Modelling and Optimization of Direct Expansion Ac

Applied Energy 87 (2010) 1158–1175

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Energy efficient fuzzy based combined variable refrigerant volume and variable air volume air conditioning system for buildings
R. Karunakaran a, S. Iniyan b,*, Ranko Goic c a Department of Mechanical Engineering, Anna University Tiruchirappalli-Thirukkuvalai campus, India Institute for Energy Studies, Department of Mechanical Engineering, Anna University Chennai, Chennai, India c Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Split, Croatia b a r t i c l e

i n f o

a b s t r a c t
Energy conservative building design has triggered greater interests in developing flexible and sophisticated air conditioning systems capable of achieving enhanced energy-savings potential without sacrificing the desired thermal comfort and indoor air quality (IAQ). This research work greatly aimed at achieving enhanced energy conservation, good thermal comfort and better IAQ for space conditioning with the application of combined variable refrigerant volume (VRV) and variable air volume (VAV) air conditioning (A/C) systems. Experimental investigation on the proposed combined air conditioning system with the application of intelligent fuzzy logic controller was performed for summer and winter climatic conditions to substantiate the energy-savings capability. The proposed system experimentally analyzed under fixed ventilation, demand controlled ventilation (DCV) and combined DCV and economizer cycle (EC) ventilation techniques effectively conserved 44% and 63% of per day average energy-savings in summer and winter design conditions respectively, while compared to the conventional constant air volume (CAV) A/C system. The results of the present investigation have proved that the proposed combined air conditioning system operated under the different ventilation strategies

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