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Analysis of leakage factors affecting ECV performance in variable compressor
Mahmud, Md. Iqbal,Cho, Haeng Muk The Korean Society for Energy 2014 에너지공학 Vol.23 No.4
Solenoid operated electromagnetic control valve (ECV) using in an external variable displacement swash plate type compressor is widely used for air conditioning control system because of its low energy consumption and high efficient characteristics. ECV controls the entire vehicle air conditioning system by means of a pulse width modulation (PWM) system that supplied from an external controller. Different pressure ports located within ECV has important functions to control the air/refrigerant flow through its internal passages. The flow paths are preciously maintained with acceptable ranges of leakage (gap) between the parts inside it which is followed by effective design and critical dimensioning of its internal features. Therefore, it saves energy losses from the solenoid operation as well as ensures the balance of forces within it. The research paper highlights analysis of the leakages (at different pressure ports) and dimensioning tolerance factors that affects the ECV performance.
Md.Milon Hossain,Md.Iqbal Mahmud,Md.Shohan Parvez,Haeng Muk Cho 대한환경공학회 2013 Environmental Engineering Research Vol.18 No.3
Treatment of textile wastewater by the electrocoagulation (EC) process is being investigated by this experimental study. The objective of this experiment is to observe the efficiency of the EC process in removing chemical oxygen demand (COD) and turbidity. In this experiment an iron electrode is used in the EC process, and different working parameters such as pH, current density and operating time were studied in an attempt to achieve a higher removal capacity. The results show that the maximum COD removal occurred at neutral pH at operating time 30 min. COD and turbidity removal reaches at maximum, with optimum consumption of electrodes, between current density 85.95 A/m2, and only trace amounts of metals were determined in the EC treated effluent.
Mahmud, Md. Iqbal,Cho, Haeng Muk 대한기계학회 2014 KSME journal Vol. No.
To meet the demand of improved comfort for passengers, drive ability and standard in fuel economy; external variable displacement swash (wobble) plate type compressors are used in automobile air conditioning control system because of their low energy consumption and highly efficient characteristics. It controls the compressor displacement by increasing or reducing the swash plate angle. Solenoid operated electromagnetic control valve (ECV) in the compressor controls the air conditioning system by means of a pulse width modulation (PWM) input signal supplied from an external source (controller). The mechanism changes the swash plate angle by increasing or reducing the pressure of swash plate chamber using the ECV functions. The force (solenoid) for ECV operation is important as the force directly related to the movement of the internal feature i.e. mainly plunger of the ECV which is responsible for the amount of air/refrigerant flow that results the air conditioning control procedures with various pressure ports. The research paper highlights the improved theory and equation for calculating the working force (solenoid force) in ECV and experimental analysis of 3 (three) ECV samples followed by the comparison of theoretical and experimental force results.
Md. Iqbal Mahmud,조행묵 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.5
To meet the demand of improved comfort for passengers, drive ability and standard in fuel economy; external variable displacementswash (wobble) plate type compressors are used in automobile air conditioning control system because of their low energy consumptionand highly efficient characteristics. It controls the compressor displacement by increasing or reducing the swash plate angle. Solenoidoperated electromagnetic control valve (ECV) in the compressor controls the air conditioning system by means of a pulse width modulation(PWM) input signal supplied from an external source (controller). The mechanism changes the swash plate angle by increasing orreducing the pressure of swash plate chamber using the ECV functions. The force (solenoid) for ECV operation is important as the forcedirectly related to the movement of the internal feature i.e. mainly plunger of the ECV which is responsible for the amount ofair/refrigerant flow that results the air conditioning control procedures with various pressure ports. The research paper highlights the improvedtheory and equation for calculating the working force (solenoid force) in ECV and experimental analysis of 3 (three) ECV samplesfollowed by the comparison of theoretical and experimental force results.
Md Tahsin Khan,Araf Mahmud,Md. Muzahidul Islam,Mst. Sayedatun Nessa Sumaia,Zeaur Rahim,Kamrul Islam,Asif Iqbal Korea Genome Organization 2023 Genomics & informatics Vol.21 No.3
Mycobacterium tuberculosis (Mtb) is the causative agent of tuberculosis, one of the most deadly infections in humans. The emergence of multidrug-resistant and extensively drug-resistant Mtb strains presents a global challenge. Mtb has shown resistance to many frontline antibiotics, including rifampicin, kanamycin, isoniazid, and capreomycin. The only licensed vaccine, Bacille Calmette-Guerin, does not efficiently protect against adult pulmonary tuberculosis. Therefore, it is urgently necessary to develop new vaccines to prevent infections caused by these strains. We used a subtractive proteomics approach on 23 virulent Mtb strains and identified a conserved membrane protein (MmpL4, NP_214964.1) as both a potential drug target and vaccine candidate. MmpL4 is a non-homologous essential protein in the host and is involved in the pathogen-specific pathway. Furthermore, MmpL4 shows no homology with anti-targets and has limited homology to human gut microflora, potentially reducing the likelihood of adverse effects and cross-reactivity if therapeutics specific to this protein are developed. Subsequently, we constructed a highly soluble, safe, antigenic, and stable multi-subunit vaccine from the MmpL4 protein using immunoinformatics. Molecular dynamics simulations revealed the stability of the vaccine-bound Tolllike receptor-4 complex on a nanosecond scale, and immune simulations indicated strong primary and secondary immune responses in the host. Therefore, our study identifies a new target that could expedite the design of effective therapeutics, and the designed vaccine should be validated. Future directions include an extensive molecular interaction analysis, in silico cloning, wet-lab experiments, and evaluation and comparison of the designed candidate as both a DNA vaccine and protein vaccine.