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Masanobu HINOHARA, Naoyuki IMAWAKA, Nobuki Ito, Hiroyuki MAEKAWA
Article type: Article
Session ID: C-4
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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This paper describes experiments of the temperature control of Direct Expansion system (DX-system) for constant temperature and humidity test facilities. A traditional DX-system uses evaporative pressure regulator (EPR) ,which has poor load following performance, to maintain minimum evaporative pressure. A motor operated two-way control valve is used in our control method. This method can achieve high control precision compared to the traditional method.
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Tadayoshi SAITO, Eichi KUROMOTO, Kunihiko IWABUCHI, Yasuhide OKAMOTO, ...
Article type: Article
Session ID: C-5
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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It is essential to keep the differential temperature of chilled water for saving energy of HVAC systems. This paper shows the experimental results about the fluctuation of the differential temperature of the chilled water in air handling unit.
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Junichi SHIMODA, Masato YAMAZAKI, Shigeki KAMETANI
Article type: Article
Session ID: C-6
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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We conducted measurement of Multi-type Air-conditioner installed at real buildings for a year and analyze the characteristics. We obtained the findings as follows:I )We obtained the characteristics of air-conditioning load from the relation of outdoor air temperature and hourly heat output,2) COP of outdoor equipment achieve at the point from 30% to 50% in load factor. Based on the above the findings, we proposed, I )To adjusting the preset temperature condition at the start of operation, 2)To Monitor air-conditioning load and control heat output of air-conditioner, 3)To install the air-conditioner with the capacity proper for most frequent air-conditioning load.
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Naoya MATSUKI, Ryoichi KAJIYA, Koji SAKAI, Ryutaro KUBO, Toshihiko SUD ...
Article type: Article
Session ID: C-7
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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The floor supply displacement air conditioning system makes the uniformly temperature and air flow distribution in the occupied zone. And the perimeter-less system can reduce heat load of perimeter zone. In this report, about the effect that the perimeter-less air conditioning system reduced the perimeter heat load in the summer and the winter season, discussed by the CFD analysis.
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Hiroshi HASHIMOTO, Junji MURA
Article type: Article
Session ID: C-8
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Indoor thermal environment measurements were conducted to proof the cooling performance of displace-ment air-conditioning system being applied at an urban city auditorium in central Osaka as a part of commissioning work. The system comprise of three air-handling units dedicatedly controlled for the stage, 1st and 2nd floor seating areas respectively. The air outlets of displacement in the seating area were mainly located underneath the seats, and the controlled air is discharged via. plenum chamber located at under-neath the floor. It was confirmed that the performance is virtually accepted and as per designated in the original design.
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Keigo YAMANAKA, Hirofumi HAYAMA, Koki KIKUTA, Masamichi ENAI, Akira FU ...
Article type: Article
Session ID: C-9
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In the factory with the high heat density, energy for air-conditioning is consumed a lot, and its reduction is an issue in the future. It will be predictably effective that they bring in outdoor air cooling with cool air in snowy cold region, and in displacement ventilation system which effectively exaust heat and air contaminant from metal cutting machine tool. In this study, we make a survey of indoor thermal environment and coefficient of heat loss in real-life buildings.
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Junya YAMADA, Toshio YAMANAKA, Kazunobu SAGARA, Hisashi KOTANI, Yoshih ...
Article type: Article
Session ID: C-10
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In this study, we propose to use the displacement ventilation as a means of obtaining high indoor air quality, in combination with radiant panel for individual control of thermal environment for sickroom. In the previous study, temperature distribution and contaminant concentration profile inside insulated displacement-ventilated room with radiant panel are investigated. However it is predicted that convective flows along the window have much influence on the temperature distribution and contaminant concentration profile in the actual sickroom. This paper shows experimental results and validation of calculation model to examine the effect of airflow along the window.
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NARAE CHOI, Toshio YAMANAKA, Kazunobu SAGARA, Hisashi KOTANI, Yoshihis ...
Article type: Article
Session ID: C-11
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In this study, we propose to use the displacement ventilation as a means of obtaining high indoor air quality, in combination with radiation panel for individual control of thermal environment. And the propose of the study is intended to examine the validity of this system. In the previous study, it is confinned that contaminant interface is formed in the mom with this system. However, it is not located over the heads of a standing person and it is not sure that standng person breathes flesh air. Therefore personal exposure of standing person is examined and calculated by personal exposure model. This paper shows the experimental results and calculated results.
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Tomoaki USHIO, Shingo TANABE, Noriaki MISHIMA, Kazunobu SAGARA, Toshio ...
Article type: Article
Session ID: C-12
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Equipment heat load in design phase is inevitably bigger than an actual one to contain a margin. Cutting air volume to meet the actual heat load makes fan energy consumption small. Then lowing supply air temperature can remove high humidity in summer. The impact of tuning air volume was studied by three steps. 1. Energy consumption was calculated employing energy simulation. 2. Thermal distribution and air speed distribution was investigated using CFD. 3. Thermal environment in an office was measured. Cutting air volume results in the decrease of energy consumption by 16.1% and brings better thermal environment than the original.
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Shinji NAKAMURA, Takashi AKIMOTO, Satoshi HASHIMOTO, Atsushi NISHINO, ...
Article type: Article
Session ID: C-13
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Currently, from the perspective of global environment protection, there is a demand for energy conservation in office buildings. On the other hand, from the perspective of improving productivity, there is a demand for improved thermal conditions that provide comfort for individuals. Subjective experiments were conducted using a TC system, to investigate factors such as temporal variations, knowledge of changing factors, and the effects on the control function of thermal comfort.
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Norio KITO, Ryoichi KUWAHARA, Masaki SHIOYA, Yoshiaki YAMADA
Article type: Article
Session ID: C-14
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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We aimed at the construction of the type air conditioning system for the person staying in the room, and experimented on the testee in heating. As a result, the thermal sensation of a specific part was admitted to be improved by the task air-conditioning means. However, it was clarified that it gave birth to the appearance ofthe part that newly required improving to the improvement of the thermal sensation in the specific portion.
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Atsushi KASUYA, Kazuki WADA, Masaaki HIGUCHI, Mikio TAKAHASHI, Kousuke ...
Article type: Article
Session ID: C-15
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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This study is aimed at grasping a characteristic of thermal environment and the energy-saving effect about the air-conditioning system used convection and radiant cooling and heating. This report shows thermal environment assessment and personal air current by fundamental study which parameter about radiation panel temperature, the wind velocity and temperature of a personal diffuser unit.
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Hiromi NUMATA, Shigeru OKAMOTO, Hisataka KITORA, Hiromasa YAMAGUCHI, S ...
Article type: Article
Session ID: C-16
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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As circulation water temperatures of ceiling radiant cooling/heating systems are higher for cooling and lower for heating, COP of HP is higher than conventional air conditioning system. This report demonstrates the performance of energy saving by showing the electricity consumption of HP, pumps and fans with energy simulation based on the experimental results. Energy consumption of radiant systems are 39-49% lower compared with conventional air system and radiant system with ice storage is 29% lower.
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Hideki KIKUMOTO, Ryozo OOKA, Yujin NAM, Minki SUNG, Doosam Song
Article type: Article
Session ID: C-17
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Recently, hybrid air-conditioning systems have been proposed and applied to achieve building energy savings. One example is a system combining radiation panels with natural wind-induced cross-ventilation. However, few research works have been conducted on the non-uniformity of thermal comfort in such hybrid air-conditioning systems. In this paper, non-uniform thermal comfort of various air-conditioning systems, including hybrid systems, was evaluated in a typical office room using coupled simulation of computational fluid dynamics, radiation model and a human thermal model. The non-uniformity of thermal comfort was evaluated from the deviation of predicted mean vote of human thermal model.
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Akinori HOSOI
Article type: Article
Session ID: C-18
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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This paper describes thermal environment and energy consumption of a Heating/Cooling radiator. We compared a radiation system and a building multi package in a small office space. It is said that distribution of thermal environment with the radiator ,SET^* for example, is smaller than building multi package, and also said that radiation system can reduce energy consumption from about 10% to 20%. However, we showed radiator tend to form vertical air temperature layer, and estimated energy conservation effect of radiation system to be 8% in heating under actual usage. If the wind velocity was not increased, the energy conservation wasn't able to be achieved in cooling.
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Sayaka MURATA, Akira FUKUSHIMA
Article type: Article
Session ID: D-1
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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The exhaust only ventilator has a problem of the cold down draft from the vent opening. The vent opening with a unique baffle-plate, the top of which incline to the room, might be able to make the influence of the cold down draft less. In this paper, we examined how the cold down draft from that peculiar vent opening should influence indoor air climate. As the result, we showed that the indoor air temperature wasn't different between the shapes of the vent openings, while that peculiar vent opening can keep the surface temperature of the wall around it higher than the other.
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Yusuke MINAMI, Haruo HANIBUCHI
Article type: Article
Session ID: D-2
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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This paper focused investigation assumed a urban model apartment with gentle pitch and examined sun shading of the roof and the influence that ventilation layer gave indoor environment. With the focuses from considered the thermal influence that sunshade, ventilation layer, difference of the ventilation layer type.
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Mitsutoshi FUJIKAWA, Hiroshi YOSHINO, Rie TAKAKI, Hiroyasu OKUYAMA, Mo ...
Article type: Article
Session ID: D-3
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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An experiment for ventilation was carried out in a full-scale test house. This series of studies aims to examine the ventilation measurement method via human expiration. The adopted method is able to measure multi-zone airflow rates. Airflow rate between rooms was controlled and outdoor airflow rate was measured with the test house. The rate of outdoor airflow entering the house and the airflow rate between the rooms were estimated by the ventilation measurement method via artificially provided CO_2 as simulated human expiration based on system identification theory. The estimated results were compared with the measurement results in order to validate its accuracy.
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Masaki TAJIMA, Jun-ichiro MATSUNAGA
Article type: Article
Session ID: D-4
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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A continuous measurement in a house employs demand controlled ventilation system, whose terminal devises change its opening area by sensing relative humidity of internal area, was executed in an inhabited condition. Temperature, relative humidity, carbon dioxide concentration, air flow rate & power input of ventilation system and so on were obtained. Measured results show air flow rate of ventilation system is changed by relative humidity proportionally, operating specific fan power is smaller than reference value of Energy Saving Code of Japan, and formaldehyde concentration is low enough even when air flow rate was lessened in winter.
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Hiroaki SAITO, Shigeki NISHIZAWA, Yasuo KUWASAWA, Takao SAWACHI
Article type: Article
Session ID: D-5
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Several researches related to airflow within wood-frame wall assemblies have been conducted in order to assess their hygrothermal behavior. However there are very few reports which investigate boundary conditions such as pressure difference and/or leakage area to predict the airflow rate. This paper describes the pressure difference that causes the airflow for vertical direction within the wall assembly. The pressure difference between the crawl space and the attic on an actual wood frame house were measured in the winter season. Additionally effects of several factors, such as air-tightness of connections of the wall, outdoor wind velocity, and temperature difference between indoor and outdoor air, were experimentally investigated. The experimental results finally indicated that the pressure difference can be approximately predicted using the temperature difference between indoor and outdoor air when outdoor wind velocity is less than 1.5m/s.
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Shigeki ONISHI, Masaki TAJIMA, Satoru MINENO, Sayaka MURATA, Takao SAW ...
Article type: Article
Session ID: D-6
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In order to evaluate in situ performance of energy recovery ventilation system in an experimental apartment house, which employs not only heating systems but also simulated human behaviors and household electrical appliances, has been operated. The experimental result shows relationship between internal-external temperature difference and heat recovery efficiency and reduction of ventilation load which can be reduced by approximately 70% during most cold period in Tsukuba city.
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Yoshihiro TORIUMI, Takashi KURABUCHI, Kazunori HOSONO, Sadanori KODERA
Article type: Article
Session ID: D-7
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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This study investigates the thermal comfort and ventilation performance of retrofitted apartment houses. Effect of retrofitting windows was studied regarding thermal comfort and ventilation performance through measurement before and after retrofitting apartment houses built in some 40 years ago. In the present study, high airtight apartment house with mechanical ventilation equipments in recent years was measured, and it compared with previous measurement results. Compared with these retrofitted apartment houses, high airtight and ventilation rate was stable. It was confirmed that mechanical ventilation equipment is essential in keeping required ventilation rate in high airtight apartment houses.
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Toru FUJIMOTO, Hisashi KOTANI, Kazunobu SAGARA, Toshio YAMANAKA, Yoshi ...
Article type: Article
Session ID: D-8
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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The building introduced natural ventilation system is increasing for the purpose of saving energy effect. The chimney is one of the natural ventilation system. Natural ventilation is influenced by outdoor wind velociy, direction, temperature and opening window situation. The purpose of this study is to figure out the ventilation rate in the school building with chimney. This paper shows the results of field measurement and predicting air flow route in mulizone network model.
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Natsuka WAKAMATSU, Hisashi KOTANI, Kazunobu SAGARA, Toshio YAMANAKA, Y ...
Article type: Article
Session ID: D-9
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Recently, energy saving and natural energy use attract attention behind environmental concern,and building installed with natural ventilation system is increasing. The purpose of this study is to investigate the actual condition of indoor environment in school building with natural ventilation system, and to figure out the actual condition of utilization for natural ventilation and occupants' attitude. This paper shows the results of field measurements regarding indoor thermal environment and questionnaire surveys in winter. Questionnaire results in winter are compared with that in fall which was reported in the previous paper.
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Naomichi NISHIMOTO, Toshio YAMANAKA, Kazunobu SAGARA, Hisashi KOTANI, ...
Article type: Article
Session ID: D-10
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In spring and autumn, the natural ventilation is effective in not only the ventilation but also the thermal environment control. However, it is difficult to maintain the indoor thermal comfort when the enthalpy of the outdoor air is higher than that of the indoor air. Then, the hybrid air-conditioning, which is the combination use of the natural ventilation and the air conditioning, is available too. The purpose of this study is to reveal the indoor thermal environment by the natural ventilation and the hybrid air-conditioning. In this paper, the results of the measurement in the actual building in last autumn and the results of the CFD simulation are shown.
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Keihou KAINOU, Satoru TAKADA, Tomoaki USHIO, Takayuki MATSUSHITA
Article type: Article
Session ID: D-11
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Making an opening in elevator shaft as a method for the prevention of the stack effect in high-rise building in winter, which was already shown effective for a model building with a simple plan, is studied for a more complex building model; with three elevator shafts including a connection from lower to higher part of the building, with different air leakage characteristics and different number of elevator door for every floor, and with a large stairwell. Based on the airflow network model, the influence of the opening of the doors in the entrance on the characteristics of the ventilation of the whole buildings is described and it is shown that the proposed method is also valid for this case.
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Shunsuke UMEMURA, Susumu HORIKAWA, Tomoyuki CHIKAMOTO, Shintaro FUKUDA
Article type: Article
Session ID: D-12
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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We made measurement of the energy conservation system which employs double-skin facade in the autumn and winter. Results in the autumn: The slow and stable natural ventilation was realized by utilizing the double skin as a route of gravity ventilation. The natural ventilation efficiency correlates with the indoor and outdoor air temperature difference. Results in the winter: In virtue of heat insulation effect, the double skin ensures desirable radiant heat environment in the room. The heat insulation performance was improved by utilizing columns and braces to increase the heat capacity.
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Tomoyuki CHIKAMOTO, Shintaro FUKUDA, Susumu HORIKAWA, Shunsuke UMEMURA
Article type: Article
Session ID: D-13
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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It is not easy to plan the natural ventilation for the office building in urban area. Objective building has twin double-skin facade to avoid this difficulty. In this study, effects of natural ventilation using twin double-skin facade are examined by wind tunnel test, network model and CFD. According to the results, the building can obtain the natural ventilation well. Furthermore, it is possible to keep indoor thermal environment comfort by the natural ventilation.
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Ayumi MIYAZAKI, Koji KASUYA
Article type: Article
Session ID: D-14
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In this study, we examined gas heat pump air conditioner which improved partial load COP in a building equipped with natural ventilation system. We calculated the annual air conditioning loads and natural ventilation air volume of a model building, and compared them in three cases as to energy consumption and energy saved by natural ventilation system.
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Yoshiyuki SATO
Article type: Article
Session ID: D-15
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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This report is a result of measurement for an office building which has an ecological void. It confirmed a reduced amount of energy consumption of air conditioning where a natural ventilation system is adopted. It also confirmed that the room temperature was maintained properly by measuring its transition when the room was natural ventilated.
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Ken SHOJI, Kiyoshi HIWATASHI, Masafumi SAITO, Miyoshi KATO, Shinkou MI ...
Article type: Article
Session ID: D-16
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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This office building was planed natural ventilation in the renewal project. This paper describes about natural ventilation performance provided from a simulation at the time of the planning and field measurement after construction. These results showed an annual cooling load reduction, exhaust air from top light windows and so on.
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Yuki TAKAHASHI, Jeongsoo KIM, Shin-ichi TANABE
Article type: Article
Session ID: D-17
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Field survey and questionnaire survey was made to a building with manually operated natural ventilation system, to investigate the optimum way to operate the system. From the field survey, it was found that the frequency of the window operation was low. Furthermore, it was indicated that the factor of the window opening is related to outdoor temperature and time. And, from the questionnaire survey, it was know that the office workers were well willing the way of manually operating. Also by factor analysis of the reason of opening and closing the window, it was known that the psychological reasons are similarly important as physiological reasons.
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Ryohei KONO, Shinsuke KATO, Takeo TAKAHASHI, Hiroki TAKAHASHI, Sihwan ...
Article type: Article
Session ID: D-18
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In this study, rooms with openable balcony doors in apartment buildings are targeted, and the effect of balcony itself on the characteristics of room ventilation and airflow in crosswind are analyzed through small wind tunnel experiment. We observed that airflow characteristics of a room attached to a balcony in cross wind in this study is corresponding to ventilation characteristics in previous study. For example, to open one balcony door at leeward side is more effective in terms of intake fresh air than to open a balcony door at other positions, and the depth of balcony does not have so much effect on room airflow characteristics inside of a room in the case of opening two balcony doors.
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Satoru CHIRIFU
Article type: Article
Session ID: E-1
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Solar radiation increases in Japan since about 1990. The measured value of direct solar radiation became 10MJ/m^2 to 11MJ/m^2 and it means about 10% increase. It is thought that this increase means the increase of the air conditioning load, and the choice of the air conditioning equipments will be influenced. In this analysis, the influence of the meteorological factors on the solar radiation is studied.
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Yuji TSUBOTA, Masayuki KASAHARA, Kazumi NAKAYAMA, Yoshikazu HAZAMA
Article type: Article
Session ID: E-2
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Thermal behavior of the dwelling is deferent according to the peripheral environment. In order to realize the thermal influence of the plants such as leaves of trees and loans, we have measured the surface temperatures or surrounding air temperatures of trees since 2005. Last summer we measured surface temperatures of several materials every five minute, such as trees, loans, concrete blocks, concrete and interlocking blocks. According to the calculation methods reported last year, we calculate the surface temperatures, skin loads and cooling loads of the dwelling on a sunny day and cloudy day. When the dwelling is surrounded by trees of 2m tall and has a loan garden, the cooling loads on sunny day is reduced several percents than that of non-green dwellings surrounded by concrete blocks and concrete garden.
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Yuko HOTTA, Masatoshi NISHIOKA, Masaki NAKAO, Minako NABESHIMA, Atushi ...
Article type: Article
Session ID: E-3
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In recent years, with the increase of the heat island effect, there has been much research into the calculation of the urban thermal environment based on these numerical simulations. For simulations at the mesoscale, Nishioka suggested an urban model based on buildings of simplified shapes that conserved the thermal properties of the actual buildings. In this report, the receipt of direct solar radiation by groups of the geometrically-simplified buildings is typified, based on the sky factor of the ground. It's shown that the distribution of the received heat quantity is most likely decided by the sky factor at the ground..
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Kimiko KOHRI, Tomoaki GUNJI
Article type: Article
Session ID: E-4
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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This paper aims to propose a practical method of estimating the values of solar heat gain coefficient and solar transmittance for various conventional windows. However the properties for glazing systems with blinds are dependent on the profile angle as well as the incident angle and the slat angle of blinds, their values have been estimated on the assumption that the profile angle equals the incidence angle and the slat angle is constant. The proposed estimation method can take account of the effect of the actual profile angle and the slat angle.
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Kimiko KOHRI, Yasuhito SUZUKI
Article type: Article
Session ID: E-5
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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The performance of solar shading and the thermal exhaustion effects of ventilation and solar absorption and transmission were analyzed in several double skin cases through numerical simulations under the design solar condition.
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Koki KIKUTA, Hirofumi HAYAMA, Masamichi ENAI, Masaki ITO
Article type: Article
Session ID: E-6
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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The aim of this paper is to estimate the solar radiation load at every floor caused by incident light in skylighted void space. Therefore, we show the illumination distribution to every floor in an insulated building and calculate the solar irradiance from luminous efficacy about the illuminance. In particular, we compare the result between model experiment and numerical analysis and verify the reliability of simulation.
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Tomoyuki KAWAZOE, Tatuo INOOKA
Article type: Article
Session ID: E-7
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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By the revision of the energy-saving law in 2008, the scale of building regulated was reduced from 2,000m^2 or more by 300m^2 or more. The area of thee outer surface of the small building grows more relatively than of the large building. Therefore the small buildings are easy to become affect by the climatic condition. In this study, (1) it was analyzed how the thermal load was influenced by a scale, a climate, a direction, a type of the glass, a ration of the window as the parameters, and (2) it was analyzed how CEC/AC was influenced by the air-conditioning systems.
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Lei YUMOTO, Tatsuaki TANAKA
Article type: Article
Session ID: E-8
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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The inside wall of the wooden dwellings by the two-by-six method were simulated by transient analysis to illustrate the effect of damp proof membrane and type of insulation materials. The seven cities were selected from cold area, Hokkaido and Tohoku. They are Asahikawa and Hirosaki, Akita, Morioka and Yamagata, Sendai and Fukushima. Without the membrane, the walls with only filled insulations were humid. However the wall with added wood fiber insulation were dry, except Asahikawa.
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Sihwan LEE, Shinsuke KATO, Satoshi NIKAWA, Junichi TEZUKA, Wanghee CHO
Article type: Article
Session ID: E-9
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Improvement in the thermal insulating performance of housing and other buildings is important as part of measures of building energy efficient. In recent years, various high-performance adiabatic materials have been developed. However, the standard is not established to measure the thermal performance of the wall installed with the thermal insulating material accurately. Firstly, this paper describes the method to measure the thermal insulation performance of the wall in residential house. In order to analyze the accuracy of this method, the on-spot testing of wall resistance value was carried out in a room of a typical residential house located in Hokkaido, Japan. In addition, the overall heat transfer coefficient of different wall locations were calculated by using Computational Fluid Dynamics (CFD), and compared with the measurement to validate the correctness of CFD simulation approach. By CFD of various factors - the location of the measuring point, the change of the HVAC system, wall resistance value, or window size - can be investigated easily. The simulation results in this paper show that there is no large variation of the overall heat transfer coefficient according to the different location of the measuring wall. However, if the HVAC convector is installed near the measuring the wall, the wall convection heat transfer coefficient was increased.
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Hiroyasu OKUYAMA, Yoshinori ONISHI, Hajime OI, Kenji ONO, Hiroki NAGAY ...
Article type: Article
Session ID: E-10
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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For the heating and cooling experiments conducted on vehicle cabins, the environment in the laboratory simulates the harsh temperature and solar radiation of actual meteorological conditions. Also, this requires an economical predictive calculation model and computer program development to save the time and cost spent on the experiments under various conditions. We have developed a vehicle heat transfer model-the accuracy of which has verified through outdoor measurements. In this paper, a solar lamp energy emission distribution model, a lamp energy receiving model of the vehicle, and further, a comparison between the calculation results and the vehicle cabin cooling experiment are described.
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Makoto SATOH, Mitsuhiro UDAGAWA, Hyunwoo ROH
Article type: Article
Session ID: E-11
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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This paper describes the simulation model of roof integrated solar collector combined with PV module. The simulation model of PV module is coupled with the simulation models for building elements including air solar collector. An example simulation showed the improved efficiency of the PV modules cooled by the air flowing through the backside of the collector.
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Jeongil KIM, Shinsuke KATO, Sihwan LEE, Wanghee CHO, Satoshi NIKAWA, J ...
Article type: Article
Session ID: E-12
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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The purpose of this study is to investigate the effect of reducing energy consumption with the reinforcement of thermal insulation and air-tightness on general wooden house. We used the multi-room thermal load calculation code, TRNSYS. Firstly, we calculate annual heating load and the energy consumption at the test house located in Hokkaido, Japan. Secondly, we examine the energy saving effects on the test house by the thermal coefficient changing of the wall and the window, and air change rate etc. In addition, we compared the thermal insulation renovated house with the non-renovated house. The simulation results in this paper show that the thermal insulation renovated house was calculated 58.7% annual energy reduction than the non-renovated house.
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Keisuke HIGASHI, Ryoichi KAJIYA, Koji SAKAI, Toshikatsu UEDA
Article type: Article
Session ID: E-13
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In this paper, an analysis object is experimental value of turbulent flows in a circular-sectioned 90℃ bend. We analyzed the tube flow using two types of unstructured grid CFD. We compared the analytic value to experimental value. We studied mesh dependent and analysis conditions that the analysis result can be extremely precise. As a result, when we use the only hexahedron grids, the analysis result could be extremely precise.
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Ryoichi AOKI, Koji SAKAI, Hiroki ONO, Ryoichi KAJIYA
Article type: Article
Session ID: E-14
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In this study, the database of an unsteady natural convection for the purpose of establishment of an unsteady CFD has been constructed. As a first step of the study, it was proved that a difference of the CFD analyses by changing a method of modeling on a wall in steady state. Moreover, CFD analysis was compared with an experiment which a real-scale model of the floor heating room was used in steady and unsteady state. As a result, it was shown that the CFD analysis corresponded to the experiment approximately.
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Hiroki ONO, Koji SAKAI, Shizuo IWAMOTO, Ryoich KAJIYA, Ryutaro KUBO
Article type: Article
Session ID: E-15
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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To analysis air heat balance of room by CFD simulation, it is not avoidable to compute natural convection near wall with great accuracy. However, k-c model which is popular in architectural CFD is not suitable in buoyancy prominent field. In this paper, all kinds of LES simulation were employed and compared with experiment conducted by Tian et al. From a result, all static LES models were not able to compute fluctuation because of overestimation in SOS viscosity. However, all dynamic LES models computed fluctuation and heat transfer with great accuracy.
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Masakazu SAKURA
Article type: Article
Session ID: E-16
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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Falling of function causes room air temperature, we have analyzed the natural draft affected on room air temperature for underground space. The temperature fluctuates throughout nighttime, By applying methods of measur, we discovered a temperature fluctuates that the natural convection is a cause of fall temperature for underground space. The primary objective of the new idea of analysis method is investigate the relation between natural draft flow and fall temperatur of room air. The secondary objective of the examine the relation between fall temperatur and draft flow in pass of underground space shape.
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Tatsuya KOBAYASHI, Toshiharu IKAGA, Kenji SUGIMOTO, Toshiaki OMORI, Ku ...
Article type: Article
Session ID: F-1
Published: August 18, 2009
Released on J-STAGE: August 31, 2017
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In recent years, increased energy consumption in Middle East caused owing to increase of the air conditioner demand by advancement of urbanization. For energy consumption reduction, effects of cooling by evaporation at urban areas on artificial island and desert planted trees attract attentions. In this study, these urban areas are measured on the spot and analyzed by CFD. Based on it, effectiveness of artificial island and desert planted trees are confirmed.
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