Conventional Single Stage Research Articles

EFFECT OF RESIDENTIAL STOVE TECHNOLOGY ON GASEOUS EMISSIONS FROM BIOMASS COMBUSTION

The growing use of biomass for cooking and heating raises environmental concerns about atmospheric air pollution from flue gases emitting during its combustion. In this work, the gaseous emissions from two residential wood stoves were examined. Emissions from conventional single-stage and triple-stage combustion logwood stoves were compared using Eucalyptus grandis (EUG) and Pinus elliottii (PIE) woods as fuels. Carbon monoxide emissions were reduced in 102% and 240%, when PIE and EUG wood logs were burned in triple-stage combustion stove. The triple combustion system showed total volatile organic compounds and formaldehyde emissions higher than obtained in conventional system possibly due to the mixture of both gaseous emissions with water vapor releasing during combustion. The results indicated that the utilization of triple combustion stove with some adjustments would be beneficial to local air quality, individual health and reduced global climate change.

Study on the Service Performance of a Two-Stage Floating-Ring Isolation Seal for a High-Speed Turbopump with a Cryogenic Medium

The reliability and stability of the seal at the fuel-supply end of a rocket-engine turbopump are important factors in determining safety. Conventional single-stage floating rings used for the isolation-sealing of cryogenic media are highly susceptible to operational instability during startup and shutdown, which places demands on the seals’ structure, size, and material properties. In this study, a two-stage floating-ring isolation seal with a non-slotted main sealing surface was designed using a tangential air-intake mode. Based on the full-size three-dimensional finite-volume model, the leakage characteristics of the floating ring during operation were calculated, taking into account the effect of the “inlet effect” on the seal’s performance. Combining the temperature and pressure distributions of the sealing system under cryogenic operating conditions, calculated using a numerical simulation, a reliability analysis of various inlet directions and two kinds of floating-ring schemes was carried out on a self-constructed service-performance test bench. The results indicate that the main wear location of the non-slotted floating ring occurs on the auxiliary sealing surface, with stable working performance. When the inlet direction and spindle-rotation direction are the same, this is more conducive to ensuring the stability of seal performance in practical applications. The results of the current research are instructive for designing floating-ring isolation seals for turbine pumps.

Intelligent System for Body Fat Percentage Prediction

Excessive fats in human body results in obesity, which is generally linked to various illness like heart diseases, diabetes, etc. Therefore, determining the quantity of body fat becomes essential to save the human health. Though numerous approaches are available in determining body fat percentage (BFP), intelligent and accurate models can be designed using artificial intelligence (AI) techniques. Conventional single stage methods utilized particular readings from the body or explanatory parameters in predicting BFP. In this view, this study develops a new Gravitational Search Optimization with Neutrosophic rule-based Body Fat Percentage Prediction model. The presented model intends to appropriately determine the level of BFP in an effective and automated way. To accomplish this, the proposed model follows a two-stage process namely prediction and parameter optimization. At the initial stage, the model derives a new neutrosophic set based rule classifier to determine the BFP. Secondly, the membership function in the rule based model is optimally chosen by the use of GSO algorithm and thereby results in enhanced predictive outcomes of the classification model. A wide ranging simulation analysis is performed and the results are inspected under several dimensions.

Two-stage annealing treatment to uniformly refine the microstructure, tailor δ precipitates and improve tensile properties of Inconel 718 alloy

In order to further improve the tensile properties of Inconel 718 alloy, a novel two-stage annealing method was employed, which involved cold rolling, primary annealing, secondary annealing and aging treatment. The evolution of microstructure and precipitates were analyzed by OM (optical microscope), EBSD (electron backscattered diffraction) and EPMA (electron probe microanalyzer). For the conventional single-stage annealing method, the cold-rolled sample was directly annealed at 950 ℃ for 1 h (0–950 sample). The recrystallization behavior competed with the precipitation of δ phase during annealing, as a result, clustered needle-like δ phases precipitated along a specific direction. Besides, the bimodal distribution of grain size indicated the microstructure of 0–950 sample was not uniform. However, for the two-stage annealed sample, the primary annealing at 1010 ℃ for 45 s lowered the recrystallization barrier, causing the recrystallization behavior prior to the precipitation of δ phase during subsequent secondary annealing at 950 ℃ for 1 h (45s–950 sample). As a result, numerous granular δ particles precipitated along the fresh grain boundaries and uniformly refined grains were obtained in the 45s–950 sample. The 45s–950 sample after aging treatment had an excellent combination of tensile strength (∼1140 MPa) and total elongation (∼25 %) when deformed at 650 ℃. For the room temperature properties, the ultimate strength was about 1490 MPa and the corresponding elongation was ∼ 20 %. The results showed that the appropriate two-stage annealing can improve the microstructure uniformity, refine the grains and tailor the precipitates, all of which were contributors to the enhanced mechanical performance.

A PV-Battery System Resilient to Weak Grid Conditions With Regulated Power Injection and Grid Supportive Features

This paper presents a weak grid coupled single stage photovoltaic (PV) system. The system incorporates a battery energy storage (BES) via a bi-directional DC-DC converter (BDDC). The system does not allow the grid power quality to be deteriorated at nonlinear loading conditions, as well as when the grid voltages are unbalanced or distorted. Moreover, the control scheme is resilient to DC offset in the acquired grid voltage signals due to sensor circuit anomalies. The flexibility afforded by the BES is utilized for several benefits. The intermittent power injection associated with the PV system, is resolved by sustaining the defined grid power at fluctuating PV generation or local loads. The developed control makes use of the BES to adjust the grid power with the feed-in tariffs, adding the capability to act as a power sink at low tariff periods, thus increasing the economic returns. The control avoids overcurrent tripping at large voltage dips and enables fault ride through, whereas the conventional single stage system frequently trips and ceases operation. The system helps the utility at large voltage rise by stopping power flow to the grid while allowing power import from the grid. The BES is prevented from being excessively charged or discharged by the monitored transfer to a recovery mode. Moreover, the dual mode control of the DC link voltage allows peak power extraction from the PV array, while conserving grid power quality. The claimed benefits are evaluated at different operating scenarios using simulated and test results.

Towards strength-ductility synergy through an optimized two-stage solution treatment in Al–7Si–3Cu-0.5Mg alloys

In order to obtain superior mechanical properties, the incipient melting and maximum dissolution of Cu-containing phases, spheroidization and coarsening of eutectic Si phase in Al–Si–Cu–Mg alloy are important factors that should be considered during solution treatment. However, the conventional single-stage solution treatment was difficult to meet this requirement. In this study, an optimized two-stage solution treatment (495 °C/8 h + 515 °C/4 h) was established for Al–7Si–3Cu-0.5 Mg casting alloys through systematically investigating the microstructure evolution at different solution temperatures (470 °C, 495 °C, 515 °C and 525 °C). The first stage (495 °C/8 h) was applied to dissolve most Cu-containing phases and avoid incipient melting, while the employ of the second one (515 °C/4 h) was to promote fast spheroidization of eutectic Si phase and prevent severe overheating. Two modified quality indexes evaluated the synergy of strength and ductility indicated that the optimized two-stage solution treatment and the subsequent aging treatment (175 °C/8 h) gave rise to an optimization (QIU = 537.1 MPa, QIT = 0.47) on the strength and ductility of Al–7Si–3Cu-0.5 Mg alloys, as compared with the alloys (QIU = 527.4 MPa, QIT = 0.46) under the conventional heat treatment including a single-stage solution treatment (515 °C/16 h). The strength-ductility synergy was arisen from the fuller dissolution of Cu-containing phases, the finer eutectic Si phase, the depletion in number density of micropores and the precipitation of nano-sized Q′ and θ′ particles. 0.3 wt% Zr addition further increased the modified quality indexes (QIU = 549.5 MPa, QIT = 0.50), which was attributed to the grain refinement and the formation of nanoscale Al–Si–Zr precipitates. Furthermore, the fracture mechanism of the obtained alloys was also discussed.

Discrete element modelling of multi-stage hydroshearing stimulation in Enhanced Geothermal System

In contrast to the conventional single stage hydraulic stimulation carried out simultaneously on the whole open hole section, the multi-stage stimulation, applying fluid injection on a selected interval of open hole for each stage, may provide an alternative for better reservoir permeability improvement while reducing the maximum seismic event magnitude and preventing short circulation during the production. We presented coupled hydro-mechanical modellings of the hydroshearing process on natural fractures for both the single stage and multi-stage stimulation strategies. The modellings have demonstrated that the single stage stimulation commonly caused the concentration of slip on the fracture with a higher initial aperture, potentially leading to large magnitude events. Adopting the strategy of multi-stage stimulation, it was able to develop the slip zone on multiple fractures and avoid. to induce large slip zone on specific fractures with a high initial aperture. It has been demonstrated there is general effectiveness of the multi-stage stimulation on homogenizing and enlarging the stimulated reservoir area with the lowering of possible maximum seismic event magnitude.

Removal and degradation of mixed dye pollutants by integrated adsorption-photocatalysis technique using 2-D MoS2/TiO2 nanocomposite

Two-dimensional (2D) Molybdenum disulfide (MoS2) has become one of the most exciting areas of research for adsorbents due to its high surface area and abundant active sites. Mainly, 2D MoS2 show promising removal of textile dye pollutants by adsorption process, but it show high affinity for anionic type of dyes, that limits its performance in mixed dye pollutants treatment. Herein, we demonstrate an integrated approach to remove mixed dye pollutants (anionic and cationic) concurrently by combining adsorption and photocatalysis process. We synthesize MoS2/TiO2 nanocomposites for different weight percentages 2.5, 5, 10, 20, 30 and 50 wt% of pre-synthesized flower-like MoS2 nanoparticle by a two-step hydrothermal method. We demonstrate a new process of two-stage adsorption/photocatalysis using high wt% of MoS2 (Stage-I) and low wt% of MoS2 (Stage-II) nanocomposites. The proposed two-stage integrated adsorption and photocatalysis process using 50% and 2.5% of MoS2 coated TiO2, respectively showed complete removal of methylene blue dye ∼5 times faster than conventional single-stage (adsorption or photocatalysis) water treatment process. Furthermore, the feasibility of the proposed two-stage method in mixed dye pollutants removal (anionic and cationic) testified, which showed excellent performance even in doubling the dye pollutant concentration. This work brings a deeper insight into understanding the morphology and concentration of 2-D MoS2 in MoS2/TiO2 nanocomposite in tackling mixed dye pollutants and the possibilities of applying in textile dyeing industries wastewater treatment plants.

Experimental investigation of PV based modified SEPIC converter fed hybrid electric vehicle (PV‐HEV)

SummaryThis paper presents a high gain modified three‐port dual boost single‐ended primary‐inductor converter (SEPIC) converter operated hybrid photovoltaic (PV)/battery electric vehicle to improve the power transfer capability and efficiency of the power conversion stage. The proposed three‐port dual boost high gain SEPIC converter accepts wide voltage range of input then the conventional single stage SEPIC converter. The three‐winding high frequency coupling transformer integrates the two input sources and step‐up the input voltage. The theoretical and experimental analyses are presented to validate the performance of the proposed modified SEPIC converter in boosting the wide range of input voltage. A 6 kW, 12 to 600 V of experimental model has been developed and tested. The efficiency obtained from the designed model is around 94.11%.

Klasik Homojenizasyona Kıyasla Yüksek Enerjili Ultrason Uygulamasının Sütün Homojenizasyon Etkinliğine ve Süt Yağ Globül Boyutuna Etkisi

Sütün yağ globül boyutu, süt ürünlerinin kalitesini özellikle duyusal ve reolojik özelliklerini önemli ölçüde etkilemektedir. Bu sebeple pek çok süt ürününün üretiminde yağ globüllerini küçültmek amacıyla homojenizasyon işlemi uygulanmaktadır. Bu çalışmada, 4 farklı güçte (90W, 180W, 300W ve 400W) 15 dakika süreyle süte uygulanan ultrasonik homojenizasyon işleminin 150 bar basınçta tek kademeli klasik homojenizasyona ve 150/50 bar basınçta çift kademeli klasik homojenizasyona kıyasla yağ globül boyutuna ve homojenizasyon etkinliği üzerine etkisi incelenmiştir. Farklı metotlarla homojenize edilen süt örneklerinin homojenizasyon etkinlik değeri % olarak, lazer kırınımı prensibiyle çalışan cihazlarla Dv 0,99, Dv 0,90, Dv 0,50 hacimsel çap değerleri mikrometre (µm) olarak ve süt yağ globül boyutları nanometre (nm) olarak belirlenmiştir. Ayrıca tüm süt örneklerinde yağ globüllerinin mikroskobik görüntülenmesi gerçekleştirilmiştir. Ultrason işleminin hem tek kademe hem de çift kademe klasik homojenizasyon işlemine göre süt yağ globül çaplarını küçültmede daha etkili olduğu belirlenmiştir. Uygulanan ultrason işleminin gücü arttıkça süt yağ globül çaplarını küçültme etkinliği de artmış ve yağ globül boyutundaki en fazla küçülme 400W 15 dakika ultrason uygulamasında saptanmıştır.

Effect of hybrid (microwave-H2O2) feed sludge pretreatment on single and two-stage anaerobic digestion efficiency of real mixed sewage sludge

The impacts of hybrid microwave-oxidative (MW-H2O2) feed sludge pretreatment on performance efficiency of conventional single-stage and a novel two-stage semi-continuous anaerobic digestion of mixed waste activated sludge were studied to enhance biogas production and digestate quality. Untreated two-stage anaerobic digestion (thermophilic followed by mesophilic) achieved 76.4 ml/gTCOD methane yield compared to 40.4 ml/gTCOD achieved through conventional mesophilic anaerobic digestion, with an increase in methane percentage. Application of hybrid (MW-H2O2) sludge pretreatment in the two-stage digestion enhanced initial sludge hydrolysis/solubilisation and consequently achieved 143.4 ml/gTCOD methane yield. Also, the highest methane percentage of 71 % was achieved during peak methanogenesis stage in this process. The synergetic effects of hybrid pretreatment were also confirmed by the higher release of extracellular polymeric substances. Oxidative stress exerted by the pretreatment resulted in the accumulation of superoxide radicals in the initial thermophilic phase; followed by increased sludge activity and biomethanation in the later phase of two-stage digestion. Hybrid feed sludge pretreatment in the two-stage system achieved a 73 % volatile solids reduction and more than 90 % reduction of faecal coliform. The various kinetic model parameters were determined by the application of the modified Gompertz model. These results illustrate that a novel semi-continuous two-stage anaerobic digester with hybrid feed sludge pretreatment improved sludge hydrolysis, sludge solubilisation, biogas production, sludge stabilization and reduces sludge retention time, and also achieves “class-A” biosolids by significant pathogen destruction.

Low-Noise Broadband CMOS TIA Based on Multi-Stage Stagger-Tuned Amplifier for High-Speed High-Sensitivity Optical Communication

Constrained by the transimpedance limit, the conventional 1-stage shunt-feedback transimpedance amplifier (1S-SF-TIA) suffers poor noise and gain at higher data rates. In this paper, we propose to use a multi-stage stagger-tuned amplifier (MSTA) to constitute TIA (MSTA-TIA), which not only transcends the transimpedance limit of 1S-SF-TIA, but also realizes noise reduction in multiple fronts. First, the high-gain MSTA enables 17X TIA gain over 1S-SF-TIA, which effectively suppresses the white noise. Second, the MSTA realizes at least 2.8X~1.6 lower noise than the conventional multi-stage amplifier, which is essential to form low-noise TIA since the amplifier noise usually dominates. Third, the TIA built upon the 3-stage STA also shows steeper out-of-band roll-off to enable high-frequency noise reduction. Overall, the MSTA-TIA achieves 6.9X and 1.9X noise power reduction over conventional single-stage and multi-stage SF-TIAs. As a demonstration, a 10 Gb/s optical receiver front-end prototype employing proposed MSTA-TIA topology is implemented in a standard $0.18~\mu \text{m}$ CMOS technology. It achieves transimpedance gain of 68.3dB $\Omega $ , electrical bandwidth of 8.5GHz, and excellent input-referred noise current of $0.97~\mu $ Arms. The chip occupies 0.78 mm2 while consuming 43 mA from 1.8 V power supply. The low-noise design methodology in this paper empowers mature CMOS to compete with SiGe to make low-noise high-gain optical IC.

Model evaluation of particle breakage facilitated process intensification for Mixed-Suspension-Mixed-Product-Removal (MSMPR) crystallization

This work studied a system of single stage mixed-suspension-mixed-product-removal (MSMPR) crystallization with particle breakage controlled by wet milling. Conventional single stage MSMPR crystallizer is limited by its degrees of freedom, which makes the process performance largely depend on steady state crystallization rate only tunable by residence time and supersaturation. Breakage brought by wet milling is demonstrated in this work as a supersaturation-independent variable to manipulate steady state conditions. The simulation results show that wet milling can act as a promising process intensification tool that increases process yield and broadens attainable region of particle size. Breakage model is adopted from dry milling and incorporated to high resolution finite volume population balance model. Four cases that cover a wide range of nucleation and growth rates have been tested, and the process yield and particle size are studied as functions of residence time and wet milling tip speeds.

Noise Performance Improvement of Broadband Discrete Raman Amplifiers Using Dual Stage Distributed Pumping Architecture

We demonstrate a novel design of dual stage backward pumped broadband discrete Raman amplifier with distributed pumping architecture which improves the short wavelength noise performance compared with conventional backward pumped single stage design. Overall noise figure (NF) performance has been improved by 2.8 dB over 70 nm bandwidth without introducing forward pumping. Nonlinear phase shift has been numerically calculated and compared with single stage design to evaluate the overall performance improvement. Finally, we report that our proposed dual stage design with ∼14 dB net gain improves low wavelength NF by 3.3 dB providing 1.2 dB Q2 factor improvement and 1134 km reach extension versus a conventional single stage design for 18 × 120 Gb/s PM-QPSK transmission.

Studies on thermodynamic performance of three stage sorption heat transformer

In the present study, a novel four alloys three-stage hydrogen based sorption heat transformer (4A – HSHT) is proposed to achieve higher heating output and efficiency with wide range of operating temperatures. The 4A – HSHT system can able to produce multiple heating outputs compared to conventional single stage metal hydride heat transformer (MHHT) with higher COP. The screening of metal hydrides is carried out to identify the best suited working pair for 4A – HSHT which results in the pair of La0.9Ce0.1Ni5 – MmNi4.4Al0.6 – LaNi4.7Al0.3 – MmNi3.7Co0.7Mn0.3Al0.3 hydrides for operating temperature range of 180 °C for heating output, 140 °C for heat supply and 45 °C for heat sink. The thermodynamic performance of 4A – HSHT is investigated using experimentally measured pressure concentration isotherm (PCI) and thermodynamic properties of chosen metal hydrides. The thermodynamic performance i.e. COP, specific heat output and heating capacity are estimated as 0.75, 81.8 W/kg and 0.9 kW, respectively for 2.75 kg of each alloy with 64 min of cycle time followed by the discussion on effects of heating output temperature on COP and specific heat output. The detailed flow chart demonstrating the methodology of material selection and thermodynamic simulation is presented. In addition, the various issues related to the implementation of practical devices based on metal hydride sorption systems are discussed including recent developments.

A unified single stage ammonia-water absorption system configuration with producing best thermal efficiencies for freezing, air-conditioning and space heating applications

Abstract Various single stage ammonia-water absorption system configurations result in a confusion of determining a better one with better performance. In this paper, a unified single stage ammonia water absorption system configuration for freezing, air-conditioning, and space heating applications is proposed, and it can produce best thermal efficiencies in terms of internal heat recovery under different application conditions. The model of the unified system is established to investigate the operating parameters and the performance of the system under the representative freezing, air-conditioning, and space heating application conditions. The results verify the feasibility of the unified system, and show that the thermal efficiency is improved by 25%, 34%, and 20% respectively, compared to a conventional single stage absorption system. The calculated results also verify the key points of the system operation, which are making the feed saturated, and adjusting a proper split ratio of the strong solution to the rectifier, respectively. The 3D figures of the system thermal efficiency versus the boundary temperatures show the performance and its improvement of the unified system configuration intuitively. The cycle switching diagram is presented and provides a reference for regulating the cycle operation of the unified system.

Absorption seasonal thermal storage cycle with high energy storage density through multi-stage output

Absorption thermal storage is attractive due its small thermal loss during long term storage, which is advantageous for seasonal solar thermal storage. For the long term storage, high energy storage density is favorable to ensure a compact system. In this paper, the novel absorption seasonal thermal storage cycles with multi-stage output processes are proposed. Comparing to the conventional cycle with single stage output, larger concentration glide could be achieved by the proposed cycles under the same condition, resulting in high energy storage density. Performances of the water-LiBr absorption thermal storage cycles with double stage output and triple stage output are calculated and compared with that of the conventional single stage cycle. Energy flows, effects of temperature parameters, and working pair comparison are analyzed. For typical condition of solar thermal charging in summer and heat output in winter with output temperature of 50 °C, the proposed cycles with double stage output and triple stage output have 75.4% and 82.3% less heat losses, and achieve 7.32 times and 6.78 times higher energy storage densities than the single stage cycle. The proposed absorption thermal storage cycle with multi-stage output could be a good option for seasonal solar thermal energy storage.

Improvement of COP with Heat Recovery Scheme for Solar Adsorption Cooling System

Heat recovery ensures optimum usage of the collected energy, and thus, minimizes heat loss for a solar adsorption chiller. Two-bed adsorption chiller with conventional single stage, run by direct solar coupling with heat recovery, has been studied mathematically. In a heat recovery adsorption refrigeration system, to facilitate heat transfer, heat transfer fluid is distributed between two adsorbers maintaining the same mass flow rate. There is no mass transfer between system components during this phase. It is a semi-continuous system performed between two adsorption beds. After completion of desorption/condensation mode, heat transfer fluid is allowed to circulate between the heated desorber and the cooled adsorber. This process distributes some heat of the desorption bed to the adsorber preparing it for the next preheating mode where heat transfer between them is done adiabatically. Consequently, the performance has been checked and a satisfactory increase in the Coefficient of Performance (COP) (approximately 15%) has been detected in the calculated results for the heat recovery operation. It is also observed that the heat recovery process enhances the working hour and overall performances of the solar heat driven adsorption chiller.

Influence of cefazolin contamination on performance of two-stage and single stage anaerobic batch digesters

Anaerobic digestion of animal waste is a well-established technology for on-farm waste management and energy generation. Animal wastes often contain toxic substances such as antibiotic, which have been shown to cause varying degrees of biogas inhibition in single stage (SS) digestion system. Currently, useful information on influence of antibiotic contamination of substrates, particularly cefazolin (CFZ), on two-stage (TS) digestion system is limited. The effect of CFZ antibiotic on performance of two-stage and single batch systems digesting mixture of manure and milk from dairy cow was investigated. Batch experiments were conducted at 55 °C in TS (5 and 15 days for first and second stages, respectively) and SS (20 days) digesters. Cefazolin was added at concentration of 5, 10, 20, 40 and 80 mg/l. Control experiments, with no addition of CFZ were also conducted. In TS system, all concentrations of CFZ exhibited complete or near complete inhibition of hydrogen production in the first stage, with methane reductions of 9.2–56.0% in the second stage as compared with control treatment. Corresponding biogas inhibitions for the system ranged from 7.3–29.1%. The inhibition resulted in reduction of energy recovery by 16.7–60.6%. For SS system, CFZ addition reduced 39.8–68.3% of methane production while total biogas inhibition ranged 24.0–39.0%. The inhibition also resulted in reduction of energy recovery by 39.7–68.3%. Evidently, lower biogas inhibitions and reduction in energy recovery were experienced in TS system as compared with SS system. The results thus suggest that TS system can be an alternative to conventional SS system for on-farm management of CFZ contaminated wastes.

Performance analysis of two stage adaptive FIR Filter Algorithms for PLI and BW artifact cancellation in ECG

Electrocardiogram (ECG) is a measure of the electrical movement of the heart, and is obtained by surface electrodes at standardized locations on the patient’s chest. During acquisition, various artifacts/noises such as power-line interference (PLI), baseline wander (BW), muscle artifacts (MA) and motion artifacts (EM) obscure the ECG. It is important that these artifacts are minimized for the clinicians to make better diagnosis on heart problems. This paper researches the creative idea of adaptive noise cancellation (ANC) using two stage form of adaptive filters. The concept of cascading and its algorithm for real-time application is simulated on MATLAB. The proposed algorithm utilizes two adaptive filters to estimate gradients accurately which results in good adaptation and performance. The objective of the present investigation is to provide solution in order to improve the performance of noise canceller in terms of filter parameters which are obtained with the help of adaptive algorithms. Different kinds of two stage ANC algorithms are used to eliminate artifacts in ECG by considering the noises such as power line interference and baseline wander. The simulation results show that the performance of the two stage ANC is superior to the conventional single stage ANC system in terms of higher signal-to-noise ratio. Two stage adaptive algorithms are applied on real time ECG signals and compared their performance with the conventional single stage adaptive algorithms in terms of parameters Signal-to-Noise Ratio (SNR), Mean Square Error (MSE), Root Mean Square Error (RMSE) and Distortion.