Study on Energy Efficiency of an Off-Grid Vending Machine with Compact Heat Exchangers and Low GWP Refrigerant Powered by Solar Energy
The purpose of this research is to design an energy-efficient off-grid vending machine that has a refrigeration system powered by an environmentally friendly refrigerant. The paper presents details from the equipment’s design phase in terms of the resistance structure, photovoltaic panels area dimen...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-06-01
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| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/15/12/4433 |
| _version_ | 1797487787413340160 |
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| author | Răzvan Calotă Mihai Savaniu Alina Girip Ilinca Năstase Matei Răzvan Georgescu Oana Tonciu |
| author_facet | Răzvan Calotă Mihai Savaniu Alina Girip Ilinca Năstase Matei Răzvan Georgescu Oana Tonciu |
| author_sort | Răzvan Calotă |
| collection | DOAJ |
| description | The purpose of this research is to design an energy-efficient off-grid vending machine that has a refrigeration system powered by an environmentally friendly refrigerant. The paper presents details from the equipment’s design phase in terms of the resistance structure, photovoltaic panels area dimensioning, but also in terms of the necessary cooling load to be provided by the refrigeration system. The refrigerant chosen was R290 following a comparative analysis, which showed that it has an efficiency 6.6% higher than R134a. During the monitoring periods, the outdoors temperature varied between −4–28 °C, the relative humidity between 22–100% and yet only a slight indoor temperature variation of ±1.5 °C compared to the set value was recorded. The battery module managed to store enough energy from the photovoltaic panels to keep the vending machine functional through three consecutive days with adverse environmental conditions, as evidenced by the low variation of indoor temperature |
| first_indexed | 2024-03-09T23:52:46Z |
| format | Article |
| id | doaj.art-89e7ff4fe5f64b71a58c77e6f3e847e6 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T23:52:46Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-89e7ff4fe5f64b71a58c77e6f3e847e62023-11-23T16:31:04ZengMDPI AGEnergies1996-10732022-06-011512443310.3390/en15124433Study on Energy Efficiency of an Off-Grid Vending Machine with Compact Heat Exchangers and Low GWP Refrigerant Powered by Solar EnergyRăzvan Calotă0Mihai Savaniu1Alina Girip2Ilinca Năstase3Matei Răzvan Georgescu4Oana Tonciu5Department of Thermodynamic Sciences, Faculty of Building Services, Technical University of Civil Engineering Bucharest, 66 Pache Protopopescu Blvd., 020396 Bucharest, RomaniaDepartment of Thermodynamic Sciences, Faculty of Building Services, Technical University of Civil Engineering Bucharest, 66 Pache Protopopescu Blvd., 020396 Bucharest, RomaniaDepartment of Thermodynamic Sciences, Faculty of Building Services, Technical University of Civil Engineering Bucharest, 66 Pache Protopopescu Blvd., 020396 Bucharest, RomaniaDepartment of Thermodynamic Sciences, Faculty of Building Services, Technical University of Civil Engineering Bucharest, 66 Pache Protopopescu Blvd., 020396 Bucharest, RomaniaDepartment of Thermodynamic Sciences, Faculty of Building Services, Technical University of Civil Engineering Bucharest, 66 Pache Protopopescu Blvd., 020396 Bucharest, RomaniaDepartment of Thermodynamic Sciences, Faculty of Building Services, Technical University of Civil Engineering Bucharest, 66 Pache Protopopescu Blvd., 020396 Bucharest, RomaniaThe purpose of this research is to design an energy-efficient off-grid vending machine that has a refrigeration system powered by an environmentally friendly refrigerant. The paper presents details from the equipment’s design phase in terms of the resistance structure, photovoltaic panels area dimensioning, but also in terms of the necessary cooling load to be provided by the refrigeration system. The refrigerant chosen was R290 following a comparative analysis, which showed that it has an efficiency 6.6% higher than R134a. During the monitoring periods, the outdoors temperature varied between −4–28 °C, the relative humidity between 22–100% and yet only a slight indoor temperature variation of ±1.5 °C compared to the set value was recorded. The battery module managed to store enough energy from the photovoltaic panels to keep the vending machine functional through three consecutive days with adverse environmental conditions, as evidenced by the low variation of indoor temperaturehttps://www.mdpi.com/1996-1073/15/12/4433vending machinelow GWP refrigerantenergy efficiencysolar energy |
| spellingShingle | Răzvan Calotă Mihai Savaniu Alina Girip Ilinca Năstase Matei Răzvan Georgescu Oana Tonciu Study on Energy Efficiency of an Off-Grid Vending Machine with Compact Heat Exchangers and Low GWP Refrigerant Powered by Solar Energy Energies vending machine low GWP refrigerant energy efficiency solar energy |
| title | Study on Energy Efficiency of an Off-Grid Vending Machine with Compact Heat Exchangers and Low GWP Refrigerant Powered by Solar Energy |
| title_full | Study on Energy Efficiency of an Off-Grid Vending Machine with Compact Heat Exchangers and Low GWP Refrigerant Powered by Solar Energy |
| title_fullStr | Study on Energy Efficiency of an Off-Grid Vending Machine with Compact Heat Exchangers and Low GWP Refrigerant Powered by Solar Energy |
| title_full_unstemmed | Study on Energy Efficiency of an Off-Grid Vending Machine with Compact Heat Exchangers and Low GWP Refrigerant Powered by Solar Energy |
| title_short | Study on Energy Efficiency of an Off-Grid Vending Machine with Compact Heat Exchangers and Low GWP Refrigerant Powered by Solar Energy |
| title_sort | study on energy efficiency of an off grid vending machine with compact heat exchangers and low gwp refrigerant powered by solar energy |
| topic | vending machine low GWP refrigerant energy efficiency solar energy |
| url | https://www.mdpi.com/1996-1073/15/12/4433 |
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