Conventional MVR Systems uses Metal Heat Exchangers and complex Compressors. The system is designed for the use of minimum surface area consider the cost of metal surfaces used for the particular applications. In most cases the metals used to be expensive Stainless Steel, Titanium and exhaustic materials.

As we have already seen in our previous pages, any Evaporation system is based on the equation below :

Φ= k x A x ∆ T
Pc = C x Φ x ∆ T

Where:

Φ = Evaporating capacity ,
K = Heat transfer coefficient
A = Evaporative surface area,
T =Temperature difference,
Pc = Fan power consumption ,
C = Fan coefficient.

The descriptive analogy of the equation - More the heat exchange surface area, less the delta T required and hence lesser the power consumption of the compressor (Energy required for evaporator).

But unfortunately because of high cost of metal, minimum surface is used and hence more power is required for evaporation and then combined with normal problems of Corrosion, Scaling and minimum life.

Also due to minimum surface area high ∆T is required and complex compressors with high investment and maintenance is required.