Analysis of Innovative Vapor Compression and Thermal Energy Storage Systems Using Alternative Refrigerants
A Master of Science thesis in Mechanical Engineering by Bahaa Morad entitled, "Analysis of Innovative Vapor Compression and Thermal Energy Storage Systems Using Alternative Refrigerants," submitted in December 2016. Thesis advisor is Dr. Mohamed Gadalla and thesis co-advisor is Dr. Saad A....
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| Format: | doctoralThesis |
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2016
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| Online Access: | http://hdl.handle.net/11073/8711 |
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| _version_ | 1864513434084704256 |
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| author | Morad, Bahaa |
| author_facet | Morad, Bahaa |
| author_role | author |
| dc.contributor.none.fl_str_mv | Gadalla, Mohamed Ahmed, Saad |
| dc.creator.none.fl_str_mv | Morad, Bahaa |
| dc.date.none.fl_str_mv | 2016-12 2017-01-29T06:21:59Z 2017-01-29T06:21:59Z |
| dc.format.none.fl_str_mv | application/pdf application/pdf |
| dc.identifier.none.fl_str_mv | 35.232-2016.47 http://hdl.handle.net/11073/8711 |
| dc.language.none.fl_str_mv | en_US |
| dc.subject.none.fl_str_mv | Innovative refrigeration cycles Phase change materials Thermal energy storage Clathrate hydrates of R134a Energy and exergy analyses Refrigerants Air conditioning |
| dc.title.none.fl_str_mv | Analysis of Innovative Vapor Compression and Thermal Energy Storage Systems Using Alternative Refrigerants |
| dc.type.none.fl_str_mv | info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/doctoralThesis |
| description | A Master of Science thesis in Mechanical Engineering by Bahaa Morad entitled, "Analysis of Innovative Vapor Compression and Thermal Energy Storage Systems Using Alternative Refrigerants," submitted in December 2016. Thesis advisor is Dr. Mohamed Gadalla and thesis co-advisor is Dr. Saad A. Ahmed. Soft and hard copy available. |
| format | doctoralThesis |
| id | aus_3800aca61df76cba9e89869c829a8a40 |
| identifier_str_mv | 35.232-2016.47 |
| language_invalid_str_mv | en_US |
| network_acronym_str | aus |
| network_name_str | aus |
| oai_identifier_str | oai:repository.aus.edu:11073/8711 |
| publishDate | 2016 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| spelling | Analysis of Innovative Vapor Compression and Thermal Energy Storage Systems Using Alternative RefrigerantsMorad, BahaaInnovative refrigeration cyclesPhase change materialsThermal energy storageClathrate hydrates of R134aEnergy and exergy analysesRefrigerantsAir conditioningA Master of Science thesis in Mechanical Engineering by Bahaa Morad entitled, "Analysis of Innovative Vapor Compression and Thermal Energy Storage Systems Using Alternative Refrigerants," submitted in December 2016. Thesis advisor is Dr. Mohamed Gadalla and thesis co-advisor is Dr. Saad A. Ahmed. Soft and hard copy available.This research presents detailed analyses of innovative single and two stages vapor compression refrigeration cycles (VCRCs) as well as a cold thermal energy system (CTES) for residential and commercial cooling applications. Different subcooling systems, such as dedicated mechanical subcooling (DMSC) and liquid-vapor heat exchangers (LVHX) using various refrigerants are investigated and analyzed. Results indicate that subcooling systems have great impacts on increasing the overall energetic and exergetic COPs of VCRC. The energetic and the exergetic COPs of the single stage VCRC with LVHX using R134a are 5.50 and 0.178, respectively. Whereas, for the innovative two stages VCRC with DMSC systems and R134a, energetic end exegetic COPs are found to be 5.83 and 0.189, respectively. A direct contact heat transfer CTES system using R134a-clathrate as a storage medium is investigated experimentally on a single-stage VCRC at different operating conditions. Some of the investigated operating conditions used to evaluate the storage medium behavior (clathrate) and the overall system performance are compressor speed, refrigerant mass flow rate, and different water to refrigerant mass ratios. Using R134a, it is found that at lower refrigerant mass flow rate between 0.5 to 0.8 kg/min, the clathrate is formed at longer durations, and COPs of operating cycles are found to be low compared to VCRCs. At a higher mass flow rate of 1.2 kg/min, the COPs of the CTES systems are found to be between 11.81 and 11.85, which is higher than the corresponding single stage VCRCs with LVHX by 42.5 to 44.5% and higher that the VCRC with DMSC by 41.3% to 43%. Current results show that at lower compressor speed of 2100 rpm and constant R-134a mass flow rate of 1.2 kg/sec, the COP is improved by 17%; whereas, at higher compressor speed of 2900 rpm, the COP is decreased by 23%. At higher water/R134a mass ratios in the crystallizer (storage tank), COPs are found to be decreasing due to the increase in charging times needed to form the clathrate compared to all other cases. Finally, the experimental and simulation results indicate that the CTES systems have higher COPs as compared to innovative VCRCs.College of EngineeringDepartment of Mechanical EngineeringMaster of Science in Mechanical Engineering (MSME)Gadalla, MohamedAhmed, Saad2017-01-29T06:21:59Z2017-01-29T06:21:59Z2016-12info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfapplication/pdf35.232-2016.47http://hdl.handle.net/11073/8711en_USoai:repository.aus.edu:11073/87112025-06-26T12:29:15Z |
| spellingShingle | Analysis of Innovative Vapor Compression and Thermal Energy Storage Systems Using Alternative Refrigerants Morad, Bahaa Innovative refrigeration cycles Phase change materials Thermal energy storage Clathrate hydrates of R134a Energy and exergy analyses Refrigerants Air conditioning |
| status_str | publishedVersion |
| title | Analysis of Innovative Vapor Compression and Thermal Energy Storage Systems Using Alternative Refrigerants |
| title_full | Analysis of Innovative Vapor Compression and Thermal Energy Storage Systems Using Alternative Refrigerants |
| title_fullStr | Analysis of Innovative Vapor Compression and Thermal Energy Storage Systems Using Alternative Refrigerants |
| title_full_unstemmed | Analysis of Innovative Vapor Compression and Thermal Energy Storage Systems Using Alternative Refrigerants |
| title_short | Analysis of Innovative Vapor Compression and Thermal Energy Storage Systems Using Alternative Refrigerants |
| title_sort | Analysis of Innovative Vapor Compression and Thermal Energy Storage Systems Using Alternative Refrigerants |
| topic | Innovative refrigeration cycles Phase change materials Thermal energy storage Clathrate hydrates of R134a Energy and exergy analyses Refrigerants Air conditioning |
| url | http://hdl.handle.net/11073/8711 |