{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/129978"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/129978","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Prototype utilizing elastocaloric phenomena to demonstrate surface-to-air convection cooling cycle with nitinol","abstract":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms","abstract_html":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms","abstract_has_math":false,"creators":["Libes, David"],"institution":"University of Illinois Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Miljkovic, Nenad"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025-07-23","date_published":"2025-07-23","updated_at":"2026-07-22T22:25:06Z","subjects":["Nitinol","Elastocaloric","Cooling","Heating"],"languages":["en","eng"],"rights":["Copyright 2025 David Libes"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/129978","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Miljkovic, Nenad"]},{"key":"dc:creator","label":"Author","values":["Libes, David"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2025-07-23","2025-08"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Nitinol","Elastocaloric","Cooling","Heating"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2025 David Libes"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/129978"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms","The student, David Libes, accepted the attached license on 2025-07-22 at 20:48.","The student, David Libes, submitted this Thesis for approval on 2025-07-22 at 20:51.","This Thesis was approved for publication on 2025-07-23 at 15:48.","DSpace SAF Submission Ingestion Package generated from Vireo submission #22700 on 2025-10-20 at 20:15:41","Heating, ventilation, and air‑conditioning (HVAC) systems are responsible for more than 20 % of global building‐sector energy consumption and rely on high‑GWP refrigerants that leak into the atmosphere [1]. Solid‑state cooling based on the elastocaloric effect in shape‑memory alloys offers a refrigerant‑free alternative with the potential for higher theoretical coefficients of performance. This study investigates Nitinol (Ni‑Ti), a superelastic, shape‑memory alloy whose adiabatic austenite-martensite transformation produces reversible temperature swings when mechanically loaded. An elastocaloric prototype was built to examine the potential for such a future. The prototype cyclically coils a 1 × 2 mm flat Nitinol wire using an electric motor. Preliminary testing and modeling predict a cooling power of ≈10W and an ideal temperature span of ΔT ≈ 2 K under ±4 % surface strain at .25 Hz. Initial experiments confirm the feasibility of achieving the predicted model and show that this design can be refined in the future to achieve better efficiency. Because the current prototype employs rapid‑prototype plastic components for ease of iteration, its thermal mass and structural compliance limit accurate efficiency and fatigue assessments. Ongoing work therefore focuses on replacing key structural parts with aluminum and stainless‑steel inserts to reduce parasitic heat capacity and improve alignment. The ultimate objective is a metal‑dominant architecture capable of exceeding 10⁶ actuation cycles while delivering the predicted cooling power. By demonstrating a scalable path from concept to instrumented hardware, this project advances elastocaloric cooling toward practical, greenhouse‑gas‑free HVAC applications and establishes a platform for which Nitinol prototypes can be constructed that utilize bending rather than tension which has been under explored in literature thus far."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Prototype utilizing elastocaloric phenomena to demonstrate surface-to-air convection cooling cycle with nitinol"]}]}],"canonical_facts":{"dc:contributor":["Miljkovic, Nenad"],"dc:creator":["Libes, David"],"dc:date":["2025-07-23","2025-08"],"dc:description":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms","The student, David Libes, accepted the attached license on 2025-07-22 at 20:48.","The student, David Libes, submitted this Thesis for approval on 2025-07-22 at 20:51.","This Thesis was approved for publication on 2025-07-23 at 15:48.","DSpace SAF Submission Ingestion Package generated from Vireo submission #22700 on 2025-10-20 at 20:15:41","Heating, ventilation, and air‑conditioning (HVAC) systems are responsible for more than 20 % of global building‐sector energy consumption and rely on high‑GWP refrigerants that leak into the atmosphere [1]. Solid‑state cooling based on the elastocaloric effect in shape‑memory alloys offers a refrigerant‑free alternative with the potential for higher theoretical coefficients of performance. This study investigates Nitinol (Ni‑Ti), a superelastic, shape‑memory alloy whose adiabatic austenite-martensite transformation produces reversible temperature swings when mechanically loaded. An elastocaloric prototype was built to examine the potential for such a future. The prototype cyclically coils a 1 × 2 mm flat Nitinol wire using an electric motor. Preliminary testing and modeling predict a cooling power of ≈10W and an ideal temperature span of ΔT ≈ 2 K under ±4 % surface strain at .25 Hz. Initial experiments confirm the feasibility of achieving the predicted model and show that this design can be refined in the future to achieve better efficiency. Because the current prototype employs rapid‑prototype plastic components for ease of iteration, its thermal mass and structural compliance limit accurate efficiency and fatigue assessments. Ongoing work therefore focuses on replacing key structural parts with aluminum and stainless‑steel inserts to reduce parasitic heat capacity and improve alignment. The ultimate objective is a metal‑dominant architecture capable of exceeding 10⁶ actuation cycles while delivering the predicted cooling power. By demonstrating a scalable path from concept to instrumented hardware, this project advances elastocaloric cooling toward practical, greenhouse‑gas‑free HVAC applications and establishes a platform for which Nitinol prototypes can be constructed that utilize bending rather than tension which has been under explored in literature thus far."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/129978"],"dc:language":["en","eng"],"dc:rights":["Copyright 2025 David Libes"],"dc:subject":["Nitinol","Elastocaloric","Cooling","Heating"],"dc:title":["Prototype utilizing elastocaloric phenomena to demonstrate surface-to-air convection cooling cycle with nitinol"],"dc:type":["text"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:06Z"}