Fresh air system in accordance with the control of the air flow can be divided into one-way flow systems and two-way flow system between the two slightly different ways of working. Air conditioning and refrigeration market experts, one-way flow system - forced air ventilation, natural air intake, it is a ventilation system, fans of the foul air from the exhaust vent pumped outdoor, outdoor air to maintain pressure balance reduction of air from the air inlet is "sucked" Come supplement, so as to achieve the purpose of changing the wind. Two-way flow system - forced air ventilation, forced air, an air supply system and more than one-way flow system, air inflow is no longer simply rely on air pressure, air inlet are completed by machinery, so deal with than the one-way flow system capacity, but because more than a set of solar power air conditioner units, power and energy consumption correspondingly would increase.
    Two-way flow system functionality is divided into two-way flow of non-heat recovery system and bi-directional flow of heat recovery systems. Refrigeration Express reporter has learned that two-way flow of non-heat recovery system is generally called the new air handling system, referred to as a new fan, increase of an air supply system is compared with one-way flow system, different brands of some new function. Bi-directional flow of heat recovery system, and the difference between the new fan, is called the total heat exchange system, referred to as the switch, fresh solar heating water into the interior after a temperature