Compact heat exchanger can be characterized by its high ‘area density’ this means that is has a high ratio of heat transfer surface to heat exchanger volume. So Compact heat exchange is characterized by high heat transfer surface-area to volume ratios and high heat transfer coefficients compared to other exchanger types. A heat exchanger having a surface area density greater than about 700 m2/m3 for a gas is quite arbitrarily referred to as a compact heat exchanger. The heat transfer surface area is increased by fins to increase the surface area per unit volume and there are many variations available
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very effective in significantly dampening the mechanical noises.