Energy conservation in room air conditioner unit by recovering cold energy from condensate.

• Condensate drips from the split air conditioner are circulated along the room inner walls. • Cold energy from condensate is utilized to enhance the room cooling. • Increased cut off time of compressor of air conditioner unit. • Energy saving up to 8% and hence reduced energy cost. Cooling the room with Air Conditioner condensate drips is an energy saving measure. In tropical countries which have 70 to 80% Relative Humidity (RH) year round, the quantity of cool energy in the condensate is significant while room air conditioners are on. These defrost drips at about 10–15 °C is circulated along the inner walls of the room through copper tubes that absorbs the heat from the room walls and reduces the infiltration load. This in turn pre cools the room return air that results in reduction of run time of the air conditioner system, which ultimately reduces the energy consumption of the compressor. For given conditions of Air Conditioner(AC) unit, the condensate temperature, the run time, the return air temperature, supply air temperature and energy saved are tabulated and investigated before and after wall cooling using TEMPTROL Psychrometric software. The investigation reveals that around 6–8% energy savings are achieved through wall cooling. [ABSTRACT FROM AUTHOR]