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Yoshiyuki SHIMODA, Yoshitaka UNO, Ryo SUNAGAWA, Yoshie TOGANO, Ken-ich ...
Article type: Article
Session ID: B-22
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Energy efficiency improvements of renovated district heating and cooling (DHC) plants were evaluated by simulation. In this paper, expected total annual energy efficiency improvement is predicted by the simulation model for the renovated plant. Some parameters of this simulation model are modified in previous paper. Before annual simulation, accuracy of this model is examined based on the comparison between simulated and measured data for one month operation. From the result of annual energy simulation, 31 % of energy efficiency improvement is expected. Contribution of each replaced equipment to total efficiency is evaluated quantitatively. Total energy flows before and after renovation are compared.
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Toru ICHIKAWA, Kenichiro WATANABE, Ryota KUZUKI, Takehito IMANARI, Yos ...
Article type: Article
Session ID: B-23
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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The validity of SPREEM was tested in performance improvement of the DHC. Accuracy of the existing reproduction calculation by SPREEM was shown, and the result was validated. Two improvement plan were examined. In Case 1, the steam driven turbo-refrigerator was removed, and high efficiency gas engines and electric turbo-refrigerators were installed. And gas engines generate electricity and drive electric turbo-refrigerators. In Case2, the steam driven turbo-refrigerator was removed furthermore and it was moved in electromotive turbo-refrigerators. And the operating sequence of the machinery was made adequate. As a result, large reduction effect of the energy was found in especially Case 2. The mechanism of the reduction were shown in detail, too. Easy operation and high accuracy in the calculation result were proved.
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Yuna SATO, Toru ITHIKAWA, Ryota KUDUKI, Shunsuke KAIDO, Noriyoshi YOKO ...
Article type: Article
Session ID: B-24
Published: August 18, 2009
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 using waste heat from incimeration plant in Utsunomiya city. We divide area around Utsunomiya station into 9 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 HP. 2) There is absorption refrigerator across all districts. 3) In addition to the second scenario, waste heat was utilized.
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Kenichiro WATANABE, Masashi MOMOTA, Takashi INOUE, Daisuke SAITO
Article type: Article
Session ID: B-25
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Data of BEMS and added measurement points was analyzed to explain actual mechanism of the heat loss on DHC. Also present state on countermeasures for the heat loss was investigated to understand the business routine. As a result, it was shown as followings. 1) JIS equation is generally used for to decide the thickness of the insulation. However, this equation does not use for calculation of the heat loss. 2) The temperature in the trench is not enough to explain the fluctuation of the heat loss. 3) There is a possibility that the fluctuation of the flow volume affects the temperature of customer inlets.
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Masashi MOMOTA, Kenichiro WATANABE, Takashi INOUE, Daisuke SAITO
Article type: Article
Session ID: B-26
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Focusing the transportation heat loss of DHC, comparison between actual condition and calculated value was studied to explain actual mechanism of the heat loss. As a result, it was shown followings. 1) Fluctuation of the flow volume affects the temperature of customer inlets. 2) Trend of the calculation result matches the actual condition. 3) However, value of the calculation did not match the actual value. 4) Enhancement of system load factor has a possibility of the heat loss reduction. 5) Method of the measurement on the heat loss should be reconfirmed.
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Tomoaki KOBAYAKAWA, Gakuichirou OHMURA, Shinta TANABE, Eiji HARA, Yuki ...
Article type: Article
Session ID: B-27
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In this paper, first, in order to promote use of the heat source water in buildings in a city, the concept and types of the heat source water network were proposed as a new city infrastructure. And the system model for verifying the introductory effect of a type which raises environmental addition good worth of the supply infrastructure of resurgentwater, and enables compound maintenance with sewerage was shown.
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Tomoaki KOBAYAKAWA, Gakuichirou OHMURA, Shinta TANABE, Eiji HARA, Yuki ...
Article type: Article
Session ID: B-28
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In this paper, the introductory effect of an independent use type and an area network use type in the heat source water network which is a sewerage compound maintenance type was verified. As a result, in the former, the improvement effect of energy efficiency was 0.15, and the energy-saving effect was 10%. And in the latter, the improvement effect of energy efficiency was 0.2, and the energy-saving effect was 13%.
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Yifan ZHAO, Noriyoshi YOKOO, Tatsuo OKA
Article type: Article
Session ID: B-29
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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This study is to explore and analyze the system efficiency and pipe network heating loss of district heating plant of Shenyang, China. The study did actual measurement survey on heating supply of Shenyang's Wulihe plant from 2007 to 2008. The study is to survey the steam and heating water according to their differences in medium, and it also introduces the calculation method of pipe network heating loss in theory. Due to the fact that medium temperature in steam is higher than in water, so it has higher heat losses than heating water. The efficiency of a heat exchange in heating plant is 95% and the efficiency of a boiler is 74.8%. Fuel expense is the largest expense in terms of systematic operation cost, averaging 64%. Look into the future, if every house hold installs a valve to adjust temperature, not only it can help people to save energy but also to decrease any heating losses from unbalanced heating.
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Atsushi SHIGETA, SUNGJUN Park, Kazuhiro YUASA
Article type: Article
Session ID: B-30
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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All this time, Introduction of District Heating and Cooling system (DHC) has been promoted though the standpoint of the air pollution-prevention and the Energy Conservation based on advantage of scale. But in theses days, efficiency of low-capacity heat source system (Individual System) is improving. Therefore, it is necessary to review the energy conservation of DHC. This study is aimed to verity the conditons of Energy Conservation of DHC. In this study, the conditions of DHC for the energy conservation were recalcurated, considering the parameters related to the energy consumption of DHC Pipe System and the heat loss from DHC Pipe System. The load equalization and the load characteristic of the DHC were also considered. As a result, it was cleared that the length of DHC Pipe System is most effective in the parameters, and DHC cannot conserve the energy consumption with the highest load equalization in some case.
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Yusuke MORI, Harunori YOSHIDA, Fulin WANG, Eikichi ONO, Hironobu TSUJI ...
Article type: Article
Session ID: B-31
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In order to improve the energy performance of a district heating and cooling (DHC) plant, the expected performance of the plant is studied using simulations based on mathematical models. An complete heat source system model, equipped with an embedded module that automatically determines the on/off states of heat source equipment using cooling/heating loads, has been developed and validated using actual performance measurements. The mean error between the simulated and measured total energy consumption was 4.2%. Using the developed model, two studies, performance verification of high efficiency chillers and improving pipe resistance, are conducted and the latter can reduce the power consumption of three pumps by 24%.
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Eikichi ONO, Harunori YOSHIDA, Fulin WANG, Yusuke MORI, Hironobu TSUJI ...
Article type: Article
Session ID: B-32
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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In order to improve the energy performance of a district heating and cooling (DHC) plant, the expected performance of the plant is studied using simulations based on mathematical models. An complete heat source system model, equipped with an embedded module that automatically determines the on/off states of heat source equipment using cooling/heating loads, has been developed and validated using actual performance measurements. The mean error between the simulated and measured total energy consumption was 4.2%. Using the developed model, four studies for improving the plant operation are simulated in order to determine how much energy can be saved. If all of four proposals are applied, the total power consumption and energy cost can be reduced by 11.0% and 8.2% respectively.
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Tsuyoshi FUNATO, Yoshinori KAIGUCHI, Eichi KUROMOTO, Kunihiko IWABUCHI ...
Article type: Article
Session ID: B-33
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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As part of the electric power load equalization in the resort hotel (the architectural area of 12,055m2, the 87 numbers of guest rooms), and energy-saving activities, we carried out employment improvement of a temperature-stratified thermal storage tank, and improvement construction for the purpose of reducing stopping the chilling units in a peak cut time zone (13:00 to 16:00), and electric power demand by 150kW.
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Hiroaki KITANO, Takeshi IWATA, Shigehiro ICHINOSE, Kazunobu SAGARA, Yu ...
Article type: Article
Session ID: B-34
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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Connecting holes arrangement and inflow velocity at the connecting hole have great effects on storage density of thermal energy storage tank of multi-connected mixing type. In this report, a mixing model is presented. It is considered that the dead water zone in the storage tank is reduced with time in the model. And the vertical temperature profiles in each tank calculated by using the mixing model were compared with experimental results and measurement results of actual thermal energy storage tank. It was found that the calculated results by using the mixing model agreed with the measurement results.
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Michinori KUBOTA, Kazunobu SAGARA, Toshio YAMANAKA, Hisashi KOTANI, Yo ...
Article type: Article
Session ID: B-35
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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It is difficult to evaluate the performance of air-conditioning systems with thermal energy storage tanks, and there are many systems never checked whether they realize the expected performance or not. The objective of this study is to estimate the performance of water thermal energy storage tank of multi-connected complete mixing type. In this paper, CFD analysis was conducted to figure out the detail of tank condition, and measured data were replaced with generated data by CFD analysis. The new detection method considering time change of dead water zone was applied to the generated data, and dead water zone was detected.
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Takafumi NISHII, Tadahiko IBAMOTO, Masashi MOMOTA, Yuuki NAGUMO, Hajim ...
Article type: Article
Session ID: B-36
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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Focusing a transportation energy reduction of ice storage system, we had proposed the system which has the vertical ice storage tank. On this paper, to avoid a technical problem on the practical use phase, the approach of the ice filling was examined. And latest technical knowledge was concluded. As a result, it was shown that this system is able to construct with latest achievements.
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Yuuki NAGUMO, Tadahiko IBAMOTO, Masashi MOMOTA, TAKAFUMI Nishii, Hajim ...
Article type: Article
Session ID: B-37
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Focusing a transportation energy reduction of the ice storage system, we had proposed the system which has the vertical ice storage tank. On this paper, regarding previous paper, distributor which provides return water into the top of the tank was improved to enhance the efficiency of the direct heat exchange between water and cube ice. Through this study, it was shown that distributor should provide return water slowly and widely, and that suggested distributor shape was able to use for practical use.
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Takahiro OGAWA, Ikuhiro YAMADA, Fumio KIMURA
Article type: Article
Session ID: B-38
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In the previous articles, we reported the experiment results of the discharging characteristic on the dynamic-type ice storage system which have the upward blow-out nozzles in the lower part of the water tank. We present experimental results of the discharging characteristic on the downward blow-out nozzle in the upper part of the water tank and compare with the discharging characteristic on the upward blow-out nozzles. The average outlet water temperature with the downward blow-out nozzle is higher than the predicted value by the model, and when the inlet water velocity is fast its difference is big. This difference is smaller when we increase the nozzle number.
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Hikalu KOBAYASHI, Kentaro SEKINE, Hirokazu YONEDA, Yasushi TOMIYAMA
Article type: Article
Session ID: B-39
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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We have developed two pipe dynamic ice transportation system for building HVAC system. The system can transport over 10% of ice packing factor slurry, and we already applied it to two office buildings. In this report, we outline characteristics of the system and the results of some basic experiments on ice slurry transportation. We also show the buildings' HVAC system using ice slurry.
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Takuji NAKAMURA, Michiya SUZUKI, Keita MATSUSITA, Toshiaki MATSUOKA, K ...
Article type: Article
Session ID: B-40
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The small scale experiment of building thermal mass storage system based on floor-supply displacement ventilation system with phase change material is carried out in real building. The purpose of experiment is to make clear the efficiency of load balancing using new shape PCM. The results show that the peak-cut ratio from thirteen to fourteen o'clock is 100 % under the room temperature condition at 27℃ and 28℃. There is a relation between the set room temperature and phase change temperature.
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Noriyoshi YOKOO, Kannan SOU, Tatsuo OKA, Shyunsuke KAIDO
Article type: Article
Session ID: B-41
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In this research, we arranged a system that can increase the storage of heat by putting heat transferring pipe into the concrete and sticking Phase shift materials on it. The refrigerative water is poured into the heat transferring pipe. So that the change of temperature of the Phase shift materials can be used to be calculated the storage of heat.
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Hisataka KITORA, Katsunori NAGANO, Sayaka KINDAICHI, Takuji NAKAMURA, ...
Article type: Article
Session ID: B-42
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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This paper is examined about the building thermal mass storage system based on under-floor air distribution system with granulated phase change material by computer simulation. The purpose of simulation is to make clear the operation condition for peak cut of cooling energy. The results show the preservative method for thermal charge of PCM in morning and the rate of air circulation to the room in night for effective charge to PCM.
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Yoko KUMATA, Masashi YAMAGIWA, Kazunobu SAGARA, Toshio YAMANAKA, Hisas ...
Article type: Article
Session ID: B-43
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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In a building thermal energy storage by outdoor air, structure and furniture are cooled by outdoor air. through air handling unit and openings for natural ventilation. In the daytime, the stored heat reduces cooling load by cooling the return air. The purpose of this study is to estimate the actual condition of this system and lead to optimized operation for energy conservation. This paper presents the measurment results of building thermal energy storage by outdoor air and results of operation method study using simulation model.
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Yuka ASANO, Kazunobu SAGARA, Toshio YAMANAKA, Hisashi KOTANI, Yoshihis ...
Article type: Article
Session ID: B-44
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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In building thermal energy storage system, the building structure, furniture and papers are used as the heat storage materials. However, it is difficult to know the actual condition of the thermal energy storage system. The aim of this study is to establish a calculation model to predict the actual condition of the system. This paper presents the experimental results of measured internal temperature and surface heat flux of the book and papers which have large thermal capacity. In addition, the mathematical models to estimate the surface heat flux are also shown.
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Hisayoshi MATSUFUJI, Takami KOSEKI, Tetsuji JOZUKA, Kazuaki IIJIMA, Ha ...
Article type: Article
Session ID: B-45
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The thermal storage system using metal hydride driven by the utilization of waste heat of the municipal incinerator is investigated for air-conditioning of buildings. This system is useful for the global environment because of using the waste heat as an energy source in place of electrical power and using hydrogen as a refrigerant in place of fluoro-carbon. The waste heat is recovered from the incinerator and stored in the storage material which is loaded in the tank on the truck and transported between the municipal incinerator and the buildings. New system is proposed.
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Takami KOSEKI, Hisayoshi MATSUFUJI, Tetsuji JOZUKA, Kazuaki IIJIMA, Ha ...
Article type: Article
Session ID: B-46
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The thermal storage system using metal hydride driven by the utilization of waste heat of the municipal incinerator is investigated for air-conditioning of buildings. The waste heat is recovered from the incinerator and stored in the storage material which is loaded in the tank on the truck and transported between the municipal incinerators and the buildings. As the experimental results of the heat storage process for nighttime, the waste heat is recovered from the incinerator about 3 hours, and supplied to the metal hydride about 7 hours after one hour's transportation.
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Yuichiro AMANO, Masanobu AONO, Yoshiyuki NAGURA
Article type: Article
Session ID: C-19
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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It is important for the method of leveling the electric power load to use the midnight electric power like the thermal storage system. This building in Tokushima Pref. adopts method of the electric power load leveling such as the building thermal storage system with general purpose air-conditioning equipment, in addition to the ice thermal storage system. In this study, we report the outline of the building and measurement result in summer 2008. Additionally, making and the case result of review of the simulation model.
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Katsuhiro MIURA
Article type: Article
Session ID: C-20
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Thermal mass storage system is mainly applied to cooling in Japan. Many field studies have been done in summer but few for intermediate season. A field study was done in an ofce building in Tokyo and the relationships between slab temperature and outdoor temperature and between slab temperature and stored thermal energy were analyzed through it. The variation in slab temperature by outdoor temperature is small and the decrease of the stored energy from summer to intermediate period is estimated about 10%.
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Satoshi MIYAGI, Yoshiyuki KAMIYA
Article type: Article
Session ID: C-21
Published: August 18, 2009
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 mixed phase change material above the slab in previous papers. In this study, the temperature distributions of jellied thermal storage body mixed phase change material calculated using heat generation model were consistent with the results of the experiments. In addition, charging and discharging characteristics of jellied thermal storage body mixed phase change material were grasped by simulation.
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Yusuke SATO, Noriyasu SAGARA, Yuji RYU, Katsuki Maehara, Tatsuo Nagai
Article type: Article
Session ID: C-22
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The purpose of this study on building structure thermal storage HVAC system is to develop a new algorithm which can choose night time operation hour, nighttime supply air volume and temperature to prevent excess cooling in night time that causes the low room temperature at the cooling starting time in day time, especially during low load period such as June and September. As a result, using this algorithm, the number of days when the room temperature fell less than 24 degree C as set-point temperature decreased compared with that in the ordinary nighttime heat charge operation (constant supply air volume, constant supply air temperature and constant operation hours). In the cooling period, the cooling loads were reduced by 20 %, compared with those in case of non-thermal storage HVAC system.
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Kyoko SHUKU
Article type: Article
Session ID: C-23
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The number of the home-use central air-conditioning systems has increased recently as highly insulated and highly airtight house has been spreading. This ongoing project measures the operational condition of the air-conditioning systems, indoor thermal environments and energy consumed etc. in five households (four central air-conditioning system users and one individual air-conditioner user) around Nagoya city. The second paper is reporting on the measurement results of 2007-2008.
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Shoichi NAKAI, Takahiro KUMAO, Yoriyuki TORIGOE
Article type: Article
Session ID: C-24
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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Spot air-conditioning is performed as anti-heat measure of the workers in a machine factory. However, it is the fact that the temperature of the current of air is the same as ambient temperature by the spot air conditioning, and a feeling of cold wind is not provided. In this paper, we examined the spot air-conditioning system with minute fog aimed at getting effective chilling effect. As a result of we evaluated a temperature fall effect and comfort of the work area, and having carried out questionary survey, we concluded that this system was effective for anti-summer heat measure.
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Takahiro KUMAO, Shoichi NAKAI, Yoriyuki TORIGOE
Article type: Article
Session ID: C-25
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In this study, we examine the effectiveness of the spot air-conditioning system with minute fog. In the first report, the cooling effect was examined by the experiment. In this report, the thermal and the air environment are examined by the CFD analysis based on the results of experiment. The results of the experiment and the CFD analysis was roughly corresponding. Thus, it was shown to examine it by the CFD analysis. Temperature and absolute humidity distribution, etc. were able to be understood in detail according to the analytical result. We think that we can decide the design condition by the CFD analysis.
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Kazumi SAWADA, Mika SAGAWA, Syohei YOKOTA, Naomi MOTOYAMA
Article type: Article
Session ID: C-26
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The objectives of this study were to development of the closedown type plant production facility (CPPF) for recombination soybean cultivation and high-efficiency cultivation techniques. In this study, the CPPF was built and environment performance (air temperature, humidity, wind velocity, light condition) of the grow room in the CPPF were measured. In addition, changes in air temperature within soybeans community were investigated. These results showed that effect of transpiration rate of soybeans on air temperature within community.
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Kazuki NAKANO, Masakazu HASEGAWA, Masutaro MIZUTANI, Tetsuyuki NOMURA, ...
Article type: Article
Session ID: C-27
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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In order to reduce a huge steam and energy consumption for air conditioning loads, we developed a water spray humidification system that introduced water atomization humidifying into the return air duct of air-conditioning system, where the steam humidification had been installed. In this paper, we report the aim, feature, control performance and effects of steam and energy conservation. Additionally a case where the system was introduced is described. As a result, the room temperature and the humidity were steady, and the amount of humidifying steam decreased up to 28%.
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Naoki KENMOTSU, Tadahiko IBAMOTO, Taichi ISHIKAWA, Yoshikazu HAZAMA, A ...
Article type: Article
Session ID: C-28
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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We developed combined fluctuating breeze system with cold air distribution system by ice thermal storage. We have them given cool effect by exposure airflow to human body activity by cold air distribution system with fluctuating breeze under the environment of low humidity. So, it is possible to provide energy saving and comfortable environment to set up indoor temperature highly. We report the result of the field test of three years, and introduced diffuser for this system on this report.
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Hirokazu MATSUMOTO, Tadahiko IBAMOTO, Taichi ISHIKAWA, Yoshikazu HAZAM ...
Article type: Article
Session ID: C-29
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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We developed thermal sensitivity control sensor `Tf α sensor' for cold air distribution system with fluctuating breeze and examined. On this paper, for the practical application, a sensor and a control part was integrated to shrink the size of this sensor. And characteristic of an isothermal environment and a non-isothermal environment was confirmed. As a result, we grasped advancement of temperature control and the characteristic of this sensor.
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Noriaki SATO, Kenichi YASUDA, Hidetaka SEKINE
Article type: Article
Session ID: C-30
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In previous papers we reported the VAV system to guarantee the out door air volume of each zones to solve the problems of the uneven OA volume, the restriction of the control range and that effect of the energy consumption. And we reported the measured improvement effect on the indoor air quality by 20% of the system and the effect of the energy saving 200MJ/m^2 ・year. In this paper we report the analysis of the measured improvement effect of the system at the other building 'MI building'. We measured the effect of the energy saving over 62% from the existing. VAV systems.
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Hiroshi KAJII, Hirofumi IDA, Ryoichi SAKURAI, Mariko MITSUMORI
Article type: Article
Session ID: C-31
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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This paper shows results of the simulation for evaluation of heat release from thermal storage RC floor slab. It develops that the distance between pipe and top of slab, thickness of slab and temperature of heated water have influence for heat release from slab. Moreover, floor composed by bridging joist turned out to be not suitable for this heating system because of preventing slab from releasing heat.
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Shintaro ANDO, Yasuyuki SHIRAISHI, Yuji RYU, Noriyasu SAGARA
Article type: Article
Session ID: C-32
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The preliminary experiment of cooling in summer was conducted for a detached house in the city of Kitakyushu, in order to clarify the indoor thermal environment and energy consumption of the house which installed the air heating and cooling system through under floor based on insulating foundation. Since it is easy to produce indoor vertical difference of air temperature for cooling, the control technique which fixes air volume and controls air temperature at inlet is suitable for this system. It is also possible to keep indoor thermal environment comfort and uniform by conducting same control.
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Hisao SEKE, Akira YOSHIDA, Toshiharu NAGAMORI, KIikuchi YOSHIHISA, Mas ...
Article type: Article
Session ID: C-33
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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There are no adequate floor air diffuser which can meet the critical thermal requirement to be installed underneath seats of amphitheater with steps. The purpose of this study is to find such geometry. The authors have investigated the air velocity distribution around a seat with several newly developed floor diffuser samples with different geometries and confirm the suitable one which can be used in amphitheater.
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Takashi KUBO, Shohei MORIMOTO, Akira KATO, Sayaka SUGANO, Masashi KURA ...
Article type: Article
Session ID: C-34
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The purpose of this research is to investigate the effects of the floor heating system on human health. We adopted a hot water floor heating system and an air conditioning system. The air temperature was kept at the same level of 21 ℃ under the both systems. The floor temperature of the floor heating and the air conditioning system was controlled at 26 and 21 ℃, respectively. The results of multi physiological and psychological components showed the warming effects of floor heating on a lot of body temperatures, blood flow rate, muscle function and sensation votes.
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Sookyung KIM, Sayaka KINDAICHI, Makoto SATO, Yosihiko AKAMINE, Ryohei ...
Article type: Article
Session ID: C-35
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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In this paper, basic characteristics of the Phase Change Material (PCM) into floor-heating panel which was designed to store solar radiation were investigated. We determine a large quantity of heat storage was possible by using PCM, through comparison with the water. In addition, we confirmed the differences of quantity of floor gain heat with solar radiation by floor surface materials. We define the heat balance on floor surface; short wave of solar radiation is the most contributory element on floor gain heat.
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Hiroyuki KUBO, Kazuyuki KOBAYASHI, Kayako HAMANAKA, Tomohiro MIZUTANI, ...
Article type: Article
Session ID: C-36
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Floor Heating System with Heat Pump brings highly effective work by positive use of water in low temperature. This result shows that the use of highly effective panel for floor heating system gives high amenity in using water less than 40℃ and that the cop of it can be more than 3.0.
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Yoshiaki KAWAKAMI, Shuichi ISHII, Masato OGAWA, Masashi NISHIMURA
Article type: Article
Session ID: C-37
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Sub-cooling system was introduced into IKEDA office of RICOH Co., Ltd. for an energy-saving technology of multiple packaged air conditioning units for buildings (PAC for buildings). This is the first case that Sub-cooling system using well water is applied to a whole building for air conditioning, so we verified the advanced performance of this system during one season. As a result, it was confirmed that the electric power consumption for air conditioning during one season was decreased by 9.8%, as compared with conventional system. And Sub-cooling system was able to reduce the peak of electric power consumption for air conditioning by 23.6%.
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Hokuto NAKAMURA, Kotaro TANAKA, Tatsuo NOBE
Article type: Article
Session ID: C-38
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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This study is about Probe Insertion Method for On-site Evaluation of VRF System at cold regions. The purpose is to make clear actual VRF system by probe insertion method. Previously reports show how Probe Insertion Method is built up and works. This time, authors measured outdoor unit of GHP which has been already installed in an office building. A period is from summer to winter to see both the cooling and the heating. According to On-site evaluation, authors found that there are some characteristic in cold regions.
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Atsushi Yokoyama, Tatsuo Nobe
Article type: Article
Session ID: C-39
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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This study is an evaluation of indoor thermal environment Conditioned by VRF. In late years, studies of VRF are increased such as evaluation of performance and energy performance. However there have been very few studies documenting about the indoor thermal environment by VRF. Therefore more information about that is needed. This report shows the result about thermal environment by field measurement of 20 rooms measured during one year
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Hiromasa TANAKA, Susumu HORIKAWA, Kazunobu SAGARA, Yoshihisa MOMOI, Ka ...
Article type: Article
Session ID: C-40
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Packaged air conditioners are commonly used in small or medium buildings. They are handy and can be easily adopted but it can be said that energy conservation technique in using those air conditioners has not been thoroughly examined yet. It is essential to establish an energy conservation technique with the packaged air conditioners for small or medium-sized buildings. As a first step of this endeavor, the authors made investigation on the existing small or medium buildings to grasp their air conditioning systems and to see if there is any problem in air conditioning in those buildings.
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Takuya WAKAHARA, Takayuki KISHI, Yuta KATO, Shigeki KAMETANI
Article type: Article
Session ID: C-41
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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This paper describes the performance evaluation method of a split air conditioning system based on characteristic curve of the compressor mass flow rate. The Gas Engine Heat Pump system installed on the office building in Asahikawa, and investigated the operation characteristics in the cold district of winter. As a result of the measurement, the operation characteristics of the GHP are clarified, and the error factor of this evaluation method is examined.
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Koji NAGASAWA, Yoshihiro NAKAGAWA
Article type: Article
Session ID: C-42
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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This study aims at the efficiency improvement of multi-split type air-conditioning system. This paper shows an energy-saving effect by the evaporation temperature control in an actual building. The evaporation temperature control is effective for the COP improvement of vapor compression refrigeration cycle. The evaporation temperature control can reduce consumption energy of multi-split type air-conditioning system in an actual building.
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Yuji OZAKI, Teruyuki SAITO, Kana MIZUTANI
Article type: Article
Session ID: C-43
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In this paper, we show the results of field survey about the fresh air introduction in office space adopted with multi-sprit type air-conditioning system. The results showed the trend that the total heat exchanger inhaled the supply air from indoor units in the heating period. They also showed the number of days that daily-averaged indoor CO_2 density exceeded 1,000ppm was increased according to outside temperature in the cooling period, and the number was more than that of the heating period. Therefore, there is the possibility that ventilation is not performed well in the cooling period.
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