Size optimization and model study of unshielded groove for outdoor units

 Carries out an enthalph difference chamber experiment, and applies the single factor analysis to explore the effect of each distance between the wall of unshielded groove and the outdoor unit on the thermal environment of outdoor unit, the heat reflux rate and the performance of air conditioning system. Establishes the relationship model between each distance and the inlet air temperature, and obtains the optimized groove size and the outdoor unit placement conditions. The results show that the distance to the left wall and the upper wall has the greater influence on the system performance, followed by the distance to the back wall and the right wall. As the distance to the left wall increases by 400 mm, the relative energy efficiency ratio (EER) increases by about 0.3. With the same distance increased from the right wall, the relative EER increases by less than 0.1. However, when the outdoor dry and wet bulb temperature is 43 ℃ and 26 ℃, the air conditioner will be shutdown as the distance to the front air outlet increases to 100 mm. After optimizing the groove size and the placement of the outdoor unit, the EER of the air conditioner is 97% of that without any obstruction.