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Article type: Cover
Pages
Cover1-
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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Article type: Index
Pages
A1-A60
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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Takuya MIMURA, Saburo MURAKAWA, Hiroki KITAYAMA, Hiroshi TAKATA, Yasuh ...
Article type: Article
Session ID: A-52
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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The authors carried out questionnaires and field measurements on the hot water consumption and the performance for CO_2 heat pump water heater in houses. The new type CO_2 heat pump systems were set up in 8 houses and the measurement was started from September 2008. In this paper, the performance and characteristics of different heat pump systems were considered on the basis of the results under running condition. Monthly fluctuations of hot water usage and heat pump performance were discussed. Moreover, the general opinion of heat pump water heater system was shown by user survey of website.
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Hiroshi TAKATA, Saburo MURAKAWA, Hiroki KITAYAMA, Yasuhiro HAMADA, Min ...
Article type: Article
Session ID: A-53
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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The authors have measured the energy consumption and the loads of hot water consumption in houses, which have been set up with the new model of CO_2 heat pump water heater (2008 model). This paper proposes the calculation method to estimate energy consumption and coefficient of performance (COP) on the CO_2 heat pump water heaters by the computer simulation. As the result, it is clarified that the calculation method estimates accurately the fluctuation of energy consumption and COP. The usage of function for reheating bathwater has an effect on the running performance of CO_2 heat pump water heater.
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Mari MIYATA
Article type: Article
Session ID: A-54
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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This report describes how to use hot water under actual condition in small households surveyed in detail. The data of the hot water consumption were acquired for one year of 6 actual households in the suburbs of Chubu area. The results show that the average number of turning on the taps was about 70 times/day. The amount of the hot water consumption in a day was in proportion to that. The amount of the hot water consumption in the summer show the factor that there became few generally in comparison with the other period.
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Keita AMAZAWA, Yasuhiro HAMADA, Saburo MURAKAWA, Hiroki KITAYAMA, Mina ...
Article type: Article
Session ID: A-55
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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This paper describes the performance evaluation of domestic hot water supply systems using a storage tank. First, the modified M1 mode as a standard hot water usage mode was mentioned. Second, experiments on the hot water consumption and the performance of CO_2 heat pump water heaters were carried out under the different temperature conditions in a temperature-controlled room. Operational results on hot water loads, amounts of thermal storage in the tank, HPCOP and SCOP were shown
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Tomoaki TANABE, Naoki IMATO, Haruo NOGUCHI, Kazuhiro MIYAMOTO, Taichi ...
Article type: Article
Session ID: A-56
Published: August 12, 2010
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From August 2008 to July 2009 we are surveying and evaluating the commercial heat pump hot water supply system at a dormitory for singles. In this paper we report the actual measurement and analysis.
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Kazutoshi ITO, Masaki KATAOKA, Keiichi YOSHINO, Kazuhiro MIYAMOTO
Article type: Article
Session ID: A-57
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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Commercial hot water heat pumps, ECO-CUTE, have been introduced into the market because of the great role they play in energy conservation and prevention of global warming. However, there is very little or no actual survey data of the heat pump to establish performance, energy conservation and impact on the environment under various operating conditions such as ambient and water supply temperatures. In order to verify the effect the heat pump on energy conservation, measurements were performed on a heat pump installed in a company dormitory from winter to summer and an evaluation was carried out. This paper reports on the results of the survey.
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Akira MURAKAMI, Haruo SOEDA
Article type: Article
Session ID: A-58
Published: August 12, 2010
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In this paper, we investigated the influence of inlet air temperature, inlet water temperature and outlet water temperature of heat pump on Coefficient of Performance (COP) of CO_2 heat pump water heater. We also investigated the measurement accuracy of COP on the side of heat pump outdoor unit.
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Yasuhiro HAMADA, Keita AMAZAWA, Takuya MURAI, Mitsuru NAKAMURA, Hiroyu ...
Article type: Article
Session ID: A-59
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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This paper describes the performance evaluation of solar collectors. First, the specifications of solar collectors; measurement items and experimental conditions at each site were mentioned. Second, experiments on the performance of the solar collectors were carried out. Finally, the numerical simulations on solar collectors were carried out.
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Yasuyo MATOBA, Mitsuhiro UDAGAWA, Takafumi KUSUNOKI
Article type: Article
Session ID: A-60
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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Solar DHW heating system is expected to reduce the energy consumption of the domestic hot water heating. In this study, the position of the mixing valve to control the flow rate from the solar hot water tank was discussed. This simulation was carried out for three cases. In Casel, the mixing valve is place after the boiler. In Case2, the boiler inlet temperature is controlled at 30 ℃ in all day. In Case3, the temperature is controlled at 30 ℃ or 45 ℃ depending on the boiler set point temperature. As a result, it was found that the difference in the boiler heating load between Case1 and Case2 was large. However, the difference between casel and Case3 was very small.
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Asana NAKAMURA, Ryoko HATANO, Mao SERIKAWA, Masayuki MAE, Takashi INOU ...
Article type: Article
Session ID: A-61
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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Energy consumption for hot-water supply accounts for more than 30% of total energy consumption in housing. It is essential to save energy consumption for hot-water supply. The objective of our studies is to clarify the differences of thermal environment caused by various planning of envelope in bathroom. The measurement showed that facing larger exterior wall and single-glassing window tended to poor thermal condition. The result of analysis suggested that reform of thermal insulation and heating bathroom would improve the condition significantly.
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Mao SERIKAWA, Ryoko HATANO, Asana NAKAMURA, Masayuki MAE, Takashi INOU ...
Article type: Article
Session ID: A-62
Published: August 12, 2010
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In this research, effects of insulation and heating on bathroom thermal environment are verified through experiment. Assuming soaking in a bath during bathing, temperature in a laboratory bathroom with water run into a bathtub is measured in detail. Influence of insulation is inspected in point of how warm it becomes in the bathroom with insulating. Heating is estimated with thermal distribution in the bathroom and amount of energy used to realize the thermal environment in comparison with energy for hot-water-supply.
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Ryoko HATANO, Asana NAKAMURA, Mao SERIKAWA, Masayuki MAE, Takashi INOU ...
Article type: Article
Session ID: A-63
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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This report shows several effects that improvement of bathroom thermal environment brings by the subject experiment in housing. In this exam, we measured energy consumption for hot water supply and air-temperature in the bathroom and performed questionnaire investigation. As a result, it was indicated that improvement of thermal environment by bathroom heating brought in bathing comfort and reduction of shower consumption, quantity of hot water of bathtub and additional heating. Therefore, by improving thermal environment, it is suggested that there is a possibility of reducing total energy use, including hot water supply and space-heating.
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Ikki KOBAYASHI, Masayuki OTSUKA, Yuta TAKAHASHI, Shin KONO
Article type: Article
Session ID: A-64
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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In supporting energy saving, highly energy efficient cold/hot water-saving equipment has been developed and it has been increasingly introduced in house. The plughole with high effect of saving hot water was developed along with it. In the present study, effectiveness was examined with the plughole, and to understand water conservation volume and the amount of the gas reduction.
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Naohumi KOBAYASHI, Masayuki OTSUKA, Shin KONO, Ikki KOBAYASHI, Sadanor ...
Article type: Article
Session ID: A-65
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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This study used an existence dwelling unit of a single lever faucet developed saving cold / hot water for a purpose about a saving hot water effect and investigated it and was aimed at grasping the effect quantitatively through the year. In this report, we described about result of kitchen system and the washroom system in the winter season.
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Takeshi NAGAI, Hideyuki HOSONO, Tohru TAKAHASHI, Takayuki FUJIWARA
Article type: Article
Session ID: A-66
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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Garbage and paper waste is low recycling rate, so basic research has been carried out applying dry methane fermentation system to those waste in Tokyo. The result shows that waste adapted to dry methane fermentation is sorted at almost workplaces and the efficient use of waste as biogas could be expected.
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Hideyuki HOSONO, Tohru TAKAHASHI, Kazunari YAMAMOTO, Takeshi NAGAI, Ta ...
Article type: Article
Session ID: A-67
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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We are developing a system to produce biogas from garbage and paper waste, which is low recycling rate by dry methane fermentation. It was found that large amounts of biogas could be obtained from waste. Energy recovery and decomposition rate was 84 and 80 percent, respectively. Compared to conventional waste incineration plants, we have calculated the energy balance of the entire dry methane fermentation plant. The result shows that this fermentation plant can use biomass energy efficiently than conventional systems.
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Youhei NATSUMI, Keiko NOCHI, Masayuki OTSUKA
Article type: Article
Session ID: A-68
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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This study cultivated minute algae high-density, and it was included in the water treatment equipment, and the experiment which dealt with the carbon dioxide was carried out. As minute algae concentration and minute algae and separation method of the treated water, the filtration film equipment was used. By the minute algal biomass equipment, dealing with experiment which continued in respect of the carbon dioxide inclusion drainage was carried out. As the result, 67% ( median value, n=47 ) was obtained the carbon dioxide removal rate.
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Yuichiro TAGUCHI, Gyuyoung YOON, Masaya OKUMIYA, Hisataka KITORA, Hide ...
Article type: Article
Session ID: B-47
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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This study aims for development of the simulation models for ground source heat pump system in order to apply practical tool to designer. The developing models are composed of two editions which can be used according to the purpose of use. Also the models are developed on EXCEL sheet, can be coupled with LCEM tool, to make easy to use. In this paper, one of edition which considers ground thermal conduction is discussed; this edition can calculate temperature of ground surround ground heat exchanger and heat source water temperature based on cylindrical coordinate. The calculation algorisms used on this model are shown and the test calculation results are shown.
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Takeshi IWAMOTO, Sayaka KINDAICHI, Ryuji YANAGIHARA, Eichi KUROMOTO, H ...
Article type: Article
Session ID: B-48
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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A "macro model" is developed as one of analysis models in system simulation for ground source heat pump systems. The model is targeted for central heat source systems applied ground source partially. Annual hourly variations of heat source temperatures are summarized in simple expressions by using logarithmic functions in the model. The model is applicable for systems with different parameters including ground properties and heat pump efficiencies. It also can be available at the planning stage of GSHP systems and furthermore applied for system simulation for the whole air conditioning systems.
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Takao KATSURA, Yasushi NAKAMURA, Katsunori NAGANO, Toru OKAWADA
Article type: Article
Session ID: B-49
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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When the ground source heat pump (GSHP) system is installed to the commercial building in moderate climate region, ground temperature is raised by imbalance between cooling load and heating load. In this case, it is necessary to release the excess exhaust heat to the atmosphere with cooling tower. Therefore, the authors developed a performance prediction tool for the GSHP system combined cooling tower. In addition, performance of the GSHP system combined cooling tower, which will be installed in a new office building in Kitakyushu, is predicted with the tool. The result shows the GSHP system can operate with high efficiency long term although the cooling load is too much compared to the heating load.
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Toru OKAWADA, Katsunori NAGANO, Yasushi NAKAMURA, Takao KATSURA
Article type: Article
Session ID: B-50
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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The authors investigate operating and design method of the ground source heat pump (GSHP) system combined cooling tower by using a computer aided simulation program. The GSHP system provides the highest performance when cooling tower is connected in series with ground heat exchangers (GHEXs) and the water as thermal medium is circulated to the cooling tower ahead of the GHEXs. Furthermore, the system performance is increased by set the water temperature in which the cooling tower is operated. Finally, we measure and evaluate the performance of a low flow circulation GSHP multi-split system combined cooling tower, which is installed an actual building.
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Shigeaki NARITA, Hikari FUJII, Naokatsu CHOU
Article type: Article
Session ID: B-51
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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The Ground Source Heat Pump system has been recognized as a common energy saving measure in cold climate regions in Japan. For the further spread over the country, it seems to be required to establish the designing protocol for cooling use. An experiment on a GSHP system with boreholes is performed in view of gathering basic data for cooling design and operation. Discovered are some features distinguished from the heating use.
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Yoshimi ISHIKAWA
Article type: Article
Session ID: B-52
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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Thermal performance of the ground source heat pump (GSHP) system installed in a detached wooden house in Sendai was measured for more than one year. As the results of the investigation, the system coefficient of performance was about 2.6 in January and from 0.5 to 2.9 in August. In addition, it was found that, in the winter, the principle of the energy conservation among the heating output of GSHP, the pumped heat from the ground and the electric power consumption was realized, and, GSHP was superior in the environmental property and the cost performance to the kerosene heater.
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Hisashi WAKAYAMA, Kazuki NAKANO, Shoichi NAKAI, Takashi MATSUMOTO, [in ...
Article type: Article
Session ID: B-53
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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We designed R hospital in Chiba with totally electrified heat source system and it is completed in Feb 2008. In this paper, the cooling and heating load and peak load is confirmed in summer, winter and the mid-season. And, water and hot water consumption is reported, and they are compared with planned value. Furthermore, we proposed the operation to reduce the energy consumption that the heat source equipment is halted when heating load is unwanted in summer or cooling load in winter and the impact is estimated.
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Hisashi WAKAYAMA, Takashi MATSUMOTO, Kazuki NAKANO, Shoichi NAKAI, Mas ...
Article type: Article
Session ID: B-54
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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R hospital had started an operation in April, 2008. And it has been started to measure data about heating and cooling system from August 2008. This report is noted data of the ground source heat pump system from Aug 2009. It is noted the summary of commissioning for GSHP system and the results of tuned up the GSHP system setting condition.
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Yumi ASHITANI, Yasuyuki SHIRAISHI, Yuji RYU
Article type: Article
Session ID: B-55
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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In recent years, underground pit system is often adopted as a passive heat source system at the office building. However, the optimal design manual or operation guideline of the underground pit system are not yet created or cleared. As a basic study of effective use method of an underground pit system, Evaluation of heat transfer characteristics in underground pit was conducted based on CFD analysis in this paper. It is important to utilize the under surface as a cooling source in a pit for summer effectively by consideration on a pit design etc.
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Yujin NAM, Ryozo OOKA
Article type: Article
Session ID: B-56
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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In order to estimate the potential for ground source heat pump systems, it is necessary to quantitatively evaluate the effect of the ground thermal properties on the heat exchange rate. In this research, a case study using the numerical simulation tool was conducted to evaluate the system performance sensitivity based on ground conditions such as heat conductivity, heat capacity and groundwater flow. The simulation tool is coupled with the groundwater and heat transfer model, surface heat balance model and ground heat exchanger model. It is possible to enhance the prediction accuracy by using this tool, which can represent a ground heat exchanger using the finite element method. A numerical model with a ground heat exchanger (Depth 100m) was used in the calculation and, their effect on the system performance was estimated through the sensitivity analysis with the developed simulation tool. In the result of simulation, it founds that the faster groundwater flow and the higher heat conductivity the ground has, the more heat exchange rate the system in the site can achieve.
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Kenji MIKODA, Takashi TSUCHIYA
Article type: Article
Session ID: B-57
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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This paper shows the thermal performance of ground heat exchangers of two different types by heat extraction tests. These tests were carried out with standard double U-tube indirect heat exchanger (A-type) and direct circulating heat exchanger using corrugate tube (B-type). As a result, it is concluded that the thermal performance of B-type is 20% higher than that of standard A-type.
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Takayoshi KOZAI, Hisashi HANZAWA, Masahiro UOZUMI, Toshiya MURAKAMI
Article type: Article
Session ID: B-58
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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This paper deals with measuring system and measured data for HVAC system of the office building utilizing a ground source heat pump (GSHP) in Obihiro, Japan. According to measured data in the first winter for the building, the performance of GSHP and the indoor climate have been estimated. COP of the heat pump system as an average was about 3.0 and the room air temperatures were almost satisfactory. Since some problems of HVAC operation has been found, continuing measurement will be needed to evaluate energy saving in following seasons.
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Ryota KUZUKI, Thoru ICHIKAWA, Yasuo NAKAJIMA, Toshiki ISHIKAWA, Ritsu ...
Article type: Article
Session ID: B-59
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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This paper describes a overview of a practice of inter-building thermal transfer system using solar energy in Kumagaya city. Thermal energy obtained from the solar heat collectors is shared in neighboring two buildings, an office building and a hotel, and used for heating, cooling and hot water. The system keeps thermal energy supplies stable by harmonizing variable output of solar energy combining with a natural gas cogeneration system. The system is expected to contribute maximum use of collected solar heat through a year to achieve higher level of energy saving and carbon emission reduction in the neighborhood.
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Takuya SHINODA, Kazuyuki KATO, Hideki TANAKA, Mika YOSHINAGA, Masaya O ...
Article type: Article
Session ID: B-60
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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This study focuses the air-conditioning system assisted by the solar energy installed in a office building. We developed a heating system model in order to support design and tuning hot-water-supply system and air-conditioning system. We show how to make the heating system model and calculate with LCEM software. We tested the simulation results for the validity by comparison with the actual measurement data.
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Shuichi ISHIMURA, Katumi MATSUDA
Article type: Article
Session ID: B-61
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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We evaluated a solar water heater for dwellings. According to our simulation which deals with surplus and shortage of hot water, though it is an ideal condition, it can't save the half on hot water energy. In the town gas area, it is extremely difficult to collect the amount of money of the investment within ten years, by using a present solar water heater. "The improvement of heat insulation capacity" and"To connect water service directly" are effective, for the technical improvement. And, installation to get the maximum annual quantity of solar radiation is important.
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Noritaka OKA, Takashi AKIMOTO, Keizo YOKOYAMA, Susumu NAKANO, Yoshikaz ...
Article type: Article
Session ID: B-62
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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The system of supplying hot water that utilized solar energy was simulated to investigate effects of the type of collectors, flow rates, and tank volume for various patterns. For most of cases of CPC type collectors, collectors efficiency were stable, however, optimized cases of flat type collectors exceeded them. The solar air-conditioning system is scheduled to be examined in the near future.
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Toshiyuki HINO
Article type: Article
Session ID: B-63
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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The PV Sol-Air heat pump (PVSAHP) employing refrigerant-direct solar collectors attached with photovoltaic cells, was applied to the new KaTRI building in Tokyo and its operational results are summarized. In summer, the PVSAHP radiated heat during nighttime to remove excess heat of the underground tubes. In winter, the same HP collected heat both from solar and air and warmed the circulating water. Nearly half of the compressor consumption was supplied by the solar cells on net-basis. Integration of the PVSAHP to the Renewable Ground Loop system is also explained.
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Eiichi OZAKI, Keiichi Yoshino, Toshiro ABE, Kazuhiro MIYAMOTO, Tomoyos ...
Article type: Article
Session ID: B-64
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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In a health care facility for elders in Tokyo, operating data of a system, which consists of two CO2 heat pump water heaters, a hot water storage tank and a pump, was measured during 13 months to the last February. Driving efficiency and hot water quantity from the heat pump in real load were measured. Effect of frequency of frost and defrost on mean efficiency in winter is reported. Relation between outdoor temperature and supply water temperature, and characteristics of hot water supply quantity in a week and in a season are reported.
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Haruka MABUCHI, Daisuke KOSHIMIZU, Takeshi YOKOYAMA, Yoshihiro ZUSHI
Article type: Article
Session ID: B-65
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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Solar water heating package for light commercial use was developed. We properly designed the system for huge and endless hot water demand. For such users, tank volume could be smaller, so we adopted 200-liter tank. And solar collector can be connected up to16m^2, four tunes as large as domestic use. Due to the system is packaged, it could be reduced size. In September 2009, we have installed the solar water heating package for light commercial at a casual restaurant and tested the system performance.
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Akiya OZAWA, Yoshiharu ASANO, Hideki TAKAMURA, Yuuki ABE
Article type: Article
Session ID: B-66
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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The authors investigated how to use the residential gas engine co-generation systems (GE-CGS) and condensing type gas water heater systems in a detached house of Nagano prefecture. And we analyzed energy efficiency of these systems from the summer to the winter season. As a result, energy efficiency of condensing type gas water heater systems is higher than energy efficiency of GE-CGS in the summer, a fall, and all periods. But energy efficiency of GE-CGS and condensing type gas water heater systems do not have a difference in the winter season.
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Tsuyoshi FUNATO, Yoshinori KAIGUCHI, Eichi KUROMOTO, Hiroki WATANABE
Article type: Article
Session ID: B-67
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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By introducing the Hybrid Hot-Water Supply System carried out as part of the Energy -Saving conservation measures in the Resort Hotel of a Cold District, 13% of energy-saving Results was able to be acquired in object equipment. The contents of employment adjustment after the prior examination at the time of system introduction and the Energy-Saving effect verification are reported.
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Tsutomu NAGATA, Takaki SATOH, Takao MAKINO, Yasuhiro HAMADA, Takayuki ...
Article type: Article
Session ID: B-68
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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If snow and ice can be kept and utilized as cooling sources for space cooling and food storage, they will have possibility of energy conservation and CO_2 reduction. This paper shows results on field experiments on snow melting characteristics of various sheet covered snow mounds and compared thermal insulation performance.
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Tsutomu NAGATA, Takaki SATOH, Yusuke IMURA, Yasuhiro HAMADA, Takayuki ...
Article type: Article
Session ID: B-69
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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If snow and ice can be kept and utilized as cooling sources for space cooling and food storage, they will have possibility of energy conservation and CO_2 reduction. Thermal utilizations of snow and ice have been noticeable since the Law Concerning Special Measures to Promote the Use of New Energy was amended to add the use of them. This paper proposes cool energy supply system by using snow cannon. First, we analyze the characteristic of snow which snow cannon made. Second, we evaluate the introduction possibility of snow cannon to Hokkaido.
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Masatoshi FUJISHIMA, Eisuke OTSUKA, Koichi ABE, Shinya YAMAZAKI, Atsus ...
Article type: Article
Session ID: B-70
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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If snow and ice can be kept and utilized as cooling sources for space cooling and food storage, they will have possibility of energy conservation and CO_2 reduction. Thermal utilizations of snow and ice have been noticeable since the Law Concerning Special Measures to Promote the Use of New Energy was amended to add the use of them. First, this paper proposes the outline of low-carbon business model using snow-and-ice resource and exhaust heat from hot spring. Second, field experimental results are shown.
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Kazuto KITAHARA, Kazuyuki KOBAYASHI, Hiroshi KAJII, Mariko MITSUMORI, ...
Article type: Article
Session ID: D-48
Published: August 12, 2010
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 around 40℃ and that the APF of it can be more than 2.7. And it gives high amenity and high energy conservation to use the floor heating system and the air-conditioner together.
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Sookyung KIM, Ryohei KONO, Makoto SATO, Yoshihiko AKAMINE, Hiroshi KAJ ...
Article type: Article
Session ID: D-49
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
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In this paper, effects of the heat pump control method to thermal quantity stored into the Phase Change Material (PCM) panels by solar radiation and thermal balances of the laboratory, was investigated. We determined that appropriate water temperature inlet to the PCM panel on the floor. In addition, we confirmed that small quantity of heat storage by Heat Pump at night cause large quantity of heat storage by solar radiation. Also, we experiment on heat-storage efficiency by solar radiation according to heat storage quantity by Heat Pump as the tomorrow weather condition.
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Kentaro MORI, Takashi AKIMOTO, Tatsuo NAGAI, Keisuke EMOTO
Article type: Article
Session ID: D-50
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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Despite using heating equipment only in winter, heating energy consumption used in home is large on the whole energy consumption. So if we evaluate fundamental performances of residential heating equipment, it is important to evaluate not only thermal sensation and comfort sensation, but also energy saving. Because heating energy consumption in winter is affected by region, floor, position, insulating efficiency and so on, it is suggested to consider them when proposing heating system. So we have researched the using actuality of the heating equipment and energy consumption in an apartment house, and also have investigated thermal environment by computer simulation.
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Ryoichi KAJIYA, Koji SAKAI, Kodai HIRUTA, Makoto KOMURO
Article type: Article
Session ID: D-51
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
This synopsis was aimed for establishment of the thermal comfort evaluation in the heating room. It compared CFD analysis and the subject experiment that used thermal mannequin. And examined the influence that the human body takes by heterogeneous emission environment on CFD. As a result, it was confirmed that surface and air temperature, a tendency of the wall surface temperature were almost caught by a subject experiment and the comparison of CFD.
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Shinya TAZAWA, Yuzo SAKAMOTO, Takashi AKIMOTO, Shoshi KAZUE, Yasukazu ...
Article type: Article
Session ID: D-52
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The purpose of this study is to reveal energy performance and thermal comfort of a mini-split heat pump air conditioner during heating season. We have measured energy consumption and thermal environment of a room where the air conditioner was installed. The room was in a climate chamber and air temperature in the chamber was controlled as average outdoor air temperature of Osaka in January. The mini-split heat pump air conditioner worked with maximum COP during 20% partial heat load with intermittent heating. The average COP was about 3.65, compared with its standard COP 4.18 in this operation.
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Yasukazu KAWARAGUCHI, Yuzo SAKAMOTO, Takashi AKIMOTO, Hideo ASADA, Shi ...
Article type: Article
Session ID: D-53
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
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The purpose of this study is to reveal energy performance and thermal comfort of a mini-split heat pump air conditioner installed in a room of a residential apartment building with average insulation during heating season. The room air conditioner was chosen according to the floor area of the room. The result of the experiment shows that 30% partial heating load of the air conditioner was frequently appeared and COP was relatively high. This fact shows a mini-split heat pump air conditioner installed in the room in an apartment building will work with high COP during most of the heating season.
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Shoshi KAZUE, Yuzo SAKAMOTO, Takashi AKIMOTO, Yasukazu KAWARAGUCHI, Hi ...
Article type: Article
Session ID: D-54
Published: August 12, 2010
Released on J-STAGE: August 31, 2017
CONFERENCE PROCEEDINGS
FREE ACCESS
The purpose of this study is to compare thermal comfort of a room space heating with two different heating systems. The one is a mini-split heat pump air conditioner and the other is floor heating system uses warm water supplied by a heat pump. To do this, we have conducted subjective experiments. The result shows that the difference of thermal comfort between a room space heating with a heat pump air conditioner and with floor heating was small and both of them could realize comfortable environment.
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