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Combined heat and power plant integrated with mobilized thermal energy storage (M-TES) system
Mälardalen University, School of Sustainable Development of Society and Technology. (bioenergy group)
Royal Institute of Technology, Stockholm, Sweden.
Mälardalen University, School of Sustainable Development of Society and Technology.ORCID iD: 0000-0003-0300-0762
Eskilstuna Energi och Miljo AB, Eskilstuna, Sweden.
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2010 (English)In: Frontiers of Energy and Power Engineering in China, ISSN 1673-7393, Vol. 4, no 4, p. 469-474Article in journal (Refereed) Published
Abstract [en]

Energy consumption for space heating and hot tap water in residential and service sectors accounts for one third of total energy utilization in Sweden. District heating (DH) has been used for heat supply to areas with high energy demand. However, there are still a lot of detached houses and sparse areas with no connection to a DH network where electrical heating or oil/pellet boilers are used to meet heat demand. Sometimes, extending the existing DH network to those spare areas is not economically feasible because of the small heat demands and the large investment. Mobilized thermal energy storage (M-TES) system is an alternative way to supply heat for detached buildings or sparse areas by using industrial heat. In this paper, integration of a combined heat and power (CHP) plant and an M-TES system is analyzed. The impacts of four options of the integrated system are discussed including the power and heat output in the CHP plant, as well as the performance of M-TES system.

Place, publisher, year, edition, pages
Springer , 2010. Vol. 4, no 4, p. 469-474
Keywords [en]
Mobilized thermal energy system; District heating; Thermal energy storage; Combined heat and power; Detached houses
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-10638DOI: 10.1007/s11708-010-0123-9Scopus ID: 2-s2.0-78649903139OAI: oai:DiVA.org:mdh-10638DiVA, id: diva2:359501
Projects
Ångpanneföreningens Forskningsstiftelse (ÅF), SwedenAvailable from: 2010-10-28 Created: 2010-10-28 Last updated: 2013-12-04Bibliographically approved
In thesis
1. Mobilized Thermal Energy Storage for Heat Recovery for Distributed Heating
Open this publication in new window or tab >>Mobilized Thermal Energy Storage for Heat Recovery for Distributed Heating
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Conventional energy sources—oil and electricity—dominate the heat supply market. Due to their rising costs and their negative environmental effects on global climate change, it is necessary to develop an alternative heat supply system featuring low cost, high energy efficiency and environment friendliness. At present, it is often challenging to supply heat to detached buildings due to low energy efficiency and high distribution cost. Meanwhile, significant amounts of industrial waste and excess heat are released into the environment without recycling due to the difficulty of matching time and space differences between suppliers and end users. Phase change materials (PCMs), with the advantages of being storable and transportable, offer a solution for delivering that excess heat from industrial plants to detached buildings in sparse, rural areas.

 

The objective of this thesis is to study PCMs and latent thermal energy storage (LTES) technology, and to develop a mobilized thermal energy storage (M-TES) system that can use industrial waste or excess heat for heat recovery and distribution to areas in need.

 

Organic PCMs were chosen for study because they are non-toxic and non-corrosive, and they exhibit no phase separation and little sub-cooling when compared to inorganic PCMs. Two major issues including leakage of liquid PCMs and low thermal conductivity. Polyethylene glycol (PEG) was chosen to help analyze the thermal behavior of organic PCMs and PEG-based form-stable composites. To overcome the issue of low thermal conductivity, modified aluminum nitride (AlN) powder was added to the composites. Increased thermal conductivity traded off decreased latent heat. The PEG/EG composite, prepared by mixing the melted PEG into an expanded graphite (EG) matrix showed good thermal performance due to its large enthalpy and high thermal conductivity.

 

To make a systematic study of the M-TES system, a compact lab-scale system was designed and built. Characteristics of PCM were studied, and the performance of the direct-contact TES container was investigated. A case study using an M-TES system to deliver heat from a combined heat and power (CHP) plant to a small village was conducted. A technical and economic feasibility study was conducted for an integrated heat supply system using the M-TES system. In addition, the options for charging a TES container at a CHP plant were analyzed and compared from the viewpoints of power output, heat output and incomes.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2010
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 92
National Category
Engineering and Technology
Research subject
Energy- and Environmental Engineering
Identifiers
urn:nbn:se:mdh:diva-11142 (URN)978-91-86135-98-0 (ISBN)
Public defence
2010-12-20, Lambda, Mälardalen University, Västerås, 10:00 (English)
Opponent
Supervisors
Projects
Ångpanneföreningens Forskningsstiftelse (ÅF)
Available from: 2010-11-22 Created: 2010-11-18 Last updated: 2010-11-29Bibliographically approved

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Yan, JinyueDahlquist, Erik

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