INTERNATIONAL JOURNAL OF RESEARCH IN AERONAUTICAL AND MECHANICAL ENGINEERING Vol.2 Issue.7, July 2014. Pgs: 14-20 Mukund Y Pande, Atul Patil 14 ISSN (ONLINE): 2321-3051 INTERNATIONAL JOURNAL OF RESEARCH IN AERONAUTICAL AND MECHANICAL ENGINEERING Comparative Study of Different Passages over Dimpled Plate Evaporator for a Small Water Cooler Mukund Y Pande 1 , Atul Patil 2 1 Department of Mechanical Engineering, Godavari College of Engineering, India, pande21mukund@gmail.com 12 Department of Mechanical Engineering, Godavari College of Engineering, India, patilatul20@rediffmail.com Author Correspondence: 1 GF’S Godavari college of Engineering Jalgaon Maharashtra. India Abstract Bonded coil construction have surface area coming in contact with tank after brazing is small compared with the total surface area of the coil and also there is indirect contact between water to be cooled and the evaporator coils. Due to this type of construction most of the portion of the evaporator coil remains ineffective. Plate coil exchanger has direct surface area connect between two fluids. The whole heat exchanger surface is dipped in one of the fluid so effective area of contact is total surface area. They can be made from stainless steel material to maintain hygienic condition of drinking the water. Cleaning and maintenance of this heat exchanger is so easier. But milk cooler is a good example of dimpled plate heat exchanger so it is proposed to analyze performance of this heat exchanger os an evaporator in small capacity water cooler. Keywords: Evaporator, Dimpled plate. 1. Introduction Water cooler is a common example of refrigeration system observed in day to day life. The purpose of water cooler is to make water available at a constant temperature irrespective of ambient temperature. They are meant to produce cold water at about 7°C to 13°C. It has the primary function of cooling potable water and dispensing it to integral and/or remote areas, by means of a complete mechanical refrigeration system here are three types of water cooler such as storage type, bottler type and instantaneous type water cooler. Out of which storage type water cooler is most popular among all other types. Refrigeration system of water cooler consists of different components as follows Hermetic compressors are commonly used for both 50 and 60 Hz AC applications. Compressors are similar to those used in household refrigerators. Forced air-cooled condensers are most commonly used. Capillary tubes are used almost exclusively for refrigerant flow control in hermetically sealed systems. This water cooler has the evaporator formed by refrigerant tubing bonded to the outside of a storage tank; such evaporator is called bonded coil evaporator. This bonded coil construction has