Toshitaka Takei

Tokyo University of Agriculture and Technology

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Atsushi Akisawa

Tokyo University of Agriculture and Technology

Takumi HASHIZUME

Waseda University

Yuki UEDA

Tokyo University of Agriculture and Technology

Yoshiharu AMANO

Waseda University

Fumi Watanabe

Tokyo University of Agriculture and Technology

Keisuke Takeshita

Toyota Motor Corporation (Switzerland)

Kazumichi ARAKI

Tokyo Institute of Technology

Koji Enoki

University of Electro-Communications

Kiyoshi Saito

Waseda University

Sunao Kawai

Waseda University

Cooperative Institutions

Waseda University

Tokyo University of Agriculture and Technology

Tokyo Institute of Technology

Tokyo University of Agriculture

The University of Tokyo

Tokyo Gas (Japan)

Central Research Institute of Electric Power Industry

Nagoya University

Nagasaki University

Saitama Prefecture

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Application of ammonia-water absorption cycle to transfer cooling and heating at ambient temperature

Atsushi Akisawa Kazumichi ARAKI Takahiko Miyazaki Yuki UEDA Toshitaka Takei

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[In Japanese. / En japonais.]

Kunihiko Nakajima Toshitaka Takei

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Simulation Analysis of the NH 3 -H 2 O Two-Stage Desorption Type Absorption Refrigerator Driven by Low Grade Waste Heat

Revista Trace (2011)

Toshitaka Takei Shinji Kimijima Kiyoshi Saito Sunao Kawai

Absorption refrigerator

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419 Heat Transportation at Ambient Temperature Based on Ammonia-water Absorption Heat Pump : Experimental Investigation of Heat Transportation Performance

The Proceedings of the Symposium on Environmental Engineering (2009)

Atsushi Akisawa Atsushi Takata Kazumichi ARAKI Toshitaka Takei Kenichiro Watanabe

Utilizing wasted heat is a important issue to reduce primary fuel consumption. Because wasted heat sources are located far from heat demand, it is required to transport thermal energy efficiently. The objective of this study is to investigate the performance of heat transportation and conversion based on absorption heat pump mechanism with ammonia-water as the working fluid experimentally. The test rig incorporates an external heat exchanger to cool high temperature weak solution from the generator in order to emulate transporting working fluid without thermal insulation. The experiment indicates the proposed system can transport thermal energy at ambient temperature and the function of heat transportation does not affect the efficiency of the cycle.

Renewable heat

Coefficient of performance

Thermal energy

10.1299/jsmeenv.2009.19.395

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418 Heat storage by solution concentration difference based on absorption chiller cycle with ammonia/water

The Proceedings of the Symposium on Environmental Engineering (2013)

Kaoru Hirayama Atsushi Akisawa Yuki UEDA Kazumichi ARAKI Toshitaka Takei

Ammonia-water absorption refrigeration cycle converts thermal energy input into concentration difference of the refrigerant in solutions, then produces cooling. In the proposed system, refrigerant weak solution and strong solution are separately stored in tanks, which works as heat storage. This study investigated the feasibility of solution storage for thermal storage by dynamical simulation and examined the actual performance of heat release process experimentally. When separated refrigerant and weak solution were put into the evaporator and the absorber respectively cooling effect was observed to have almost steady output. It was also found that the cooling effect clearly depended on the mass flow rate of the refrigerant, which suggests that the heat release process is dominated by mass transfer, not heat transfer. The results reveal that solution storage functions as thermal storage definitely.

Chiller

Absorption refrigerator

10.1299/jsmeenv.2013.23.324

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Evaluation of Enthalpy Diagrams for NH 3 -H 2 O Absorption Refrigerator

Revista Trace (2011)

Toshitaka Takei Kiyoshi Saito Sunao Kawai

Absorption refrigerator

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420 Heat Transportation at Ambient Temperature based on Ammonia-Water Absorption Heat Pump : Computational Investigation of Heat Transportation Performance

The Proceedings of the Symposium on Environmental Engineering (2009)

Atsushi Takata Atsushi Akisawa Takahiko Miyazaki Yuki UEDA Kazumichi ARAKI

The ammonia-water absorption heat pump utilizing waste heat is effective for energy saving. However, it is usual that the heat demand area is away from the heat supply area. Solution Transportation type Absorption system ; STA is one of the heat transportation technology. This system transfers ammonia refrigerant, strong and weak solutions from remote heat source side to heat demand side over long distance. In other words, thermal energy is converted into chemical potential and transferred to the other side. From simulation, it was found that STA worked with almost the same efficiency as conventional ammonia absorption heat pump.

Absorption heat pump

Renewable heat

10.1299/jsmeenv.2009.19.399

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SUBTROPICAL COMPRESSED AIR ENERGY STORAGE RELATING TO SITING FREE AND HIGH EFFICIENT CAES-GT SYSTEM COMBINED WITH BY-PRODUED ICE AND ENERGY SAVED DEEP DESALINATION

Motoya Hayashi H. Kobayashi Toshitaka Takei Morikatsu SAKURADA

Compressed air

10.1142/9789812791924_0022

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452 Investigation on Ammonia Absorption Refrigerator with low-refrigerant mass fraction

The Proceedings of the Symposium on Environmental Engineering (2005)

Yasuyuki KINOHITA Eiji NISHIWAKI Keisuke Takeshita Yoshiharu AMANO Takumi HASHIZUME

Ammonia absorption refrigerator is an energy conservation equipment that can be driven by waste heat comes from primary generators in cascade. Some of the challenges for the ammonia absorption refrigerator are high efficiency, low-cost, and lowering the heat source temperature. The authors have been shown that lowering the ammonia mass fraction of the refrigerant makes the heat source temperature. This paper reports some results of experimental investigations on an ammonia absorption refrigerator to confirm the validity of our theory. The experimental refrigerator is a single-stage absorption refrigerator of 350[kW] cooling capacity. The rating heat source temperature is 161[℃] and the refrigerant mass fraction is 99.8% at the top of the rectifying column. Experimental investigations are carried out with a parameter of the temperature at the top of the rectifying column which determine the ammonia mass fraction of the refrigerant.

Absorption refrigerator

Mass fraction

Fraction (chemistry)

10.1299/jsmeenv.2005.15.511

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Experimental Investigations on the Characteristics of the Ammonia-Water Absorption Refrigerator for Low Temperature Solution Cycle

Revista Trace (2011)

Toshitaka Takei Shinji Kimijima Kiyoshi Saito Sunao Kawai

Absorption refrigerator

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