Study of the optimal control problem formulation for modulating air-to-water heat pumps connected to a residential floor heating system

Verhelst, Clara; Logist, Filip; Impe, Jan Van; Helsen, Lieve

doi:10.1016/j.enbuild.2011.10.015

Cited by 131 publications

(76 citation statements)

References 28 publications

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“…Studies on the trade-off between modelling accuracy and computational time of specific equipment have been reported in the literature, e.g. air source heat pump [10], combined heat and power [11], and hot water tank storage [12]. On the other hand, reducing the problem complexity by using different time series modelling formulation has been less well studied, especially in problems with integrated storage equipment.…”

Section: Introductionmentioning

confidence: 99%

Multiple time grids in operational optimisation of energy systems with short- and long-term thermal energy storage

Renaldi

Friedrich

2017

Energy

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As a vital part of future low carbon energy systems, storage technologies need to be included in the overall optimisation of energy systems. However, this comes with a price of increasing complexity and computational cost. The increase in complexity can be limited by using simplified time series formulations in the optimisation process, e.g. typical days or multiple time grids. This in turn will affect the computational cost and quality of the optimisation results. The trade-off between these two aspects has to be quantified in order to appropriately use the simplification method. This paper investigates the implementation of the multiple time grids approach in the optimisation of a solar district heating system with short-and long-term thermal energy storage. The multiple time grids can improve the optimisation computational time by over an order of magnitude. Nevertheless, this is not a general rule since it is shown that there is a possibility for the computational time to increase with time step size. Furthermore, the benefits of multiple time grids become more evident in optimisation with a longer time horizon, reaching almost two order of magnitude improvement in computational time for the case with 6 years time horizon and 5% MIP gap.

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Section: Introductionmentioning

confidence: 99%

Multiple time grids in operational optimisation of energy systems with short- and long-term thermal energy storage

Renaldi

Friedrich

2017

Energy

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“…HPWH uses two thirds less electrical energy owing to its coefficient of performance (COP). This huge energy saving has made heat pumps gain wider application [2] in both space and water heating. Research on optimal sizing and maximization of ambient energy harvesting from the surrounding environment using HPWHs continues.…”

Section: Introductionmentioning

confidence: 99%

Optimal energy control of grid tied PV–diesel–battery hybrid system powering heat pump water heater

Sichilalu

Xia

2015

Solar Energy

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This paper develops an optimal control strategy for power dispatch of the grid-tied photovoltaic (PV) -battery-diesel system to power heat pump water heaters (HPWH). The system consists of the PV modules, grid, battery, HPWH, diesel generator (DG) and other domestic appliances. The PV can simultaneously feed in the excess power to the grid and supply the loads. The battery is used as storage of cheaper-to-buy off-peak grid energy, dependent on the time-of-use (TOU) electricity tariff, whilst the DG is a backup power source to the HPWH. The objective function of the model is to minimize energy and fuel cost while maximizing PV energy trade-off for incentives. The TOU is an important control parameter in this model. The power flows from each power source are the control variables. The optimal control shows a great potential to realize a practical net zero-energy building and demand side management. This model meets both the technical and operational constraints. A case study is done based on a 3x16kW HPWH installed at a Pretoria hotel in South Africa. Simulations run over a year on selected seasonal dates using the actual measured demand of the HPWH. The optimal control problem is solved using a mixed integer non-linear program and the results show how TOU affects the power dispatch to the HPWH. The energy and cost savings are presented in this paper.

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“…The most predominant usage [2], [3] of the HPWH is for water and space heating. Heat pumps have low energy…”

Section: Introductionmentioning

confidence: 99%

Optimal power dispatch of a grid tied-battery-photovoltaic system supplying heat pump water heaters

Sichilalu

Xia

2015

Energy Conversion and Management

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Study of the optimal control problem formulation for modulating air-to-water heat pumps connected to a residential floor heating system

Cited by 131 publications

References 28 publications

Multiple time grids in operational optimisation of energy systems with short- and long-term thermal energy storage

Multiple time grids in operational optimisation of energy systems with short- and long-term thermal energy storage

Optimal energy control of grid tied PV–diesel–battery hybrid system powering heat pump water heater

Optimal power dispatch of a grid tied-battery-photovoltaic system supplying heat pump water heaters

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