Academic Projects

In my B. Tech Thesis, we designed and prepared a specialized test rig for evaluating the performance of air conditioning systems using R-22 and R-410A refrigerants. This involved building an insulated room to house the test rig, ensuring controlled environmental conditions for accurate experimentation. Both R-22 and R-410A refrigerants were experimented on the same test rig, operating at ambient temperature under different mass flow rates (half-open and fully open damper conditions). The study revealed that the pressures developed by R-410A at the compressor were nearly 50% higher than those for R-22 under both mass flow conditions. Similarly, the pressures at the throttle valve for R-410A were also approximately 50% higher than for R-22. Consequently, the power input required for R-410A was higher, as more energy is needed for the compressor to achieve the elevated pressures. The exit temperatures at the compressor were higher for R-410A due to these high pressures, while the inlet temperatures were lower compared to R-22, attributed to the superior cooling effect in the evaporator. Additionally, the temperatures at the throttle valve for R-410A were higher under both mass flow conditions. Using identical heat exchangers and similarly designed compressors, the COP (Coefficient of Performance) for R-410A was found to be lower than that of R-22, reflecting the higher energy requirements and thermal characteristics of R-410A. 

• Demonstrated the nonlinear behavior of the beam, including large deformations and chaos, using nonlinear phase portraits, bifurcation diagrams, and frequency sweep analysis.

• Proposed a method to include higher modes of the linearized system in the analysis, providing a more accurate representation of the system's dynamics compared to single-mode approximations.

• Derived equations of motion for the inverted beam pendulum from Lagrangian formulation and reduced the system dynamics to a few modes using approximate functions.

• Highlighted potential applications in energy harvesting and robotic manipulator and various other applications.

• Applied a wind spectrum density model customized to the unique characteristics and requirements of the ALMA antennas.

• Conducted simulations using MATLAB to model the effects of wind loads.

• Compared the simulated PDF with the targeted PDFto verify that  the model accurately reflects real-world conditions.

• Explored the concept of recurrences, observed in natural and social phenomena since ancient times (e.g., Maya calendar).

• Employed recurrence plot technique, a well-established method, alongside recurrence quantification analysis (RQA) to visualize and quantify recurrent patterns in dynamic systems.

• Applied RQA to analyze periodic, quasi-periodic, and chaotic responses, enabling insights into the underlying dynamics of the systems under study.

• Implemented FEA techniques to solve both thermal and structural problems, employing both linear and quadratic elements for analysis.

• Analyzed the influence of the number of elements on the accuracy of the solution. This involved studying how increasing the number of elements affected the convergence of the solution to the exact solution.

• Focused on understanding the temperature distribution on a square fin attached to a base maintained at a constant temperature. 

• Structural analysis involved solving for displacement, bending moment, and shear force in a beam using finite elements.

• Solved analytically using Euler-Bernoulli beam theory, assuming the material to be linear isotropic.

• Simulated numerically using MATLAB to solve the beam's dynamic response.

• Validated both analytical and numerical results through Finite Element Method (FEM) analysis via ANSYS software.

• Application of findings to practical scenarios, specifically using an airplane  as an example of a free-free beam.

• Analyzed the effect of temperature variations on a hollow sphere using principles of thermoelasticity to determine stress and displacement.

• Derived and solved equilibrium equations in spherical coordinates, focusing on a one-dimensional problem without body forces.

• Provided insights into material behavior under thermal stress, crucial for preventing structural failure in high-temperature environments.