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Article type: Cover
Pages
Cover1-
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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Article type: Index
Pages
A1-A52
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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Takanori ITAI, Saburo MURAKAWA, Daisaku NISHINA, Akiko TAKAAZE
Article type: Article
Session ID: A-46
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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The elderly in the nursing home have a bath with care of the staffs. Although the number of these homes is increasing, the data of loads of hot water consumption on their bathing is insufficient for the design and the planning. Accordingly, the purpose of this study is to clarify the characteristics of the hot water consumption of bathing in the homes. In the bathrooms of the certain nursing home, the quantity and the temperature of hot water were measured through the year and the observation survey was carried out in each of three seasons. This paper shows the monthly consumption and the daily consumption for filling bathtubs, having a bath and cleaning of each bathtub.
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Akiko TAKAAZE, Saburo MURAKAWA, Daisaku NISHINA, Takanori ITAI
Article type: Article
Session ID: A-47
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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The purpose of this study is to clarify conditions of bathing with care and analyze the relationship between consumption and behavior. The measurements, the observation surveys and the questionnaire for the aged and the staffs were carried out in bathrooms of an actual nursing home which was chosen in the area east of Hiroshima. In this paper, the results of the questionnaire were examined. Each action in the bathing was defined based on the results of the observation. The time length and the amount of hot water of each action were clarified. Finally, the relationships among the former and the latter results were analyzed.
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Motoi YAMAHA, Miwako FUJITA, Takeshi HORIO
Article type: Article
Session ID: A-48
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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Design guide lines of hot water heaters for restaurants and retail shops have not been fully developed, nevertheless energy consumption of hot water take a large part of these buildings. A simple method to estimate hot water consumption from an exhaust gas temperature was proposed in the paper. Gas consumption was estimated from empirical equations from experiments and the status of operations was decided by patterns of exhaust gas temperature fluctuations. The accuracy of the method was verified to be sufficient for measurements on sites.
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Makoto SATO, Masayuki MAE, Kiyoshi FUKUZAWA, Motoyasu KAMATA, Shizuo I ...
Article type: Article
Session ID: A-49
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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In this report, to examine permissible width of the ambient temperature and the water supply temperature needed in standardizing it for the instantaneous gas water heater, the experiment that variously changed the ambient temperature and the water supply temperature was done. As a result, it was confirmed that the mode efficiency rose by rising of the ambient temperature. On the other hand, it became the result of the mode efficiency's rising by the water supply temperature low when limiting it to the latent heat collection type water heater. In addition, the reproducibility of the experiment was confirmed by measuring the same model with a different experimental apparatus.
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Kazutoshi SUZUKI, Masayuki OTSUKA, Takahiko SUZUKI
Article type: Article
Session ID: A-50
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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This study intends to grasp the consumption of cold and hot water and gas, which are wasted in a short time when cooking and washing-up using a single-lever kitchen faucet, and ultimately aims to examine the effectiveness of single-lever faucets which are initially developed to reduce such wasteful consumption. The first report concentrates on experimentation on washing-up activities using volunteers and the results of the basic experimentation are reported providing a fair idea of how often activities are performed as well as enabling the understanding of short-time usage of cold and hot water and gas, which possibly leads to wasteful consumption.
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Saburo MURAKAWA, Hiroki KITAYAMA, Minako NABESHIMA, Hiroshi TAKATA, Ya ...
Article type: Article
Session ID: A-51
Published: August 24, 2007
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, experimental conditions on the four types of CO_2 heat pump water heaters were mentioned. Second, experiments on the hot water consumption and the performance of CO_2 heat pump water heaters for one month were carried out based on the modified M1 mode as a standard hot water usage mode. Operational results on hot water loads, amounts of thermal storage in the tank, HPCOP and SCOP were shown.
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Masaya IHARA, Takeshi KONDO, Shizuo IWAMOTO, Takashi KURABUCHI, Masayu ...
Article type: Article
Session ID: A-52
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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In this study, a calculation model of heat pump unit in natural refrigerative heat pump hot water supply system is constructed from experimental data. Calculation results are compared with the experimental results and the consumption of electric power can be obtained within 5〜7 % error.
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Mari MIYATA, Katsuya MORIMOTO, Hirofumi IDA, Hajime AKAHANE, Hiroyuki ...
Article type: Article
Session ID: A-53
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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The data of domestic hot-water supply load, amount of used electricity, etc. was acquired for [of 36 real houses] one year about the CO2 refrigerant heat pump water heater, and the actual condition under real use has been grasped. This report describes the domestic hot-water supply load under actual condition in survey houses.
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Hajime AKAHANE, Hirofumi IDA, Katsuya MORIMOTO, Mari MIYATA, Hiroyuki ...
Article type: Article
Session ID: A-54
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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The data of domestic hot-water supply load, amount of used electricity, etc. was acquired for [of 36 real houses] one year about the CO2 refrigerant heat pump water heater, and the actual condition under real use has been grasped. This report describes the domestic hot-water supply load under actual condition and the analysis result of system coefficient in survey houses.
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Hiroki KITAYAMA, Saburo MURAKAWA, Yasuhiro HAMADA, Minako NABESHIMA, H ...
Article type: Article
Session ID: A-55
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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In recent years, energy efficient hot water supply system is installed in houses to save energy for hot water. However the system performance and its effect in actual condition depend on the hot water usage of each house. Therefore in our study, field survey on the hot water consumption and the performance of CO2 heat pump water heater was carried out in 14 residential houses of 7area in Japan. The survey consists of 2 parts, on-site measurement and questionnaires. Monthly and daily changes of hot water consumption in each house based on the annual measurements were shown in this paper. The characteristics of hot water usage in each house, the relation between a number of families and using hot water, the difference of lifestyle, were considered with the results of questionnaire.
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Naoki YAMAMOTO, Saburo MURAKAWA, Hiroki KITAYAMA, Yasuhiro HAMADA, Min ...
Article type: Article
Session ID: A-56
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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The authors carried out questionnaires and field measurements about the hot water usage and the performance for the CO_2 heat pump water heater in 14 houses for over a year. Based on the results of questionnaires and measurements through four seasons, the characteristics of hot water usage are analyzed in details. The behavior of taking bath has big influence on hot water consumption in houses. Therefore, the dweller's behavior at bathroom and the loads of hot water which are consumed by reheating the bathtub's water are studied And, we suggest the calculation models for the loads of hot water consumption in houses.
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Hiroshi TAKATA, Saburo MURAKAWA, Hiroki KITAYAMA, Yasuhiro HAMADA, Min ...
Article type: Article
Session ID: A-57
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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The field measurements of the loads of hot water demands and the performance for the CO_2 heat pump water heaters were carried out in 14 houses located at the regions of different climates for over a year. In this paper, based on the measurement data, the characteristics of running conditions for the CO_2 heat pumps are analyzed in details. The effect factors for the COP of heat pumps and systems are analyzed with the multiple regression analysis technique. As for the residual hot water in storage tank, which seems to influence the COP of systems, the relationship the required hot water temperatures and the volumes of thermal storage are shown.
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Ken-ichi KAMEDA, Shuzo MURAKAMI, Takamasa KANEKO, Kazuhide ITO, Hitosh ...
Article type: Article
Session ID: A-58
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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This paper (Part17) reports the effects of air quality and thermal environment on motivation and productivity for student. The psychology of subjects has the possibility of strongly influencing the learning performance. In this paper, the evaluation of "motivation for learning" is tried by using a questionnaire as self-assessment form. As an investigation result, the motivation for learning during the lecture influenced the quiz scores and linear relationship was observed between the motivation for learning during the lecture and the quiz score.
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Hideki MIKI, Makoto KOURAI
Article type: Article
Session ID: A-59
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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Using attribute effectively will raise efficiency of production. So attribute definition is required in each domain. In air-conditioning and plumbing domain, already there are some attribute definitions. But they are not related together. So there is restriction in use. In last fiscal year, a new attribute definition 'Air-Conditioning and Plumbing Attribute Set' is released. This is useful to relate other attribute definitions. So using attribute definitions is improved.
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Shunsuke NAKAMURA, Naoe NISHIHARA, Masaoki HANEDA, Shin-ichi TANABE
Article type: Article
Session ID: A-60
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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A field survey was conducted in an office that was set to be conditioned at 28℃ in summer to investigate the actual condition of the office and the effect on productivity. Air temperature in the office was 28.0℃. From the results of questionnaire, 62% of the office workers claimed dissatisfaction of thermal environment. The relation to the total rate of subjective symptoms of fatigue was stronger with thermal satisfaction than with air temperature. Given the previously found relationship between fatigue and performance, the performance of workers in 28℃ office can be maintained by improving their thermal satisfaction with appropriate measures.
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Yuichi NAKAGAWA, Shin-ichi TANABE, Katsuyuki INAGAKI, Osamu KIYOTA, Ka ...
Article type: Article
Session ID: A-61
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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This paper reports on the comparative evaluation of thermal comfort before and after the relocation. The investigation was conducted in two research laboratories to identify the effect of thermal environment on productivity. There were not differences in personal sit-down situation and activity during working hours between before and after the relocation. After the relocation, the ratio of occupants who feel comfortable for thermal environment was higher than the ratio before the relocation. In the result of winter investigation, the percentage of dissatisfied was lower after the relocation, and the improvement of workplace productivity was 0.9% compared with before the relocation.
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Takafumi KOGA, Go IWASHITA, Yasushi KONDOU, Takaharu KAWASE, Toshihiro ...
Article type: Article
Session ID: A-62
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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The method for the subjective evaluation on the work Place productivity already proposed had been changed for an educational institution. The drafting studio room of Musashi Institute of Technology, recently built, was evaluated by using this new subjective evaluation method. The discomfort of thermal environment was considered to be the largest in fluent productivity there. And the discomfort of air quality was the second largest. The positive effect of environmental quality should be discussed.
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Shoko UCHIDA, Ken-ichi KAMEDA, Shuzo MURAKAMI, Toshiharu IKAGA, Tatsuy ...
Article type: Article
Session ID: A-63
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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Many research papers have been published on the potential effects of indoor thermal environment of in offices on productivity. However, improving indoor environmental conditions causes increase of energy consumption about air-conditioning system. This paper reports a filed intervention survey on thermal environmental effects on the performance in an actual office on energy saving measure. When thermal environment changed, the performance is improved by 7.3% with room temperature.
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Reiko KUBARA, Yoshiyuki SHIMODA, Tomoji NAGOTA, Minoru MIZUNO
Article type: Article
Session ID: B-49
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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This study aims to reveal the advantage of district heating and cooling system (DHC) utilizing cogeneration system (CGS) in energy efficiency. Introduction of large-scale CGS gives unique advantage to DHC, and it is expected to contribute to energy-saving dramatically. The simulation results show that DHC could retain its energy-saving aspect in the future by introducing CGS that has high generating efficiency and high-efficiency turbo refrigerator for increasing the operation hour of CGS. However, these results depend on future technical developments and evaluating method of exhaust heat from CGS. Hence further study is required.
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Tomoji NAGOTA, Yoshiyuki SHIMODA, Naoaki ISAYAMA, Reiko KUBARA, Minoru ...
Article type: Article
Session ID: B-50
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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In this study, progress in energy efficiency of electric driven heat pump type district heating and cooling system (DHC) is predicted by a simulation model, which is developed based on an existing high energy efficiency DHC plant. The results show that utilization of natural and unused heat sinks/sources and variable speed technique are very effective in reducing energy consumption, and energy efficiency can reach 1.6 when all energy saving measures including abovementioned technique is introduced. These findings reveal the highest potential energy efficiency at DHC plant, as well as show what technique is effective to enhance energy efficiency.
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Toru ICHIKAWA, Yoshibumi SUGIHARA, Ryota KUZUKI, Wataru FUJISAKI, Keni ...
Article type: Article
Session ID: B-51
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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This study introduces a new and effective tool named SPREEM developed to evaluate running performance of a District Heating and Cooling (DHC) plant or a microgrid. While applying Life Cycle Energy Management (LCEM) concept for buildings, the tool was designed to incorporate distributed energy resources such as renewable energy, unutilized energy and CHPs into a DHC or a microgrid. A trial run at a DHC plant showed outstanding traceability proving its effectiveness in improving performance in an effort to reduce CO2 emission by building blocks.
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Ippei NAKAGAWA, Yoichi TANAKA, Hideki TANAKA, Masaya OKUMIYA
Article type: Article
Session ID: B-52
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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This paper describes performance of energy saving when the energy interchange between a hotel with a cogeneration system and an office building. This study discusses energy interchange for the patterns described below. Pattern1: Heat interchanged as many as possible from hotel to office building. Pattern2: Only surplus waste heat interchanged from hotel to office building. Pattern3: Heat interchanged bi-directionally between a hotel and office building. Finally, the reduction of primary energy is 417 GJ/year in pattern1, 36 GJ/year in pattern2, 3 GJ/year in pattern3.
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Yujin NAM, Ryozo OOKA, SuckHo HWANG
Article type: Article
Session ID: B-53
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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Groundwater heat pump (GWHP) system has been expected to achieve the higher coefficient of performance (COP) and more energy-saving than the conventional air-source heat pump (ASHP) system. However, it has not come into wide use due to restriction of pumping in an urban district and its lack of recognition as a design method. In this paper, the feasibility study of GWHP system under various locations was performed by using heating and cooling load model in building. In the result, cost pay back time of this system presented that it is efficient where heating and cooling load are balanced.
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Masaki NAKAO, Mayumi NAKAI, Masatoshi NISHIOKA, Minako NABESHIMA, Nobu ...
Article type: Article
Session ID: B-54
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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The efficiency of water chiller can be improved by utilizing low temperature water below thermal stratified layer in a harbor. This study examined the characteristics of stratified water for utilization of low temperature coastal water for the chiller. Field observations of water temperature distributions in harbor were carried out through the summer season. The vertical temperature distributions in the quay and off shore in the harbor were continuously measured over the time, and the difference between the quay and off shore water was examined.
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Hideharu NIWA, Kazunobu SAGARA, Yoshiyuki SHIMODA, Yozo KUNIMATSU, Kaz ...
Article type: Article
Session ID: B-55
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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The DHC system in the block 3 in Nakanoshima was planned to utilize "unutilized energy", such as thermal energy of river water. This DHC system was completed in December 2004, and two years passed after it began to operate the system. In this report outline of the performance evaluation on annual operation from 2005 to 2006 is described.
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Kazuhiro NAKAZAWA, Yoshibumi SUGIHARA, Kazunobu SAGARA, Yoshiyuki SHIM ...
Article type: Article
Session ID: B-56
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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In this report, the effect of energy conservation for thermal energy of river water was estimated with a simulator of the plant system made referring to the LCEM tool. It was found that river water cooling and heating system contributes to about 16% energy conservation compared with conventional system. Moreover, the simulator was used for the examination for the operation improvement, and the execution example was reported.
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Kunio Mizutani, Shoei Yoh, Yoshihiro SHIGENO, Hiroyuki NOMURA
Article type: Article
Session ID: B-57
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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This study is to report the floor radiant cooling and heating system using geothermal energy, which is applied in an elementary school in Hokuriku district. In the classroom area, radiating piping is equipped in the floor slab. Chilled/ warm water circulates through those piping and can reduce/ increase the floor surface temperature. Combination of this radiant cooling/ heating and natural ventilation achieves human-friendly cooling and heating system. Heat source of chilled water for floor cooling and heat pump is geothermal energy through radial well heat exchanger installed in the shallow aquifer.
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Takeshi AOI, Masayuki OTSUKA, Kentaro SEKINE, hitoshi FUKAO, Hiroshi I ...
Article type: Article
Session ID: B-58
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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The geothermal air-conditioning system adopted for the refurbishment project experimentally uses the heat characteristic of groundwater; for the building is situated on reclaimed land close to the river, and the groundwater level is about 1.5m under the ground, which is relatively shallow. This study aims to grasp the performance of the Geothermal air-conditioning system using the metal-reinforced PE tubes. In this paper, the authors discuss about examines performance of heat exchange of the soil which faced marine area and influence of quantity of heat exchange by a difference of materials of a PE pipe.
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Katsunori NAGANO, Shogo HORI, Sayaka TAKEDA, Makoto NAKAMURA, Tadahiko ...
Article type: Article
Session ID: B-59
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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The objective of this paper is to describe the performance of Ground Source Heat Pump (GSHP) system for heating and ventilation applied in an actual low energy house. Recently, in Japan, GSHP systems have been introduced, however only few of them have been demonstrated their efficiency. Firstly we investigated the performance of GSHP system which is applied to the actual low energy house of cold region by actual inspection. Secondly, ventilation system with earth tube was observed its efficiency. From the inspection, the system showed satisfied performance in terms of energy conservation.
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Gyu-young YOON, Kazuhiro NAKAZAWA, Hideharu NIWA, Mistuki MIURA, Masay ...
Article type: Article
Session ID: B-60
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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This study deals with the performance of Geo-Heat pump system which utilizes the underground soil as the heat sink or heat source. Geo-Heat pump system is composed of heat pump and earth pipe heat exchangers. And, the performance of earth pipe heat exchanger and heat pump influences each other. So, it is necessary that the consideration of both. Therefore, in this paper, the simulation of Geo-heat pump system was conducted with considering the performance of heat pump and earth pipe heat exchanger before introducing the system into a building in Osaka.
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Masato MIYATA, Harunori YOSHIDA, Bo LI, Masanobu AONO, Tadakatsu TAKEG ...
Article type: Article
Session ID: B-61
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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The present paper proposes the optimized operational method of a HVAC system with an underground thermal storage system to minimize the energy consumption of the system using simulation. The simulation model consists of two modules: soil and pile module and HVAC system module that consists of models of HVAC components. The optimal operational method proposed based on the results of the case studies can decrease energy consumption of the whole system about 43% compared with the present operational method, and can improve system COP of the ground thermal storage system from 3.26 to 5.04.
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Masanobu AONO, Tadakatsu TAKEGAWA, Yoshiyuki NAGURA, Youichi KOBAYASHI ...
Article type: Article
Session ID: B-62
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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This paper analyzes the operational data measured in an actual HVAC system with seasonal thermal storage from December 2005 to March 2007. The operational methods of the system were changed based on the results of case studies using the system simulation we developed. Compared with the performance of the system in the 1st year, the efficiency of discharge operation in the 2nd year was improved from 11.0 to 23.0, though the efficiency of storage operation was got worse from 7.89 to 6.74. In order to improve the efficiency of storage operation, the inverter of cooling tower was installed in December 2006, and the efficiency of the 3rd year was improved to 11.66.
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Takashi TERASHIMA, Katsunori NAGANO, Sayaka TAKEDA, Tadahiko IBAMOTO, ...
Article type: Article
Session ID: B-63
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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Field experiments have been carried out in the Hokkaido region with Ground Snow Melting Tanks (GSMT). Larger amount of snow can be charged by the use of shower. The total amount of snow melting is around 15.3 tons in 39 days when snow is shoveled periodically by a snow blower with the shower and nearly filled in the GSMT. The result of a numerical calculation indicates that the use of the shower can increase the snow melting performance.
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Katsunori NAGANO, Atsushi TSUCHIYA, Takao KATSURA, Makoto NAKAMURA, Sa ...
Article type: Article
Session ID: B-64
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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In this paper, the authors have carried out performance test and analysis of an integrated water-water heat pump unit. First, performance tests of the heat pump unit were conducted. The results show the outputs for hot water supply and heating in any condition are more than 1.6 kW and 7.0 kW, respectively when the compressor rotational speed is 5400 rpm. Next, cycle simulation program of the heat pump unit was developed to examine the experimental results more detail. As a result, it was confirmed that the value calculated by the cycle simulation reproduced the value obtained by the performance test when the compressor rotational speeds were 3600 rpm and 5400 rpm in conditions of T_<1in>=0℃ and T_<2out>=40℃.
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Shinya TANAKA, Yasuhiro HAMADA, Kentaro NAGAHIRO, Katsunori NAGANO, Hi ...
Article type: Article
Session ID: B-65
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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This study describes analyses on characteristics of underground and it's thermal energy potential by using digital national land information. We made maps that show the introduction potential of the under ground thermal energy system in Asahikawa by using geographic information system(GIS).
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Shigeaki NARITA, Katsunori NAGANO, Sayaka TAKEDA, Kohsuke NIKI
Article type: Article
Session ID: B-66
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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An increasing number of residential houses are using Ground Source Heat Pump systems all over the country in these years. It is well known the system is more effective particularly in cold climate terrain. However, there are few studies on monitoring the operation through years in an actually occupied house. We now carry on measuring the performance of a detached house in Furano City, which is one of the coldest district in Japan. This is a report on the result of the first year.
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Sayaka TAKEDA, Katsunori NAGANO, Takao KATSURA, Shogo HORI, Tadahiko I ...
Article type: Article
Session ID: B-67
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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A ground source heat pump (GSHP) system has been installed into a new building in the Soen campus of Sapporo City University. The ground thermal energy is extracted through the ground heat exchanger, steel foundation piles and boreholes and utilized in the ventilation system for heating and cooling of fresh air. The extracted heat is increased through the heat pump in the heating period. On the other hand, the cold energy from the ground is directly utilized for free cooling without the heat pump in the first year's operation in 2006. This paper describes the system flow and the result of the free cooling operation during summer. It is predicted that changes of operating conditions of the circulating pumps will lead to increase the system COP to around 3.0.
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Takao KATSURA, Katsunori NAGANO, Sayaka TAKEDA, Shogo HORI, Tadahiko I ...
Article type: Article
Session ID: B-68
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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This paper constitutes Part2 in the series of assessment of a ground source heat pump (GSHP) system in Soen campus of Sapporo City University. In this paper, the authors introduce performance and refinement of the GSHP system operation during heating period. In addition, it is shown that the measured temperatures can be reproduced by the calculation with the design tool. Finally, total assessment of the GSHP system is conducted. Then, it is expected that the GSHP can operate with high efficiency long term. From comparison to gas boiler system, the GSHP system can reduce CO_2 emissions and running cost of 40 % and 60 %, respectively.
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Keita KASAHARA, Yasuhiro HAMADA, Yuki ITO, Makoto NAKAMURA, Kouhei KUW ...
Article type: Article
Session ID: B-69
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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If snow and ice can be kept and utilized as cooling sources for space cooling, they will have possibility of energy conservation and CO_2 reduction. Thermal utilizations of snow and ice have been noticeable since the Law Concerning Special Measures to Promote the Use of New Energy was amended to add the use of them. Firstly, this paper presents Snow Storage System by using a renovated space that we propose for the purpose of initial cost saving. Secondly, the system outline, which is applied to an actual office in Asahikawa City, is shown.
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Kenichi NAKASHIMA, Yuuji MIYAJIMA, Makoto TANAKA, Hiroshige KIKUCHI
Article type: Article
Session ID: B-70
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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An operating efficiency of heat source system for clean room is relatively low because water temperature generated by chilling unit is lower than required from the type of heat load and control method of free-cooling is not optimized. To improve the operation efficiency, we suggest a structure of heat source system which changes supply water temperature depend on a heat load and control method which use free-cooling efficiently. As a result of practical simulation, energy consumption of heat source can be reduced higher than 30% by automatic operation and by installing chillers in each type of heat load.
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Kenzo SUZUKI
Article type: Article
Session ID: B-71
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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Three houses in Hokkaido that have CO2 heat pump water heater for cold regions were investigated from the view point of its energy saving, and its more efficient usage. The coefficient of performance (COP) of heat pump in a house with a smaller amount of hot water consumption and with a hot water tank installed in a cold garage shows much lower value. It was proven that 2.2〜1.7, total COP became 1.8〜1.0 for COP of annual heat pump simple substance.
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Keigo MACHIDA, Maria ARAI, Shizuo IWAMOTO, Takeshi KONDO, Tadahiko IBA ...
Article type: Article
Session ID: C-51
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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In this research, the effects of the peak shaving control of air conditioning systems using the PCM (Phase Change Material) for ceiling board in the office building were examined. The thermal capacity and thermal conductivity of the PCM ceiling board was measured by using small experimental chamber. The thermal capacity of the PCM ceiling board is approximately 300 kJ/m^2. It is 3 times that of ordinary rock wool ceiling board. The thermal conductivity is from 0.034 to 0.058 W/mK depend on kinds of clumpy of microcapsulate PCM.
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Maria ARAI, Keigo MACHIDA, Shizuo IWAMOTO, Takeshi KONDO, Tadahiko IBA ...
Article type: Article
Session ID: C-52
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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The control method of thermal storage quantity and the reduction effect of heat source capacity were calculated using the simulation program. Thermal storage quantity is controlled by the inside temperature of the PCM ceiling board. The integrated thermal load of PCM ceiling model was 9% greater than that of the rock wool ceiling model. However, the running cost is 92% lower than that of the rock wool ceiling model. The capacity of heat source can be reduced from 17 to 20% by using the PCM ceiling board.
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Satoshi MIYAGI, Yoshiyuki KAMIYA
Article type: Article
Session ID: C-53
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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The authors proposed floor thermal storage system which consisted of deck plate slab, guide plate and jelled water thermal storage body above the slab forming air flow channels in the previous reports. In this study, experiments were conducted by changing air flow directions and its flow rates, charging and discharging heat capacities and heat flow rates through floor and ceiling were measured. In addition, the temperatures of slab and jellied water thermal storage body were calculated and compared with the results of the experiments. Then the effectiveness of installed jellied water thermal storage body was identified by the increase of heat capacity stored and the decrease of heat loss through floor.
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Takuji NAKAMURA, Katsunori NAGANO, Sayaka TAKEDA, Sota OKABE, Masashi ...
Article type: Article
Session ID: C-54
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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The aim of this study is to develop an air conditioning system in which dehumidification is separated from the cooling process. In this part, we discuss the needed amount of PCM and thermal characteristics during the peak cutting period in the PCM floor supply air conditioning system. The use of PCM more than 6 kg/m^2 can provide continuous discharge from PCM and then sufficient effect of peak cutting throughout cooling season. The result of the calculation also demonstrates the comfortable thermal environment in the room space.
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Junichi WAKAMATSU, Yasushi ABE, Masato SASAKI, Takashi YANAI
Article type: Article
Session ID: C-55
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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In the urban mid layer office building, in order to construct 40m×40m open office space, large prestressed concrete slabs whose parts had vacancy layer and void had used. By using these vacancy layer and void as return air flow route on air conditioning mode and as thermal storage material on non-air conditioning mode, integrated system between structural material and air conditioning system was designed. Previously, indoor thermal environment and energy consumption of the system were evaluated using heat ventilation network calculation. In this report they are verified using BEMS and measurement equipment at the actual building
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Koki KIKUTA, Masamichi ENAI, Hirofumi HAYAMA
Article type: Article
Session ID: C-56
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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The aim of this research is to reveal the possibility and problems of a floor cooling by using thermal storage cooling system for external insulated houses based on actual survey. We practice performance evaluation of this system as the whole house not the only heat pump or circulation pump. The results are as follows; (1) On-off frequency of heat pump corresponded with quantity of cooling / quantity of removal, and the main factor for on-off problem of heat pump was surplus cooling. (2) CASE2 of nighttime operation was high cooling power, for example average COP2.8 and SCOP1.9. As a result, the difference of 35% occurred between COP and SCOP.
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Takashi SHIMURA, Masazumi GOHDO, Yasuo IGUCHI, Kunio MIURA
Article type: Article
Session ID: C-57
Published: August 24, 2007
Released on J-STAGE: August 31, 2017
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This paper will report the 2nd experimental facility specification that consists of "Energy conservation system by separating dehumidification in air-conditioning'. The high efficient cooling operation separating dehumidification was verified, that was the low compression ratio of compressor and the long time flee-cooling without compressor operation. Ice making evaporator using capillary tube made the ice storage tank compact and improved ice-melting characteristic. The central monitoring system introduced in this facility used IP-network, so that was free of a particular client.
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