Winter Air Conditioning System Construction and Working:

In this system, the air is heated, which is usually accompanied by humidification. The schematic arrangement of winter air conditioning system is shown in Fig. 9.11.

In this system, the outside air flows through a damper and mixes up with the recirculated air coming from the conditioned space. The mixed air is passed through a filter for removing dirt, dust and other impurities. The air is now passed through a preheater so as to avoid the possible freezing of water and to control the evaporation of water in the humidifier. After that, the air is made to pass through a reheat coil to bring the air to the designed dry bulb temperature. Now, the conditioned air is supplied to the conditioned space by fan.

From the conditioned space, a part of the used air is exhausted to atmosphere by the exhaust fans or ventilators.

The remaining used air is again conditioned as shown in Fig. 9.11. The outside air is sucked and made to mix with recirculated air, in order to make up for the loss of conditioned (or used) air through exhaust fans or ventilators from the conditioned space.