A study on performance characteristics and fabrication of a plate heat exchanger condenser for marine Organic Rankine Cycle
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Research on improving the energy efficiency of ships has been conducted in various fields. Accordingly, the application of an Organic Rankine Cycle (ORC) power generation system for ships using exhaust gas-waste heat generated from the main engine is considered. A heat exchanger constituting an ORC system should be designed and manufactured such that it is suitable for stable operation and it is compatible with the system. In this study, to fabricate a plate-type condenser that can be used in a marine ORC system, Computational Fluid Dynamics (CFD) and Aspen Exchanger Design and Rating (EDR) modeling of a condenser designed based on a given single heat-transfer plate shape were compared and reviewed. Consequently, a similar heat-transfer performance between CFD and EDR models was confirmed. EDR condenser modeling was applied, and a basic marine ORC system was constructed and simulated using an R245FA refrigerant as the working fluid. The simulation results confirmed that the ORC system efficiency improved as the cooling-water temperature increased, but the heat-transfer rate of the condenser decreased. The turbine output and ORC system efficiency improved as the turbine inlet pressure increased. In particular, it was confirmed that the ORC system efficiency improved significantly in the range of 10–20 bar, which is a relatively low-pressure region compared with the high-pressure region. Moreover, the ORC system efficiency and heat-transfer rate of the condenser increased as the flow rate of the working fluid of the ORC system increased. In particular, it was confirmed that the liquid fraction in the condenser decreased from a specific flow rate of the working fluid owing to the change in the heat-transfer rate distribution occupied by the sensible and latent heat loads inside the condenser.
Abstract
Research on improving the energy efficiency of ships has been conducted in various fields. Accordingly, the application of an Organic Rankine Cycle (ORC) power generation system for ships using exhaust gas-waste heat generated from the main engine is considered. A heat exchanger constituting an ORC system should be designed and manufactured such that it is suitable for stable operation and it is compatible with the system. In this study, to fabricate a plate-type condenser that can be used in a marine ORC system, Computational Fluid Dynamics (CFD) and Aspen Exchanger Design and Rating (EDR) modeling of a condenser designed based on a given single heat-transfer plate shape were compared and reviewed. Consequently, a similar heat-transfer performance between CFD and EDR models was confirmed. EDR condenser modeling was applied, and a basic marine ORC system was constructed and simulated using an R245FA refrigerant as the working fluid. The simulation results confirmed that the ORC system efficiency improved as the cooling-water temperature increased, but the heat-transfer rate of the condenser decreased. The turbine output and ORC system efficiency improved as the turbine inlet pressure increased. In particular, it was confirmed that the ORC system efficiency improved significantly in the range of 10–20 bar, which is a relatively low-pressure region compared with the high-pressure region. Moreover, the ORC system efficiency and heat-transfer rate of the condenser increased as the flow rate of the working fluid of the ORC system increased. In particular, it was confirmed that the liquid fraction in the condenser decreased from a specific flow rate of the working fluid owing to the change in the heat-transfer rate distribution occupied by the sensible and latent heat loads inside the condenser.
참고문헌 (10)
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