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Status and Prospects of OTEC Integrated with Seawater Desalination in Japan
Yasuyuki Ikegami,Sami Mutair,Takafumi Morisaki 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.11
Oceans cover approximately 71% of the total surface area of earth; hence oceans are considered the biggest solar collectors on earth. Most of the heat energy transferred by sunlight is absorbed by the thin layer of the ocean’s water near the surface. Below this layer, however, the temperature declines gradually with depth. Ocean Thermal Energy Conversion (OTEC) is a system that converts the temperature difference between the surface and the deep waters of the ocean into electricity. In addition, OTEC provides a clean source of fresh water by further utilization of the remaining temperature difference between the seawaters discharging from the power generation plant in driving the desalination process. This paper describes the evolution of OTEC and desalination research in Japan.
박병덕(Byung-Duck Park),이케가미 야스유끼(Yasuyuki Ikegami),모리사끼 따카후미(Takafumi Morisaki) 한국자동차공학회 2013 한국자동차공학회 지부 학술대회 논문집 Vol.2013 No.11
Kalina cycle has the characteristics of the high power generation efficiency, and been actively researched for the power generation system of the low temperature difference. Power generation efficiency of Kalina cycle is higher than that of the organic Rankine cycle in the case of the low temperature heat source. The non-azeotropic mixture of ammonia-water is used as working fluid of Kalina cycle for high power efficiency. In this paper analyzed theoretically the efficiency of the Kalina power generation system in order to determine the availability of the waste heat of an automobile.
수직 평판 유로내 저질량 유속을 갖는 암모니아의 국소 증발 열전달 특성에 관한 연구
이욱현(Wook-Hyun LEE),김정훈(Jeong-Hun KIM),Hirofumi ARIMA,Yasuyuki IKEGAMI 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Plate heat exchangers are the key devices in Ocean Thermal Energy Conversion (OTEC) which is expected as one of the next generation energy source. To realize compact plate evaporator for OTEC, fundamental experiments that investigate the local evaporating heat transfer characteristics of ammonia in vertical flat plate under low mass flux are taken in the present study. The experiments were carried out under the following test conditions; saturated pressure = 0.7 ~ 0.9 ㎫, mass flux = 7.5 ~ 15 ㎏/(㎡ㆍs), heat flux = 15 ~ 25 ㎾/㎡ and test plate inlet quality = 0.1 ~ 0.4 [-]. The results show that the local heat transfer coefficient increases with an increase in quality, while it decrease with an increase in the local heat flux and saturated pressure under prescribed experimental conditions. However, the local heat transfer coefficient is not affected by mass flux. An empirical correlation for local evaporating heat transfer coefficient was also derived.
Yoshitaka Matsuda,Ryoichi Sakai,Takenao Sugi,Satoru Goto,Takeshi Yasunaga,Yasuyuki Ikegami 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
This research investigates the water level control of flash chamber in a spray flash desalination system. First, the water level model is constructed based on the mass conservation law and the thermophysical properties. In this research, not only the flow rate limitation but also the characteristics of valve is taken into account. For the constructed water level model, PI control system is considered. It is verified from simulation results using the PI control system that the control mechanism is suffered from the saturation nonlinearity and the water level has large overshoot. To solve this problem, in this research, an anti-windup compensation is applied. The effectiveness of the control system with anti-windup compensator was confirmed through simulation results.
Daiki Urayoshi,Yoshitaka Matsuda,Takenao Sugi,Satoru Goto,Takafumi Morisaki,Yasuyuki Ikegami 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
In ocean thermal energy conversion (OTEC) plant, electricity is generated by heat energy from temperature difference between warm seawater at surface and cold seawater in depth. OTEC plants have an evaporator as one of the most important devices. Indeed, the evaporator evaporates the working fluid to rotate the turbine connected to the generator. In this research, a model of heat source system in an OTEC pilot plant for stable operation of the plant is constructed. In the OTEC pilot plant, the evaporation of the working fluid is realized by warm water from a boiler. Therefore, it is important to keep the temperature of warm water constant. Since the temperature of warm water can be changed by manipulating the valve opening, first order models to describe the relationship between the temperature and the valve opening are constructed based on experimental data. The effectiveness of the constructed models was verified through simulation.
Yoshitaka Matsuda,Tsukasa Shimada,Takenao Sugi,Satoru Goto,Takafumi Morisaki,Yasuyuki Ikegami 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
This research deals with the design of PI controller for the liquid level control of separator in an ocean thermal energy conversion (OTEC) plant with Uehara cycle by considering some kinds of disturbances. The PI controller is designed for a liquid level model under H∞ constraint. The effectiveness of the designed PI controllers is evaluated through simulations considering disturbances.