它的工作原理是这样的:ERV的机柜中有两个风扇，一个热交换器和一个干燥剂. The outside air fan (1) draws air in from the outdoors; the Exhaust fan (2) draws air in from the home and the heat exchanger (3) heats or cools the incoming outside air while the desiccant removes humidity.
为了帮助控制室内空气污染，必须有新鲜的室外空气. 引入外部空气的问题是，天气要么炎热潮湿，要么寒冷. If we didn’t pre-treat it we would need to upsize the 韦德1946官方 equipment to handle the extra load; not a very good way to 省钱!
上图所示的ERV在供暖季节(冬季)运行。. 暖空气(你花钱加热的空气)通过管道通过浴室和厨房等正常的排气场所进入. 这是你在户外已经耗尽的空气，没有回收任何用来加热它的能量. 较低, 每次你打开排气扇，你用来加热或冷却的空气就被浪费在户外!
ERV通过1号风扇吸入外部空气. 这种冷空气通过热交换器沿着室内的温暖空气. The warm indoor air gives up some of its heat and warms the outside air; this newly warmed outside air is directed through a desiccant where humidity is greatly reduced and then it is piped directly into the return air of your central 韦德1946官方 system!
The warm inside exhaust air and the outdoor air are never in direct contact with each other; so all the bad smells associated with bathroom and kitchen exhaust fans go outside where they belong but we “recover” some of the heat so it isn’t all wasted!
Fresh outdoor air is the single most important component to a healthy home; and an ERV is the most cost effective way to treat outside air.
在降温季节(夏季)唯一的区别是，室内凉爽的空气是用来冷却室外热空气的. The airflow remains the same so there are no complicated mechanical systems to switch over or think about; in fact the only thing that needs regular maintenance are the filters.