Fig.39.1 Typical Radiative cooling system.

Fig.39.2 Typical insulation cooling system.

The ‘convective cooling’ can be further divided into ‘direct convective cooling’ and ‘indirect convective cooling’. In both the techniques, the heat absorbed by the coolant is used to raise its sensible heat or to change coolants phase. Typical convective cooling technique is shown schematically in the Fig. 39.3. In the direct convective cooling, the coolant is passed directly through the surface which needs to be cooled, while in the indirect convective cooling, one or many heat transfer loops are incorporated.