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Kunihei YOSA, Hideo MIYAHARA, Naoki YOSHIDA, Satoshi NISHIWAKI, Shinzo ...
Article type: Article
Session ID: C-55
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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An energy saving system called Elevated Temperature Chilled Water (ETCW) System is developed for electronics manufacturing facilities. The ETCW System has the following characteristics. 1) Supply chilled water temperature is set at 12℃, which is higher than that in conventional system, so higher COP of chillers can be obtained. 2) A large temperature difference of 10℃ between return and supply chilled water is adopted, so that the flow rate of chilled water can be reduced. 3) Every 2 chillers are connected in series and the outlet temperature of the chilled water from the upstream chiller is set at 17℃, so the upstream chillers are operated with even higher COP. In addition, they can be operated with free cooling mode for a longer period of time. 4) Boiler is not required because of pre-heating by the 12℃ chilled water, heating by hot water from heat pump chillers and humidification by air washer.
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Qi Tian, Naoki Karino, Keizou Mizuno, Noriyoshi Yokoo, Tatsueo Oka
Article type: Article
Session ID: C-56
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The prediction method for free cooling performance with commercially available cooling tower are described in this paper with the theoretical formulae which have been proposed to predict the performance of cooling tower. The water temperature and the quantity of flow were measured in summer and winter in order to derive the parameters and the characteristics of evaporative cooling tower. The predicted inlet and outlet water temperatures were agreed well with the measurement, and it also shows the free cooling system with evaporative cooling tower may be available in Japan.
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Masao ANDOH, Akira MAEYAMA, Yoshimi TAKEUCHI, Teruo MIKAMI, Naoki OSAK ...
Article type: Article
Session ID: C-57
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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Heat source system for air conditioning in Y building was renewed for the purpose of energy saving, and the operation performance of Heat source system which is composed of high efficient Gas-Fired absorption chiller and cooling tower was measured. As a result of evaluation, the periodical averaged COP of heat source system was 0.91, and the COP of heat source R-1 and R-2 was 1.0 and 0.86 respectively. Also, the COP of unit of absorption chiller was around 1.35 within the range of heat load is higher than 25% of maximum performance.
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Akira MAEYAMA, Masao ANDOH, Yoshimi TAKEUCHI, Teruo MIKAMI, Naoki OSAK ...
Article type: Article
Session ID: C-58
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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We verified efficiency of heat source system for air conditioning in Y building in previous report. In this report, we investigated the relationship between COP of heat source system and the following factors, (1)load factor, (2)chilled water supply temperature, (3)cooling water temperature, and (4)flow rate of cooling water, each data was obtained through the real operation of energy-saving optimized control system. Furthermore, from the comparison between the data of this heat source system and simulated data of usual method, we confirmed that energy-saving optimized control system had approximately 21% of energy-saving effect.
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Toshihiko FUJITA, Yoshimi TAKEUCHI, Mitsuo KOJIMA, Tohru ICHIKAWA
Article type: Article
Session ID: C-59
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The performance of a hybrid system of a high efficiency gas engine driven centrifugal chiller and an exhaust gas heat recovery absorption water chiller-heater has been investigated by a simulation model analysis. The amounts of seasonal and annual energy consumption and CO_2 emissions of the hybrid system has been estimated in the cases where it is applied to office, hospital, shop, and hotel buildings with ordinary electric, air-conditioning and hot water supply loads. Then the hybrid system has been evaluated by comparing with some other systems, such as a combination of a gas engine cogeneration system and an electric centrifugal chiller system.
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Daisuke KUROE, Yasunori AKASHI, Hiromi SUGIYAMA, Yasuhiro KUWAHARA, Yo ...
Article type: Article
Session ID: C-60
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The purpose of this paper is to clarify energy performance of cooling plant system for building air-conditioning using actual measured operating data and numerical simulation analysis and to considerate the influence on electric power consumption of changing set values. The cooling plant system is installed in an industrial building and has some high-efficient technologies which are inverter chillers, an integrated cooling tower and a free-cooling system. The maximum COP of inverter chiller reaches about 18 under particular condition of partial load rate, cooling water inlet temperature and chilled water outlet temperature.
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Izuru KONDO, Masayuki SASAKI, Satoru TAKAHASHI, Itaru YAMAGUCHI, Takas ...
Article type: Article
Session ID: C-61
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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We have replaced existing 500 USRT turbo chiller to a same capacity one with inverter in a certain semiconductor factory in Tohoku region. We surveyed actual data to see how much the efficient power it generated and the result was satisfactory. The electricity and COP line were plotted on the diagram called part-load-characteristic line. The annual power saving was estimated about 350 MWh and 150 t-CO2.
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Tatsuo SANMA, Kazutaka KURASHIGE, Satoshi UJIIE, Masahiro INOUE
Article type: Article
Session ID: C-62
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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Heating tower system, which is used for both cooling and heating with water-cooled heat pump chiller, is not so widespread up to now because of the reasons as follows; necessity of a complex defroster, large space required for installation, and expensiveness. Therefore, we developed the compact and economical closed-type heating tower with the simple built-in defroster. The efficiency of the developed heating tower system is on the highest level in various air-conditioning methods.
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Kika TOU, Toru ICHIKAWA, Noriyoshi YOKOO, Tatsuo OKA
Article type: Article
Session ID: C-63
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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Best mix systems with gas and electricity are evaluated from the view point of energy consumption, primary energy and the effect of sensitive to heat due to the released heat from the system. Best mix systems are CGS with HP heat storage system, and gas absorption with HP heat storage system in which absorption refrigerators are triple effect refrigerator with 1.6 for COP. Primary energy is reduced according to the ratio of CGS and the effect of sensitive to heat is reduced by adoption of cooling tower which converts sensible heat to latent.
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Weihang LIN, Toshihiko FUJITA, Shigeki KAMETANI
Article type: Article
Session ID: C-64
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The simulation model which is able to calculate an energy consumption and environmental performance of air conditioning systems was developed. Using this model and various weather conditions (Sapporo, Tokyo and Kagoshima), a characteristic alternation of four kinds of heat source and supplying hot water system is clarified.
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Masanori NAGAOKA, Michio HYUGA, Kazutomi KONNO, Hiromi SUGIYAMA
Article type: Article
Session ID: C-65
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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This paper describes a development and verification of the highly accurate energy simulation tool on heat source equipments. This tool can calculate the difference of the energy consumed according to the control method and can be used easily by the engineer not having a programming skill.
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Takashi YANAI, Kimihiro HONDA, Yoshimi TAKEUCHI, Ritsu HOMMA
Article type: Article
Session ID: C-66
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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There are three challenges in this study. First, evaluation of energy and water cycle system matching the city infrastructure Secondly, evaluation of the air-conditioning system and the load characteristic in the office that occupies most of building Thirdly, evaluation of BEMS utilization as assessment tool This report shows the outline of CGS and the result of verification of effects which is a part of the first challenge.
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Yohei HORIBA, Kimihiro HONDA, Takashi YANAI, Kiyomasa MATSUHASI
Article type: Article
Session ID: C-67
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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Because the water supply and the drain load concentrate, the high-rise office building in the central area of Tokyo has extremely large influence to the city infrastructure. In the office building, the ratio for a water supply such as the lavatory washing water is many. Therefore, it is an important problem to substitute recycled wastewater load by "Water circulation use system" by the rain water use and the gray water recycling, and to reduce the load to the city infrastructure. On the other hand, the investigation and the examination of the design basic unit for the water supply that considers off-peak during year are comparatively little. In this study, we analyzed tendencies to various water supply loads, the water supply balances, and the amounts of recycling in the high-rise office building based on the real operation data, and standardized the water supply load during year.
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Kimihiro HONDA, Takashi YANAI, Masashi TAKESAKO, Eriko WATASE
Article type: Article
Session ID: C-68
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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It is the important element of the air-conditioning system to adjust the thermal environment and the air-conditioning system for the indoor environmental quality and responding to increase of the energy consumption with the progress of IT. And the operation situation of the air-conditioning system depends on specific conditions of each building. We show the indoor thermal environment load and the operation condition of air conditioning system on the third and the fourth reports. On this paper, we report the outline of the air-conditioning system, and evaluate the measured energy consumption.
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Masashi TAKESAKO, Eriko WATASE, Kimihiro HONDA, Takashi YANAI
Article type: Article
Session ID: C-69
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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It is very difficult to grasp about thermal load and energy consumption in each Tenant. In this case, we could investigate about actual conditions of thermal load and energy consumption energy about air-conditioning system in all tenants using the data which can get with an automatic control system. Additionally, we evaluated about indoor environment in the typical tenant at the same time. In this paper, we report the result of study about characteristic of thermal load and energy consumption of all tenants in the building and the difference between actual conditions of each tenant.
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Eriko WATASE, Masashi TAKESAKO, Kimihiro HONDA, Takashi YANAI
Article type: Article
Session ID: C-70
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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In this paper, we report on the operation result of "Practicable BEMS". We have already reported on the outline and the feature of "Practicable BEMS". Additionally, The study of results of the consumption energy was reported by the former reports. Therefore, this report shows the operation monitor of the equipment that uses BEMS and results of the amount of the reduction energy. Moreover, the difference between an indirect measurement and a direct measurement of the energy consumption was comprehended according to results, and the trial of an indirect measurement as a simple measurement was considered. Additionally, we investigated the usage condition of BEMS by building managers for the confirmation of "Practicable".
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Ryuichiro GOTO, Yasuhiro HAMADA, Hideki KUBOTA, Makoto NAKAMURA, Kouhe ...
Article type: Article
Session ID: C-71
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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This paper describes performance evaluation of a polymer electrolyte fuel cell for applying to the demonstration on fuel cell for residential cogeneration systems in cold regions. First, experiments of characteristics on heat and power generation were carried out. Alternating current electrical efficiency and heat recovery efficiency at a rated output operation were quite high; 33.0% and 42.1%, respectively. Second, characteristics of partial load, start-up time, load following and exhaust gas were clarified.
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Yasuhiro HAMADA, [in Japanese], Ryuichiro GOTO, Hideki KUBOTA, Makoto ...
Article type: Article
Session ID: C-72
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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This study aims to find the optimum utilization of fuel cell cogeneration system through the demonstration Experiment. In order to verify the availability of new optimum system simulation, we perform continuous operations and optimum operations of the fuel cell in the experimental house.
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Hidetoshi HORI, Ryuichiro GOTO, Yasuhiro HAMADA, Hideki KUBOTA, Makoto ...
Article type: Article
Session ID: C-73
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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This report describes the field experiment concerning effect on introduction of residential Cogeneration System for the general detached houses in cold regions. First, the outline is shown about the system itself and experimental condition. Secondly, operation result on the representative day and energy-flow on the representative week is shown. And, energy conservation, the environment, and the economical effect are calculated.
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Kazuya SHIOMI, Yasuhiro HAMADA, Takanori SUDA, Ryuichiro GOTO, Hideki ...
Article type: Article
Session ID: C-74
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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For the purpose of improving start-up property and load following capability of fuel cell hybrid systems, this study describes hydrogen energy system for the fuel cell. First, hydrogen absorbing alloys for the use of normal temperature and atmospheric pressure are selected. Second, we carry out absorption and desorption experiments in order to analyze the utilization of hydrogen storage system. Finally, we develop an unit container for full-scale application for the absorption and desorption experiments.
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Shuhei SUZUKI, Yasuhiro HAMADA, Takanori SUDA, Ryuichiro GOTO, Hideki ...
Article type: Article
Session ID: C-75
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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This study aims to develop a future energy system using fuel cell, hydrogen and renewable energy in cold regions. We carried out experiments on characteristics of hydrogen storing alloys. First, we carried out theoretical analyses on hydrogen storing alloys for a residential energy system. Secondly, calculated results were compared with measured values.
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Takashi AKIMOTO, Masahhiko SATO, Masaaki SUZUKI, Mitsuyasu IROKAWA, Yo ...
Article type: Article
Session ID: C-76
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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Number of gas co-generation application in large hospitals is increasing recently for the purpose of effective energy use. From commissioning stand of view, it is important to investigate the collection method of equipment operation data, assessment method, and system efficiency. We have evaluated the performance of co-generation system on a large hospital from March, 2005 through February, 2006. The cause of decreased efficiency of the system in January and February, 2006 has examined with the relationship of recovered energy and hot water temperature at heat exchanger. Consequently, total efficiency of the system is at the high level during measurement period.
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Kumi UEKI, Yuji SUGIMOTO, Naoki UYAMA
Article type: Article
Session ID: C-77
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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In the Hotel New Otani, there are many types of energy saving facilities, that make a large system mainly on CGS. We continued the evaluation of CGS, and got energy saving, and cost-saving. In this paper, we conducted an investigation into the results and LCC of CGS for a long term of 15 years and arranged it. In addition, we performed recent evaluation of CGS and the driving method except CGS confirmed that they could reduce CO2 emission of 10.8%.
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Masanobu SASAKI, Tetsuya MAEKAWA, Tatsuo Oka
Article type: Article
Session ID: C-78
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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Two kinds of CO2 emission coefficients caused by electricity consumption have been used for the evaluation of Cogeneration System's global warming impact. One is the average of all power sources' CO2 emission coefficients, the other is the average of thermal plants'. In this paper, these two coefficients are compared when considering Cogeneration System's actual impact on electric power reduction in power system network.
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Tsukasa TSUKIDATE, Masahiro HAYASHI, Jun AKIMOTO, Shuuhei SAKIMA
Article type: Article
Session ID: C-79
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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We proposed the numerical simulation model of the fuel cell system for residences that was considering the temperature transition of the system. It was shown that the calculation result almost corresponded to the measurement result in a hot water supply mode.
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Michinobu FURUKAWA, Hideyuki HOSONO, Toshihiko KOYAMA, Sanae NAMATAME
Article type: Article
Session ID: D-50
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The objective of this paper is to gather up-to-date energy final demand data of generic office buildings and establish a data set of average energy demand for electricity, air conditioning, and heating, and to compare it to an early research well-known as a standard energy demand data of office buildings, which should provide not only a useful data set of energy demand of them, but make us aware of changes of energy usage pattern. As a result of this analysis, it is verified that an annual demand for both power and air conditioning increase, while that for heating decrease, and hourly demand patterns are flattening out.
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Takayuki MATSUSHIMA, Tatsuo NOBE
Article type: Article
Session ID: D-51
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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By the former report characteristics of heating and cooling load of the building were shown by the heating and cooling load data sheet. The operation schedule of cooling and heating load was sorted by this report. The elements of the thermal load classification are daily variation, weekly variation, and yearly variation. The pattern of 64 exists theoretically. But, a thermal load pattern is limited by the operation schedule. A representative cooling and heating load pattern was extraction from a result of classification.
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Yuichi NAKAGAWA, Yoshihiro AIZAWA, Osamu KIYOTA, Katsumi NIWA, Kozo KO ...
Article type: Article
Session ID: D-52
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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In this investigation, the working situation was investigated by sensors and questionnaire survey. The number of workers, the sit-down situation, and walking distance for the real office space were investigated which might changed hourly by an individual business circumstance. The results of seating and occupancy rates were around 30%. The average walking distance was 300m〜500m. The results of seating and occupancy rates of this laboratory were lower than that of compared general offices by our previous measurements.
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Takamasa SHINKAWA, Tatsuo NOBE
Article type: Article
Session ID: D-53
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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This paper examines seat occupancy rate and electrical demand in offices to determine the internal load factor. This investigation is key toward optimizing air-conditioning operation. This study was conducted in four offices that differed in numbers of workers and types of work. The average seat occupancy rate during office hours was 39.8%, 49.2%, 33%, and 48.4% in offices A, B, C, and D, respectively. Although seat occupancy rate differed by office, the trends discovered were similar. The differences were due to the different types of work. The electrical demand of office machines during office hours was almost constant; there was no correlation to seat occupancy rate. Thus, emptying seats vacated by office workers does not provide energy conservation.
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Teppei Nishimura, Tomoyuki Chikamoto, Kiichiro Ninomiya
Article type: Article
Session ID: D-54
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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This study aims to separate hourly energy consumption in the building according to the spaces and the elements of cooling and heating load. It also aims to develop the technique which can estimate separated energy consumption for each demand by using electric power and gas dealings meter, and sensing information in rooms and outside. With the technique, which will be developed in near future, the equipment in the building will be managed easily.
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Akira Urano
Article type: Article
Session ID: D-55
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The author calculated the influence of global warming on office building cooling load using building heat load simulation and outputs of coupled general circulation model. The meteorological data for heat load simulation was based on global warming prediction and expanded AMeDAS weather data. It is predicted that the buidling cool load increased 20% in 50 years, and 50% in 100 years.
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Kimiko KOHRI, Hisaya ISHINO, Atsushi MOROOKA, Takashi SUZUKI
Article type: Article
Session ID: D-56
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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Expanded AMeDAS design weather database was released last year. This paper examined the adequacy of the heating and cooling peak loads obtained by using Expanded AMeDAS design weather data for various cases. The probabilities of occurrence of the load exceeding the design peak value were used for the examinations.
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Tadashi AOKI, Mitsuhiro UDAGAWA, Hyunwoo ROH
Article type: Article
Session ID: D-57
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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In this study, the possibility of year-round cooling system combining the building thermal insulation and the ventilation rate of fresh air is discussed from the viewpoint of designing the air conditioning system of office buildings. The simulation study was carried out for five cities in Japan. The simulation results show that, the effective year-round cooling system in office building is possible using the insulated windows and the free cooling in winter and intermediate seasons.
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Tomohiro ATAKU, Shin-ichi TANABE, Youichiro UMEZU, Yoshihide YAMAMOTO
Article type: Article
Session ID: D-58
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The importance of the efficiency improvement of the heat source partial load operation is clarified by the calculation on the former reports. In this paper the definition of the partial load, the partial load operation, and the possibility of factor improvement are discussed. Based on the calculation system on which it reports by the former report, the primary energy consumption related to the improvement case with the partial load efficiency of the heat source and the control of the temperature of chilled water are calculated and compared. As for the improvement of the partial load operation efficiency of the heat source, it is shown that there is a great efficiency in the consumption energy reduction.
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Takamitsu SATO, Tadahiko IBAMOTO, Takayosi SUZUKI
Article type: Article
Session ID: D-59
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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We have measured the temperature of the ground of the circumference of an underground substation over for 18 years. There is a place by which temperature was stabilized. However, there is a place where temperature continues rising. We calculated the time lag using the personal computer. Consequently, the time lag found that it was related to the rate of the thermal diffusivity rate. We presumed the time lag of the ground by processing a measurement result statistically. We compared the calculation result with presumed value, and found the heat physics value which is comparatively well in agreement.
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Yasutaka MURATA, Koji SAKAI, Yoh MATSUO
Article type: Article
Session ID: D-60
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
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The purpose of this study is to establish a simple evaluation method of building seasonal load when the building is designed to in take outdoor air intentionally. For simplification of the method, an expression to estimate pressure difference was made, and the number of parameters which were related to natural ventilation was reduced. Using these results, it was showed how to evaluate seasonal heat load of natural ventilation.
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Seiko KODAMA, Yasuhiro NAKAMURA
Article type: Article
Session ID: D-61
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The Vigor in a shopping district having arcade space was brought by conveying a sound and a smell from the opened door of stores for a lot of customers. But keeping the door open faced a street loses a large amount of energy at the same time. So we measured the temperature distribution and an energy loss at a store in a shopping district having arcade space and the model room our university.
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Atsushi YAZAWA, Tatsuo NOBE
Article type: Article
Session ID: D-62
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The purpose of this study was to estimate the skin load of buildings using the thermally analogous model, which reduces the size of buildings concerning the heat. The skin load of actual buildings is obtained from two thermally analogous models that differ in internal temperature. The experiments were conducted to evaluate the influence of the size of models using two models by which sizes differ. The experimental results differed from theory.
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Yoshibumi SUGIHARA, Hideharu NIWA, Shigeru TOKITA, Katashi MATSUNAWA, ...
Article type: Article
Session ID: D-63
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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A frame work and solution of the tool were written in the last paper. Working is pushed forward, and simulation of realistic dimensions has been enabled now. This paper shows the total scheme which consist of several heat sources and several air conditioners, and this paper shows the detail of heat source objects. This handling is easy. And this is a visual and new conception program.
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Mika YOSHINAGA, Hideharu NIWA, Katsuhiro MIURA, Hideharu KOMODA, Tetsu ...
Article type: Article
Session ID: D-64
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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In previously papers, summary of a HVAC system simulation tool for Life Cycle Energy Management and details of the developed heat source objects are reported. In this paper, details of the developed HAVC system objects (a room, VAV / CAV damper unit, duct, the cold / hot water coil, a humidistat, and flesh-air intake unit) are described.
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Eisuke TOGASHI, Shin-ichi TANABE, Hideharu NIWA, Yoshibumi SUGIHARA
Article type: Article
Session ID: D-65
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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This paper presents a Neural Network component for "HVAC System Simulation for LCEM (Life Cycle Energy Management)". Using real measurements of actual buildings in Japan, model of an absorption chiller is developed by Neural Network component. Performance of predictions (cooling water temperature, chilled water temperature, energy consumption of gas and electricity) are tested by BMS data. If models are updated every day, average error of temperature predictions (cooling and chilled water) is about 6% to fluctuation band. Total error of gas consumption and electricity consumption is 623m^3 and 5kWh respectively.
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Masaya OKUMIYA, Hideharu NIWA, Yoshibumi SUGIHARA, Mika YOSHINAGA, Mas ...
Article type: Article
Session ID: D-66
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The HVAC system in a real building was simulated by the energy simulation tool being developed. In order to confirm the practical utility of the tool, the studies are conducted each on the design phase, the performance verification phase, and the operation phase. Therefore the tool could simulate from small system such as simple equipment to total HVAC system and might have applicability to the fault detection and the maintenance management.
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Kenichiro WATANABE, Masashi MOMOTA
Article type: Article
Session ID: D-67
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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To evaluate the regional energy system, the outline of approach was shown in this paper. This approach is focusing on to evaluate activities for efficiency enhancement of the system introduction. In addition, this approach is developed compared with previous other studies in Japan. Through this study, requirements to classify into the evaluation phase and to classify the position of evaluators were presented. As the result, 5 of evaluation indexes and 14 of evaluation objects were assigned.
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Masashi MOMOTA, Kenichiro WATANABE, Takashi INOUE, Kouji MIYOSHI
Article type: Article
Session ID: D-68
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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Questionnaire for a factor extraction of the system introduction efficiency was performed. From this result, which factors have an effect on which evaluation objects, which evaluator has an interest in which factors and tree diagram for the evaluation was shown. This diagram features that the factor overlaps with two or more evaluation objects. This overlap makes evaluation method appropriate. In addition, this diagram is able to use for checklist for DHC. Through this questionnaire, consciousness research for heat service experts was also performed. A consciousness difference between respondent who is involved in design and respondent who is involved in operation was presented.
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Naoaki ISAYAMA, Yoshiyuki SHIMODA, Tomoji NAGOTA, Reiko KUBARA, Minoru ...
Article type: Article
Session ID: D-69
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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This study aims to verify the advantages of district heating and cooling system in energy efficiency. From the measurement data, the parameters which characterize the energy efficiency of heating/cooling plant are identified for DHC and individual building respectively. Simulation model which is able to consider the difference in these parameters is developed and the advantages and disadvantages of district heating and cooling system and the effect of each parameter are examined by the simulation model. The results show that the energy efficiency in DHC is 'concentration effect', 'high-efficient equipments' and 'introduction of combined heat and power'.
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Reiko KUBARA, Yoshiyuki SHIMODA, Tomoji NAGOTA, Naoaki ISAYAMA, Minoru ...
Article type: Article
Session ID: D-70
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
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This study is aimed to verify the utility of DHC as an urban energy system in the future. Firstly, we identified factors which affect energy efficiency by analysis on an actual high-efficiency DHC, and then evaluated the energy saving potential by the simulation model developed on the actual condition. In consequence, it became apparent that introduction of CGS and optimal operation of it, adoption of high-efficiency equipment and an invitation of preferable customer are essential elements to realize a high-efficiency system for a system using absorption chillers and boilers. With these elements, the value of DHC as an urban energy system will be growing higher.
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Hirotake Shingu, Rie Nakajima, Harunori Yoshida, Fulin Wang
Article type: Article
Session ID: D-71
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
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In order to improve the energy performance of an existing district heating and cooling(DHC) system, retro-commissioning was analyzed using graphical simulation method and mathematical models, and improved operation schemes were proposed. The simulation results show that the energy comsumed by chiller and cooling tower can be reduced by 2.2% if the cooling water temperature set at an optimal value of 22℃. Becaouse the current return temperature of chiller water is lower than design value of 13.5℃, the simulation shows that the total energy consumption of the cooling plant can be reduced by 9.5% if the return temperature of chiller water could be kept at 13.5℃.
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Tomoji NAGOTA, Yoshiyuki SHIMODA, Minoru MIZUNO
Article type: Article
Session ID: D-72
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
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The revolutionary energy service "Climate Agreement", under which the required indoor temperature should be kept at a fixed price per square meter, is provided by a heat supply company in Sweden. This agreement provides the heat supply company the chance to optimize the entire heat source system including heat demand, as well as profit from energy saving. This point of view is effective at reducing energy consumption in a market economy. In this research the actual condition of this approach was surveyed to consider its feasibility and development in the Japanese context.
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Ippei NAKAGAWA, Hideki TANAKA, Masaya OKUMIYA
Article type: Article
Session ID: D-73
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
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This paper describes performance of energy saving and environmental load reduction if introduced energy interchange between plural buildings at the central part of Nagoya. Extracted 6th building type by using GIS (Geographic Information System), and then considered only three buildings (office, hotel, store) in this paper. Results of total CO_2 reduction at Nagoya by energy interchange between existent hotel and new office is 7786.7 [t-CO_2/year], between existent store and new office is 3095.7[t-CO_2/year].
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Ryouichi KUWAHARA, Masaki SHIOYA, Masaaki IMAI
Article type: Article
Session ID: E-51
Published: September 05, 2006
Released on J-STAGE: August 31, 2017
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We measured an indoor enviorment using ceiling radiant air-conditioning system in summer and winter. This system becomes uniform the vertical temperature distribution and can make a comfortable space. The value of PMV became it within the range of ±0.5 in summer and winter. It was able to be confirmed that a water roots refrigerator was suitable for the equipment combined with the radiant air-conditioning system.
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