Cai, Hanmin

You, Shi

Low‐temperature district heating (LTDH) has been proposed to reduce heat loss and facilitate renewable energy integration. Yet, LTDH alone is insufficient for domestic water heating, which requires 50 °C for circulation and 60 °C as set point temperature for the storage tank due to hygiene concern. The engineering solution to address this is to complement existing system with heat booster. It is expected to be a widespread coupling across power system and district heating system and represents the flexibility to support integrated energy system operation. Our work is based on this paradigm shift in the research of integrated energy system and this abstract presents partly the results from reference [1]. We based our work on real system in Copenhagen’s Nordhavn area, as a part of the large demonstration project ‐ EnergyLab Nordhavn. The analysis on fuel shift technology shows substantial benefits and the potential to provide more services in an integrated energy system. It was based on a district terraced single‐family houses supplied by both a low‐temperature district heating (LTDH) network and a low‐voltage network (LVN). A real example is illustrated in Fig. 1. It was shown that district heating network (DHN) losses could be reduced by 35% if the supply temperature is reduced from 70 °C to 50 °C, but the LVN peak power will have to be increased by up to 2% using heat boosting. It further aggregated EHBs to provide a fuel shift (FS) service for the DHN. The results show that while LVN peak power was increased by up to 4.3%, the basic power production and peak boiler usage for DHN could be reduced by as much as 15% and 48%, respectively. In summary, lower supply temperatures and intelligent components can improve system efficiency and turn the DHN into an integrated part of a SES

Online Research Database In Technology

  General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.   Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal  If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.         Downloaded from orbit.dtu.dk on: Mar 29, 2019Improving urban energy system operation with flexible heat and power couplingCai, Hanmin; You, ShiPublication date:2018Document VersionPublisher's PDF, also known as Version of recordLink back to DTU OrbitCitation (APA):Cai, H., & You, S. (2018). Improving urban energy system operation with flexible heat and power coupling.Abstract from Sustain conference 2018: Creating Technology for a Sustainable Society, Kongens Lyngby,Denmark.     Improving	urban	 energy	 system	 operation	with	 flexible	heat	 and	 power	coupling Hanmin Cai1, Shi You1 1: Department of Electrical engineering, Technical University of Denmark *Corresponding author email: hacai@elektro.dtu.dk Low‐temperature district heating  (LTDH) has been proposed to  reduce heat  loss and  facilitate  renewable energy  integration.  Yet,  LTDH  alone  is  insufficient  for  domestic  water  heating,  which  requires  50  °C  for circulation and 60 °C as set point temperature for the storage tank due to hygiene concern. The engineering solution to address this is to complement existing system with heat booster. It is expected to be a widespread coupling across power system and district heating system and represents the flexibility to support integrated energy  system operation. Our work  is  based on  this  paradigm  shift  in  the  research of  integrated energy system and this abstract presents partly the results from reference [1]. We based our work on real system in Copenhagen’s Nordhavn area, as a part of the large demonstration project ‐ EnergyLab Nordhavn. The analysis on fuel shift technology shows substantial benefits and the potential to provide more services in an integrated energy system. It was based on a district terraced single‐family houses supplied by both a low‐temperature  district  heating  (LTDH)  network  and  a  low‐voltage  network  (LVN).  A  real  example  is illustrated in Fig. 1. It was shown that district heating network (DHN) losses could be reduced by 35% if the supply temperature is reduced from 70 °C to 50 °C, but the LVN peak power will have to be increased by up to 2% using heat boosting. It further aggregated EHBs to provide a fuel shift (FS) service for the DHN. The results show that while LVN peak power was increased by up to 4.3%, the basic power production and peak boiler usage for DHN could be reduced by as much as 15% and 48%, respectively. In summary, lower supply temperatures and intelligent components can improve system efficiency and turn the DHN into an integrated part of a SES.                       Fig 1. Building’s connection to heat and power system                 Fig 2. Field demonstration    [1] Cai, H., You, S., Wang, J., Bindner, H.W. and Klyapovskiy, S., 2018. Technical assessment of electric heat boosters  in  low‐temperature  district  heating  based  on  combined  heat  and  power  analysis.  Energy,  150, pp.938‐949. 

Improving urban energy system operation with flexible heat and power coupling

http://orbit.dtu.dk/ws/files/161879437/Sustain_abstract_Hanmin.pdf

Improving urban energy system operation with flexible heat and power coupling

Abstract

Similar works

Full text

Available Versions

Online Research Database In Technology