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Numerical performance assessment of heat pumps in Rankine-based Carnot battery systems for grid balancing services.

Number: 0170

Author(s) : TASSENOY R., CRAECKER J. de, SIMIC K., DEMEESTER T., PAEPE M. de, LECOMPTE S.

Summary

Due to the increasing share of renewable sources in the energy mix, large-scale energy storage systems are becoming essential to ensure secure and stable energy supply. Carnot batteries, a combination of a power-to-heat, a thermal storage and a heat-to-power system, could provide a possible solution. Heat pump systems have been considered as the power-to-heat technology for Carnot batteries. However, it is not clear which grid services these heat pumps could deliver. To answer this question, a 1 MW vapour compression heat pump, suitable for integration in a Carnot battery, was modelled in Modelica. Quasi-steady state operation of compressor and expansion valve was considered, while dynamic finite volume models were used for the heat exchangers. Behavior of the sensible storage tanks was assumed ideal and quasi-steady boundary conditions were imposed. Furthermore, a control strategy driven by the requirements of the electrical grid was proposed. The dynamic model simulates and evaluates the heat pump’s response to the qualification test profiles for grid balancing services. It was found that the heat pump can deliver a symmetric capacity of 125 kW for primary reserve while maintaining a correct delivery temperature to the thermal storage system. In addition, the system qualifies for delivering a capacity of 250 kW for secondary and tertiary reserve. These results indicate that the delivery of grid balancing services could be another revenue stream to increase the financial feasibility of Carnot battery systems and it is thus worthwhile to investigate its potential financial benefits.

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Pages: 12 p.

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Details

  • Original title: Numerical performance assessment of heat pumps in Rankine-based Carnot battery systems for grid balancing services.
  • Record ID : 30031098
  • Languages: English
  • Subject: Technology
  • Source: 14th IEA Heat Pump Conference 2023, Chicago, Illinois.
  • Publication date: 2023/05/15

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