(a) With the help of a schematic diagram, describe the Linde liquefaction process.

(b) With the help of a \(T-S\) diagram, describe the vapour compression refrigeration cycle. Derive the expression for COP.

(c) Calculate the efficiency of an absorption refrigeration cycle if the temperature of the space to be refrigerated is \(-10^{\circ} \mathrm{C}\), the temperature of the heat source is \(100^{\circ} \mathrm{C}\) and the ambient temperature is \(30^{\circ} \mathrm{C}\).