Ravi Ranjan Manjul and V.N Bartaria / Elixir Thermal Engg. 98 (2016) 42656-42661 42656 Introduction The idea of using earth as a heat sink was known in ancient times. In about 3000 B.C., IRANIAN ARCHITECTS used wind towers and underground air tunnels for passive cooling [1, 2]. Underground air tunnels (UAT) systems, nowadays also known as Earth to Air Heat Exchangers have been in use for years in Developed countries due to their higher energy utilization efficiencies compared to the conventional heating and cooling system. Earth -air heat exchanger is a system of work that the thermal inertia of the earth for heating / cooling use of buildings, offices, residential, industrial,etc. or another word of earth-air heat exchangers Are effective as emphatic substitute for these rated can be used for heating / cooling the building. This is a principally a series of metallic, plastic or concrete pipes immerse below the earth at a particular depth. Energy savings of great thought is everywhere a special challenge in the desert climate. The climate of the desert can be classified as hot and dry and such a condition exists in a number of areas around the world. In general, most people probably when the temperature is between 20 ° C and 26 ° C and a relative humidity is ranging from 40 to 60%.These conditions are often achieved by the use of air conditioners. Air conditioning is widely used for the comfort of the occupants and the industrial productions. It can be effectively achieved by vapour compression machines, but to minimize due to the depletion of ozone layer and global warming by chlorofluorocarbons and the need for high-grade energy consumption various passive techniques are now introduced a day, such a process is the earth-to-air heat exchanger. An earth- air heat exchanger consist in one or more pipe/tubes below the earth about 2.5 to 3 m in order to cool in summer climates and pre-heat in winter climates air to be supplied in a building. The physical phenomena of earth-air heat exchanger is simple the ground temperature or undisturbed temperature of earth generally higher than the outdoor air temperature in winter and lower in summer, so it makes the use of the earth suitable as warm or cold sink respectively. Both of the above uses of earth air heat exchanger can pass to reduction in energy consumption. Several researchers have described the earth-to-air heat exchangers (EAHE) coupled with buildings as an effective passive energy source for building space conditioning. An earth- to-air heat exchanger system suitably meets heating and cooling energy loads of a building. Its performance is based upon the seasonally varying inlet temperature, and out let temperature which further depends on the ground temperature or undisturbed temperature. The performance of the EAHE system depends on the temperature and humidity distribution in the soil, as well as to the surface conditions. Working Principal of Earth Tube Heat Exchanger The principle of the basic inertia for heating and cooling using is not a new concept, but a modified concept that goes back to the ancients. This technology has been used throughout history by the ancient Greeks and Persians in the pre-Christian era until recent history (Santamouris and Asimakopoulos, 1996) [3,4,5]. For instance the Italians in the middle Ages used caves called colvoli, to precool /preheat the air before it entered the building. The system, which is currently used, consists of a matrix of on buried pipelines, through the air by a fan / blower. In summer, the supply of ambient air through the tubes to the buildings is due to the fact, cooled, that the undisturbed temperature is lower around the heat exchanger than the ambient temperature. Same as opposite rule of winter climates, the undisturbed temperature is the greater than the ambient temperature and the air gets preheated. Tele: E-mail address: manjulraviranjan@gmail.com © 2016 Elixir All rights reserved ARTICLE INFO Article history: Received: 27 May 2016; Received in revised form: 10 September 2016; Accepted: 20 September 2016; Keywords EAHE, Summer Cooling, Energy Saving, Earth’s Undisturbed Temperature. Earth Air Heat Exchanger Performance in Summer Cooling For Various Supply Air Conditions Ravi Ranjan Manjul 1 and V.N Bartaria 2 Department of Mechanical Engineering, LNCT, Bhopal, (MP), India. ABSTRACT There is a growing interest in heating and cooling systems based on renewable energy. This is the property of earth ground the below about 2.5 to 3 m, the temperature of ground remains nearly constant throughout the year. This constant temperature is called undisturbed temperature of earth. However, a good visualize the undisturbed ground temperature, for a correct interpretation of the geothermal heat exchanger. The undisturbed temperature is very important yourself, which remains higher than the outside temperature in winter and lower than the outside temperature in summer. The EAHEs are considered as an effective passive heating/cooling medium for buildings. It is basically a series of metallic, plastic or concrete pipes buried underground at a particular depth through which the fresh atmospheric air flows and gets heated in winter and supplied to the building if at sufficiently high temperature and vice versa in summer. Until now, many researchers have conducted a series of studies in the development, modelling and testing of systems of the EAHE. This paper observe on earth air heat exchanger in summer cooling for various supply air conditions in summer climate in LNCT Energy Park Raisen Road Bhopal M.P. © 2016 Elixir All rights reserved. Elixir Thermal Engg. 98 (2016) 42656-42661 Thermal Engineering Available online at www.elixirpublishers.com (Elixir International Journal)