Energy Performance and Economic Evaluation of Heat Pump/Organic Rankine Cycle System with Sensible Thermal Storage

C. Carmo, O. Dumont, M. P. Nielsen, Brian Elmegaard

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Abstract

The interaction between electrical and thermal energy demands represent a potential area for balancing supply and demand that could contribute to the integration of intermittent renewables in energy systems. To enable the interaction between thermal and electric energy, an innovative concept that consists of a ground-source heat pump with possibility of reversing operation as an ORC power cycle combined with solar heating in a single-family building is introduced. The ORC mode enables the use of solar energy in periods of no heat energy demand and reverses the heat pump cycle to supply electrical power.This paper combines a dynamic model based on empirical data of the HP/ORC system with lessons learned from 140 heat pump installations operating in real-life conditions in a cold climate. These installations were monitored for a period up to 5 years.Based on the aforementioned model and real-life conditions knowledge, the paper considers two different sensible energy storage (TES) configurations for the reversible heat pump/organic Rankine cycle (HP/ORC) system: a buffer tank for both space heating and domestic hot water and a hot water storage tank used exclusively for domestic hot water. The results with the two different configurations are simulated in the Modelica language and compared in terms of energy shift potential in order to optimize RES integration, as well as the economic feasibility of the system in a cold climate.
Original languageEnglish
Title of host publicationProceedings of ECOS 2016: 29th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Number of pages11
Publication date2016
Publication statusPublished - 2016
Event29th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems - Portorož, Slovenia
Duration: 19 Jun 201623 Jun 2016
http://www.ecos2016.si/

Conference

Conference29th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
CountrySlovenia
CityPortorož
Period19/06/201623/06/2016
Internet address

Keywords

  • Reversible Heat Pump/Organic Rankine Cycle
  • Real-life operation
  • Sensible thermal storage
  • Energy efficiency
  • Economic feasibility

Cite this

Carmo, C., Dumont, O., Nielsen, M. P., & Elmegaard, B. (2016). Energy Performance and Economic Evaluation of Heat Pump/Organic Rankine Cycle System with Sensible Thermal Storage. In Proceedings of ECOS 2016: 29th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems