Energy Saving in Air Conditioning Unit with Single Phase Inverter

Abstract

The objectives of this research are to investigate energy saving of air conditioning unit withsingle phase inverter that controls speed of the compressor and compare to air conditioning unitgenerally used in houses. For the experiment, the room calorimeter was designed and createdaccording to Thai Industrial Standard ISO. 1155-2536.

The experiment was conducted at the same condition, which temperature and humidity beforeentering the fan coil unit were controlled to be constant. It was found that the system with inverterthat controls speed of the compressor can save energy more than the system without inverter. Fromthe experiment condition at sensible heat rate 1,000 W, latent heat 220 W and return air temperaturebefore entering fan coil unit 21 ÌC working for 4 hrs, it showed that energy consumption of airconditioning unit with and without inverters are 1.25 kWh and 1.74 kWh, respectively. This resulted inenergy saving 28.16 % and better constant humidity control, comparing with air conditioning unitgenerally used in houses.

Keywords : Room Calorimeter / Inverter / Energy Saving