A cooling tower uses forced air and column packing to cool downward-flowing water. Inlet water temperature and water flow rate are varied to investigate effects on outlet water temperature, outlet air temperature, and outlet air humidity. The system is first observed operating with ambient room temperature water. A heat load is then applied to the water tank, and the system response is observed. This is to simulate a power plant starting up and placing a cooling load on the cooling water supply. The aim is to compare the system response with and without the load. Data from the Experiment and the make-up water mass flow rate are both shown in the following tables below.

Procedure:

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(2) Apply a cooling load. Student may select the magnitude of load: Q = 0.5kW, Q = 1kW. (3) Once steady state is achieved, students manually record system parameters, final data point. The make-up water mass flow rate is shown in the following table: Tower 1 Tower 2 No heat 3x10-4 kg/s 3.78x10-4 kg/s 0.5 kW 3.2x10-4 kg/s 1 kW 3.69x10-4 kg/s (2) Apply a cooling load. Student may select the magnitude of load: Q = 0.5kW, Q = 1kW. (3) Once steady state is achieved, students manually record system parameters, final data point. The make-up water mass flow rate is shown in the following table: Tower 1 Tower 2 No heat 3x10-4 kg/s 3.78x10-4 kg/s 0.5 kW 3.2x10-4 kg/s 1 kW 3.69x10-4 kg/s