Summer Air Conditioning System Working:

Summer air conditioning system is the most important type of air conditioning, in which air is cooled and generally dehumidified. Figure 9.10 shows a schematic arrangement of a typical summer air conditioning system.

The outside air flows through the damper, and mixes up with recirculated air (which is had from the conditioned space). The mixed air passes through a filter for removing dirt, dust and other impurities. The air now passes through a cooling coil, which has a temperature much below the required dry bulb temperature of air in the conditioned space.

The cooled air passes through a perforated membrane and loses its moisture in the condensed form which is collected in a sump. After that, air is made to pass through a heating coil to heat up the air slightly. This is accomplished for bringing the air to the designed dry bulb temperature and relative humidity.

Now the conditioned air is supplied to the conditioned space by a fan. From the conditioned space, a part of the used air is exhausted to atmosphere by the exhaust fans or ventilators. The remaining part of the used air, known as recirculated air, is again conditioned as illustrated in Fig. 9.10. The outside air is sucked and made to mix with the recirculated air in order to make up for the loss of conditioned (or used) air through exhaust fans or ventilators from the conditioned space.