{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/132584"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/132584","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"A novel heat pump cycle to enable the flexible storage and deployment of harvested waste heat in cold climates","abstract":"The increasing desire for renewable energy and decarbonization demands a transformation in the way we manage thermal and electrical energy in residential HVAC systems. New regulations and an increase in renewable energy participation in our power systems will increasingly incentivize fully electric solutions, flexible loads and load reductions for consumers. A novel heat pump concept is proposed that integrates a PCM-embedded heat exchanger in the injection line of a vapor injection heat pump system. Waste heat may be harvested from drain water or similar source, stored in the PCM and then deployed to heat a residential space using this concept. A system model was constructed for the proposed system as well for two baseline cases. The model demonstrates that when waste heat is directly deployed to the injection line when the heat pump is active, the COP can be increased to 5.0 from the baseline of 3.6. The waste heat utilization in this case is roughly 28%. Waste heat utilization can be much greater when waste heat is harvested and stored in the PCM while the heat pump is inactive. The performance of the heat pump was also simulated during a discharge state however the results are not representative of the true performance due to model stability issues which will be resolved in future work. More work is needed to understand the performance of the proposed heat pump but initial results demonstrate that it has potential to enable significant load reductions in residential settings.","abstract_html":"The increasing desire for renewable energy and decarbonization demands a transformation in the way we manage thermal and electrical energy in residential HVAC systems. New regulations and an increase in renewable energy participation in our power systems will increasingly incentivize fully electric solutions, flexible loads and load reductions for consumers. A novel heat pump concept is proposed that integrates a PCM-embedded heat exchanger in the injection line of a vapor injection heat pump system. Waste heat may be harvested from drain water or similar source, stored in the PCM and then deployed to heat a residential space using this concept. A system model was constructed for the proposed system as well for two baseline cases. The model demonstrates that when waste heat is directly deployed to the injection line when the heat pump is active, the COP can be increased to 5.0 from the baseline of 3.6. The waste heat utilization in this case is roughly 28%. Waste heat utilization can be much greater when waste heat is harvested and stored in the PCM while the heat pump is inactive. The performance of the heat pump was also simulated during a discharge state however the results are not representative of the true performance due to model stability issues which will be resolved in future work. More work is needed to understand the performance of the proposed heat pump but initial results demonstrate that it has potential to enable significant load reductions in residential settings.","abstract_has_math":false,"creators":["Wills, James"],"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":"2025-12","date_published":"2025-12","updated_at":"2026-07-22T22:25:07Z","subjects":["Waste Heat Recovery","TES Integrated Heat Pump"],"languages":["en"],"rights":["Copyright 2025 James Wills"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/132584","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":["Wills, James"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2025-12","2025-12-11"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"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":["Waste Heat Recovery","TES Integrated Heat Pump"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2025 James Wills"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/132584"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The increasing desire for renewable energy and decarbonization demands a transformation in the way we manage thermal and electrical energy in residential HVAC systems. New regulations and an increase in renewable energy participation in our power systems will increasingly incentivize fully electric solutions, flexible loads and load reductions for consumers. A novel heat pump concept is proposed that integrates a PCM-embedded heat exchanger in the injection line of a vapor injection heat pump system. Waste heat may be harvested from drain water or similar source, stored in the PCM and then deployed to heat a residential space using this concept. A system model was constructed for the proposed system as well for two baseline cases. The model demonstrates that when waste heat is directly deployed to the injection line when the heat pump is active, the COP can be increased to 5.0 from the baseline of 3.6. The waste heat utilization in this case is roughly 28%. Waste heat utilization can be much greater when waste heat is harvested and stored in the PCM while the heat pump is inactive. The performance of the heat pump was also simulated during a discharge state however the results are not representative of the true performance due to model stability issues which will be resolved in future work. More work is needed to understand the performance of the proposed heat pump but initial results demonstrate that it has potential to enable significant load reductions in residential settings.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2026-02-19 without embargo terms","The student, James Wills, accepted the attached license on 2025-12-05 at 16:21.","The student, James Wills, submitted this Thesis for approval on 2025-12-05 at 16:30.","This Thesis was approved for publication on 2025-12-11 at 11:57.","DSpace SAF Submission Ingestion Package generated from Vireo submission #23087 on 2026-02-19 at 18:29:47"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["A novel heat pump cycle to enable the flexible storage and deployment of harvested waste heat in cold climates"]}]}],"canonical_facts":{"dc:contributor":["Miljkovic, Nenad"],"dc:creator":["Wills, James"],"dc:date":["2025-12","2025-12-11"],"dc:description":["The increasing desire for renewable energy and decarbonization demands a transformation in the way we manage thermal and electrical energy in residential HVAC systems. New regulations and an increase in renewable energy participation in our power systems will increasingly incentivize fully electric solutions, flexible loads and load reductions for consumers. A novel heat pump concept is proposed that integrates a PCM-embedded heat exchanger in the injection line of a vapor injection heat pump system. Waste heat may be harvested from drain water or similar source, stored in the PCM and then deployed to heat a residential space using this concept. A system model was constructed for the proposed system as well for two baseline cases. The model demonstrates that when waste heat is directly deployed to the injection line when the heat pump is active, the COP can be increased to 5.0 from the baseline of 3.6. The waste heat utilization in this case is roughly 28%. Waste heat utilization can be much greater when waste heat is harvested and stored in the PCM while the heat pump is inactive. The performance of the heat pump was also simulated during a discharge state however the results are not representative of the true performance due to model stability issues which will be resolved in future work. More work is needed to understand the performance of the proposed heat pump but initial results demonstrate that it has potential to enable significant load reductions in residential settings.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2026-02-19 without embargo terms","The student, James Wills, accepted the attached license on 2025-12-05 at 16:21.","The student, James Wills, submitted this Thesis for approval on 2025-12-05 at 16:30.","This Thesis was approved for publication on 2025-12-11 at 11:57.","DSpace SAF Submission Ingestion Package generated from Vireo submission #23087 on 2026-02-19 at 18:29:47"],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/132584"],"dc:language":["en"],"dc:rights":["Copyright 2025 James Wills"],"dc:subject":["Waste Heat Recovery","TES Integrated Heat Pump"],"dc:title":["A novel heat pump cycle to enable the flexible storage and deployment of harvested waste heat in cold climates"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:07Z"}