Variable speed compressor (VSC) offers a wider range of cooling capacity control according to the cooling load of the system. The on/off controller consumes larger energy as the compressor is always working at maximum speed despites the cooling load and continuously on and off to prevent from over cool the room. This study focused on the implementation of VSC to increase energy efficiency with better temperature control inside the room for split unit air conditioning system. The experiments are done at room temperature of 23 and 24oC with internal heat load of 500 and 1000 W. The proposed system indicates as much 37% of energy saving as compared to on/off controller
Experimental tests were conducted to monitor vehicle air-conditioning system in real life using hydrofluorocarbons (HFC-R134a) and hydrocarbon refrigerant as the working fluid for the compressor. The major variable for this study is vehicle speed. The tests were conducted on a roller dynamometer using a 5 door A-segment hatchback vehicle with a 1.3liter petrol engine to stimulate an actual vehicle on a level road with HVAC unit operating at a temperature set point of 21°C and blower speed at 2. The weight and internal heat load from passengers are taken into considerations with ambient temperature of 30°C and humidity of surrounding conditions at 50-65%. The result shows positive improvements on temperature distribution and fuel conservation with a possibility to be as an alternative refrigerant without any necessity of changing parts in the current system.
The usage of electric compressor inside conventional non-electric vehicle is a new shifts in current vehicle air conditioning system which currently using belt-driven compressor to operate. The usage of belt-driven compressor causes the compressor speed to vary with engine speed rotation, which we cannot control. The usage of electric compressor to replace the belt-driven compressor makes the speed to be according to the cooling load and thus reducing engine load. The current research activity focuses on the development of electric compressor using direct current (DC) from vehicles battery to replace current belt-driven in vehicle air conditioning system. Performance study is focusing on temperature inside cabin, cooling capacity, compressor power consumption and coefficient of performance (COP). The DC compressor speed is varying at 1800, 2000, 2200, 2400, 2500 and 3000 rpm at internal heat load of 1000W with temperature set-point of 20°C. The system uses On/Off controller and compared to belt-driven compressor. The overall experimental results in better energy efficiency at the expense of lower cooling capacity.
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