Tower size varies directly and linearly with heat load. See Figure 4.
2) Tower size varies inversely with range. See Figure 5. Two primary factors account for this. First; increasing the range—Figure 3—also increases the ITD (driving force) between the incoming hot water temperature and the entering wet-bulb temperature. Second, increasing the range (at a constant heat load) requires that the water flow rate be decreased—Formula (2)—which reduces the static pressure opposing the flow of air