A steam condenser has separate air and condensate pumps. The entry to air pump suction is screened. Steam enters the condenser at \(38^{\circ} \mathrm{C}\) and the condensate is removed at \(37^{\circ} \mathrm{C}\). The air removed has a temperature of \(36^{\circ} \mathrm{C}\). If the quantity of air infiltration from various sources is \(5 \mathrm{~kg} / \mathrm{h}\), determine the volume of air handled by the air pump per hour. Compare this with the quantity that would have to be dealt with by using a combined air and condensate pump. Neglect the pressure due to air at the entry of steam and assume uniform pressure in the condenser.