Papers by Engr. Prof. Dr. Abdul Shakoor Khan
In this paper, a novel mechanical energy harvester (MEH) based on a movable speed bump, which is ... more In this paper, a novel mechanical energy harvester (MEH) based on a movable speed bump, which is integrated to a rack and gear mechanism with a combination of one-way clutches, is designed, fabricated and tested for application on the road. The device is capable of harvesting the kinetic energy that the decelerating vehicles dissipate in the form of vibrations during impact with the speed bump on the road, not only under loaded but also restoration conditions. The proposed harvester consists of four modules including energy input, transmission, energy conversion and storage. The up-down input motion of the bump is converted into bidirectional rotation by the transmission module, which is further transformed into unidirectional rotation of generator shaft by the continuous engagement and disengagement of oneway clutches. The mechanical energy is converted into electrical power by a DC generator that can be stored in batteries after rectification and used to light up the LED bulbs as electrical load. The operation of the MEH was modelled and simulation study was conducted in Solidworks and Autodesk Inventor to investigate and validate the dynamic response of the mechanism. A prototype was fabricated to determine the feasibility of the design and tests were performed to evaluate the output power from the MEH. A peak output power of 11.99 W and a peak voltage of 20.57 V was achieved at an excitation speed of 120 mm/s and applied force of 150 N. The experimental results were compared with the simulation and were found lying within accordance with each other at similar loading conditions. The proposed device would be able to power road lights, traffic cameras and signals which makes it suitable for application on the road, at the exit of the toll plaza and remote suburbs.
Study of heat and mass transfer under frosting conditions in a new type of surface with augmented... more Study of heat and mass transfer under frosting conditions in a new type of surface with augmented heat transfer due to converging-diverging-flat channels was carried out. Properties of frost under given conditions were ascertained. Results proved 2.5 to 3 times higher coefficients of heat transfer as compared to ordinary finned-tube air-coolers. Results were used by R & D institutes of world repute to develop more effective, cheaper, lighter, energy saving refrigeration equipment for food storage and biotechnology laboratories.
Drafts by Engr. Prof. Dr. Abdul Shakoor Khan
The policy decisions of industrially advanced economies pertaining to mitigation of the threat to... more The policy decisions of industrially advanced economies pertaining to mitigation of the threat to the planet of climate impact due to global warming and ozone depletion have posed a challenge to the all stakeholders of Refrigeration industry. The scientists, engineers, technicians, system manufacturers, component suppliers, end users and operators are equally concerned about the challenge posed by ecological problem. The refrigeration systems of domestic and commercial refrigerators and freezers and comfort heating and cooling of buildings play a major role in the consumption of electrical energy and fossil fuel. For last two decades all stake holders are engaged in finding eco-friendly alternatives of refrigerants. One of the most promising alternative refrigerants is CO2 designated as R-744. In this presentation the problem and its solution is discussed in detail with a review of the state of art technology of refrigeration, heat pump and airconditioning based on R-744 refrigerant.
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Papers by Engr. Prof. Dr. Abdul Shakoor Khan
Drafts by Engr. Prof. Dr. Abdul Shakoor Khan