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  1. Artikel: A novel design, implementation and performance evaluation of the first electronic expansion ejector for energy saving of a mini split air conditioner controlled by inverter

    Elsaid, Ashraf Mimi

    Energy conversion and management. 2022 May 15, v. 260

    2022  

    Abstract: Due to the global warming impact, which has resulted in rising energy costs, it has become vital to adopt energy-efficient air conditioners and improve their performance at a low power consumption rate, which is considered a big challenge. Ejectors have ... ...

    Abstract Due to the global warming impact, which has resulted in rising energy costs, it has become vital to adopt energy-efficient air conditioners and improve their performance at a low power consumption rate, which is considered a big challenge. Ejectors have received much attention over the last decade because of their simplicity, cheap maintenance, high operating capacity, low-temperature handling, no risk of blockage, and longer lifespan at reduced costs. For the first time in the current study, a novel electronic ejector as an expansion device is designed and implemented in conjunction with a mini-split air conditioner that uses the refrigerant R-410A and is controlled by an inverter. The effects of several design and operation factors, such as primary nozzle diameter, primary nozzle length, mixing throttle diameter, capillary tube diameter, capillary tube length, air average velocity, external air temperature, and conditioned space thermal load, are also considered. The study aims to investigate the system performance by integrating a new electronic ejector technology that may be used as an expansion device in conjunction with an inverter-controlled air conditioner. According to the findings, the electronic ejector has a greater COP and saves more energy than the electronic expansion device. Dimensionless correlations of COP and EER incorporating the experimental results are also obtained.
    Schlagwörter administrative management ; air ; air conditioning ; air temperature ; energy efficiency ; energy use and consumption ; longevity ; risk
    Sprache Englisch
    Erscheinungsverlauf 2022-0515
    Erscheinungsort Elsevier Ltd
    Dokumenttyp Artikel
    ZDB-ID 2000891-0
    ISSN 0196-8904
    ISSN 0196-8904
    DOI 10.1016/j.enconman.2022.115603
    Datenquelle NAL Katalog (AGRICOLA)

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  2. Artikel ; Online: Indoor Air Quality Strategies for Air-Conditioning and Ventilation Systems with the Spread of the Global Coronavirus (COVID-19) Epidemic: Improvements and Recommendations.

    Elsaid, Ashraf Mimi / Ahmed, M Salem

    Environmental research

    2021  Band 199, Seite(n) 111314

    Abstract: The coronavirus has come to the world and spread with great wide among the countries of the world and has resulted in numerous infections that exceeded 167,181,023 million patients and are close to 3.5 deaths by September 2021. It also brought with it ... ...

    Abstract The coronavirus has come to the world and spread with great wide among the countries of the world and has resulted in numerous infections that exceeded 167,181,023 million patients and are close to 3.5 deaths by September 2021. It also brought with it panic and fear, halted many activities, and led to the decline of the global economy. It changed human behavior and forced people to change their lifestyles to avoid infection. One of the most sectors that must be taken into consideration through pandemic coronavirus (COVID-19) around the globe is the air conditioning systems. The HVAC systems depend on the air as a heat transfer medium. The air contains a group of pollutants, viruses, and bacteria, and it affects and destroys human life. The air filter plays a major role as an important component in the air conditioning systems. Thus, it requires more effort by researchers to improve its design to prevent the ultra-size of particles loaded with coronavirus (COVID-19). This paper provides insight into the design of existing combined air-conditioners on their suitability and their impact on the spread of the hybrid coronavirus epidemic and review efforts to obtain a highly efficient air filter to get rid of super-sized particles for protection against epidemic infection. In addition, important guideline recommendations have been made to limit the spread of the COVID-19 virus and to obtain indoor air quality in air-conditioned places.
    Mesh-Begriff(e) Air Conditioning ; Air Filters ; Air Pollution, Indoor/analysis ; COVID-19 ; Humans ; Pandemics ; SARS-CoV-2 ; Ventilation
    Sprache Englisch
    Erscheinungsdatum 2021-05-25
    Erscheinungsland Netherlands
    Dokumenttyp Journal Article ; Review
    ZDB-ID 205699-9
    ISSN 1096-0953 ; 0013-9351
    ISSN (online) 1096-0953
    ISSN 0013-9351
    DOI 10.1016/j.envres.2021.111314
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel: Indoor Air Quality Strategies for Air-Conditioning and Ventilation Systems with the Spread of the Global Coronavirus (COVID-19) Epidemic: Improvements and Recommendations

    Elsaid, Ashraf Mimi / Ahmed, M. Salem

    Environmental research. 2021 Aug., v. 199

    2021  

    Abstract: The coronavirus has come to the world and spread with great wide among the countries of the world and has resulted in numerous infections that exceeded 167,181,023 million patients and are close to 3.5 deaths by September 2021. It also brought with it ... ...

    Abstract The coronavirus has come to the world and spread with great wide among the countries of the world and has resulted in numerous infections that exceeded 167,181,023 million patients and are close to 3.5 deaths by September 2021. It also brought with it panic and fear, halted many activities, and led to the decline of the global economy. It changed human behavior and forced people to change their lifestyles to avoid infection. One of the most sectors that must be taken into consideration through pandemic coronavirus (COVID-19) around the globe is the air conditioning systems. The HVAC systems depend on the air as a heat transfer medium. The air contains a group of pollutants, viruses, and bacteria, and it affects and destroys human life. The air filter plays a major role as an important component in the air conditioning systems. Thus, it requires more effort by researchers to improve its design to prevent the ultra-size of particles loaded with coronavirus (COVID-19). This paper provides insight into the design of existing combined air-conditioners on their suitability and their impact on the spread of the hybrid coronavirus epidemic and review efforts to obtain a highly efficient air filter to get rid of super-sized particles for protection against epidemic infection. In addition, important guideline recommendations have been made to limit the spread of the COVID-19 virus and to obtain indoor air quality in air-conditioned places.
    Schlagwörter COVID-19 infection ; Severe acute respiratory syndrome coronavirus 2 ; air ; air conditioning ; air filters ; air quality ; fearfulness ; guidelines ; heat transfer ; human behavior ; humans ; pandemic ; research
    Sprache Englisch
    Erscheinungsverlauf 2021-08
    Erscheinungsort Elsevier Inc.
    Dokumenttyp Artikel
    Anmerkung NAL-AP-2-clean
    ZDB-ID 205699-9
    ISSN 1096-0953 ; 0013-9351
    ISSN (online) 1096-0953
    ISSN 0013-9351
    DOI 10.1016/j.envres.2021.111314
    Datenquelle NAL Katalog (AGRICOLA)

    Volltext online

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    Verfügbar in ZB MED Köln/Königswinter

    Zs.A 726: Hefte anzeigen Standort:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

    Über subito bestellen

    Dieser Service ist kostenpflichtig (siehe Lieferbedingungen von subito). Bestellungen, die einen Artikel nebst Supplementary Material umfassen, werden grundsätzlich wie mehrfache Bestellungen bearbeitet. Gebühren fallen in diesen Fällen für jede einzelne Bestellung an.

  4. Artikel: A critical review of heating, ventilation, and air conditioning (HVAC) systems within the context of a global SARS-CoV-2 epidemic.

    Elsaid, Ashraf Mimi / Mohamed, Hany A / Abdelaziz, Gamal B / Ahmed, M Salem

    Process safety and environmental protection : transactions of the Institution of Chemical Engineers, Part B

    2021  Band 155, Seite(n) 230–261

    Abstract: The Coronavirus disease (COVID-19) has spread over the world, resulting in more than 225 million patients, and 4.7 million deaths in September 2021. It also caused panic and terror, halted numerous activities, and resulted in the world economy ... ...

    Abstract The Coronavirus disease (COVID-19) has spread over the world, resulting in more than 225 million patients, and 4.7 million deaths in September 2021. It also caused panic and terror, halted numerous activities, and resulted in the world economy deteriorates. It altered human behavior and compelled people to alter their lifestyles to avoid infection. Air conditioning systems are one of the most important sectors that must be considered because of the pandemic SARS-CoV-2 all over the world. Air is used as a heat transfer medium in heating, ventilation, and air conditioning (HVAC) systems. The air contains a variety of pollutants, viruses, and bacteria, all of which have an impact on and destroy human life. Significantly in summer, people spend more time in air conditioners which results in lower levels of vitamin D and melatonin which may affect the functioning of their immune system and are susceptible to receiving SARS-CoV-2 from other individuals. As an important component of air conditioning and ventilation systems, the air filter plays a significant role. As a result, researchers must work harder to improve its design to prevent the ultra-small particles loaded with COVID-19. This paper contributes to the design of existing HVAC systems in terms of their suitability and impact on the spread of the hybrid SARS-CoV-2 epidemic, as well as efforts to obtain a highly efficient air filter to remove super-sized particles for protection against epidemic infection. In addition, important guideline recommendations have been extracted to limit the spread of the SARS-CoV-2 throughout the world and to get the highest quality indoor air in air-conditioned places.
    Sprache Englisch
    Erscheinungsdatum 2021-09-20
    Erscheinungsland England
    Dokumenttyp Journal Article ; Review
    ZDB-ID 2008004-9
    ISSN 0957-5820
    ISSN 0957-5820
    DOI 10.1016/j.psep.2021.09.021
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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