Traffic Police Booth Lab Report

An Arrangement to Ensure Optimum Temperature of Traffic Police Booth
K. Augustine Babu and P. Sherjin Department of Mechanical Engineering, Sri Ramakrishna Institute of Technology, Coimbatore, Tamil Nadu, India

Abstract The temperature of the traffic police booth is found to be at an elevated level during hot sunny days, which may cause discomfort to the person who is standing under it. Lowering this high inside temperature of the booth is the central theme of this work. Semi-conductor based thermoelectric modules can be used to alter the temperature of the booth to a considerable extent, with respect to the ambient condition. For designing of this unit, water is stored in a reservoir placed beneath the booth and is circulated through
On passing direct current through the n and p-type pairs of semiconductor materials, refrigeration by thermoelectric modules is achieved. When the current passes from the n-type to the p-type, cooling occurs. Cooling occurs when the heat is absorbed from the environment. This cooling occurs when electrons move from the p-side to the n-side of the material, through the interconnecting conductor. Electron transport cause the absorbed heat to be transferred. The liberaton of the absorbed heat occurs, when the electrons jump to the lower energy p-type material. This process is called as the Peltier effect. Just by applying a low DC voltage to this module, one surface gets cold and the other surface gets hot. And just by reversing the applied DC voltage, the heat moves to the other direction. Thus, this thermoelectric device works as a heater or a cooler. Higher the differential temperature, higher the electric power and electromotive force. When the electrical connections between two modules were serial, the power generated was more (N. Sangwaranatee and N. W. Sangwaranatee, 2015). Inorder to verify the Peltier effect heat pump, a refrigeration system was designed and
Thermal designs of better design is ensured by this model (Chakib Alaoui, 2011). Water cooling is a method of heat removal from components and industrial equipment. As opposed to air cooling, water is used as the heat conductor. Free cooling can be provided by circulating water between ground heat exchanger (GHE) and the indoor directly (Yi Man and Hongxing Yang, 2015). The main mechanism for water cooling is transfer or circulation. In this project water was stored in reservoir and pumped to roof after return to reservoir. Evaporative cooling is a high temperature cooling solution that can save energy compared to refrigerant cooling systems and also, provide more cooling reliability than mechanical or natural ventilation system without cooling (Michal Pomianowski, Christian Hede Andersen and Per Heiselberg, 2015). An evaporative cooler produces effective cooling by combining natural process- water evaporation with a simple, reliable air moving system. Evaporative cooling is the most economical and effective means of refrigeration and air cooling since its inception particularly in the areas where climatic conditions are warm and dry (Poonia M.P., Bhardwaj A., Upender Pandel