Search Results 1-20 of 11147

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Effect of change factors on evaporation loss based on cold end system in natural draft counter-flow wet cooling towers

YUAN Wei , SUN Fengzhong , LIU Ruqing , CHEN Xuehong , LI Ying

… The water loss caused by evaporation heat dissipation is non-negligible for a natural draft counter-flow wet cooling tower (NDWCT), which is evidently influenced by many change factors. … Then, the effect of change factors, including mass flow rate of circulating water and air parameters, on the tower evaporation loss is studied in the case of fixed the thermal load dissipated by the condenser. …

Journal of Thermal Science and Technology 16(2), JTST0015-JTST0015, 2021

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Surface density function evolution and the influence of strain rates during turbulent boundary layer flashback of hydrogen-rich premixed combustion

Ahmed Umair , Pillai Abhishek L. , Chakraborty Nilanjan , Kurose Ryoichi

… The statistical behavior of the magnitude of the reaction progress variable gradient [alternatively known as the surface density function (SDF)] and the strain rates, which govern the evolution of the SDF, have been analyzed for boundary layer flashback of a premixed hydrogen-air flame with an equivalence ratio of 1.5 in a fully developed turbulent channel flow. … The non-reacting part of the channel flow is representative of the friction velocity based Reynolds number Reτ = 120. …

Physics of Fluids 32(5), 2020-05-29

IR
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Development of A Cold Feeling Presentation Unit Using Gap Flow of Air [in Japanese]

SAKAGUCHI Masamichi , OGASAHARA Kentaro

… We have developed a unit that presents a sense of coolness by the air flowing between the presentation unit and the body surface, which is generated when air is released from the presentation unit toward the body surface. …

The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2020(0), 2A2-N18, 2020

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Particle Behavior in Cold Model of New Horizontal Rotary Kiln with Internal Spiral Transport Mechanism [in Japanese]

Ito Takuya , Nomoto Yosuke , Ukishima Yuki , Murakami Kan , Sugawara Kazuki , Suzuki Seiichi , Kato Shigeru , Hatta Akimichi , Kojima Toshinori

… By applying this to a gasifier, high/middle calorie fuel gas is expected to be produced by using air without indirect heating. … In the present study, a basic examination on particle behavior was carried out by using the cold model to develop a new rotary kiln gasification process. …

KAGAKU KOGAKU RONBUNSHU 46(6), 193-199, 2020

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Active control of coaxial jet flames under different fuel compositions through manipulation of mixing process with miniature jet actuators

SAIKI Yu , KURODA Masahiro , NAKURA Kasumi , ISHINO Yojiro

… The gaseous fuel-air coaxial jet flow and combustion under different fuel compositions are actively controlled through periodic excitation of the initial jet shear layer with arrayed miniature jet actuators equipped on the inner surface of the annular nozzle. … Firstly, it is found that the large-scale vortical structures and the associated mixing in the cold coaxial jets are flexibly controlled by changing the injection frequency fv …

Journal of Thermal Science and Technology 15(1), JTST0011-JTST0011, 2020

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IMPROVEMENT OF INDOOR ENVIRONMENT BASED ON MULTIPLE INTERZONAL AIRFLOW ANALYSIS:Study on indoor environment of welfare facility for the elderly in winter [in Japanese]

TAKADA Satoru , IMAI Yuki , HOKOI Shuichi , OGURA Daisuke , IBA Chiemi

… However, excessive ventilation in winter promotes the inflow of outdoor air with low temperature and humidity, and brings low humidity, cold draft, and increase in heating load. … The distributions of air temperature, humidity and CO2 …

Journal of Environmental Engineering (Transactions of AIJ) 85(770), 249-258, 2020

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Statistical Characteristics of Pre-summer Rainfall over South China and Associated Synoptic Conditions

Li Zhenghui , Luo Yali , Du Yu , Chan Johnny C. L.

… (equivalent potential temperature) air to the west- and east-inland regions, respectively. … Warm-sector coastal rainfall is closely related to the deceleration of the southerly boundary layer (BL) air flow over the northern SCS and associated convergence of BL high-θe … air near the coast. …

Journal of the Meteorological Society of Japan. Ser. II 98(1), 213-233, 2020

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8

STUDY ON OPERATION METHOD OF CEILING RADIATION AIR-CONDITIONING SYSTEM WITH HEAT CAPACITY OF SKELETON [in Japanese]

MURAMATSU Hiroshi , NOBE Tatsuo

… Two air-conditioning systems are installed in this building— a ceiling radiation air-conditioning system, and a whole-floor blow-off air-conditioning system. … The ceiling radiation air-conditioning system employs a reverse slab structure. … In this system, ceiling radiation is performed by allowing cold or hot water to flow through a pipe buried in a ceiling slab. …

Journal of Environmental Engineering (Transactions of AIJ) (766), 1095-1104, 2019-12

J-STAGE AIJ
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USEFULNESS VERIFICATION BY SUBJECTIVE EXPERIMENT OF EVALUATION METHOD FOR THERMAL ENVIRONMENT "SCORE ON THE WARMTH" UTILIZING CASBEE HOUSING HEALTH CHECKLIST [in Japanese]

ARAKI Yumiko , WATANABE Yosuke , WAKABAYASHI Koya , TANABE Shin-ichi , KAGIYA Shin-ichi , FUJIMURA Hiroko , TSUDA Keiko

… In fact, health damage caused by cold houses is a continuing issue, with heat shock responses, sleeping disorders, etc. … matches the actual human physiological and psychological response. Subjective experiments were carried out under five conditions with a combination of air temperature controlled by floor heating / air conditioner and floor temperature. …

Journal of Environmental Engineering (Transactions of AIJ) (763), 845-854, 2019-09

J-STAGE AIJ
10

ENERGY PERFORMANCE EVALUATION OF THERMO-ACTIVE BUILDING SYSTEM BASED ON SIMULATION AND MEASUREMENT [in Japanese]

MURAMATSU Hiroshi , TOGASHI Eisuke , NOBE Tatsuo

… An air conditioning system that actively utilizes the heat capacity of the building frame (building thermal mass storage system) has a history of almost 100 years. … Until now, in Japan, models and research results have been primarily obtained by blowing cold and hot wind against a concrete structure using fans. …

Journal of Environmental Engineering (Transactions of AIJ) (762), 759-769, 2019-08

J-STAGE AIJ
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Non-contact cold sensation display by controlling flow velocity of cold air [in Japanese]

許佳禕 , 黒田嘉宏 , 吉元俊輔 , 大城理

システム制御情報学会研究発表講演会講演論文集 63, 413-417, 2019-05-22
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Numerical Simulations on Energy and Moisture Control Characteristics for the High Performance Detached Houses Designed for the Cold Climate Zone (Part3) Results on the Multi Zones Condition by the Air Flow Network Model [in Japanese]

芝池英樹 , 水野上徹

… In residential buildings, the ventilation system and air flow routes are important since they affect IAQs and air conditioning loads directly. … In this paper, air conditioning loads, PMV, and CO2 concentration in building envelopes with three kinds of ventilation system are simulated by WUFI Plus 3.1. …

Techinical Papers of Annual Meeting the Society of Heating,Air-conditioning and Sanitary Engineers of Japan 2019.4(0), 45-48, 2019

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13

Development of an Adsorption Refrigerator with Regenerative Adsorbent Working at Low Temperature:Part 3-Controlling the Cold-Water Temperature at the Outlet by Adjusting the Cooling Water Flow Rate [in Japanese]

MATSUDA Yuki , KOGANEI Makoto , YAMASHITA Tetsuo , HIYAMA Kyosuke , KONDO Takeshi , KATO Shinsuke

… In this refrigerator, the cold water outlet temperature fluctuates, and with increase in the cycle time, the fluctuation range becomes larger. … Therefore, it may be difficult to use this in air conditioning applications or applications requiring accurate water supply temperature. … In a previous study, the amount of cooling water supplied to a heat exchanger (HEX) coated with an adsorbent was varied to maintain a constant cold-water temperature at the outlet. …

Transactions of the Society of Heating,Air-conditioning and Sanitary Engineers of Japan 44(262), 15-21, 2019

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14

Relationships among the Urban Heat Island Phenomenon, Cold Air Pool, and Mountain Breeze on Clear, Calm Nights during Autumn and Winter in Nagano City [in Japanese]

Hiroaki YAMATO , Takashi HAMADA , Hiroharu TANAKA , Masatoshi KURIBAYASHI

… The purpose of this paper is to clarify the relationships among the urban heat island （UHI） phenomenon, cold air pool, and mountain breeze, focusing on the urbanization index and altitude, for the entire city of Nagano. … Several hours post-sunset, a cold-air pool also developed, and the temperature distribution associated with the UHI was maintained at the bottom of the cold-air pool until sunrise. …

E-journal GEO 14(1), 197-212, 2019

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15

DEVELOPMENT OF CONTROL METHOD OF VENTILATION PREHEATING SYSTEM WITH PHASE CHANGE MATERIAL BY MACHINE LEARNING [in Japanese]

KUDO Kazuki , MORI Taro

… Introduction The number of residences with thick insulation and air-tightness continues to increase in cold region. … Therefore, in this research, we aim to develop a control method for a fan air volume of ventilation preheating system by machine learning. …

Journal of Environmental Engineering (Transactions of AIJ) 84(759), 515-524, 2019

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Spatial Patterns of Winter Precipitation in the North-Central Region (Hokuriku District) of Japan

Arai Kengo , Yasunaga Kazuaki

… It is suggested that interactions between cold air over the land and warm air over the ocean are essentially important to the distinct precipitation patterns; … offshore winds wedge the inland cold air under the maritime warm air, and intensifies the precipitation over the ocean. …

SOLA 15(0), 80-86, 2019

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Roasted Barley Extract (Mugicha) Containing Cyclo(D-Phe-L-Pro) Prevents a Decrease in Skin Temperature in Cold Conditions: A Randomized, Double-Blind, Placebo-Controlled, Crossover Study

ASHIGAI Hiroshi , MIZUTANI Mai , IKESHIMA Emiko , NAKASHIMA Keiko , TANIGUCHI Yoshimasa , MATSUKURA Yasuko , YAJIMA Hiroaki

… Previously, we reported the effects of RBE containing cyclo(d-Phe-l-Pro) on blood flow in animals and humans and investigated rapid skin temperature recovery from cold-water immersion in women. …

Journal of Nutritional Science and Vitaminology 65(1), 90-93, 2019

J-STAGE Ichushi Web
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Effects of Jet Arrangement and Jet Height on Flow Characteristics of Air Impingement

Yang Dazhang , Xie Jing , Wang Jinfeng , Shu Zhitao

… Air impingement is a cooling technology which applies to freezing, cooling and plastics industries. … An air impingement device was set up to investigate the flow characteristics of air jets. … The influences of the arrangement and jet height on air flow characteristics were investigated experimentally. …

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 52(2), 179-184, 2019

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Cold Air Mass Analysis of the Record-Breaking Cold Surge Event over East Asia in January 2016

YAMAGUCHI Junpei , KANNO Yuki , CHEN Guixing , IWASAKI Toshiki

… An extreme cold surge event caused record-breaking low temperatures in East Asia during 20-25 January 2016. … The planetary- and synoptic-scale feature of the event is investigated quantitatively using the isentropic cold air mass analysis with a threshold potential temperature of 280 K. …

Journal of the Meteorological Society of Japan. Ser. II 97(1), 275-293, 2019

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PROTOTYPE OF VENTILATION PREHEATING SYSTEM BY SOLAR AIR HEATING COLLECTOR COMBINED WITH PCM PANEL:Creation of numerical model and consideration of cascade system [in Japanese]

KUDO Kazuki , MORI Taro , ISHIDOYA Yuji , OHTSUKI Yoshiko , KUSAMA Yuka

… Introduction In cold climate area, the number of houses with high energy efficiency and high airtightness continues to increase. … Most of the heating loads for such houses are caused by fresh air which has large temperature differences. …

Journal of Environmental Engineering (Transactions of AIJ) (750), 669-678, 2018-08

J-STAGE AIJ

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