Q1: Heat load in a cooling tower

ANS:C - both (a) & (b).

1. User means the amount of heat thrown away (KCal/hr.) by the cooling tower:
   • This statement is essentially saying that the "user" of the cooling tower refers to the heat load, which is the amount of heat that the cooling tower is designed to remove from a process or system. The heat load represents the thermal energy that needs to be dissipated to maintain the desired temperature in the system. Cooling towers are commonly used in industrial processes, HVAC systems, power plants, and other applications to remove excess heat and maintain optimal operating conditions.
2. User is equal to the number of kg of water circulated times the cooling range:
   • This statement relates the heat load (user) of the cooling tower to the mass flow rate of water circulated through the tower and the temperature difference between the inlet and outlet water, known as the cooling range. The cooling range represents the difference in temperature between the hot water entering the cooling tower and the cooled water leaving the tower. The greater the mass flow rate of water and the larger the cooling range, the higher the heat load on the cooling tower because more heat needs to be removed to achieve the desired cooling effect.