McQuay Air Conditioning Maintenance Q&A: What is the significance of using outdoor fresh air for cooling?
For general air conditioning projects, apart from those requiring high cleanliness and high precision, they are usually designed to use as much outdoor fresh air as possible for cooling during the transitional seasons (i.e., spring and autumn). When the air condition (temperature, humidity, enthalpy value) of the outdoor fresh air (fresh air) is similar or identical to the indoor air conditioning requirements, fresh air can be fully adopted. The volume of outdoor fresh air gradually increases from 15% to 100%, i.e., from partial fresh air volume to full fresh air volume. When the state of fresh air does not match the indoor air conditioning requirements, only a portion of fresh air is used.
The all-fresh-air air conditioning method only requires filtering the fresh air before it can be used. Since there is no need for cooling and drying, heating and humidifying, etc., it has obvious energy-saving effects.
Source: Beijing McQuay Air Conditioning Maintenance Center http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3774629.