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Development of test environment for Thermia´s heat pumps
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
2007 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Utveckling av en testmiljö för Thermias värmepumpar (Swedish)
Abstract [en]

Thermia Värme AB design and manufacture various heat pump systems for heating, hot water and cooling. This thesis report refers to an examination work carried out during the summer of 2006. The goal was to substitute the current way to test all functions of a heat pumps control system, with a more effective, less time and resource demanding solution.

This work resulted in an attaché case with various electronics that simulate the original NTC-resistors that are used as sensors by the heat pumps control system. The electronics are constructed in such way that the company can choose to conduct the testing mechanically or with a computer using RS-232 communication protocol. This requirement was met by using digital potentiometers. To give the solution more flexibility two separate systems were constructed one that is directly connected with the heat pump system and one acting as a user interface. Communication between these systems was solved with microcontrollers using I 2C protocol.

Abstract [sv]

Thermia Värme AB designar och tillverkar värmepumpsystem för olika ändamål. Denna rapport refererar till det examensarbete som utfördes under sommaren 2006. Syftet med examensarbetet var att effektivisera de testmetoder företaget använde sig av vid testning och verifiering av värmepumparnas styrsystem.

Arbetet resulterade i en attachéväska innehållande elektronik som simulerar de NTC-motstånd som används som givare till värmepumpens styrsystem. Elektroniken är konstruerad på sådant sätt att företaget har möjlighet att utföra tester manuellt eller via RS-232 protokoll samt att ge möjlighet för kommunikation och användning av en extern testmiljö, exempelvis en PC. Detta krävde att digitala potentiometrar användes. För att ge systemet flexibilitet designades två system, där ena är direkt kopplat till värmepumpens styrsystem och det andra agerar som ett användargränssnitt. Dessa system kommunicerar via mikrokontrollers som använder sig av I 2C protokoll.

Place, publisher, year, edition, pages
2007. , 34 p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-96205ISRN: LITH-ITN-EX-07/003--SEOAI: diva2:644768
Subject / course
Automatic Control
Available from: 2013-09-02 Created: 2013-08-14 Last updated: 2013-09-02Bibliographically approved

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Gustafsson, JohanWitkowski, Sebastian
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