Extension of Energy-Utilization Diagram to Power Availability for Exergy Loss Analysis

การขยายผลวิเคราะห์แผนภาพการใช้พลังงานเพื่อเพาเวอร์อะแวลิบิลิตี้และการสูญเสียเอ็กซ์เซอร์ยี

Name: พงศ์ศิริ ตั้งวังวิวัฒน์

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

keyword: Energy-Utilization Diagram (EUD)

; Power Availability Diagram (PAD)

; Exergy Loss Analysis

; Rankine Cycle

; Aspen Plus

Abstract: Energy-Utilization Diagram (EUD) has been utilized to identify exergy lossin a general process unit, whereas PAD provides the difference of exergy changes oftwo pressure exchangers. The aim of this research is to extend the basic concepts ofEUD to PAD and investigate the advantages of the extended PAD. The concepts ofbinary process system and heat exchanger applicability are applied successfully toPAD. Two modifications of the original PAD are proposed for better exergy lossvisualization. Firstly, the energy donor curve is shifted to the location of energyacceptor. Secondly, arrows indicating the exergy change direction are inserted intothe diagram. The modified PAD is named MPAD (Modified Power AvailabilityDiagram). EUD and MPAD routines for a power cycle are constructed in the Excelcalculator block of Aspen Plus (v.10.2). MCPAD (Modified Cycle PowerAvailability Diagram) and MSPAD (Modified Subsystem Power AvailabilityDiagram) are two alternatives of MPAD for the Rankine cycle. MCPAD is the plotthat presents an exergy profile of a working fluid, whereas MSPAD plots the MPADof all units separately in series.Then, the interpretations and characteristics of EUD, MCPAD, andMSPAD are investigated and compared. The overall picture of exergy profile, theexergy change direction, the exergy loss, and the exergy distribution is shownexplicitly in MCPAD. The advantages of MSPAD and EUD are similar to those ofMCPAD but they do not explicitly indicate the exergy profile and exergydistribution. However, the dominant advantage of EUD is the presentation of energydriving force along the energy transfonnation. MSPAD is suitable for a complexprocess since each subsystem is plotted separately. In conclusion, the advantages ofEUD and MPAD for a power cycle are somewhat different. MPAD provides anoverall comprehensive picture of exergy distribution in the cycle, whereas EUDshows the driving force, as well as energy requirement. Therefore, both EUD andMPAD can be simultaneously implemented for exergy loss analysis of a power cycle.

King Mongkut's University of Technology Thonburi. KMUTT Library

Address: BANGKOK

Email: info.lib@mail.kmutt.ac.th

Name: Asst.Prof.Dr. Thongchai Srinophakun

Role: Supervisor

Created: 2544

Issued: 2005-11-03

Modified: 2017-06-16

วิทยานิพนธ์/Thesis

ISBN: 9749550315

CallNumber: CHE1281

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Chemical Engineering

Grantor: King Mongkut's University of Technology Thonburi

©copyrights King Mongkut's University of Technology Thonburi

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