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Control of decentralised solar district heating

Lennermo, Gunnar; Lauenburg, Patrick LU and Werner, Sven (2019) In Solar Energy 179. p.307-315
Abstract

The purpose of decentralised solar district heating plants is to feed solar heat directly into district heating networks. This decentralised heat supply has to consider two major output conditions: a stable required feed-in supply temperature and a feed-in heat power equal to the heat output from the solar collectors. However, many installations cannot achieve the second output condition, since severe oscillations appear in the feed-in heat power. This problem can be solved by two different control concepts with either temperature- or flow-control. Detailed measurements from two reference plants are provided for these two different control concepts. One main conclusion is that a robust control system is characterized by the ability to... (More)

The purpose of decentralised solar district heating plants is to feed solar heat directly into district heating networks. This decentralised heat supply has to consider two major output conditions: a stable required feed-in supply temperature and a feed-in heat power equal to the heat output from the solar collectors. However, many installations cannot achieve the second output condition, since severe oscillations appear in the feed-in heat power. This problem can be solved by two different control concepts with either temperature- or flow-control. Detailed measurements from two reference plants are provided for these two different control concepts. One main conclusion is that a robust control system is characterized by the ability to provide required flows and temperatures. The major difference between robust and less robust control is that the supply temperatures and/or flows do not fluctuate even if the input conditions are unfavourable.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Control strategy, District heating, Feed-in systems, Prosumers, Solar thermal
in
Solar Energy
volume
179
pages
9 pages
publisher
Elsevier
external identifiers
  • scopus:85059474876
ISSN
0038-092X
DOI
10.1016/j.solener.2018.12.080
language
English
LU publication?
yes
id
0b0332c0-ca2c-47a4-8405-c5776969da6f
date added to LUP
2019-01-11 08:34:15
date last changed
2019-02-20 11:42:36
@article{0b0332c0-ca2c-47a4-8405-c5776969da6f,
  abstract     = {<p>The purpose of decentralised solar district heating plants is to feed solar heat directly into district heating networks. This decentralised heat supply has to consider two major output conditions: a stable required feed-in supply temperature and a feed-in heat power equal to the heat output from the solar collectors. However, many installations cannot achieve the second output condition, since severe oscillations appear in the feed-in heat power. This problem can be solved by two different control concepts with either temperature- or flow-control. Detailed measurements from two reference plants are provided for these two different control concepts. One main conclusion is that a robust control system is characterized by the ability to provide required flows and temperatures. The major difference between robust and less robust control is that the supply temperatures and/or flows do not fluctuate even if the input conditions are unfavourable.</p>},
  author       = {Lennermo, Gunnar and Lauenburg, Patrick and Werner, Sven},
  issn         = {0038-092X},
  keyword      = {Control strategy,District heating,Feed-in systems,Prosumers,Solar thermal},
  language     = {eng},
  pages        = {307--315},
  publisher    = {Elsevier},
  series       = {Solar Energy},
  title        = {Control of decentralised solar district heating},
  url          = {http://dx.doi.org/10.1016/j.solener.2018.12.080},
  volume       = {179},
  year         = {2019},
}