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Mobilized Thermal Energy Storage (M-TES)

The total residential and service sector accounted for about 36% of total energy use. The improvement in energy efficiency in the spacing heating and hot water represents one of area where greenhouse gas emissions can be substantially reduced. Extension of district heating might be one of the alternatives to improve the heating system for those detached houses. However, the owners of detached houses were less likely to install a new heating system than those with other types of heating system. At the same time, costs related to the extension of district heating network can be significant to those areas with low density of the population. Therefore, new technology with economically viable and energy efficient solution for the detached houses heating shall be further explored. This project is to study a mobilized energy storage system to tackle the above challenging problems.
M-TES is a novel energy storage technology, so-called mobilized thermal energy storage system (M-TES), for the recovery of industrial waste heat for supplying heat for distributed users, e.g. detached houses. The M-TES uses the thermal energy storage materials, such as phase change materials (PCM), to store waste heat and then transport the storage to another location for releasing heat for distributed users. The advantages of this system enable the efficient use of waste in an economically variable way to deliver heat without pipeline as normally does in a district heat network. The main tasks of this project include experimental tests of different storage materials, the dimension and structure of the storage tank, and heat exchangers, feasibility study to identify the economic and energy benefits of the M-TES, and optimized materials and design for distributed users.
 
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Energy storage materials are packed in a specific container loaded on the truck. Using heat exchanger and heat transfer media, heat is stored by thermal energy storage materials by recovery of industrial waste heat or other heat resources, from e.g. co-generation plants and steel mills, pulp and paper mills etc. After fully charging, heat can be transported by a lorry to end users. The system has features of high flexibility of heating load and operation, reduced costs for the network infrastructure in district heating system and potential economic benefits. This is especially suitable for the distributed users like detached houses.

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The research group including the Royal Institute of Technology (KTH), Mälardalen University (MDH), Sun Yat-Sen University (SYSU) and Tianjing University has been working on M-TES systems since 2007 through projects funded by Swedish  Ångpanneföreningens Forskningsstiftelse (ÅForsk), following activities have been carried out:
  • The selection of the energy storage materials, heat transfer characteristics in the phase change materials
  • Design the key components in the M-TES including the demission and structure of the storage tank
  • Dynamic modeling of the charging and discharging processes of the M-TES systems
  • Economic analysis of the demonstration projects of the M-TES.

Publications:

Economic assessment of the mobilized thermal energy storage (M-TES) system for distributed heat supply
H Li, W Wang, J Yan, E Dahlquist, Applied Energy 104, 178-186, 2013.


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