- 26,Nallappa Street ,Nehru Nagar,Chrompet
- I am a researcher in Computational fluid dynamics and latent heat storageedit
The thermal comfort of occupants is a necessary requirement for any building. The present pandemic demands us to opt for natural ventilation over air-conditioned spaces to reduce the spread of the infection. This work aims to prevent... more
The thermal comfort of occupants is a necessary requirement for any building. The present pandemic demands us to opt for natural ventilation over air-conditioned spaces to reduce the spread of the infection. This work aims to prevent air-conditioner usage in a commercial building in India during daytime office hours while simultaneously enhancing the thermal comfort of the building occupants through natural ventilation/Phase Change Material (PCM)/insulation techniques. Four building configurations, such as Building A (conventional building with no PCM and no insulation), Building B (building-integrated with PCM), Building C (building-integrated with insulation) and Building D (building-integrated with PCM and insulation) were analysed for various locations using DesignBuilder software. From the results, it is understood that insulation integration is recommended for locations with average nighttime temperatures greater than 27°C, while PCM integration is recommended for locations with an average nighttime temperature less than 27°C during the summer season. Also, nighttime cooling of the building through an air-conditioner is necessary for all locations during summer to maintain adequate thermal comfort with natural ventilation in the daytime. Finally, an appropriate PCM/insulation technique is recommended for an office building located in each location that falls under each type of climate. Hence, the selection of PCM/insulation technique is to be made based on the specific site conditions.
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Abstract Phase change materials (PCMs) have gained much attention due to their high ratio of energy density to mass and their near isothermal behaviour during melting and solidification. Recently, the simulation of solidification and... more
Abstract Phase change materials (PCMs) have gained much attention due to their high ratio of energy density to mass and their near isothermal behaviour during melting and solidification. Recently, the simulation of solidification and melting has been carried out using CFD solvers in various fields including electronic cooling circuits, building envelopes, and other heating, air conditioning and ventilation systems. This article reviews the evolution of the numerical algorithms on solidification and melting through commercial computational fluid dynamic (CFD) software. A guideline for using appropriate melting and solidification algorithm are is required for obtaining accurate and stable solutions. This review work bridges that gap. Errors and stability issues of the numerical schemes for melting and solidification are presented in this work. Also, the error that occurs due to the difference between the complex physics of solidification and melting and their numerical results is addressed in this work. CFD simulation avoids costly experiments, ensures the fastest parametric studies, and also generates the result for almost all points in the domain without disturbing the domain. Thus, the modelling and simulation of PCM-employed thermal energy models using CFD software helps to minimize the time for design and execution as well as the expenditure on the construction of any real-time thermal systems. In this article the algorithm of various types of solvers for melting and solidification, using CFD software and their applications reported by various researchers are discussed in detail. Also, the challenges in micro-scale modelling and future directions in the simulation of solidification and melting are discussed in this review work.
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The thermal comfort of occupants is a necessary requirement for any building. The present pandemic demands us to opt for natural ventilation over air-conditioned spaces to reduce the spread of the infection. This work aims to prevent... more
The thermal comfort of occupants is a necessary requirement for any building. The present pandemic demands us to opt for natural ventilation over air-conditioned spaces to reduce the spread of the infection. This work aims to prevent air-conditioner usage in a commercial building in India during daytime office hours while simultaneously enhancing the thermal comfort of the building occupants through natural ventilation/Phase Change Material (PCM)/insulation techniques. Four building configurations, such as Building A (conventional building with no PCM and no insulation), Building B (building-integrated with PCM), Building C (building-integrated with insulation) and Building D (building-integrated with PCM and insulation) were analysed for various locations using DesignBuilder software. From the results, it is understood that insulation integration is recommended for locations with average nighttime temperatures greater than 27°C, while PCM integration is recommended for locations wi...
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ABSTRACT Stratified storage tanks are vital for the effective storage and retrieval of energy intended for various solar thermal applications. An experimental investigation is carried out to study the stratification behavior during the... more
ABSTRACT Stratified storage tanks are vital for the effective storage and retrieval of energy intended for various solar thermal applications. An experimental investigation is carried out to study the stratification behavior during the charging process, in a packed bed thermal storage unit filled with Phase Change Materials (PCMs) encapsulated spherical capsules. The configuration used in the experimental investigation is modeled, and the stratification behavior is analyzed using the commercially available Computational Fluid Dynamics (CFDs) software FLUENT, and the results are validated using the experimental analysis. The CFD analysis is also performed for a sensible heat storage tank of similar geometrical dimensions. In the CFD analysis, apparent heat capacity method is used to model the phase change phenomenon during the melting process in PCM. The enhancement in the stratification performance in Latent Heat Storage (LHS) system, that considerably increases the charging efficiency, is observed from the present investigation.
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... However the addition of fins will make the system complicated and also increase the frictional ... generalized the HT relationship in such a way that no tracking is required. ... capacity for solving continuous solid phase model by... more
... However the addition of fins will make the system complicated and also increase the frictional ... generalized the HT relationship in such a way that no tracking is required. ... capacity for solving continuous solid phase model by finite difference method using Mathematica software ...
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Jet impingement systems provide an effective means for the enhancement of convective processes due to the high heat and mass transfer rates that can be achieved. The range of industrial applications that impinging jets are being used in... more
Jet impingement systems provide an effective means for the enhancement of convective processes due to the high heat and mass transfer rates that can be achieved. The range of industrial applications that impinging jets are being used in is wide. In the annealing and tempering of materials, impinging jet systems are finding use in the cooling of hot metal, plastic, or glass sheets as well as in the drying of paper and fabric. Compact heat exchangers, with applications in the aeronautical or the automotive sector, often use multiple impinging jets in dense arrangements. In gas turbine applications, jet impingement has been routinely used for a long time. Because of increased thermal efficiency at high turbine inlet temperatures, many gas turbine components, such as rotor disks, turbine vanes and blades, or combustion chamber walls, are operated at temperatures well above highest allowable material limits. In order to assure durability and long operating intervals, effective cooling co...
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Misfire is another type of abnormal combustion. When engine misfires, cylinder (or cylinders) is not producing its normal amount of power. Engine misfire also has negative effects on engine exhaust emissions such as HC, CO, and NOx.... more
Misfire is another type of abnormal combustion. When engine misfires, cylinder (or cylinders) is not producing its normal amount of power. Engine misfire also has negative effects on engine exhaust emissions such as HC, CO, and NOx. Engine misfire should be detected and eliminated. Normal combustion and misfire in the cylinder (if any) generates vibrations in the engine block. The vibration characters due to misfire are unique for a particular cylinder. This can be diagnosed by processing the vibration signals acquired from the engine cylinder block using a piezoelectric accelerometer. The obtained signals were decoded using statistical parameters, like, Kurtosis, standard deviation, mean, median, etc. Misfire identification algorithms such as AdaBoost, LogitBoost, MultiClass Classifier, and J48 were used as tools for feature selection and classification. The signals were trained and tested by the selected classifiers. The classification accuracy of selected classifiers were compare...
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The present trend in building research is to improve sustainability in building construction and operation. The development of new renewable technologies is essential to improve the sustainability and to reduce emissions. The... more
The present trend in building research is to improve sustainability in building construction and operation. The development of new renewable technologies is essential to improve the sustainability and to reduce emissions. The incorporation of phase change materials in buildings is an effective way to reduce the room temperature fluctuations and cooling loads/heating loads. Although several works have been carried out in this field, a novel phase change material clay hollow-brick composite has been used in this work. This article discusses the research on investigating the thermal performance of phase change material integration in building walls. Two identical test rooms (3 m × 3 m × 3.65 m) were constructed to study the effect of phase change material integration in buildings. The experimental buildings were constructed for the warm and humid weather conditions of Chennai city, India. Phase change material integration in the building wall is beneficial for reduction of room tempera...
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In the present work a transient numerical model is developed to investigate and predict the performance of a paraffin phase change material (PCM) in the annular portion of the cylindrical container during its solidification and melting... more
In the present work a transient numerical model is developed to investigate and predict the performance of a paraffin phase change material (PCM) in the annular portion of the cylindrical container during its solidification and melting processes. Enthalpy method of modeling is adopted and the discretised non-dimensional form of governing equations and boundary conditions are solved by implicit finite difference method by using MATLAB software. The temperature variation of PCM along two axes of the polar co-ordinates (r, z) and the time required for solidification are analyzed and presented. The effect of system variables on the performance of the Latent Heat Thermal Energy system ( LHTES) is studied. The model tested finds application in the concept of free cooling which is the process of storing the coldness of the night time ambient air in the LHTES in order to cool the building during the daytime by retrieving the stored cold energy.
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ABSTRACT: Jet impingement systems provide an effective means for the enhancement of convective processes due to the high heat and mass transfer rates that can be achieved. The range of industrial applications that impinging jets are being... more
ABSTRACT: Jet impingement systems provide an effective means for the enhancement of convective processes due
to the high heat and mass transfer rates that can be achieved. The range of industrial applications that impinging jets are
being used in is wide. In the annealing and tempering of materials, impinging jet systems are finding use in the cooling
of hot metal, plastic, or glass sheets as well as in the drying of paper and fabric. Compact heat exchangers, with
applications in the aeronautical or the automotive sector, often use multiple impinging jets in dense arrangements. In
gas turbine applications, jet impingement has been routinely used for a long time. Because of increased thermal
efficiency at high turbine inlet temperatures, many gas turbine components, such as rotor disks, turbine vanes and
blades, or combustion chamber walls, are operated at temperatures well above highest allowable material limits. In
order to assure durability and long operating intervals, effective cooling concepts are required for these highly loaded
components.The current work involves studying of effect of spanwise jet-to-jet spacing on local heat transfer
distribution due to an in-line rectangular array of confined multiple circular air jets impinging on a surface parallel to
the jet plate computationally. Shear Stress Transport (SST) k-ω turbulence model is used. The flow, after impingement,
is constrained to exit in two opposite directions from the confined passage formed between jet plate and target plate.
Mean jet Reynolds numbers based on the nozzle exit diameter (d) covered is 10,000 and jet-to-plate spacings studied
are d, 2d and 3d. Spanwise pitches considered are 2d, 4d and 6d in steps of 2d keeping the streamwise pitch at 5d.
Length-to-diameter ratio of nozzles of the jet plate is 1.0. For all the configurations, the jet-plates have ten spanwise
rows in streamwise direction and six jets in each spanwise row. The results obtained are validated against the
experimental data available in the open literature.
to the high heat and mass transfer rates that can be achieved. The range of industrial applications that impinging jets are
being used in is wide. In the annealing and tempering of materials, impinging jet systems are finding use in the cooling
of hot metal, plastic, or glass sheets as well as in the drying of paper and fabric. Compact heat exchangers, with
applications in the aeronautical or the automotive sector, often use multiple impinging jets in dense arrangements. In
gas turbine applications, jet impingement has been routinely used for a long time. Because of increased thermal
efficiency at high turbine inlet temperatures, many gas turbine components, such as rotor disks, turbine vanes and
blades, or combustion chamber walls, are operated at temperatures well above highest allowable material limits. In
order to assure durability and long operating intervals, effective cooling concepts are required for these highly loaded
components.The current work involves studying of effect of spanwise jet-to-jet spacing on local heat transfer
distribution due to an in-line rectangular array of confined multiple circular air jets impinging on a surface parallel to
the jet plate computationally. Shear Stress Transport (SST) k-ω turbulence model is used. The flow, after impingement,
is constrained to exit in two opposite directions from the confined passage formed between jet plate and target plate.
Mean jet Reynolds numbers based on the nozzle exit diameter (d) covered is 10,000 and jet-to-plate spacings studied
are d, 2d and 3d. Spanwise pitches considered are 2d, 4d and 6d in steps of 2d keeping the streamwise pitch at 5d.
Length-to-diameter ratio of nozzles of the jet plate is 1.0. For all the configurations, the jet-plates have ten spanwise
rows in streamwise direction and six jets in each spanwise row. The results obtained are validated against the
experimental data available in the open literature.
Research Interests:
... However the addition of fins will make the system complicated and also increase the frictional ... generalized the HT relationship in such a way that no tracking is required. ... capacity for solving continuous solid phase model by... more
... However the addition of fins will make the system complicated and also increase the frictional ... generalized the HT relationship in such a way that no tracking is required. ... capacity for solving continuous solid phase model by finite difference method using Mathematica software ...