Potential of Solar Powered Underground Waste Heat Utilisation in Total Site Heat Integration

This work presents the integration of Photovoltaic-Thermal (PVT) waste heat with Underground Thermal Energy Storage (UTES) systems and studies the potential of the system in an urban-industrial site Heat Integration. The waste heat from PVT can be used to charge the UTES unit in the summertime, where the waste heat sources/sinks from the PVT can be up-cycled to fulfil the cooling or heating demands of various systems, ranging from domestic to industrial processes. This work studies the energy requirements and temperature ranges for heat pumps via Total Site Composite Curves, evaluating the energy coverage based on the current temperature of the waste heat and potential coverage via heat pumps technologies. This tool serves as a benchmark for practitioners to evaluate the heat pump duties for the system, and the coefficient of performance (COP) of a heat pump can be identified. The obtained results indicate that the electricity generation efficiency of the PV panels is increased by up to 10 % as a result of the water cooling, and the system is capable of covering up to 90 % of the building's energy needs. When applied in the context of a Total Site Heat Integration, the RESHeat system allows substantial savings in cooling water (94 %) and low-pressure steam (23 %).

[1]  P. Varbanov,et al.  Total Site Heat Integration benefiting from geothermal energy for heating and cooling implementations. , 2021, Journal of environmental management.

[2]  Jiří Jaromír Klemeš,et al.  Trade-offs between the recovery, exergy demand and economy in the recycling of multiple resources , 2021 .

[3]  P. Varbanov,et al.  Urban and industrial symbiosis for circular economy: Total EcoSite Integration. , 2020, Journal of environmental management.

[4]  Małgorzata Fedorczak-Cisak,et al.  Modeling and experimental validation and thermal performance assessment of a sun-tracked and cooled PVT system under low solar irradiation , 2020 .

[5]  P. Varbanov,et al.  Hierarchical targeting of hydrogen network system and heat integration in a refinery , 2020 .

[6]  P. Y. Liew,et al.  Total Site Heat and Power Integration for Locally Integrated Energy Sectors , 2020 .

[7]  Jiří Jaromír Klemeš,et al.  Multi-period energy targeting for Total Site and Locally Integrated Energy Sectors with cascade Pinch Analysis , 2018, Energy.

[8]  Li Sun,et al.  Site utility system optimization with operation adjustment under uncertainty , 2017 .

[9]  Jiří Jaromír Klemeš,et al.  Integrating district cooling systems in Locally Integrated Energy Sectors through Total Site Heat Integration , 2016 .

[10]  Petar Sabev Varbanov,et al.  Locally Integrated Energy Sectors supported by renewable network management within municipalities , 2015 .

[11]  Marian Trafczynski,et al.  Handbook of Process Integration (PI). Minimisation of Energy and Water Use, Waste and Emissions , 2015 .

[12]  Sharifah Rafidah Wan Alwi,et al.  Process Integration and Intensification: Saving Energy, Water and Resources , 2014 .

[13]  Igor Bulatov,et al.  Integrating waste and renewable energy to reduce the carbon footprint of locally integrated energy sectors , 2008 .

[14]  Luis Puigjaner,et al.  Targeting and design methodology for reduction of fuel, power and CO2 on total sites , 1997 .

[15]  Bodo Linnhoff,et al.  A User guide on process integration for the efficient use of energy , 1994 .

[16]  P. Ocłoń.  Renewable Energy Utilization Using Underground Energy Systems , 2021, Lecture notes in Energy.

[17]  Simon Perry,et al.  Total Site Methodology , 2013 .

[18]  Bodo Linnhoff,et al.  Total site targets for fuel, co-generation, emissions, and cooling , 1993 .