Improving heat measurement accuracy in district heating substations
The idea of district heating is to heat up a whole district from a central source through a distribution network. The heat is extracted by heat exchangers and the water is then subsequently returned to the central source. The heat exchange between the district heating network and the building occurs...
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Luleå tekniska universitet, EISLAB
2006
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ftluleatu:oai:DiVA.org:ltu-26509 2023-05-15T17:09:17+02:00 Improving heat measurement accuracy in district heating substations Jomni, Yassin 2006 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26509 eng eng Luleå tekniska universitet, EISLAB Luleå Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, 1402-1544 2006:54 http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26509 Local e95a5420-d6d9-11db-8550-000ea68e967b info:eu-repo/semantics/openAccess Other Electrical Engineering Electronic Engineering Information Engineering Annan elektroteknik och elektronik Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2006 ftluleatu 2022-10-25T20:53:47Z The idea of district heating is to heat up a whole district from a central source through a distribution network. The heat is extracted by heat exchangers and the water is then subsequently returned to the central source. The heat exchange between the district heating network and the building occurs in district heating substations. Heat meters are located in such substations and are divided into two main categories depending on their heat energy estimation frequency modes. Which are either constant or flow rate dependent. The Swedish district heating industry is a business with revenue of approximately 19.8 billion SEK (as of the year 2002). Considering an error of 1% in energy delivered, that is a loss of 198 million SEK, which justifies the current research. The accuracy in heat measurement for billing purposes is then one of the major reasons for conducting this research. Few studies have been done in this area. A Swedish study shows that the major causes of the errors are: flow meters, temperature sensors, integrating units, lightning, control systems, valves, leaks in heat exchangers and the dynamic heat demand imposed on the district heating substation. I have chosen to study the heat measurement errors due to dynamic load imposed on the district heating substation because they are the least investigated and presumably account for a substantial portion of the total error. I have delimited my research area to include single family houses, since the effects of dynamic heat load on heat metering are more important in this kind of dwelling. A major tool in the investigation has been simulations based on a Simulink model, of a district heating substation and a house. For this purpose, the simulation model has been extended to handle new heat measurement strategies. A district heating laboratory was built at Luleå University of Technology to test not only the accuracy of different heat measurement algorithms but also control and diagnosis methods. Based on analysis of the measurement strategies, an adaptive ... Doctoral or Postdoctoral Thesis Luleå Luleå Luleå Luleå University of Technology Publications (DiVA) Billing ENVELOPE(160.900,160.900,-75.717,-75.717) |
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Luleå University of Technology Publications (DiVA) |
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ftluleatu |
language |
English |
topic |
Other Electrical Engineering Electronic Engineering Information Engineering Annan elektroteknik och elektronik |
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Other Electrical Engineering Electronic Engineering Information Engineering Annan elektroteknik och elektronik Jomni, Yassin Improving heat measurement accuracy in district heating substations |
topic_facet |
Other Electrical Engineering Electronic Engineering Information Engineering Annan elektroteknik och elektronik |
description |
The idea of district heating is to heat up a whole district from a central source through a distribution network. The heat is extracted by heat exchangers and the water is then subsequently returned to the central source. The heat exchange between the district heating network and the building occurs in district heating substations. Heat meters are located in such substations and are divided into two main categories depending on their heat energy estimation frequency modes. Which are either constant or flow rate dependent. The Swedish district heating industry is a business with revenue of approximately 19.8 billion SEK (as of the year 2002). Considering an error of 1% in energy delivered, that is a loss of 198 million SEK, which justifies the current research. The accuracy in heat measurement for billing purposes is then one of the major reasons for conducting this research. Few studies have been done in this area. A Swedish study shows that the major causes of the errors are: flow meters, temperature sensors, integrating units, lightning, control systems, valves, leaks in heat exchangers and the dynamic heat demand imposed on the district heating substation. I have chosen to study the heat measurement errors due to dynamic load imposed on the district heating substation because they are the least investigated and presumably account for a substantial portion of the total error. I have delimited my research area to include single family houses, since the effects of dynamic heat load on heat metering are more important in this kind of dwelling. A major tool in the investigation has been simulations based on a Simulink model, of a district heating substation and a house. For this purpose, the simulation model has been extended to handle new heat measurement strategies. A district heating laboratory was built at Luleå University of Technology to test not only the accuracy of different heat measurement algorithms but also control and diagnosis methods. Based on analysis of the measurement strategies, an adaptive ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Jomni, Yassin |
author_facet |
Jomni, Yassin |
author_sort |
Jomni, Yassin |
title |
Improving heat measurement accuracy in district heating substations |
title_short |
Improving heat measurement accuracy in district heating substations |
title_full |
Improving heat measurement accuracy in district heating substations |
title_fullStr |
Improving heat measurement accuracy in district heating substations |
title_full_unstemmed |
Improving heat measurement accuracy in district heating substations |
title_sort |
improving heat measurement accuracy in district heating substations |
publisher |
Luleå tekniska universitet, EISLAB |
publishDate |
2006 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26509 |
long_lat |
ENVELOPE(160.900,160.900,-75.717,-75.717) |
geographic |
Billing |
geographic_facet |
Billing |
genre |
Luleå Luleå Luleå |
genre_facet |
Luleå Luleå Luleå |
op_relation |
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, 1402-1544 2006:54 http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26509 Local e95a5420-d6d9-11db-8550-000ea68e967b |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766065324369641472 |