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— A formed length of material inserted inside evaporator tubing and aiming at increasing flow turbulence and heat exchange.

— Vaporization of a liquid with formation of bubbles.

— A narrow split bearing fitting on to the disc of an eccentric which is used as a crank.

— Eddy diffusion Convective diffusivity moving fluid.

— The capacity of room after the loss of space due to coils, columns, air ducts, dunnage, and any other space which may be required to give good air circulation, has been deducted.

— Ratio between the work absorbed in conveying and compressing a unit mass of refrigerant in a perfect compressor and the work absorbed, per unit mass of refrigerant, by the shaft of an actual compressor.

— That time required to cool a product from a given initial temperature, to freeze it and to lower its temperature at the thermal centre to a given value.

— A comfort index (originated in the U.S.A.) combining the effect of temperature, humidity and movement of air.

— The work input absorbed at the shaft of a compressor, irrespective of time.

— The ratio of the energy output to the energy input of a process or a machine.