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  • IOP Publishing  (6)
  • 1
    Online Resource
    Online Resource
    IOP Publishing ; 2020
    In:  IOP Conference Series: Materials Science and Engineering Vol. 884, No. 1 ( 2020-07-01), p. 012105-
    In: IOP Conference Series: Materials Science and Engineering, IOP Publishing, Vol. 884, No. 1 ( 2020-07-01), p. 012105-
    Abstract: This paper presents the friction loss model of a novel double chamber rotary sleeve air compressor (DCRSC) concept. The compressor mechanism is similar to that of rotary compressor whereby the novelty transpires in the instalment of two rotating sleeves and a secured vane that has one end fixed to an outer sleeve and the other end to a rotor, respectively. This Part II of the paper series presents the friction losses analysis of the compressor. Thermodynamic and leakage losses models were respectively presented in Part I and Part III of this paper series. The primary aim of this paper is to formulate and analyse the friction loss model at the radial and axial contact regions of DCRSC at different rotational speed. The variations of the mechanical power and efficiency were evaluated based on the adiabatic, polytropic and isothermal thermodynamic principles as illustrated in Part I of this paper series. Considering the design simplicity of cylindrical shaped components, at maximum rotational speed of 1500 rpm, the DCRSC mechanical efficiencies are 72.43%, 66.2% and 59% when air undergoes adiabatic, polytropic and isothermal compression process, respectively. it is believed that the DCRSC is well suited for compressed air systems and air-conditioning applications.
    Type of Medium: Online Resource
    ISSN: 1757-8981 , 1757-899X
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2506501-4
    Location Call Number Limitation Availability
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  • 2
    Online Resource
    Online Resource
    IOP Publishing ; 2020
    In:  IOP Conference Series: Materials Science and Engineering Vol. 884, No. 1 ( 2020-07-01), p. 012104-
    In: IOP Conference Series: Materials Science and Engineering, IOP Publishing, Vol. 884, No. 1 ( 2020-07-01), p. 012104-
    Abstract: This paper introduces a novel double chamber rotary sleeve compressor (DCRSC) concept. The compression mechanism is basically that of a rotary motion whereby the novelty lies in the usage of a rotating sleeves and a non-sliding vane that has one end fixed to a rotor and the other fixed end to an outer rotating sleeve. The main goal of this paper is to describe the compression processes of air as the working fluid and reveals the variations of pressure, temperature, mass and compression power inside the compressor working chambers at different rotational speed. Friction and leakage model of the proposed compressor are evaluated in Part II and Part III of this paper series. The compressor was theoretically analysed based on three thermodynamic compression approaches namely: adiabatic, polytropic and isothermal approaches. According to the thermodynamic simulation, a 171 cm 3 .rev −1 DCRSC can deliver a 15.4 m 3 .h −1 of compressed air at 9.3 bar, 6.8 bar and 4.9 bar when air undergoes adiabatic, polytropic and isothermal compression processes, respectively. The DCRSC compression mechanism shows a potential capabilities of a new compressor concept and to be well suited for the air conditioning and compressed air systems articles must contain an abstract.
    Type of Medium: Online Resource
    ISSN: 1757-8981 , 1757-899X
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2506501-4
    Location Call Number Limitation Availability
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  • 3
    Online Resource
    Online Resource
    IOP Publishing ; 2020
    In:  IOP Conference Series: Materials Science and Engineering Vol. 884, No. 1 ( 2020-07-01), p. 012106-
    In: IOP Conference Series: Materials Science and Engineering, IOP Publishing, Vol. 884, No. 1 ( 2020-07-01), p. 012106-
    Abstract: This paper presents comprehensive leakage model of a novel double chamber rotary sleeve air compressor (DCRSC). The compressor mechanism is that of a rotary motion whereby the novelty lies in the usage of two rotating sleeves and a secured vane that has one end fixed to an outer sleeve and the other end to a rotor, respectively. The thermodynamic model and friction model of the DCRSC are respectively presented in Part I and Part II of this paper series. The main goal of this study is to formulate and analyse the internal leakage losses at different rotational speed. Dynamic clearance at the contact regions between the high-pressure and low-pressure chambers were made clear. The variations of the internal leakage rate and volumetric efficiency for three compression approaches namely: adiabatic, polytropic and isothermal compression processes were evaluated. At maximum rotational speed of 1500 rpm, the DCRSC volumetric efficiencies are 53.1%, 69.4% and 98% when air undergoes adiabatic, polytropic and isothermal compression process, respectively. The internal leakage losses can effectively be minimized by selecting the right lubricant and reducing the assembly clearances of the rotating parts that defines the compression chambers.
    Type of Medium: Online Resource
    ISSN: 1757-8981 , 1757-899X
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2506501-4
    Location Call Number Limitation Availability
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  • 4
    Online Resource
    Online Resource
    IOP Publishing ; 2014
    In:  Journal of Physics: Condensed Matter Vol. 26, No. 9 ( 2014-03-05), p. 095701-
    In: Journal of Physics: Condensed Matter, IOP Publishing, Vol. 26, No. 9 ( 2014-03-05), p. 095701-
    Type of Medium: Online Resource
    ISSN: 0953-8984 , 1361-648X
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 1472968-4
    detail.hit.zdb_id: 228975-1
    Location Call Number Limitation Availability
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  • 5
    Online Resource
    Online Resource
    IOP Publishing ; 2003
    In:  Journal of Physics: Condensed Matter Vol. 15, No. 29 ( 2003-07-30), p. 4967-4977
    In: Journal of Physics: Condensed Matter, IOP Publishing, Vol. 15, No. 29 ( 2003-07-30), p. 4967-4977
    Type of Medium: Online Resource
    ISSN: 0953-8984 , 1361-648X
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2003
    detail.hit.zdb_id: 1472968-4
    detail.hit.zdb_id: 228975-1
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
  • 6
    Online Resource
    Online Resource
    IOP Publishing ; 2020
    In:  IOP Conference Series: Materials Science and Engineering Vol. 884, No. 1 ( 2020-07-01), p. 012103-
    In: IOP Conference Series: Materials Science and Engineering, IOP Publishing, Vol. 884, No. 1 ( 2020-07-01), p. 012103-
    Abstract: During a surgical procedure, each of the medical staffs would have different postures. Supporting medical staff such as anaesthesiologist would stand in upright condition with straighten-forearm, while medical staff that is performing surgical procedures is in bent-forearm posture. The positioning of forearm might interrupt the air supplies from the ceiling-mounted diffuser, that serves to remove the airborne particles from the surgical zone. Consequently, the movement of particles in the surgical zone is affected, and the tendency of particles to fall onto the patient’s wound is increased. This situation could elevate the chances of a patient contracting surgical site infections and could increase the risk of death. The present study aims to examine the effects of medical staff’s forearm posture on the number of particles falling onto the patient. A simplified computational fluid dynamics (CFD) model of the operating room was developed and validated based on the published data. An RNG k-ε turbulence model based on the Reynolds-Averaged Navier-Stokes (RANS) equations was used to simulate the airflow, while a discrete phase model was used to simulate the movement of the airborne particles. Results show that bent-forearm of medical staff obstructed the downward airflow to remove the particles released by the medical staff. Approximately 37 particles/m3 accumulated in the chest region of the medical staff. A high particle accumulation is also observed at the gap between the staff’s legs due to the stagnant airflow.
    Type of Medium: Online Resource
    ISSN: 1757-8981 , 1757-899X
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2506501-4
    Location Call Number Limitation Availability
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