How heat pumps and thermal energy storage can be used to manage wind power: A study of Ireland

Vorushylo, Inna; Keatley, Patrick; Shah, Nikhilkumar; Green, Richard; Hewitt, Neil

doi:10.1016/j.energy.2018.03.001

Cited by 61 publications

(27 citation statements)

References 18 publications

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“…In order to schedule the time of operation of the EB to charge the hot water storage tank, the optimization procedure given by (11) and (12) are followed. The objective function is to minimize the cost of electricity for production of hot water to meet the demand and storage needs.…”

Section: Operation Schedule Of Eb For Flexibilitymentioning

confidence: 99%

“…Here The optimization problem was solved by minimizing the cost function using brute force optimization in MATLAB. All possible candidates for the solutions are generated and then checked against the satisfaction of problem statement as given in (11) and (12). For more than one solutions, the solution with less ON/OFF operation of EB is selected.…”

Section: Operation Schedule Of Eb For Flexibilitymentioning

confidence: 99%

“…The perspective of heat electrification in a wind dominated market using resistive heating and storage is the most carbon-intensive method [11] with lower investment cost compared to HP [9,12]. Further, large HPs take a long time from a cold start until they reach their optimal efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Flexibility from Electric Boiler and Thermal Storage for Multi Energy System Interaction

et al. 2019

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Active use of heat accumulators in the thermal system has the potential for achieving flexibility in district heating with the power to heat (P2H) units, such as electric boilers (EB) and heat pumps. Thermal storage tanks can decouple demand and generation, enhancing accommodation of sustainable energy sources such as solar and wind. The overview of flexibility, using EB and storage, supported by investigating the nature of thermal demand in a Danish residential area, is presented in this paper. Based on the analysis, curve-fitting tools, such as neural net and similar day method, are trained to estimate the residential thermal demand. Utilizing the estimated demand and hourly market spot price of electricity, the operation of the EB is scheduled for storing and fulfilling demand and minimizing energy cost simultaneously. This demonstrates flexibility and controlling the EB integrated into a multi-energy system framework. Results show that the curve fitting tool is effectively suitable to acknowledge thermal demands of residential area based on the environmental factor as well as user behaviour. The thermal storage has the capability of operating as a flexible load to support P2H system as well as minimize the effect of estimation error in fulfilling actual thermal demand simultaneously.

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Section: Operation Schedule Of Eb For Flexibilitymentioning

confidence: 99%

Section: Operation Schedule Of Eb For Flexibilitymentioning

confidence: 99%

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Flexibility from Electric Boiler and Thermal Storage for Multi Energy System Interaction

et al. 2019

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“…Market data shows that there is a sharp increase in the implementation and development of new heat pump technologies with higher coefficient of performances (COPs). At present, there is great interest in using heat pumps to save energy and using fuel and energy sources effectively …”

Section: Introductionmentioning

confidence: 99%

“…At present, there is great interest in using heat pumps to save energy and using fuel and energy sources effectively. [4][5][6] Currently, there are three main types of heat pumps namely water source heat pumps, ground source heat pumps and air source heat pumps. A ground watersource heat pump system with air pre-conditioning (GWHP-FAP) was proposed from the perspective of cascade utilization of low-level energy stored in the groundwater.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of defrosting and heating performance of a solar‐assisted heat pump integrated phase change energy storage

Chen

Zhang

et al. 2019

Int J Energy Res

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Summary This thesis investigates a novel solar‐assisted heat pump integrated phase change energy storage system. The defrosting performance of this system was studied experimentally and the results were compared with two traditionally used methods: reverse cycle defrosting (RCD) method and hot gas bypass defrosting (HGBD) method. The results show that the phase change energy storage system has superior performance compared with traditional defrosting methods. The indoor temperature drop recorded was relatively small and the defrosting time was 75% of the RCD system and 53% of HGBD system. The phase change energy storage system increased the condensation temperature which consequently increased the temperature difference of heat transfer resulting in higher conductivity in the defrosting progress. Compared with the method of RCD and the method of HGBD, the recovery time of the system was shortened by 90 and 160 seconds, respectively. The system works with low‐temperature heat source and circulating water, which considerably reduces energy consumption, thereby improving the performance of the defrosting system. A further experimental study was also conducted on the heating performance and the results also indicated that the value of COP can reach up to 3.6 in daytime, and the indoor temperature can be stably maintained above 18°C throughout the day. Novelty Statement A new defrosting method for energy storage defrosting is proposed, and the defrosting performance is compared with two common defrosting methods. In addition, the performances of the heating system over the day were experimentally investigated. The experimental results show the system meets the heating needs of the building. Finally, the influence of the outdoor temperature on the exergy efficiency of the system was discussed. It shows that this system can improve the operational stability, the system economy and energy saving.

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Electrification of Heating—Requirements for Successful Wide‐Scale Deployment

Hewitt

2024

WIREs Energy & Environment

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Electrification is potentially the most efficient method of decarbonization of space, water, and in certain instances, process heating through the deployment of electrically driven heat pumps. However, challenges are noted in terms of electricity network capacity that ultimately must influence a holistic approach to building/process heating demand reductions which in turn must influence heat pump development, heat pump operations, heat pump capital cost, and the role of thermal storage. Approaches to these challenges are presented from a global and, a UK and Ireland perspective, as for the UK and Ireland, it is often muted that the electricity network is less well suited to addressing the electrification of heating. Thus, this work will consider the likely cost‐effective heat demand reductions in buildings and processes, how might heat pumps operate in future electricity markets and systems, how can we make heat pumps cheaper to purchase and cheaper to operate and what is the role and type of energy storage in terms of demand side management. Thermal energy storage will be considered for space heating (30°C–80°C), water heating (60°C+ to negate legionella), and lower temperature industrial process (up to e.g., 300°C). Furthermore, an analysis of a UK housing development is presented as a retrofit case study for social housing, illustrating the impacts of the electricity network, and approaches that can be taken, for example, thermal storage, to minimize such impacts. Higher temperature systems will be considered for process applications.

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How heat pumps and thermal energy storage can be used to manage wind power: A study of Ireland

Cited by 61 publications

References 18 publications

Flexibility from Electric Boiler and Thermal Storage for Multi Energy System Interaction

Flexibility from Electric Boiler and Thermal Storage for Multi Energy System Interaction

Experimental analysis of defrosting and heating performance of a solar‐assisted heat pump integrated phase change energy storage

Electrification of Heating—Requirements for Successful Wide‐Scale Deployment

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