The Effect Of Pressure On Rankin Cycle - amazonia.fiocruz.br

The Effect Of Pressure On Rankin Cycle Video

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In the latter case, please turn on Javascript support in your web browser and reload this page. Waste heat recovery systems have click been designed based on engine rated working conditions, while engines often operate under part load conditions. Hence, it is quite important to analyze the off-design performance of ORC systems under different engine loads. The sliding pressure control method is applied to balance the variation of system parameters and evaporating Presure is chosen as the operational variable. The effect of operational variable and engine load on system performance is analyzed from the aspects of energy and exergy.

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Considering the contributions of components to total exergy destruction, the proportions of the gas-oil exchanger and turbine increase, while the proportions of the evaporator and condenser decrease with the drop of engine load. At present, increasing global concerns over climate change and energy shortages link resulted in a strong interest in energy development.

In China, improving the proportion of natural gas NG in the read article energy mix is the TThe energy conservation and emission reduction strategy in the near future [ 1 ]. Natural gas, which is always used in distributed energy systems DESs and combined cold, heat and power CCHPwill become the major energy suppliers for industrial parks and new towns.

The conversion of exhaust waste heat into useful output is a promising approach which will improve overall thermal efficiency and save fuel. Previous researchers have shown that among the Ths techniques for residual energy utilization, the Organic Rankine Cycle ORC is a promising method for engine waste heat recovery [ 34 ]. Extensive studies had been conducted on waste heat recovery of internal combustion engines ICEs using ORC, including working fluid selection [ 567 ], cycle configuration [ 78 ] and economic analysis [ 910 ]. The Effect Of Pressure On Rankin Cycle, previous studies focused on the design conditions and carry out simulations based on simple thermodynamic models, whereas ORC systems fed by engine waste heat often operate far from their design point due to the changes of engine load.

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Previous research has shown that the available exhaust gas energy varies greatly depending on engine loads [ 81112 ]. In fact, the exhaust gas flow rate and temperature variations lead the evaporator to severe off-design conditions which modify the inlet working fluid conditions until the ORC system becomes unfeasible [ 13 ].

The importance of investigating the off-design performance of ORC systems with variable engine conditions was remarked by Wang et al. The stationary ICE would operate at off-design conditions when the electrical power demand decreases. According to the electricity load profiles of different buildings in a typical day [ 15 ], it is confirmed that the stationary ICE would also operate at off-design conditions for long periods of time. Regarding this, only a few works in the published literature have click the off-design performance of ORC systems.

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Sun Ob Li [ 16 ] proposed a detailed off-design model of an ORC to predict system performance, and their optimization study revealed the relationship between controlled optimal relative working fluid mass flow rate, the optimal relative condenser fan air mass flow rate and uncontrolled variables the heat source temperature and the Cyclee dry bulb temperature on maximal net power output and thermal efficiency. Ibarra et al. The part-load model can simulate the off-design conditions with the variation Pressurs four parameters: the maximum temperature of the cycle, the evaporation pressure, The Effect Of Pressure On Rankin Cycle condensation temperature and the expander speed. However, the attention of the authors was only focused to the off-design performance of the expander and pump without considering the off-design simulation of the vapor generator, the heat source and the condensation system. Wang et al. Hu et al.

Quolin et al. The study of Bamgbopa et al. In summary, the above The Effect Of Pressure On Rankin Cycle mainly focused on medium-low temperature ORC systems, such as solar and geothermal powered ORC systems. If the organic working fluids are directly heated by the exhaust gas, it may cause local overheating and decomposition problems. In this case, the medium cycle MCan intermediate heat-transfer loop, is generally adopted to lower the exhaust temperature and ensure the safety of the working fluid [ 22 ]. The result of Li [ 23 ] showed that MC can improve the stability of ORC systems and turn all step changes into ramp changes, which makes control system more effective and robust.

Gewald [ 22 ] applied an ORC with a thermal-oil cycle to recover the waste heat of several large stationary engines. The importance of medium cycle to transfer heat from exhaust gas to an ORC Ranlin was also noted by Vaja [ 24 ]. MC cycles can also be found in [ 252627 ]. Previous studies stated that MC cycles can not only inhibit the thermal decomposition of working fluids, but also stabilize the operation of the ORC system under transient conditions.

Rfa is selected as working fluid due to its being non-flammable and non-toxic and having relatively low environmental impact low ODP and low GWP. The off-design system model is built by assembling the models of each component through the inlet and outlet state.]