India’s energy demands are expected to be more
than double by 2030, and there is a pressing need to develop ways to conserve
energy for future generations. Thus energy consumption can be reduced
drastically by using energy efficient appliances. In India, the Union ministry
of power's research pointed out that about 20-25% of the total electricity
utilized in government buildings in India is wasted due to unproductive design,
resulting in an annual energy related financial loss of about Rs 1.5 billion.
Conventional heating ventilation and air conditioning systems (HVAC) consume
approximately 50% of the building energy. This type of air conditioning is
therefore neither eco- friendly nor sustainable. Selection of appropriate air conditioning
system for buildings can not only help the country save electrical energy but
also reduce greenhouse emissions.
A number of authors have worked with two stage
evaporative cooling system utilizing the advantages of both these methods and
achieved temperature reduction to a few degrees below the wet bulb temperature
of incoming air etc., But these methods are not at all sufficient to provide
air conditioning in buildings especially during summer seasons in India where
the ambient air temperature shoots above 450C in many parts of the
country.