Abstract
Near infinite seawater thermal energy, which is considered as an alternative to energy shortage, is expected to be available to 98 countries around the world. Currently, a demonstration plant is being built using closed MW class ocean thermal energy conversion (OTEC). In order to stabilize the operation of the OTEC, automation through a PID control is required. To construct the control system, the control logic is constructed, the algorithm is selected, and each control value is derived. In this paper, we established an optimal control system of a closed OTEC, which is to be demonstrated in Kiribati through simulation, to compare the operating characteristics and to build a system that maintains a superheat of 1 °C or more according to seawater temperature changes. The conditions applied to the simulation were the surface seawater temperature of 31 °C and the deep seawater temperature of 5.5 °C, and the changes of turbine output, flow rate, required power, and evaporation pressure of the refrigerant pump were compared as the temperature difference gradually decreased. As a result of comparing the RPM control according to the selected PID control value, it was confirmed that an error rate of 0.01% was shown in the temperature difference condition of 21.5 °C. In addition, the average superheat degree decreased as the temperature difference decreased, and after about 6000 s and a temperature decrease to 24 °C or less, the average superheat degree was maintained while maintaining the superheat degree of 1.7 °C on average.
Highlights
Energy consumption is increasing as the size of industry increases with the Fourth IndustrialRevolution, and global industrial energy consumption is projected to increase from 222.3 billion Btu in 2012 to 309.1 billion Btu in 2040
The Ocean thermal energy conversion (OTEC) with a PI control was reduced to 1/10 of its potential compared to plant with the change of seawater temperature and applied the Proportional-Integral (PI) control to use without a control [7]
Aa web-based web-based graphical graphical user interface (GUI) was used to visually visually by comparing with the control system of the UEHARA cycle designed in Japan [9,10]
Summary
Energy consumption is increasing as the size of industry increases with the Fourth Industrial. Ocean thermal energy conversion (OTEC) technology generates electricity using a temperature difference between warm water on the ocean’s surface and cold water between 800 and 1000 m deep. Surface water exchanges heat with the working fluid to produce steam that acts to operate the turbine. According to Luis Vega as shown, with economic feasibility in at least◦98 countries [4]. The most common commonpower powergeneration generation method for ocean thermal energy conversion is closedcycle power generation using low-temperature refrigerant as a working fluid. Starting with the cycle OTEC power generation using low-temperature refrigerant as a working fluid. An automated operation according to temperature and flow changes. Figure shows the device configuration model anconfiguration automated operation accordingmarine to temperature and flow changes.
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