What is the difference between a chiller and a cooling tower?

Chemical formula is H2O, no difference except temperature.

A conventional 300 KW chiller requires a 375 m3/h cooling tower.

Chillers generally have requirements for flow rate, flow rate and temperature difference, and can be selected according to design requirements. However, if the relevant parameters are not known, the cooling tower flow rate may be selected at a rate of 1.25 cubic meters per hour per kilowatt.

The conventional design cooling tower demand flow is calculated as follows: q = 3.6 × Q × K / (C × Δt) where Q is the total heat capacity, k is the absorption coefficient 3, C is the specific heat capacity of the water 4.19, Δt is the chiller Temperature difference, optional 6.

http://www.vrcoolertech.com/evaporator-coil/dx-evaporator-coil.html