The Design Of A Cost-Saving Air Conditioning System Using Earth Cooled Dehumidification Method

Abdul Talib , Din and Shamsul Anuar, Shamsuddin and Mohd Yusoff , Sulaiman and Dora, Ursee (2007) The Design Of A Cost-Saving Air Conditioning System Using Earth Cooled Dehumidification Method. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The objective of this research is to design a cost-saving air conditioning system which is instead of using outdoor compressor unit to chill and dehumidify the air, is cooled and dehumidified by the earth. Conceptually, in this air-conditioning system, atmospheric air is sucked into the space or room to be conditioned through a filtered opening of a ducting network. The ducting network is entirely (except suction opening piece) installed at least 2m deep underground and is made of highly conductive metal so that it can absorb most of the heat in the atmospheric air that being sucked into the room or space and transfer the heat to the surrounding earth in contact with the external surface of the ducting. The air passage in the underground ducting is designed in such a way that the air flow pattern provides the optimum conditions for the maximum heat transfer such as interface area and retention time. The cooled and dehumidified air from the buried ducting is then distributed evenly into the room or space from underneath the floor area through hundreds of evenly located hidden diffuser holes. The air will then rise up to the ceiling while conditioning the room and partially sucked out by a solar powered axial exhaust fan through the outlet. In ensuring the most efficient design of the system is achieved, the understanding of heat transfer and characteristic of air especially on humidity and temperature is inevitably necessary. As it is expected that this air-conditioning system could not cool down the air lower than the temperature of the earth or medium burying it, the study is focused on analyzing all possibilities of replacing the original soil with the soil that has the highest thermal diffusivity and the use of the sodium chloride solution m order to promote heat diffusivity.

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