the experiment. As a result of the experiment, the inlet which was inserted stainless steel wool between disks had a highest efficiency among them. An experimental equation of the disk-shaped inlet was identified by using experimental results for the type of inlet. The calculated results of tank water temperature by using the experimental equation agree well with the experimental results.
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Youki NAGUMO, Tadahiko IBAMOTO, Masashi MOMOTA, Takumo MIYANAGA, Ayunu ...
Article type: Article
Session ID: B-12
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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We proposed newly system which has vertical ice storage tank. This proposal is to install a storage tank along the side of building. Generally, storage tanks are installed under the ground. With this building height storage tank, AHU or FCU can take cold energy from each floor height of the tank, also transportation energy would be reduced. This system is using convection of water accruing on separator that divided the tank. On this paper, we studied on influence shape of separator for system-design. Through this study, the effectiveness of separator was confirmed, a part from ideal shape.
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Yukihisa NAKAYAMA, Hiroyuki KOSE, Koshiro NAKAJIMA
Article type: Article
Session ID: B-13
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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In this paper, we performed heat storage and heat collection throughout long term with a heat storage system of the solar heat use in the shallow-layer soil of depth around 2m and examined heat storage between seasons and possibility of the heat utilization. Heat storage layer in this paper is to construct in the shallow-layer soil, and it is a possible system that installation cost of the heat storage layer is held, because to shorten excavation quantity and piping length is possible, and because again, the insulation structure is unnecessary using the small of thermal conductivity of the soil. It can be said that the formation of heat storage layer which stabilized the shallow-layer soil is possible, because there is the annual change of the soil temperature of the heat storage layer outside about 4℃.
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Masashi IMANO, Motoyasu KAMATA, Yuzo SAKAMOTO
Article type: Article
Session ID: B-14
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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In order to grasp water flow pattern in a hot water storage tank, we perform an experiment that visualize water flow in such tanks. Analysis of this visualization leads us to create a new model of turbulent thermal diffusivity for macroscopic simulation of thermal distribution in tanks. Our CFD analysis validates vertical profile of turbulent thermal diffusivity that this model assumes. As a result of tuning parameters in this model by means of CFD analysis and macroscopic simulation, We find that the simulation with the model predict thermal distribution much better than that without the model.
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Takumo MIYANAGA, Tadahiko IBAMOTO, Masashi MOMOTA, Makio AIKAWA
Article type: Article
Session ID: B-15
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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"Thermal transportation system using Ice & Water" had been studied for contribution to energy conservation. On previous paper, possibility of block ice transportation between storage tank to the other tank was shown. On this paper, we focused on communicating tube, and examined to clarify the transportation characteristic. Through examinations, it was shown that proper water level is need for block ice transportation.
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Kazuhiro NAKAZAWA, Masaki NAKAO, Hideharu NIWA, Koichi YOSHINARI, Hisa ...
Article type: Article
Session ID: B-16
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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The DHC system in the block 3 in Nakanoshima was planned to utilize thermal energy of river water. The performance is continuously evaluated after it began to operate in December 2004. This report outlines results of the performance evaluation on annual operation from 2005 to 2007 and of various analyses based on ratingpractice.
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Yoshitaka UNO, Reiko KUBARA, Yoshiyuki SHIMODA
Article type: Article
Session ID: B-17
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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District heating and cooling (DHC) is expected to be a promising energy-saving measure. However, DHC has a number of problems in relation to building-side system, for example decreases in the temperature difference between the supply and return water carrying cooling and heating energy. The main reason is that the DHC plant and air conditioning systems of buildings are separately operated. Thus, this study proposes a new energy service in which the operator of the DHC plant controls air conditioning systems at the same time. We revealed that energy conservation measures at the demand side would decreases energy consumption by 4% by using a simulation model.
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Yuta KOTAJIMA, Kenichi KIMURA, Katsujiro HIRAI, Yoshihiko TANAKA, Yuji ...
Article type: Article
Session ID: B-18
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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District Heating and Cooling System in East Ikebukuro began the heat supply of cold water and steam in 1978. The update construction named "Reconstruction" began in 2002, and it completed it at the end on March, 2008. This paper shows the summary of the project and Result of the Environmental Load Reduction.
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Toru ICHIKAWA, Yoshibumi SUGIHARA, Kenichiro WATANABE, Ryota KUZUKI, W ...
Article type: Article
Session ID: B-19
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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For an enhancement of a function and the applicability of SPREEM, S DHC is chosen by reason of high level machinery and biggest in Japan. Machinery performance, system performance and operational method are investigated. At first, construction and specification of the machinery of the DHC are shown. Cold and thermal supply and energy consumption of the machinery are shown. The analysis of operation of boiler, cogeneration and refrigerators are shown. And the analysis of the transportation power to send to consumers is shown. High accuracy and valuable data are taken out.
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Yoshibumi SUGIHARA, Toru ICHIKAWA, Kenichiro WATANABE, Ryota KUZUKI, W ...
Article type: Article
Session ID: B-20
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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For an accuracy testing and extensions of SPREEM, S DHC is chosen by reason of high level machinery. Machinery performance, system performance and operational method are investigated. And those characteristics are incorporated in SPREEM. With real data, a verification result of the energy performance is shown. The calculation results of the simulation agree with measured value on very good accuracy. Furthermore, solar water heater and the dehumidification air conditioner for renewable energy machinery are incorporated. Formula of easy dehumidification performance is shown. The equation is verified by some method. And it is proved that accuracy of the equation is very good.
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JIEWEN Zhang, YIWEN Wang, Shunsuke KAIDO, Noriyoshi YOKOO, Tatsuo OKA
Article type: Article
Session ID: B-21
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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The aim of this paper is to study on Area-wide energy utilization by use of self-supporting decentralized energy system in Utsunomiya city. We divide area around Utsunomiya station into 6 districts and draw up the following three scenarios of Area-wide energy utilization by use of self-supporting decentralized energy system in Utsunomiya city and estimate about energy consumption based on three scenarios. 1) Each district has CGS. 2) There is CGS across all districts. 3) In addition to the second scenario, waste heat was utilized.
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YIWEN Wang, JIEWEN Zhang, Shunsuke KAIDO, Noriyoshi YOKOO, Tatsuo OKA
Article type: Article
Session ID: B-22
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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The aim of this paper is to study on Area-wide energy utilization by use of self-supporting decentralized energy system in Utsunomiya city. We divide area around Utsunomiya station into 6 districts and draw up the following three scenarios of Area-wide energy utilization by use of self-supporting decentralized energy system in Utsunomiya city and estimate about energy consumption based on three scenarios. 1) Each district has CGS. 2) There is CGS across all districts. 3) In addition to the second scenario, waste heat was utilized.
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Ippei NAKAGAWA, Youichi TANAKA, Masaya OKUMIYA
Article type: Article
Session ID: B-23
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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This paper describes performance of energy saving when the energy interchange between plural multiple buildings. In this study, we consider the building with a cogeneration system and the building without a cogeneration system. This study discusses energy interchange (heat interchange and power interchange) for some cases described below. One case is only heat interchanged between two buildings. The other case combine heat interchange and power interchange. Finally, the reduction ratio of primary energy is 4.22%.
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Hideharu NIWA, Yoshiyuki SHIMODA, Hisataka KITORA
Article type: Article
Session ID: B-24
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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In this paper "Productivity on Energy" defined based on a general idea of "factor" is discussed. And some cases of estimation of an index for evaluation of "Productivity on Energy" are performed in a District Heating and Cooling area. Index changes according to variables such as site planning, performance of energy system, amenity of the interior and exterior, and activity of the area. From results of estimation it is shown that index is available for energy and environmental evaluation in urban block areas.
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Hiroyuki MISHIMA, Yasushi KONDO, Hajime YOSHINO, Hidetsugu SASAKI, Jin ...
Article type: Article
Session ID: C-1
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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In this paper, three types of the HVAC system and two types of the consideration of solar radiation method are compared under cooling condition in the open type office by CFD simulations. In case A, mixing ventilation with single-glass window and in case B, displacement ventilation with single-glass window was studied. In case C, the applicability of the D.V. perimeter-less system with displacement ventilation was examined. Furthermore, two cases of D.V. perimeter-less system which were installed a blind were compared under cooling condition by CFD simulations.
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Jinya TAKEUCHI, Hajime YOSHINO, Hidetsugu SASAKI, Yasushi KONDO
Article type: Article
Session ID: C-2
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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Displacement ventilation system(hereafter D.V.) can make indoor air quality better than conventional mixing ventilation(hereafter M.V.) does and can also save energy for HVAC. Generally, the required ventilation flow rate of D.V. is designed same as M.V. and supply air temperature of D.V. is higher than M.V.. When supply air temperature of D.V. is low, fan operating energy can be reduce, furthermore, duct size can be compact. However, when air diffusers designed for small under-temperatures supply low temperature, draught along the floor occurs in the occupied zone and thermal condition would become worse. In this paper, a full-scale experiment in a laboratory on D.V. was presented. The distribution of temperature was discussed with the experimental results. Several factors were investigated, i.e. discharged height of supply air and large under-temperatures, such as ambient air and low supply air temperature.
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Shin HAYAKAWA, Ayako HASEGAWA
Article type: Article
Session ID: C-3
Published: August 08, 2008
Released on J-STAGE: August 31, 2017
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The wall type displacement air conditioning has been adopted at the hall(13m×21.6m×7m(h)) of the university. As dehumidification of OA by cooling is indispensable in Japan, reheating it was also needed to avoid the draft problem. To save this reheating energy, the half of return air was mixed directly with the cooled outdoor air. Through the subject experiments supported by nearby 200 people in total, it was clarified there were few problem related to indoor air quality and thermal environment.
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