| Summary: | 碩士 === 國立交通大學 === 機械工程系所 === 105 === The purpose of this study is to simulate the system performance of ORC (organic Rankine cycle) system subject to changes of externally environmental conditions. The external environmental conditions includes changes of inlet temperature of heat and cold source, mass flow rate of heat and cold source, pump rotation speed. The major differences between the present study and others are that no extra constraints such as given high pressure or low pressure are imposed initially. Typical simulations from the literatures normally fix high pressure and low pressure of system or superheated temperature of refrigerant. Instead, the only constraint in this study is the amount of inventory of working fluids. With this help of the present ORC program, the associated temperature and pressure in the system will be obtained.
The result shows that reducing inlet temperature of cold source, increasing the mass flow rate of cold source or increasing the tube length of evaporator and condenser at the situation of fixed pump rotation speed are proper way will improve the system performance. In addition, when the rotation speed of pump raises, the power of expander and thermal efficiency of system is also higher than the original design.
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