Energy and exergy analysis of low temperature district heating network

Li, Hongwei; Svendsen, Svend

doi:10.1016/j.energy.2012.03.056

Cited by 139 publications

(64 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In addition, the reservoir was considered to be a cylindrical shape with a thickness of 80 m. Based on the literature research, the supply/return temperature of low-temperature district heating was set at 55/25°C (Li & Svendsen 2012). Nevertheless, when the loss of temperature during fluid transmission was included, the return (injection) temperature was considered to be about 20°C.…”

Section: Static Energy Resources Methodology and Assumptionsmentioning

confidence: 99%

Petrogeothermal energy resources within low-temperature areas of Iceland

Sowiżdżał

Drabik

2016

geol

View full text Add to dashboard Cite

Iceland remains one of the leading countries in the field of the utilization of geothermal energy worldwide. Despite its knowledge and tremendous experience in the exploitation of mostly high-temperature geothermal energy resources (water and steam), it has been interested in the possibility of harnessing heat from hot rock formations with the implementation of the Enhanced Geothermal System (EGS). This paper presents the main outcomes of the feasibility study of EGS technology within the low-temperature area of the country. It includes broad geological research that constitutes the background for finding a suitable site for an EGS installation and to determine the local thermal parameters together with rock characteristics. To calculate the amount of heat stored within the preordained HDR formation and ascertain that the deployment of the EGS within the lowtemperature area of Hólmavík town (NW Iceland) is plausible, the term of static resources of energy was applied. Considering the geological issue, it emerged that within the low-temperature areas of Iceland, there are excellent lithological (mainly porous lava layers) as well as thermal conditions (relatively high heat flow and geothermal gradient values) for the implementation of EGS technology for providing heat for small district heating networks. The amount of energy stored within the designed rock formation turned out to be significant and more than sufficient to cover the energy demands of Hólmavík town. The authors also emphasize the importance of running several exchange programs between Polish and Icelandic research and academic centers, with the indication of possible benefits for the Polish geothermal energy sector.

show abstract

Section: Static Energy Resources Methodology and Assumptionsmentioning

confidence: 99%

Petrogeothermal energy resources within low-temperature areas of Iceland

Sowiżdżał

Drabik

2016

geol

View full text Add to dashboard Cite

show abstract

“…Bypass flows that ensure a high enough supply temperature can cause a high return temperature from the substation, as shown by Crane [17]. Li and Svendsen [18] have performed an exergy analysis of a district heating network, showing that these bypass do indeed cause significant exergy losses. This shows there is a potential for improved bypass controllers.…”

Section: Developing a Theoretical Benchmark For Bypass Controlmentioning

confidence: 99%

A theoretical benchmark for bypass controllers in a residential district heating network

Vandermeulen

Heijde

Patteeuw

et al. 2018

Energy

View full text Add to dashboard Cite

Bypass valves in district heating substations are a compromise between efficiency and quality of service. On the one hand, they are required to ensure that each building (no matter the distance to the heat source) has warm water within an acceptable time. On the other hand, they form a short-circuit between the warm supply and cold return line and their use can increase the return temperature substantially. Therefore, a good control of these bypass valves is critical to limit the drawback of their use. In this context, this paper compares two commonly used control strategies (manual control and thermostat control) to a new theoretical benchmark that provides an upper boundary for the performance of bypass controllers. This theoretical benchmark ensures a justin-time delivery of warm water by taking into account time delays in the network. In a simulation case study of a small neighbourhood in Genk, Belgium, the benchmark shows that substantial improvement regarding bypass control is possible.

show abstract

“…The application of exergy analysis in existing buildings has a significant potential in the identification of unconventional opportunities and the consequent reduction of dependency on high quality fuels (Jansen et al, 2012). However, the majority of exergy research in the built environment dedicated to improve energy performance has been applied at large scale technologies, especially in the assessment of district networks and community supply power generation systems (Bagdanavicius et al, 2012;Li and Svendsen, 2012;Molyneaux et al, 2010;Nilsson, 1997;Rezaie et al, 2015;Verda et al, 2012a;Verda et al, 2001;Verda et al, 2012b). This previous research has mainly focused on defining criteria for network design and energy generation plant sizing.…”

Section: Exergy and Buildingsmentioning

confidence: 99%

The role of an exergy-based building stock model for exploration of future decarbonisation scenarios and policy making

et al. 2017

View full text Add to dashboard Cite

State-of-the-art research suggests that energy systems are best evaluated using exergy analysis, as exergy represents the real value of an energy source, demonstrating it to be the only rational basis for evaluation. After discovering the lack of thermodynamic integration into stock modelling, this paper presents the development of an exergy-based building stock model. The aim of this paper is twofold. Firstly, to investigate the impact of large-scale future energy retrofit scenarios in the English and Welsh (E&W) non-domestic sector, and secondly, to determine the potential of exergy analysis in improving sectoral efficiency and its potential implications on exergy-oriented policy making. The research explores seven different largescale future retrofit scenarios that encompass typical, low-carbon, and low-exergy approaches. Modelling results show that by 2050, current regulations have the potential to reduce carbon emissions by up to 49.0 ±2.9% and increasing sector thermodynamic efficiency from 10.7% to 13.7%. On the other hand, a low-exergy oriented scenario based on renewable electricity and heat pumps is able to reduce carbon emissions by 88.2 ±2.4%, achieving a sectoral exergy efficiency of 19.8%. This modelling framework can provide energy policy makers with new insights on policy options based on exergy indicators and the assessment of their potential impact.

show abstract

Energy and exergy analysis of low temperature district heating network

Cited by 139 publications

References 13 publications

Petrogeothermal energy resources within low-temperature areas of Iceland

Petrogeothermal energy resources within low-temperature areas of Iceland

A theoretical benchmark for bypass controllers in a residential district heating network

The role of an exergy-based building stock model for exploration of future decarbonisation scenarios and policy making

Contact Info

Product

Resources

About