Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Konceptstudie av Waste Heat Recovery System på Tunga Fordon
KTH, School of Engineering Sciences (SCI).
2013 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

In today’s fast growing and closely connected society, a reliable and energy efficient transportation system is more than ever desirable. Nowadays the significant part of the transportation sector’s energy demand is supplied by fossil fuels.

Improving energy efficiency in combustion engines will result in reduction of fuel consumption and CO2 emissions. A modern internal combustion engine has an efficiency of 30-45 %, where the most energy loss occurs as result of heat losses in the exhaust and cooling systems. By recovering and converting the thermal energy of a combustion engine to mechanical/electric power the efficiency of the combustion engine can be increased.

In this work the performance of a truck engine has been investigated with the aim to increase its efficiency by decreasing the heat losses with a Waste Heat Recovery (WHR) system. Intercooler, coolant system, EGR and exhaust systems have been studied for their heat loss potentials.

A model of an ideal Rankine process has been implemented in MATLAB with water as the working fluid. Experimental data sets from a Scania DC1306 and a Volvo D11 engines have served as inputs to the developed MATLAB model. The study shows that an efficiency gain of approximately 2 % can be achieved with a WHR-system where EGR cooler serves as a heat source and 2.5 % with the exhaust as heat source. The combination of both systems can provide an efficiency gain between 4-5 %.

Abstract [sv]

I dagens snabbt växande och energikrävande samhälle är behovet av tillförlitliga och energieffektiva transporterstörre än någonsin önskvärt. En stor del av transportsektorn drivs idag av förbränningsmotorer där energibehovet tillgodoses av fossila bränslen. En energieffektivisering av förbränningsmotorer resultera i minskad bränsleförbrukning och CO2-utsläpp.

Hos en modern förbränningsmotor kan en verkningsgrad på 30-45 % normalt uppnås. Den största energiförlusten utgörs av värmeförluster i avgas och kylsystem. Genom att omvandla förbränningsmotorns termiska förluster till mekanisk eller elektriskt arbete kan verkningsgraden höjas.

I detta arbete undersöks prestandan hos lastbilsmotorn i syfte att höja dess verkningsgrad genom att ta tillvarata värmeförlusterna. Som lösning introduceras ett externt Waste Heat Recovery (WHR) system där Intercooler, kylsystemet, EGR-och avgassystem tillåts agera som potentiella värmekällor.

Systemet beskrivas genom modellering av en ideal Rankineprocess vilket implementerats i MATLAB med vatten som arbetsmedium. Experimentella data från en Scania DC1306 och en Volvo D11 motor har nyttjats som indata till den utvecklade MATLAB-modellen. Studien visar att en effektivitetsvinst på cirka 2 % kan uppnås med ett WHR-system där EGR-kylaren tjänar som värmekälla och 2,5 % med avgaserna som värmekälla. Kombinationen av båda systemen kan åstakomma en effektivitetsvinst mellan 4-5 %.

Place, publisher, year, edition, pages
2013. , 44 p.
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-153935OAI: oai:DiVA.org:kth-153935DiVA: diva2:754073
Educational program
Master of Science in Engineering - Vehicle Engineering
Supervisors
Available from: 2014-10-09 Created: 2014-10-09 Last updated: 2014-10-09Bibliographically approved

Open Access in DiVA

Niklas Nilsson kandidatexam(1189 kB)199 downloads
File information
File name FULLTEXT01.pdfFile size 1189 kBChecksum SHA-512
b36f778fda82cf5b41b2f31771568408bd2142231cf28be7e51f7243b12581478635b3ae6a8991f203e845268a124eba28e57489e35fbcc2cc76d80673f6e07c
Type fulltextMimetype application/pdf

By organisation
School of Engineering Sciences (SCI)
Vehicle Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 199 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 194 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf