Experimental investigation on the performance of residential air conditioning system using water condensate for subcooling

Abstract

The experimental investigation of subcooling effects on system COP was carried out on a residential air conditioning using R410A as working fluid, with a compressor capacity of about 0.75 kW. In the experiment, the indoor and outdoor temperatures were controlled at 24°C and 32°C. The results showed that the use of condensate water lowers the refrigerant temperature in the condenser outlet by 2.7°C. By lowering the refrigerant temperature, the cooling capacity of the air conditioning can be enhanced. The decrease in of refrigerant temperature results in COP improvement 16.4%. Besides increasing the COP, the condensate water also decreases the discharge compressor temperature by 7.6°C. The decrease in of the discharge compressor temperature resulted in the decrease in power consumption of the air conditioning system by 5.9%.

Performance of Air Conditioning Unit under Constant Outdoor Wet-Bulb Temperature and Varied Dry-Bulb Temperature

“…For this experiment, the relationship between outdoor air temperature and EER can be expressed as follows EER=-0.228 t DB,OA +17.22. (15) In percentage, each 1℃ increase of outdoor air temperature results in the drop of EER by 2%, averagely. The reduction of EER was also confirmed from an experiment by varying wind orientation in air condenser [21].…”

“…Sumeru et al [14] informed a reduction of exergy loss with the use of ejector for expansion device with refrigerant R290. Meanwhile, an improvement of COP by 16.4% and reduction of energy consumption by 5.9% were reported from an experiment with water condensate to increase refrigerant subcooling in the condenser outlet [15].…”

Evaluation of Split-Type Air Conditioner Performance under Constant Outdoor Moisture Content and Varied Dry-Bulb Temperature

“…Apart from evaporative cooling, the improvement of air conditioner performance could also be made by using nanoparticles [31], increase subcooling [32], and ejector [33]. The use of condensate to increase the liquid refrigerant subcooling has been investigated and proven to improve the COP by 16.4% and reduce the power consumption by 5.9% [34]. By replacing the expansion device with ejector, a decrease of exergy loss from an experiment with R290 air conditioner was reported [35].…”