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Title: The reservoir network: A new network topology for district heating and cooling

Abstract

Thermal district networks are effective solutions to substitute fossil fuels with renewable energy sources for heating and cooling. Moreover, thermal networking of buildings allows energy efficiency to be further increased. The waste heat from cooling can be reused for heating in thermal district systems. Because of bidirectional energy flows between prosumers, thermal networks require new hydraulic concepts. In this work, we present a novel network topology for simultaneous heating and cooling: the reservoir network. The reservoir network is robust in operation due to hydraulic decoupling of transfer stations, integrates heat sources and heat sinks at various temperature levels and is flexible in terms of network expansion. Furthermore, we used Modelica simulations to compare the new single-pipe reservoir network to a basecase double-pipe network, taking yearly demand profiles of different building types for heating and cooling. The electric energy consumed by the heat pumps and circulations pumps differs between the reservoir and base case networks by less than 1%. However, if the reservoir network is operated with constant instead of variable mass flow rate, the total electrical consumption can increase by 48% compared to the base case. As with any other network topology, the design and control of such networks ismore » crucial to achieving energy efficient operation. Investment costs for piping and trenching depend on the district layout and dimensioning of the network. If a ring layout is applied in a district, the reservoir network with its single-pipe configuration is more economical than other topologies. For a linear layout, the piping costs are slightly higher for the reservoir network than for the base case because of larger pipe diameters.« less

Authors:
 [1];  [2];  [3];  [1];  [3];  [1]
  1. Lucerne Univ. of Applied Sciences and Arts, Horw (Switzerland). Inst. of Building Technology and Energy
  2. Swiss Federal Laboratories for Materials Science and Technology (Empa), Dübendorf, (Switzerland)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1782147
Alternate Identifier(s):
OSTI ID: 1703622
Grant/Contract Number:  
AC02-05CH11231; AC02- 05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Energy (Oxford)
Additional Journal Information:
Journal Name: Energy (Oxford); Journal Volume: 199; Journal ID: ISSN 0360-5442
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; district heating networks; district cooling networks; modelica; prosumer; reservoir network; piping costs

Citation Formats

Sommer, Tobias, Sulzer, Matthias, Wetter, Michael, Sotnikov, Artem, Mennel, Stefan, and Stettler, Christoph. The reservoir network: A new network topology for district heating and cooling. United States: N. p., 2020. Web. https://doi.org/10.1016/j.energy.2020.117418.
Sommer, Tobias, Sulzer, Matthias, Wetter, Michael, Sotnikov, Artem, Mennel, Stefan, & Stettler, Christoph. The reservoir network: A new network topology for district heating and cooling. United States. https://doi.org/10.1016/j.energy.2020.117418
Sommer, Tobias, Sulzer, Matthias, Wetter, Michael, Sotnikov, Artem, Mennel, Stefan, and Stettler, Christoph. Thu . "The reservoir network: A new network topology for district heating and cooling". United States. https://doi.org/10.1016/j.energy.2020.117418. https://www.osti.gov/servlets/purl/1782147.
@article{osti_1782147,
title = {The reservoir network: A new network topology for district heating and cooling},
author = {Sommer, Tobias and Sulzer, Matthias and Wetter, Michael and Sotnikov, Artem and Mennel, Stefan and Stettler, Christoph},
abstractNote = {Thermal district networks are effective solutions to substitute fossil fuels with renewable energy sources for heating and cooling. Moreover, thermal networking of buildings allows energy efficiency to be further increased. The waste heat from cooling can be reused for heating in thermal district systems. Because of bidirectional energy flows between prosumers, thermal networks require new hydraulic concepts. In this work, we present a novel network topology for simultaneous heating and cooling: the reservoir network. The reservoir network is robust in operation due to hydraulic decoupling of transfer stations, integrates heat sources and heat sinks at various temperature levels and is flexible in terms of network expansion. Furthermore, we used Modelica simulations to compare the new single-pipe reservoir network to a basecase double-pipe network, taking yearly demand profiles of different building types for heating and cooling. The electric energy consumed by the heat pumps and circulations pumps differs between the reservoir and base case networks by less than 1%. However, if the reservoir network is operated with constant instead of variable mass flow rate, the total electrical consumption can increase by 48% compared to the base case. As with any other network topology, the design and control of such networks is crucial to achieving energy efficient operation. Investment costs for piping and trenching depend on the district layout and dimensioning of the network. If a ring layout is applied in a district, the reservoir network with its single-pipe configuration is more economical than other topologies. For a linear layout, the piping costs are slightly higher for the reservoir network than for the base case because of larger pipe diameters.},
doi = {10.1016/j.energy.2020.117418},
journal = {Energy (Oxford)},
number = ,
volume = 199,
place = {United States},
year = {2020},
month = {3}
}

Works referenced in this record:

European space cooling demands
journal, September 2016


District heating and cooling systems – Framework for Modelica-based simulation and dynamic optimization
journal, October 2017


4th Generation District Heating (4GDH)
journal, April 2014


5th generation district heating and cooling systems: A review of existing cases in Europe
journal, April 2019

  • Buffa, Simone; Cozzini, Marco; D’Antoni, Matteo
  • Renewable and Sustainable Energy Reviews, Vol. 104
  • DOI: 10.1016/j.rser.2018.12.059

Optimal transformation strategies for buildings, neighbourhoods and districts to reach CO2 emission reduction targets
journal, January 2020


International review of district heating and cooling
journal, October 2017


Modelica Buildings library
journal, March 2013

  • Wetter, Michael; Zuo, Wangda; Nouidui, Thierry S.
  • Journal of Building Performance Simulation, Vol. 7, Issue 4
  • DOI: 10.1080/19401493.2013.765506

Development of a topology analysis tool for fifth-generation district heating and cooling networks
journal, September 2019


Optimisation of a district energy system with a low temperature network
journal, October 2017


Modelica - An International Effort to Design the Next Generation Modeling Language
journal, April 1997


District heating and cooling: Review of technology and potential enhancements
journal, May 2012


Heat Roadmap Europe: Identifying the balance between saving heat and supplying heat
journal, November 2016


Dynamic modeling of local district heating grids with prosumers: A case study for Norway
journal, May 2018


Control of decentralised solar district heating
journal, February 2019


Environmental Comparison of Energy Solutions for Heating and Cooling
journal, December 2019

  • Franzén, Ida; Nedar, Linnéa; Andersson, Maria
  • Sustainability, Vol. 11, Issue 24
  • DOI: 10.3390/su11247051

The status of 4th generation district heating: Research and results
journal, December 2018


Integrated model for comparison of one- and two-pipe ground-coupled heat pump network configurations
journal, September 2017

  • Gagné-Boisvert, Laurent; Bernier, Michel
  • Science and Technology for the Built Environment, Vol. 24, Issue 7
  • DOI: 10.1080/23744731.2017.1366184

Heat Roadmap Europe: Combining district heating with heat savings to decarbonise the EU energy system
journal, February 2014


A thermodynamic analysis of a novel bidirectional district heating and cooling network
journal, February 2018