The cooling sector currently consumes around 14% of the UK's electricity and emits around 10% of the UK's greenhouse gases. Global electricity demand for space cooling alone is forecast to triple by 2050. Moreover, as air temperature increases, the cooling demand increases, but a refrigerator's Coefficient of Performance decreases. This results in a time mismatch between a refrigerator's efficient operation and peak cooling demand over a day. Clearly, this problem will deteriorate over the coming decades. Indeed, research by UKERC recently reported that cooling sector will cause a 7 GW peak power demand to the grid by 2050 in the UK. A solution is to employ cold thermal energy storage, which allows much more flexible refrigeration operation, thereby resulting in improved refrigeration efficiency and reduced peak power demand. Large-scale deployment of cold thermal energy storage could dramatically reduce this peak demand, mitigating its impact to the grid. Moreover, the UK curtails large amounts of wind power due to network constraints. For example, over 3.6TWh of wind energy in total was curtailed on 75% of days in 2020. Therefore, through flattening energy demand, cold thermal energy storage technology provides a means to use off-peak wind power to charge cold thermal energy storage for peak daytime cooling demand. This project, based on the proposed novel adsorption-compression thermodynamic cycle, aims to develop an innovative hybrid technology for both refrigeration and cold thermal energy storage at sub-zero temperatures. The resultant cold thermal energy storage system is fully integrated within the refrigerator and potentially has significantly higher power density and energy density than current technologies, providing a disruptive new solution for large scale cold thermal energy storage. The developed technology can utilise off-peak or curtailed electricity to shave the peak power demand of large refrigeration plants and district cooling networks, and thus mitigates the impacts of the cooling sector on the grid and also reduces operational costs.

Industrial emissions are an important source of atmospheric CO2 that must be tackled for the UK to meet its legally binding targets. CO2 emissions from industry occur typically from a number of small, low concentration sources with a wide range of flue gas compositions and impurity profiles. For example, in a refinery, CO2 is emitted from many process furnaces, hydrogen production units and power generation plant, and emission points are scattered over several km2. If a centralized CCS plant is applied, a large piping network and compression power will be required. Moreover, the capture unit would need to deal with a wide range of impurities. This is not optimal. Instead, a much more efficient capture process design involves several separate and bespoke capture units at different locations on site, sharing only a common high concentration CO2 export pipeline. It is therefore beneficial to have several compact and flexible capture units, with low operating and capital costs and high efficiency able to use waste heat from different process units. CO2 capture by using amine solvents is the most mature technology employed in most carbon capture plants, including the world's first large-scale CCS plant at Boundary Dam, Canada. This technology is considered a reference for next-generation technologies. Incremental improvements through the use of alternative amines or amine mixtures with higher capacity and/or lower regeneration/degradation costs are potentially possible. However, major problems with this conventional process remain without a fundamentally different design. They include (a) low mass transfer efficiency in the absorber and desorber, resulting in large equipment size and high capital and operating costs, (b) high energy consumption in solvent regeneration, causing a very high energy penalty and operating cost, (c) corrosion caused by concentrated amine solutions, which makes it necessary to use more expensive materials, (d) thermal and oxidative degradation of amines above 100oC. More solvent make-up means high operating cost We propose to meet this challenge by combining two technologies, rotating packed bed absorption and microwave-assisted regeneration, which will enable small and flexible capture devices to be installed at a wide range of industrial sites. A rotating packed bed column offers a dramatically reduced volume by 90% compared to a traditional absorption column, while microwave regeneration is a revolutionary method for regenerating amine solutions at 70oC (rather than 120oC) that can operate without a temperature swing and is very fast, leading to further significant reduction in capital costs (by around 50%), in the sensible heat used for CO2 desorption, and in corrosion and solvent degradation by over 90%. CO2 desorption at 70oC also enables the regenerator to use low grade industrial waste heat.

The cooling sector currently consumes around 14% of the UK's electricity and emits around 10% of the UK's greenhouse gases. Global electricity demand for space cooling alone is forecast to triple by 2050. Moreover, as air temperature increases, the cooling demand increases, but a refrigerator's Coefficient of Performance decreases. This results in a time mismatch between a refrigerator's efficient operation and peak cooling demand over a day. Clearly, this problem will deteriorate over the coming decades. Indeed, research by UKERC recently reported that cooling sector will cause a 7 GW peak power demand to the grid by 2050 in the UK. A solution is to employ cold thermal energy storage, which allows much more flexible refrigeration operation, thereby resulting in improved refrigeration efficiency and reduced peak power demand. Large-scale deployment of cold thermal energy storage could dramatically reduce this peak demand, mitigating its impact to the grid. Moreover, the UK curtails large amounts of wind power due to network constraints. For example, over 3.6TWh of wind energy in total was curtailed on 75% of days in 2020. Therefore, through flattening energy demand, cold thermal energy storage technology provides a means to use off-peak wind power to charge cold thermal energy storage for peak daytime cooling demand. This project, based on the proposed novel adsorption-compression thermodynamic cycle, aims to develop an innovative hybrid technology for both refrigeration and cold thermal energy storage at sub-zero temperatures. The resultant cold thermal energy storage system is fully integrated within the refrigerator and potentially has significantly higher power density and energy density than current technologies, providing a disruptive new solution for large scale cold thermal energy storage. The developed technology can utilise off-peak or curtailed electricity to shave the peak power demand of large refrigeration plants and district cooling networks, and thus mitigates the impacts of the cooling sector on the grid and also reduces operational costs.

EPSRC Centre for Doctoral Training in Resilient Decarbonised Fuel Energy Systems Led by the University of Nottingham, with Sheffield and Cardiff SUMMARY This Centre is designed to support the UK energy sector at a time of fundamental change. The UK needs a knowledgeable but flexible workforce to deliver against this uncertain future. Our vision is to develop a world-leading CDT, delivering research leaders with broad economic, societal and contextual awareness, having excellent technical skills and capable of operating in multi-disciplinary teams covering a range of roles. The Centre builds on a heritage of two successful predecessor CDTs but adds significant new capabilities to meet research needs which are now fundamentally different. Over 80% of our graduates to date have entered high-quality jobs in energy-related industry or academe, showing a demand for the highly trained yet flexible graduates we produce. National Need for a Centre The need for a Centre is demonstrated by both industry pull and by government strategic thinking. More than forty industrial and government organisations have been consulted in the shaping and preparation of this proposal. The bid is strongly aligned with EPSRC's Priority Area 5 (Energy Resilience through Security, Integration, Demand Management and Decarbonisation) and government policy. Working with our partners, we have identified the following priority research themes. They have a unifying vision of re-purposing and re-using existing energy infrastructure to deliver rapid and cost-effective decarbonisation. 1. Allowing the re-use and development of existing processes to generate energy and co-products from low-carbon biomass and waste fuels, and to maximise the social, environmental and economic benefits for the UK from this transition 2. Decreasing CO2 emissions from industrial processes by implementation of CCUS, integrating with heat networks where appropriate. 3. Assessing options for the decarbonisation of natural gas users (as fuel or feedstock) in the power generation, industry and domestic heating system through a combination of hydrogen enhancement and/or CO2 capture. Also critical in this theme is the development of technologies that enable the sustainable supply of carbon-lean H2 and the adoption of H2 or H2 enriched fuel/feedstock in various applications. 4. Automating existing electricity, gas and other vector infrastructure (including existing and new methods of energy storage) based on advanced control technologies, data-mining and development of novel instrumentation, ensuring a smarter, more flexible energy system at lower cost. Training Our current Centre operates a training programme branded 'exemplary' by our external examiner and our intention is to use this as solid basis for further improvements which will include a new technical core module, a module on risk management and enhanced training in inclusivity and responsible research. Equality, Diversity and Inclusion Our current statistics on gender balance and disability are better than the EPSRC mean. We will seek to further improve this record. We are also keen to demonstrate ED&I within the Centre staff and our team also reflects a diversity in gender, ethnicity and experience. Management and Governance Our PI has joined us after a career conducting and managing energy research for a major energy company and led development of technologies from benchtop to full-scale implementation. He sharpens our industrial focus and enhances an already excellent team with a track record of research delivery. One Co-I chairs the UoN Ethics Committee, ensuring that Responsible Innovation remains a priority. Value for Money Because most of the Centre infrastructure and organisation is already in place, start-up costs for the new centre will be minimal giving the benefit of giving a new, highly refreshed technical capability but with a very low organisational on-cost.