Experiments can be conducted which study how adjustment of one or both of these parameters affects the amount of heat removed from the water provided to the water heater. The remainder of this report will explain the theory behind the operation of a cooling tower and how the laboratory cooling tower is operated. An example of a mass and energy balance on the laboratory cooling tower will be presented along with the results of experiments in which the rate of heat dissipated by the tower was calculated at full capacity and when the pump speed and fan speed were varied independently.