Modern houses require Air Condition in summer and heating in winter time , It also require fresh air flow for removing unwanted gasses and smells.

When temperature and humidity gradients between the outside and inside air are large, the fresh air flow associated with energy consumption for cooling in summer and heating in winter time.

In humid climate the fresh air load on the air condition is 3 times larger than the load introduces by the people inside and in most cases humidity load in humid climate is dominated by fresh air inflow.

By the same talking in winter time, exchange of fresh air increases the Heating Load . AFAC deals with method and means to exchange heat and vapor between the fresh air inflow and the exit air using hygroscopic brine as heat exchange fluid. We recognize two version of AFAC a,& b

a: Exchange of heat and vapor between inflow and exit air.

Here the exit air exchange heat with entered air and reduces the enthalpy gradient between the fresh inflow and the enclosure. The effect is illustrated in table 1 which was computed for Bombay climate conditions

The annual cooling of AFAC is 128000 kWh. The power consume by 1 unit is 1.7 kWh for blowers and pumps. The annual power saving is 49000 kWh .It amount to annual saving of 6387$ in India.

The performance AFAC without compressor is illustrated in the following table :In this version the unit use only 1.7 kW for pumps and blowers

b : AFAC with compressor

The structure of the AFAC is identical with that of Agam Combine Cycle Air Condition CCAC which is display in this page. Yet the brine circulation is different and make it possible to exchange heat and vapor between the fresh air inflow and the exit air amplify the compressor work and the efficiency of the AFAC.

Table 2 illustrate the performance of AFAC in the humid climate For different wet bulb temperature Tw, outside temperature is 31 C and inside temperature is 24 C and 50%.

Thus , the application of AFAC reduces the humidity load and allow comfortable Relative humidity even when the humidity load is exceedingly high.

Also the capacity of the AFAC increases to 12 ton when it is mostly needed.(Tw>27 oC). Keeping relative humidity at comfortable level of 50% in high humidity load require heating or dehumidification in addition to conventional air condition. This reduces the efficiency to C.O.P.<2. From the above table one may see that the annual saving of Agam Fresh Air conditioner in tropical climate exceeds 65000 kWh. This resulted with annual saving which is larger than its cost.