{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/88074"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/88074","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Dynamic modeling, validation, and control for vapor compression systems","abstract":"This thesis traces the complete process of model-based control design for vapor compression systems (VCSs), from nonlinear model development to linearization and control formulation. Addressing gaps in the previous literature, the equations behind each model and control approach are clearly stated and emphasis is placed on conducting experimental validation at every stage. Both finite volume and switched moving boundary approaches for nonlinear control-oriented heat exchanger modeling are presented, illustrating the key differences in the method of discretization between these approaches. Practical considerations for the numerical implementation of these approaches in simulation are also provided. A detailed linearization of the switched moving boundary approach leads to the creation of a family of four-component linear models for different modes of operation of a VCS. The nonlinear and linear models are then validated with experimental data to reveal the tradeoffs of each. Furthermore, an augmentation to the switched moving boundary method is derived which captures the effects of air humidity. Experimental validation demonstrates that this augmented model more accurately predicts both air-side and refrigerant-side outputs at high humidity in addition to providing accurate predictions of liquid condensate formation and air outlet humidity. Finally, the value of the linear VCS models is demonstrated by their application in model-based control. A switched LQR approach is shown in both simulation and experimental application to be capable of driving the system between operational modes in order to regulate about a desired nominal operating condition. In particular, the experiments demonstrate improved robustness at low evaporator superheat of the switched LQR approach as compared to a decentralized PI approach.","abstract_html":"This thesis traces the complete process of model-based control design for vapor compression systems (VCSs), from nonlinear model development to linearization and control formulation. Addressing gaps in the previous literature, the equations behind each model and control approach are clearly stated and emphasis is placed on conducting experimental validation at every stage. Both finite volume and switched moving boundary approaches for nonlinear control-oriented heat exchanger modeling are presented, illustrating the key differences in the method of discretization between these approaches. Practical considerations for the numerical implementation of these approaches in simulation are also provided. A detailed linearization of the switched moving boundary approach leads to the creation of a family of four-component linear models for different modes of operation of a VCS. The nonlinear and linear models are then validated with experimental data to reveal the tradeoffs of each. Furthermore, an augmentation to the switched moving boundary method is derived which captures the effects of air humidity. Experimental validation demonstrates that this augmented model more accurately predicts both air-side and refrigerant-side outputs at high humidity in addition to providing accurate predictions of liquid condensate formation and air outlet humidity. Finally, the value of the linear VCS models is demonstrated by their application in model-based control. A switched LQR approach is shown in both simulation and experimental application to be capable of driving the system between operational modes in order to regulate about a desired nominal operating condition. In particular, the experiments demonstrate improved robustness at low evaporator superheat of the switched LQR approach as compared to a decentralized PI approach.","abstract_has_math":false,"creators":["Pangborn, Herschel C."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Alleyne, Andrew G."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-29T20:38:36Z","date_published":"2015-09-29T20:38:36Z","updated_at":"2026-07-22T22:26:31Z","subjects":["Vapor compression system","Heat exchanger model","Humidity model","Model-based control","Switched linear control"],"languages":["en"],"rights":["Copyright 2015 Herschel Pangborn"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/88074","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Alleyne, Andrew G."]},{"key":"dc:creator","label":"Author","values":["Pangborn, Herschel C."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-29T20:38:36Z","2015-08","2015-07-20","2015-8"]},{"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 at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Vapor compression system","Heat exchanger model","Humidity model","Model-based control","Switched linear control"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2015 Herschel Pangborn"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/88074"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This thesis traces the complete process of model-based control design for vapor compression systems (VCSs), from nonlinear model development to linearization and control formulation. Addressing gaps in the previous literature, the equations behind each model and control approach are clearly stated and emphasis is placed on conducting experimental validation at every stage. Both finite volume and switched moving boundary approaches for nonlinear control-oriented heat exchanger modeling are presented, illustrating the key differences in the method of discretization between these approaches. Practical considerations for the numerical implementation of these approaches in simulation are also provided. A detailed linearization of the switched moving boundary approach leads to the creation of a family of four-component linear models for different modes of operation of a VCS. The nonlinear and linear models are then validated with experimental data to reveal the tradeoffs of each. Furthermore, an augmentation to the switched moving boundary method is derived which captures the effects of air humidity. Experimental validation demonstrates that this augmented model more accurately predicts both air-side and refrigerant-side outputs at high humidity in addition to providing accurate predictions of liquid condensate formation and air outlet humidity. Finally, the value of the linear VCS models is demonstrated by their application in model-based control. A switched LQR approach is shown in both simulation and experimental application to be capable of driving the system between operational modes in order to regulate about a desired nominal operating condition. In particular, the experiments demonstrate improved robustness at low evaporator superheat of the switched LQR approach as compared to a decentralized PI approach.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2015-09-29 without embargo terms","The student, Herschel Pangborn, accepted the attached license on 2015-07-17 at 12:58.","The student, Herschel Pangborn, submitted this Thesis for approval on 2015-07-17 at 12:59.","This Thesis was approved for publication on 2015-07-20 at 13:35.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8532 on 2015-09-29 at 13:23:03","Made available in DSpace on 2015-09-29T20:38:36Z (GMT). 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Both finite volume and switched moving boundary approaches for nonlinear control-oriented heat exchanger modeling are presented, illustrating the key differences in the method of discretization between these approaches. Practical considerations for the numerical implementation of these approaches in simulation are also provided. A detailed linearization of the switched moving boundary approach leads to the creation of a family of four-component linear models for different modes of operation of a VCS. The nonlinear and linear models are then validated with experimental data to reveal the tradeoffs of each. Furthermore, an augmentation to the switched moving boundary method is derived which captures the effects of air humidity. Experimental validation demonstrates that this augmented model more accurately predicts both air-side and refrigerant-side outputs at high humidity in addition to providing accurate predictions of liquid condensate formation and air outlet humidity. Finally, the value of the linear VCS models is demonstrated by their application in model-based control. A switched LQR approach is shown in both simulation and experimental application to be capable of driving the system between operational modes in order to regulate about a desired nominal operating condition. In particular, the experiments demonstrate improved robustness at low evaporator superheat of the switched LQR approach as compared to a decentralized PI approach.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2015-09-29 without embargo terms","The student, Herschel Pangborn, accepted the attached license on 2015-07-17 at 12:58.","The student, Herschel Pangborn, submitted this Thesis for approval on 2015-07-17 at 12:59.","This Thesis was approved for publication on 2015-07-20 at 13:35.","DSpace SAF Submission Ingestion Package generated from Vireo submission #8532 on 2015-09-29 at 13:23:03","Made available in DSpace on 2015-09-29T20:38:36Z (GMT). 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