Integration and optimization of a solar collector assisted steam generation heat pump combined with high temperature seasonal storage for industrial applications
M. Janssen (TU Delft - Electrical Engineering, Mathematics and Computer Science)
R. Santbergen – Mentor (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Z.U.A. Ul Abdin – Mentor (TU Delft - Electrical Engineering, Mathematics and Computer Science)
O. Isabella – Graduation committee member (TU Delft - Electrical Engineering, Mathematics and Computer Science)
E. Zanetti – Graduation committee member (TU Delft - Mechanical Engineering)
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Abstract
This thesis addresses the urgent challenge of decarbonizing large-scale industrial process heating with limited available electricity grid capacity. An integrated energy system is developed combining solar heat generation with thermal storage coupled to a high-temperature heat pump for industrial process heating up to 150 ℃ This work involves the development of individual component models capable of high temperature (100--150 ℃) operation and the integration of these components into a numerical energy system model. The model is evaluated for two industrial sectors, Food & Beverage (130 ℃) and Paper & Pulp (150 ℃), under northern and southern European climate conditions. The developed integrated model is added to the PVMD Toolbox, an advanced modeling tool developed by the Photovoltaic Materials and Devices research group at TU Delft.
Through dynamic hourly simulations over a full year, the theoretical feasibility of the integrated energy system has been demonstrated. The thermal efficiency of the solar thermal collectors averages 40% and 50% in Delft and Seville respectively. Significant reductions in peak electricity grid consumption of 70% and 100% can be achieved for northern and southern European climates respectively. Solar thermal collector count is the most important performance variable over all scenarios and seasonal heat storage is essential for peak load reductions in northern European climates. The system can be economically competitive compared to a natural gas boiler reference (80 €/MWh) in Seville, achieving a minimum LCOH of 66 €/MWh. For Delft the lowest LCOH is 119 €/MWh, not yet competitive under current gas prices but considerably less exposed to fossil fuel price volatility.