Transition to low temperature distribution in existing systems

Miika Rämä, Kari Sipilä

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

One key aspect of the 4th generation district heating systems [1] is a low temperature solution for distribution - i.e. the supply temperature in the distribution network is set to a lower level (30-70 °C, depending on design) than traditionally (80-115 °C). The temperature level has a defining impact on the efficiency of the distribution through heat losses and it improves the potential for integrating new sources of heat into the system. These new heat sources include heat pumps, renewable energy sources and excess heat from communities and industry. Combined heat and power (CHP) production and boiler based heat supply benefit from a lower temperature level as well. At the same time the transition to lower temperature level imposes challenges on pipe capacities within the distribution network, heat exchanger and secondary side design and heat distribution systems within buildings. While low temperature distribution is simply a design choice for new systems, refurbishing existing systems is much less straightforward and a current challenge in countries with developed district heating systems. Although technically feasible, the changes needed should be studied on a system level for a throughout evaluation of the cost-efficiency in terms of both energy savings and emissions. The needed investment and the benefits can end up to be unevenly distributed among the involved parties, e.g. the local utility and customers. This can represent a practical barrier impeding or blocking the transition process. This paper studies the effects and impacts of the transition to low temperature distribution in existing district heating systems, the needed technical solutions and the improved potential of utilising new, enabled heat sources. A systematic method and tools for evaluating the system level benefits of the transition are described. This study lays the groundwork for a system specific case study of a major refurbishment of an existing district heating system.
Original languageEnglish
Pages (from-to)58-68
Number of pages11
JournalEnergy Procedia
Volume116
Issue numberJune
DOIs
Publication statusPublished - 1 Jan 2017
MoE publication typeA1 Journal article-refereed
Event15th International Symposium on District Heating and Cooling, DHC15-2016 - Seoul, Korea, Republic of
Duration: 4 Sep 20167 Sep 2016

Fingerprint

Temperature distribution
District heating
Electric power distribution
Temperature
Hot Temperature
Heat losses
Heat exchangers
Boilers
Energy conservation
Pipe
Pumps
Costs
Industry

Keywords

  • 4GDH
  • low temperature district heating

Cite this

Rämä, Miika ; Sipilä, Kari. / Transition to low temperature distribution in existing systems. In: Energy Procedia. 2017 ; Vol. 116, No. June. pp. 58-68.
@article{1588ad0e7985454dbb695ee375715274,
title = "Transition to low temperature distribution in existing systems",
abstract = "One key aspect of the 4th generation district heating systems [1] is a low temperature solution for distribution - i.e. the supply temperature in the distribution network is set to a lower level (30-70 °C, depending on design) than traditionally (80-115 °C). The temperature level has a defining impact on the efficiency of the distribution through heat losses and it improves the potential for integrating new sources of heat into the system. These new heat sources include heat pumps, renewable energy sources and excess heat from communities and industry. Combined heat and power (CHP) production and boiler based heat supply benefit from a lower temperature level as well. At the same time the transition to lower temperature level imposes challenges on pipe capacities within the distribution network, heat exchanger and secondary side design and heat distribution systems within buildings. While low temperature distribution is simply a design choice for new systems, refurbishing existing systems is much less straightforward and a current challenge in countries with developed district heating systems. Although technically feasible, the changes needed should be studied on a system level for a throughout evaluation of the cost-efficiency in terms of both energy savings and emissions. The needed investment and the benefits can end up to be unevenly distributed among the involved parties, e.g. the local utility and customers. This can represent a practical barrier impeding or blocking the transition process. This paper studies the effects and impacts of the transition to low temperature distribution in existing district heating systems, the needed technical solutions and the improved potential of utilising new, enabled heat sources. A systematic method and tools for evaluating the system level benefits of the transition are described. This study lays the groundwork for a system specific case study of a major refurbishment of an existing district heating system.",
keywords = "4GDH, low temperature district heating",
author = "Miika R{\"a}m{\"a} and Kari Sipil{\"a}",
note = "CA2: BA2604 AU2: R{\"a}m{\"a}, Miika AU2: Sipil{\"a}, Kari",
year = "2017",
month = "1",
day = "1",
doi = "10.1016/j.egypro.2017.05.055",
language = "English",
volume = "116",
pages = "58--68",
journal = "Energy Procedia",
issn = "1876-6102",
publisher = "Elsevier",
number = "June",

}

Transition to low temperature distribution in existing systems. / Rämä, Miika; Sipilä, Kari.

In: Energy Procedia, Vol. 116, No. June, 01.01.2017, p. 58-68.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Transition to low temperature distribution in existing systems

AU - Rämä, Miika

AU - Sipilä, Kari

N1 - CA2: BA2604 AU2: Rämä, Miika AU2: Sipilä, Kari

PY - 2017/1/1

Y1 - 2017/1/1

N2 - One key aspect of the 4th generation district heating systems [1] is a low temperature solution for distribution - i.e. the supply temperature in the distribution network is set to a lower level (30-70 °C, depending on design) than traditionally (80-115 °C). The temperature level has a defining impact on the efficiency of the distribution through heat losses and it improves the potential for integrating new sources of heat into the system. These new heat sources include heat pumps, renewable energy sources and excess heat from communities and industry. Combined heat and power (CHP) production and boiler based heat supply benefit from a lower temperature level as well. At the same time the transition to lower temperature level imposes challenges on pipe capacities within the distribution network, heat exchanger and secondary side design and heat distribution systems within buildings. While low temperature distribution is simply a design choice for new systems, refurbishing existing systems is much less straightforward and a current challenge in countries with developed district heating systems. Although technically feasible, the changes needed should be studied on a system level for a throughout evaluation of the cost-efficiency in terms of both energy savings and emissions. The needed investment and the benefits can end up to be unevenly distributed among the involved parties, e.g. the local utility and customers. This can represent a practical barrier impeding or blocking the transition process. This paper studies the effects and impacts of the transition to low temperature distribution in existing district heating systems, the needed technical solutions and the improved potential of utilising new, enabled heat sources. A systematic method and tools for evaluating the system level benefits of the transition are described. This study lays the groundwork for a system specific case study of a major refurbishment of an existing district heating system.

AB - One key aspect of the 4th generation district heating systems [1] is a low temperature solution for distribution - i.e. the supply temperature in the distribution network is set to a lower level (30-70 °C, depending on design) than traditionally (80-115 °C). The temperature level has a defining impact on the efficiency of the distribution through heat losses and it improves the potential for integrating new sources of heat into the system. These new heat sources include heat pumps, renewable energy sources and excess heat from communities and industry. Combined heat and power (CHP) production and boiler based heat supply benefit from a lower temperature level as well. At the same time the transition to lower temperature level imposes challenges on pipe capacities within the distribution network, heat exchanger and secondary side design and heat distribution systems within buildings. While low temperature distribution is simply a design choice for new systems, refurbishing existing systems is much less straightforward and a current challenge in countries with developed district heating systems. Although technically feasible, the changes needed should be studied on a system level for a throughout evaluation of the cost-efficiency in terms of both energy savings and emissions. The needed investment and the benefits can end up to be unevenly distributed among the involved parties, e.g. the local utility and customers. This can represent a practical barrier impeding or blocking the transition process. This paper studies the effects and impacts of the transition to low temperature distribution in existing district heating systems, the needed technical solutions and the improved potential of utilising new, enabled heat sources. A systematic method and tools for evaluating the system level benefits of the transition are described. This study lays the groundwork for a system specific case study of a major refurbishment of an existing district heating system.

KW - 4GDH

KW - low temperature district heating

UR - http://www.scopus.com/inward/record.url?scp=85028616198&partnerID=8YFLogxK

U2 - 10.1016/j.egypro.2017.05.055

DO - 10.1016/j.egypro.2017.05.055

M3 - Article

VL - 116

SP - 58

EP - 68

JO - Energy Procedia

JF - Energy Procedia

SN - 1876-6102

IS - June

ER -