International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 04 | Apr 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 294 Design and Analysis of Heat Exchanger with Nano Coating Naveen Kumar, Parthiban, Nikhil Britto, Bramwell Richaredsion Mechanical Department, Loyola Institute of Technology, Chennai-600123, Tamil Nadu, India. ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - Nowadays heat exchangers are used commonly in industries to transfer heat. The transferring of heat is carried out by two process such as convection and radiation. Due to convection and radiation, the wear and tear will be obtain on surface of heat exchanger. So, it reduces the efficiency of heat exchanger to transfer the heat. Also the life expectancy of the heat exchanger will be reduce. Therefore the surface area of heat exchanger is going to modify which means coating will be done on surface area. Because of coating, the surface area of heat exchanger is increased, so the heat transfer rate also increased. Our project aims to do analysis of two material such as MgzrO8 with Ni Cr alloy which are used for coating on surface area of heat exchanger and find out which material is suitable to heat exchanger to transfer the heat. This will be done by using ANSYS software. Key Words: Heat exchanger, Nano Coating, Nano Materials (MgZrO8, Ni-Cr alloy), Blasting, Thermal Spray method, Analysis, ANSYS software, CATIA for design 1. INTRODUCTION Heat exchanger is a device which is used to transfer heat from one region to another region easily. Heat exchangers are made up of copper and aluminium alloys. Because of their higher thermal conductivity and thermal expansion properties. There are lots of types of heat exchangers available for transferring the heat. Shell and tube heat exchanger is used mostly in industries. They are widely used in refrigeration system, thermal power plant, air conditioning, internal combustion engines, petroleum refineries, etc. For an example, taking internal combustion engine, the coolant flows through radiator coils and air (from blower fan) flows past the coils, which cools the coolant and heats the incoming air. In most heat exchangers, heat transfer between fluids takes place through a separating wall or into and out of a wall in a transient manner. In many heat exchangers, the fluids are separated by a heat transfer surface, and ideally they do not mix or leak. Such exchangers are referred to as direct transfer type, or simply recuperators. In contrast, exchangers in which there is intermittent heat exchange between the hot and cold fluids via thermal energy storage and release through the exchanger surface or matrix are referred to as indirect transfer type, or simply regenerators. Such exchangers usually have fluid leakage from one fluid stream to the other, due to pressure differences and matrix rotation/valve switching. Common examples of heat exchangers are shell and tube exchangers, automobile radiators, condensers, evaporators, air preheaters, and cooling towers. If no phase change occurs in any of the fluids in the exchanger, it is sometimes referred to as a sensible heat exchanger. 2. RADIATION AND CONVECTION 2.1 Radiaton Thermal radiation, also known as heat, is the emission of electromagnetic waves from all matter that has a temperature greater than absolute zero. It represents the conversion of thermal energy into electromagnetic energy. Thermal energy consists of the kinetic energy of random movements of atoms and molecules in matter. All matter with a temperature by definition is composed of particles which have kinetic energy, and which interact with each other. These atoms and molecules are composed of charged particles, i.e., protons and electrons, and kinetic interactions among matter particles result in charge-acceleration and dipole-oscillation. This results in the electrodynamic generation of coupled electric and magnetic fields, resulting in the emission of photons, radiating energy away from the body through its surface boundary. 2.2 Convection Convection is the heat transfer due to the bulk movement of molecules within fluids such as gases and liquids. Convection includes sub-mechanisms of advection (directional bulk-flow transfer of heat), and diffusion (non-directional transfer of energy or mass particles along a concentration gradient). Convection cannot take place in most solids because neither bulk current flows nor significant diffusion of matter can take place. Diffusion of heat takes place in rigid solids, but that is called heat conduction. Convection, additionally may take place in soft solids or mixtures where solid particles can move past each other. 3. NANOCOATING MATERIALS AND METHOD The following nano particles are used to coating process and there are 1. Magnesium Zirconium Oxide (MgZrO8) 2. Nickel Chromium Alloy (Ni-Cr) 3.1 Properties of Magnesium Zirconium Oxide 1. Chemical formula - MgZrO8 2. Molar mass - 40.304 g/mol 3. Density - 7870 kg/m3 4. Melting point - 2852°C