Dissertation > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Thermal Engineering Theory

Research of Irreversible Loss in Flow and Mexed Prosess

Author WangYang
Tutor YangYuShun
School Harbin Institute of Technology
Course Thermal Power Engineering
Keywords Irreversible Loss Entropy Generation Dispersion Effect Energy Level Degree of Disorder
Type Master's thesis
Year 2008
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In this thesis,the author has analyzed the reason of irreversible loss in the real process.By applying engineering thermodynamics and statistical thermodynamics, further study flow and mexed irreversible process from the microscopic fields.The main works of the thesis are as follows:By analyzing and calculating the irreversible process in the condenser, find the function of different irreversible factors for irreversible loss and give the measure to decrease irreversible loss.To large-scale system,Analysis the process of electric, geothermal,heat pump for heating and refrigeration equipment,provide some effective advice.The irreversible loss in heat exchanger come from temperature is not equal in the heat transfer process and the friction resistance.In the heat exchanger, there are two main methods which is used to reduce temperature and reduce the flow of fluid in the process of resistance.Through study the specific terms such as the heat exchangers,water-cooled condenser,steam condensers.Find out a lot of factors that is not reversible and irreversible losses in the role played by the impact of irreversible loss of factors such as the import of liquid flow and temperature,the smallest diameter pipe,flow and pressure drop in the number of heat units were analyzed .The microscopic mechanism is the increase of degree of disorder.Meanwhile, derive microscopic formula and apply tow example to demonstrate its exactitude. And find the relation between micro and macro about irreversible loss,and demonstrate the consistence of them.Demonstrate that the way of reducing irreversible loss is to decrease the grown in number of microstate or degree of disorder.

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