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Increasing economic benefits by load-shifting of electrical heat pumps

Joannes Laveyne (UGent) , Brecht Zwaenepoel (UGent) , Greet Van Eetvelde (UGent) and Lieven Vandevelde (UGent)
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Abstract
Electrical heating is still widely used in the process industry. While the use of immersion heaters for the production of hot water or steam is declining, the adoption rate of electrical heat pumps is increasing rapidly. Heat pumps show great flexibility and potential for energy savings, e.g. through low temperature waste heat recuperation. In combination with thermal storage they also allow for load shifting. Because their main power source is electricity, which up to now cannot be stored efficiently, heat pumps can transpose their thermal load shifting ability to the electrical grid. Today, more and more industrial electricity consumers are adopting energy supply contracts with variable pricing parameters strongly coupled to the energy trading market. Some large consumers even buy and sell on this market directly. In this paper it is proven that for customers with (hourly) variable electricity pricing, the use of electrical heat pumps can lead to additional cost savings without influencing the industrial process. The yield of the heat pumps can be increased during hours with low energy cost, with the thermal buffer absorbing the heat surplus. During hours with high energy cost the heat pump yield is lowered and stored heat is used by the industrial process. Considering that heat can be stored much more efficiently than electricity, the load shifting ability of heat pumps can also be utilised to provide stability on electrical smart grids and to increase electrical self-consumption on microgrids. This paper will also explore the potential of thermal storage through heat pumps for these electrical smart grid applications.
Keywords
POWER, INTEGRATION, ENERGY-STORAGE, TECHNOLOGY, SYSTEMS

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Chicago
Laveyne, Joannes, Brecht Zwaenepoel, Greet Van Eetvelde, and Lieven Vandevelde. 2014. “Increasing Economic Benefits by Load-shifting of Electrical Heat Pumps.” In Chemical Engineering Transactions, ed. PS Varbanov, JJ Klemes, PY Liew, JY Yong, and P Stehlik, 39:1513–1518. AIDIC SERVIZI SRL.
APA
Laveyne, J., Zwaenepoel, B., Van Eetvelde, G., & Vandevelde, L. (2014). Increasing economic benefits by load-shifting of electrical heat pumps. In PS Varbanov, J. Klemes, P. Liew, J. Yong, & P. Stehlik (Eds.), Chemical Engineering Transactions (Vol. 39, pp. 1513–1518). Presented at the 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES 2014), AIDIC SERVIZI SRL.
Vancouver
1.
Laveyne J, Zwaenepoel B, Van Eetvelde G, Vandevelde L. Increasing economic benefits by load-shifting of electrical heat pumps. In: Varbanov P, Klemes J, Liew P, Yong J, Stehlik P, editors. Chemical Engineering Transactions. AIDIC SERVIZI SRL; 2014. p. 1513–8.
MLA
Laveyne, Joannes, Brecht Zwaenepoel, Greet Van Eetvelde, et al. “Increasing Economic Benefits by Load-shifting of Electrical Heat Pumps.” Chemical Engineering Transactions. Ed. PS Varbanov et al. Vol. 39. AIDIC SERVIZI SRL, 2014. 1513–1518. Print.
@inproceedings{5832222,
  abstract     = {Electrical heating is still widely used in the process industry. While the use of immersion heaters for the production of hot water or steam is declining, the adoption rate of electrical heat pumps is increasing rapidly. Heat pumps show great flexibility and potential for energy savings, e.g. through low temperature waste heat recuperation. In combination with thermal storage they also allow for load shifting. Because their main power source is electricity, which up to now cannot be stored efficiently, heat pumps can transpose their thermal load shifting ability to the electrical grid. Today, more and more industrial electricity consumers are adopting energy supply contracts with variable pricing parameters strongly coupled to the energy trading market. Some large consumers even buy and sell on this market directly. In this paper it is proven that for customers with (hourly) variable electricity pricing, the use of electrical heat pumps can lead to additional cost savings without influencing the industrial process. The yield of the heat pumps can be increased during hours with low energy cost, with the thermal buffer absorbing the heat surplus. During hours with high energy cost the heat pump yield is lowered and stored heat is used by the industrial process. Considering that heat can be stored much more efficiently than electricity, the load shifting ability of heat pumps can also be utilised to provide stability on electrical smart grids and to increase electrical self-consumption on microgrids. This paper will also explore the potential of thermal storage through heat pumps for these electrical smart grid applications.},
  author       = {Laveyne, Joannes and Zwaenepoel, Brecht and Van Eetvelde, Greet and Vandevelde, Lieven},
  booktitle    = {Chemical Engineering Transactions},
  editor       = {Varbanov, PS and Klemes, JJ and Liew, PY and Yong, JY and Stehlik, P },
  isbn         = {9788895608303},
  issn         = {1974-9791},
  language     = {eng},
  location     = {Prague, Czech Republic},
  pages        = {1513--1518},
  publisher    = {AIDIC SERVIZI SRL},
  title        = {Increasing economic benefits by load-shifting of electrical heat pumps},
  url          = {http://dx.doi.org/10.3303/CET1439253},
  volume       = {39},
  year         = {2014},
}

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