HVAC system energy saving in a sample building through synergic Earth-Air Heat Exchanger and closed loop control

Energy consumption was increasing by last a few years in the world. Each countries choose several type of solution for decreasing residential building energy consumption. So ongoing researches are developing a new device called Earth-Air Heat Exchanger (EAHE) aimed at achieving higher efficiency and improved economic competitiveness. One possible way to optimize energy usage is the application of a natural Pre heat/cool coil in a heating, ventilation, air conditioning (HVAC) system. The Proportional, Integral, Derivative (PID) controller is embedded within the HVAC system, so eliminating the need for auxiliary control devices. Based on air and earth temperatures in different seasons the air flow in EAHE can be controlled by Direct Digital Controllers (DDCs). For achieve energy saving we most use one or two line pipe in 1m or 1.5m under the grand surface and cover with soil. After designing of this system we will change PID parameters of DDC to fine tuning of control process regarding to the season and downstream zone temperature. In transition season we can use only the outdoor air passes through the EAHE for direct using in air conditioning system of building. When the system is operating properly we achieve maximum decreasing of energy consumption.