liu.seSök publikationer i DiVA
Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Model Based Diagnosis of an Air Source Heat Pump
Linköpings universitet, Institutionen för systemteknik, Fordonssystem.
2011 (Engelska)Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)Alternativ titel
Modellbaserad Diagnos av en Luftvärmepump (Svenska)
Abstract [en]

The purpose of a heat pump is to control the temperature of an enclosed space. This is done by using heat exchange with a heat source, for example water, air, or ground. In the air source heat pump that has been studied during this master thesis, a refrigerant exchanges heat with the outdoor air and with a water distribution system.

The heat pump is controlled through the circuit containing the refrigerant and it is therefore crucial that this circuit is functional. To ensure this, a diagnosis system has been created, to be able to detect and isolate sensor errors. The diagnosis system is based on mathematical models of the refrigerant circuit with its main components: a compressor, an expansion valve, a plate heat exchanger, an air heat exchanger, and a four-way valve. Data has been collected from temperature- and pressure sensors on an air source heat pump. The data has then been divided into data for model estimation and data for model validation. The models are used to create test quantities, which in turn are used by a diagnosis algorithm to determine whether an error has occurred or not.

There are nine temperature sensors and two pressure sensors on the studied air source heat pump. Four fault modes have been investigated for each sensor: Stuck, Offset, Short circuit and Open circuit. The designed diagnosis system is able to detect all of the investigated error modes and isolate 40 out of 44 single errors. However, there is room for improvement by constructing more test quantities to detect errors and decouple more fault modes. To further develop the diagnosis system, the existing models can be improved and new models can be created.

Ort, förlag, år, upplaga, sidor
2011. , s. 40
Nyckelord [en]
modelling, diagnosis, vapour compression system
Nationell ämneskategori
Annan elektroteknik och elektronik
Identifikatorer
URN: urn:nbn:se:liu:diva-71423ISRN: LiTH-ISY-EX--11/4502--SEOAI: oai:DiVA.org:liu-71423DiVA, id: diva2:448339
Ämne / kurs
Examensarbete i Fordonssystem
Uppsök
fysik/kemi/matematik
Handledare
Examinatorer
Tillgänglig från: 2011-10-17 Skapad: 2011-10-16 Senast uppdaterad: 2011-10-17Bibliografiskt granskad

Open Access i DiVA

fulltext(1023 kB)10374 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 1023 kBChecksumma SHA-512
54bf38dc98cf22ef02e71681d7e8760216f486cf4a1e59642e2639bbef66c6f6bbea56b9f4643234021cc7a81cc63f3da548b6f5139034bf4eb6db2b5a757dc9
Typ fulltextMimetyp application/pdf

Av organisationen
Fordonssystem
Annan elektroteknik och elektronik

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 10374 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

urn-nbn

Altmetricpoäng

urn-nbn
Totalt: 678 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf