{"id":{"repo_id":"uoit","oai_identifier":"oai:ontariotechu.scholaris.ca:10155/1908"},"canonical_url":"https://search.dev.ndltd.org/etd/uoit/oai:ontariotechu.scholaris.ca:10155/1908","repository":{"repo_id":"uoit","name":"Ontario Institute of Technology","base_url":"https://ontariotechu.scholaris.ca/server/oai/request"},"display":{"title":"Investigation of new KOH and NaOH thermochemical cycles for hydrogen production and carbon capturing","abstract":"Hydrogen production and carbon dioxide removal are two of the critical pieces to achieve ultimate sustainability target. This study develops and investigates four new versions of NaOH and KOH thermochemical cycles to combine hydrogen production and carbon dioxide removal in an integrated and synergistic manner. The sodium hydroxide and potassium hydroxide thermochemical cycles are considered as the base cycles to produce hydrogen by using a nonequilibrium reaction. The proposed new 4-step and 5-step version thermochemical cycles incorporated with carbon capture, are investigated from the energy and exergy perspectives of thermodynamics. Also, these newly developed versions are assessed from techno-economic and environmental perspective in order to reveal the economic feasibility and environmental impact of these cycles. In addition, optimization studies are carried out for the newly proposed versions in order to determine the optimum parameters to carry out the reactions to improve the source utilization and maximize the hydrogen production and carbon removal. Furthermore, newly developed four versions are comparatively assessed with already available two versions of NaOH and KOH thermochemical cycles, in order to see the changes from thermodynamic, chemical, and economic aspects. Calculations showed that heat to hydrogen conversion can be carried out up to 50.36% and 77.09% of energy and exergy efficiencies with the newly developed versions. Significant environmental benefits demonstrated that a kg of hydrogen can be generated between 2 and 2.4 kg of carbon dioxide emissions without carbon capture and up to 19.8 kg of carbon dioxide removal with carbon capture.","abstract_html":"Hydrogen production and carbon dioxide removal are two of the critical pieces to achieve ultimate sustainability target. This study develops and investigates four new versions of NaOH and KOH thermochemical cycles to combine hydrogen production and carbon dioxide removal in an integrated and synergistic manner. The sodium hydroxide and potassium hydroxide thermochemical cycles are considered as the base cycles to produce hydrogen by using a nonequilibrium reaction. The proposed new 4-step and 5-step version thermochemical cycles incorporated with carbon capture, are investigated from the energy and exergy perspectives of thermodynamics. Also, these newly developed versions are assessed from techno-economic and environmental perspective in order to reveal the economic feasibility and environmental impact of these cycles. In addition, optimization studies are carried out for the newly proposed versions in order to determine the optimum parameters to carry out the reactions to improve the source utilization and maximize the hydrogen production and carbon removal. Furthermore, newly developed four versions are comparatively assessed with already available two versions of NaOH and KOH thermochemical cycles, in order to see the changes from thermodynamic, chemical, and economic aspects. Calculations showed that heat to hydrogen conversion can be carried out up to 50.36% and 77.09% of energy and exergy efficiencies with the newly developed versions. Significant environmental benefits demonstrated that a kg of hydrogen can be generated between 2 and 2.4 kg of carbon dioxide emissions without carbon capture and up to 19.8 kg of carbon dioxide removal with carbon capture.","abstract_has_math":false,"creators":["Temiz, Mert"],"institution":"University of Ontario Institute of Technology","degree_name":"Doctor of Philosophy (PhD)","degree_level":null,"degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":[],"advisors":["Dincer, Ibrahim"],"committee_chairs":[],"committee_members":[],"year":2024,"date_issued":"2024-12-01","date_published":"2024-12-01","updated_at":"2026-07-24T05:35:28Z","subjects":[],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/10155/1908","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Dincer, Ibrahim"]},{"key":"dc:creator","label":"Author","values":["Temiz, Mert"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2025-03-18T20:21:43Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2025-03-18T20:21:43Z"]},{"key":"dc:date.issued","label":"Date","values":["2024-12-01"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Doctor of Philosophy (PhD)"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Ontario Institute of Technology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/10155/1908"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Hydrogen production and carbon dioxide removal are two of the critical pieces to achieve ultimate sustainability target. This study develops and investigates four new versions of NaOH and KOH thermochemical cycles to combine hydrogen production and carbon dioxide removal in an integrated and synergistic manner. The sodium hydroxide and potassium hydroxide thermochemical cycles are considered as the base cycles to produce hydrogen by using a nonequilibrium reaction. The proposed new 4-step and 5-step version thermochemical cycles incorporated with carbon capture, are investigated from the energy and exergy perspectives of thermodynamics. Also, these newly developed versions are assessed from techno-economic and environmental perspective in order to reveal the economic feasibility and environmental impact of these cycles. In addition, optimization studies are carried out for the newly proposed versions in order to determine the optimum parameters to carry out the reactions to improve the source utilization and maximize the hydrogen production and carbon removal. Furthermore, newly developed four versions are comparatively assessed with already available two versions of NaOH and KOH thermochemical cycles, in order to see the changes from thermodynamic, chemical, and economic aspects. Calculations showed that heat to hydrogen conversion can be carried out up to 50.36% and 77.09% of energy and exergy efficiencies with the newly developed versions. Significant environmental benefits demonstrated that a kg of hydrogen can be generated between 2 and 2.4 kg of carbon dioxide emissions without carbon capture and up to 19.8 kg of carbon dioxide removal with carbon capture."]},{"key":"dc:title","label":"Title","values":["Investigation of new KOH and NaOH thermochemical cycles for hydrogen production and carbon capturing"]}]}],"canonical_facts":{"dc:contributor.advisor":["Dincer, Ibrahim"],"dc:creator":["Temiz, Mert"],"dc:date.accessioned":["2025-03-18T20:21:43Z"],"dc:date.available":["2025-03-18T20:21:43Z"],"dc:date.issued":["2024-12-01"],"dc:description.abstract":["Hydrogen production and carbon dioxide removal are two of the critical pieces to achieve ultimate sustainability target. This study develops and investigates four new versions of NaOH and KOH thermochemical cycles to combine hydrogen production and carbon dioxide removal in an integrated and synergistic manner. The sodium hydroxide and potassium hydroxide thermochemical cycles are considered as the base cycles to produce hydrogen by using a nonequilibrium reaction. The proposed new 4-step and 5-step version thermochemical cycles incorporated with carbon capture, are investigated from the energy and exergy perspectives of thermodynamics. Also, these newly developed versions are assessed from techno-economic and environmental perspective in order to reveal the economic feasibility and environmental impact of these cycles. In addition, optimization studies are carried out for the newly proposed versions in order to determine the optimum parameters to carry out the reactions to improve the source utilization and maximize the hydrogen production and carbon removal. Furthermore, newly developed four versions are comparatively assessed with already available two versions of NaOH and KOH thermochemical cycles, in order to see the changes from thermodynamic, chemical, and economic aspects. Calculations showed that heat to hydrogen conversion can be carried out up to 50.36% and 77.09% of energy and exergy efficiencies with the newly developed versions. Significant environmental benefits demonstrated that a kg of hydrogen can be generated between 2 and 2.4 kg of carbon dioxide emissions without carbon capture and up to 19.8 kg of carbon dioxide removal with carbon capture."],"dc:identifier.uri":["https://hdl.handle.net/10155/1908"],"dc:language.iso":["en"],"dc:title":["Investigation of new KOH and NaOH thermochemical cycles for hydrogen production and carbon capturing"],"dc:type":["Dissertation"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_name":["Doctor of Philosophy (PhD)"],"thesis:institution_name":["University of Ontario Institute of Technology"]},"updated_at":"2026-07-24T05:35:28Z"}