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Session 13: Power generation - System/Cycle design and optimisation
11:15am - 12:35pm
Session Chair: Kevin Glass
Location:Main Conference Webinar Stream This is the main Go to Webinar conference stream. It will broadcast the paper presentations, keynote presentations, short course and opening and closing sessions
Four papers will be presented. Click on the session title to see the full details.
11:15am - 11:35am
Latent Heat And Thermochemical Storage As Enablers For Waste Heat-to-Power And Heat-Upgrade: A General Approach
Most excess heat/cold in industrial processes is unrecovered due to intermittency and variability in grades and amounts, which complicates the heat-to-power conversion and heat upgrade using traditional technologies. The decoupling of heat sources/sinks and thermal power utilisation via generation/heat upgrade enabled by the integration of a suitable storage system has the potential to address the challenges. The aim of this study is to develop a framework based on heat storage (latent and thermochemical), heat-to-power (organic/steam Rankine cycle, etc.) and/or heat upgrade (heat pumps, etc.) options for the utilization of the industrial waste heat. A wide temperature range is considered which spans applications from the food to the steel sectors. Based on an extensive literature survey, mutual links are established on the basis of temperature and illustrated in maps. This facilitates the primary screening of the latent heat and thermochemical storage systems for heat to power and heat upgrade applications. With such generalized maps, the application of the Rankine cycle (both direct and reverse) using refrigerants in relationship to the thermal energy storage technologies is discussed.
11:35am - 11:55am
Development of a Compressed Heat Energy Storage System Prototype
1Tecnalia Research & Innovation; 2German Aerospace Center (DLR); 3Ghent University; 4Universitat Politecnica de Valencia, Zagazig University
Compressed Heat Energy Storage (CHEST) systems are a specific variant of Pumped Thermal Energy Storage systems (PTES) based on the Rankine cycle. The CHEST system described in this work consists of a high-temperature heat pump, a high-temperature thermal energy storage system combining both latent and sensible heat storages, and an organic Rankine cycle system. The use of working fluids with a low global warming potential and zero ozone depleting potential are also considered. In this paper the design and operation modes of a CHEST system concept are presented. A numerical model was developed in TRNSYS software, which served to analyse the system´s capabilities not only as a promising power-to-heat-to-power system able to achieve high electrical roundtrip efficiencies, but also as a highly flexible energy storing system when coupled to a Smart District Heating (DH) installation. Finally, recommendations for the definition of an experimental set-up for the validation of the CHEST concept are provided.
11:55am - 12:15pm
Refrigerant Lubricant Interaction In High-Temperature Heat Pump And Organic Rankine Cycle Systems
Cotter, Donal F; Shah, Nikhilkumar; Hewitt, Neil; Huang, Ming J
Ulster University, United Kingdom
High-Temperature Heat Pumps (HTHPs) and Organic Rankine Cycles (ORCs) are well defined technologies used in energy conversion. Ongoing research and development of equipment and processes is enabling the operating envelope of these technologies to be extended to achieve higher temperatures and pressures. Lubricant plays a key functional role within primary plant, namely compressors and expanders preventing damage and wear, while also sealing, preventing corrosion and reducing energy requirements. These lubricant oils need to interact with low global warming potential refrigerant combinations without negating operational performance or damaging plant and equipment. An evaluation of these refrigerant lubricant compositions through testing is essential to ensure optimum performance is maintained within operational limits. This study is linked to an EU project CHESTER (Compressed Heat Energy STorage for Energy from Renewable sources) and reviews research based on HTHPs and ORCs that serves to provide a bases to understand integration of lubricant basestocks and working fluids to meet the demands of high temperature applications.
12:15pm - 12:35pm
What Will Professor Rankine Inspire In You?
Spanswick, Ian David
O2RC Solutions, United States of America
Professor Rankine and his perspectives have been central to my career. Following in my father’s footsteps and from beginnings in the UK, via France to eventually emigrating to the USA, this paper provides an overview of just some of the ideas that I was part of, the places, equipment and experiences this provided. My hope is that by exploring these less traditional industrial refrigeration and ORC ideas this might inspire solutions to the new challenges currently facing humanity.