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5 results on '"Kasahara, Shinichi"'

1. Development and validation of a new variable refrigerant flow system model in EnergyPlus:

Author

Hong, Tianzhen, Sun, Kaiyu, Zhang, Rongpeng, Hinkokuma, Ryohei, Kasahara, Shinichi, and Yura, yoshinori

Abstract

Variable refrigerant flow (VRF) systems vary the refrigerant flow to meet the dynamic zone thermalloads, leading to more efficient operations than other system types. This paper introduces a new modelthat simulates the energy performance of VRF systems in the heat pump (HP) operation mode. Comparedwith the current VRF-HP models implemented in EnergyPlus, the new VRF system model has morecomponent models based on physics and thus has significant innovations in: (1) enabling advanced controls,including variable evaporating and condensing temperatures in the indoor and outdoor units, andvariable fan speeds based on the temperature and zone load in the indoor units, (2) adding a detailedrefrigerant pipe heat loss calculation using refrigerant flow rate, operational conditions, pipe length, andpipe insulation materials, (3) improving accuracy of simulation especially in partial load conditions, and(4) improving the usability of the model by significantly reducing the number of user input performancecurves. The VRF-HP model is implemented in EnergyPlus and validated with measured data from fieldtests. Results show that the new VRF-HP model provides more accurate estimate of the VRF-HP systemperformance, which is key to determining code compliance credits as well as utilities incentive for VRFtechnologies.©

Published
2015

4. GENERAL SESSION

Author

KANAZAWA, Kokichi, primary, MAEDA, Ryuei, additional, IHARA, Nobuo, additional, TAKAMATSU, Hideo, additional, MAEDA, Mise, additional, YAMADA, Kazuyori, additional, YAMASAKI, Masahiro, additional, OHKAWA, Kin-ichi, additional, EBARA, Masaharu, additional, KAMIHATA, Shigeru, additional, OHKUBO, Tatsuya, additional, KISHINO, Yasuo, additional, KATSUSE, Retsu, additional, YANO, Yoshinobu, additional, TAKEUCHI, Tadao, additional, OKUDA, Yoshiaki, additional, NISHIMURA, Hideo, additional, HARADA, Toshinori, additional, SHIMADA, Masateru, additional, HIROSE, Shunta, additional, IWASA, Zenji, additional, YASUTOMI, Masayuki, additional, YAMADA, Ryotaro, additional, TSUJINO, Motoyoshi, additional, KATAYAMA, Atsushi, additional, MURAI, Nobuhiro, additional, JINNAI, Dennosuke, additional, ARAI, Kokichi, additional, IIJIMA, Koichi, additional, KURAHASHI, Koichi, additional, MAEDA, Toshihiro, additional, ANDOH, Katashi, additional, MORI, Kazuhiro, additional, OTSUKA, Nagayasu, additional, MATSUURA, Hideo, additional, YOSHIMURA, Yasro, additional, YOKOTA, Reiko, additional, KATAOKA, Harumi, additional, NAGATSU, Ikuko, additional, ASO, Yoshio, additional, HOSHINO, Yoshinobu, additional, KOISO, Kenkichi, additional, MURAHASHI, Isao, additional, SUGA, Shoichi, additional, AKIYOSHI, Masatoyo, additional, SATO, Kiichi, additional, MIZUNO, Katsuyoshi, additional, FUKUDA, Masatoshi, additional, MIMURA, Yasuo, additional, KOIDE, Tsutomu, additional, BABA, Kensuke, additional, SHIMOSATO, Yukio, additional, NOKUBI, Kazuto, additional, SUZUKI, Takuro, additional, KATO, Morio, additional, KAWAI, Kioko, additional, SUGIHARA, Hajime, additional, TSUCHIYAMA, Hideo, additional, KOIKE, Yasuo, additional, ISHIDA, Yasuo, additional, IIDA, Futoshi, additional, SUGIMOTO, Akitoshi, additional, SAKAMOTO, Kazuo, additional, KIRIMOTO, Koji, additional, OUCHI, Nobuo, additional, ABE, Muneaki, additional, AKAMATSU, Masasuke, additional, MATSUMOTO, Takaharu, additional, SAKANO, Hiroyuki, additional, KONISHI, Yoichi, additional, KATSUI, Takuo, additional, NAKAJIMA, Hideo, additional, KOGE, Katsushiro, additional, MIYATAKE, Minoru, additional, TERAWAKI, Asaharu, additional, HORAI, Zenji, additional, MICHIZAWA, Tsunehira, additional, KASAHARA, Shinichi, additional, KANEDA, Masayuki, additional, KATOH, Tomoe, additional, TANABE, Yoshitsugu, additional, ASOH, Kazuo, additional, NUMANO, Fujio, additional, SHIMAMOTO, Takio, additional, KATSU, Kenichi, additional, TAKENOBU, Makio, additional, KUROIWA, Tomoe, additional, KOBAYASHI, Masahiko, additional, NISHIDA, Shozo, additional, AMEMIYA, Tsugio, additional, KOYAMA, Shinichi, additional, SASAKI, Mitsuo, additional, IWAMASA, Teruo, additional, FUJISAKI, Akiko, additional, ITOH, Mitsuru, additional, MITOMO, Yoshio, additional, ONO, Kazuyuki, additional, YOSHIKI, Shusaku, additional, KURAHASHI, Yoshiaki, additional, KON, Kiyoshi, additional, IZUMI, Haruaki, additional, NEGORO, Takashi, additional, MORII, Sotokichi, additional, MORIMOTO, Yasuhiro, additional, FUJITA, Kuniya, additional, KAWASHIMA, Takao, additional, OGATA, Takuro, additional, MURATA, Fumio, additional, MAYAHARA, Hiroshi, additional, OGAWA, Kazuo, additional, OHKURA, Takuji, additional, and GLENNER, George G., additional

Published
1969
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5. Heat Exchanger Dynamic Observer Design.

Author

Tao Cheng, Asada, Harry H., Xiang-Dong He, and Kasahara, Shinichi

Subjects
*HEAT exchangers, *CHEMICAL engineering equipment, *HEAT transfer, *REFRIGERATION & refrigerating machinery, *EVAPORATORS, *MACHINE design, *ENGINEERING design, *CONDENSERS (Vapors & gases), *AIR conditioning
Abstract

This paper presents the design of model-based nonlinear dynamic observers of an evaporator and a condenser for advanced control of air-conditioning and refrigeration systems. Control-oriented low-order models are derived for the evaporator and the condenser that are spatially distributed. Based on sensor measurements of the evaporating temperature, the nonlinear observer for the evaporator can be used to estimate the heat transfer rate and the length of the two-phase section that cannot be measured directly in transient processes. Based on sensor measurements of the condensing temperature, the nonlinear observer for the condenser can be used to estimate the length of the two-phase section and the length of the subcooling section that cannot be measured directly. The simulation results and experimental testing are also presented. In air-conditioning and refrigeration applications, the nonlinear observers can be utilized to synthesize feedback linearization nonlinear control and provide accurate refrigerant charge inventory estimation and optimization for transient processes. [ABSTRACT FROM AUTHOR]

Published
2005

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