Experimental investigation of the effects of diffuser's height on flow pattern and energy consumption of the impinging jet ventilation system

Abstract

Nowadays, energy efficiency is regarded as one of the main goals in communities. The highest energy consumption is allocated to the ventilation systems of residential, office, and commercial buildings. Therefore, efforts to research and design systems with lower energy consumption have been prioritized by researchers. The impinging jet ventilation (IJV) system is an example of a layering ventilation system. In this research, the experimental investigation of the IJV system with temperatures of 12 and 16 degrees Celsius and the air inlet diffuser with 40and70 centimeters height from the floor has been accomplished. To investigate this system, the averaged thermal sensation of 8 subjects for the head, hand, feet, and whole body was reported. The results showed that at 12 degrees Celsius, reducing the height of the inlet causes the air to be distributed in a greater radius from the floor. Also, the investigation of the thermal sensation results of the whole body indicated that by changing slightly in the IJV system, energy consumption can be greatly reduced and by adjusting the higher air temperature in this system, a better feeling of coolness can be provided for occupants.