ABSTRACT
Firstly, confluence jet is the ventilation which flows down attached to the vertical wall. The fresh cold air goes into the room from the top inlet, and then flows along the wall to the ground. It gradually replaces the stale air out of the room by forming an “air pool” which is similar to displacement ventilation. After that the opposed jet is the ventilation which use the nozzle setting correspond to the position, then in the vertical direction the air formed a horizontal air layer in the middle of the room after the jet collided. In this air layer, the mean age of the air is quite low, but there also have some serious entrainment phenomenon which is not very ideal. Transition ventilation is to forming the horizontal air layer by bending the air-flow with setting diversion board at an appropriate position. However, the results show that it is still has serious entrainment phenomenon. Stratum ventilation is characterized by forming fresh air layer and sending directly to the breathing zone. The air is supplied by the inlet located on the side
1 INTRODUCTION
The energy consumption of HVAC system accounts for more than 50% of building energy consumption, therefore it has a big potential for energy saving in it. In order to control the energy consumption of the building HVAC system, new standards have been adopted in mainland China and other parts of the world. In general, the ideal temperature for the summer air-conditioning is 25.5°C, the National Development and Reform Commission advocated 26°C as the summer airconditioning temperature. It can be seen that increasing air-conditioning temperature can save energy, but as the air-conditioning temperature rises, there will be an impact on the indoor thermal environment and airflow. It will affect the thermal comfort, increase the energy consumption of HVAC system, and even cause serious harm to human health such as sick building syndrome.
