Speakers
Description
Energy is the major key to every evidence of modern civilization. Increasing challenges to sustain reliable and durable energy supplies are enforcing us to optimize our usage of these resources. HVAC applications are one of the relatively main fields consuming energy resources. The increasing demand to optimize these systems by researchers needs to simulate this system to easily modify, enhance, and predict its outcomes. A residential AC split unit 1.5hp with inverter technology and R32 refrigerant is tested in a psychrometric lab at different compressor frequencies ranging from 15Hz to 95Hz, indoor unit fan speed levels, ambient conditions 35℃, 43℃ and 46℃ and indoor conditions of 27℃ and 32℃. A set of graphs are concluded to describe best the outcomes of the test and the relation between its main inputs and outputs. It is found that at outdoor dry bulb temperature of 35℃ and air flow rate at the evaporator of 286CFM the EER increases 150% when decreasing the compressor frequency from 95Hz to 15Hz. But when fixing the compressor frequency at 95Hz and changing the air flow rate at the evaporator from 192.4CFM to 314CFM the EER value increases by 113%. When maintaining both fixed frequency at 30Hz and fixed air flow rate at 250CFM but changing the outdoor dry bulb air temperature from 35℃ to 43℃ the EER decreases by 78.6% of its original value. These outcomes are applied to generate a quadratic model “full 2nd-degree polynomial” that predicts best the performance of the AC split unit.