Next Article in Journal
Market and Technological Perspectives for the New Generation of Regional Passenger Aircraft
Previous Article in Journal
Design and Evaluation of a Surfactant–Mixed Metal Hydroxide-Based Drilling Fluid for Maintaining Wellbore Stability in Coal Measure Strata
Article Menu

Export Article

Open AccessArticle

Active Management of Heat Customers Towards Lower District Heating Return Water Temperature

Division of Energy Systems, Linköping University, SE-581 83 Linköping, Sweden
*
Author to whom correspondence should be addressed.
Formerly Trygg.
Energies 2019, 12(10), 1863; https://doi.org/10.3390/en12101863
Received: 3 April 2019 / Revised: 26 April 2019 / Accepted: 10 May 2019 / Published: 16 May 2019
(This article belongs to the Section Electrical Power and Energy System)
  |  
PDF [4717 KB, uploaded 21 May 2019]
  |  

Abstract

The traditional way of managing the supply and return water temperatures in a district heating system (DHS) is by controlling the supply water temperature. The return water temperature then becomes a passive result that reflects the overall energy efficiency of the DHS. A DHS with many poorly functioning district heating centrals will create a high return water temperature, and the energy efficiency of the DHS will be affected negatively in several ways (e.g., lower efficiency of the flue gas condenser, higher heat losses in pipes, and lower electricity production for a DHS with combined heat and power (CHP)). With a strategic introduction of low-grade heat customers, the return water temperature can be lowered and, to some extent, controlled. With the heat customers connected in parallel, which is the traditional setup, return water temperatures can only be lowered at the same rate as the heat customers are improved. The active management of some customers can lower the return water temperatures faster and, in the long run, lead to better controlled return water temperatures. Active management is defined here as an adjustment of a domestic heating system in order to improve DHS efficiency without affecting the heating service for the individual building. The opposite can be described as passive management, where heat customers are connected to the DHS in a standardized manner, without taking the overall DHS efficiency into consideration. The case study in this article shows possible efficiency gains for the examined DHS at around 7%. Looking at fuel use, there is a large reduction for oil, with 10–30% reduction depending on the case in question, while the reduction is shown to be largest for the case with the lowest return water temperature. The results also show that efficiency gains will increase electricity production by about 1–3%, and that greenhouse gas (GHG) emissions are reduced by 4–20%. View Full-Text
Keywords: district heating; system perspective; low-grade district heating; return water temperature district heating; system perspective; low-grade district heating; return water temperature
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Rosén, T.; Ödlund, L. Active Management of Heat Customers Towards Lower District Heating Return Water Temperature. Energies 2019, 12, 1863.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top