The factors listed in Table 2 as well as the ratios between the average annual consumption of CWHC in a Spanish hospital and the three abovementioned water consumption indicators (built surface area, number of workers, and number of beds in a hospital, resp.) are next analysed.
The results collected when considering location as a factor show significant differences in the average annual water consumption of CWHC in a hospital in relation to the number of beds (p = 0.01) and no statistical significance according to the built area of the hospital (p = 0.71) nor the number of workers (p = 0.36).
According to the results, the consumption of water according to the number of beds and workers and built area of the hospitals, one of the main explanations of such a significant reduction in CWHC between 2005 and 2007 is the impact of the sensitization and awareness campaigns about water savings.
This is an option, which would reduce the consumption of CWHC and consequently its environmental impact.
It can be concluded that there is a link between the cold water for human consumption (CWHC) in hospitals and the built surface area of the hospital (A) and the number of beds (NB).
Nomenclature A: Value of the built area in a hospital, [m.sup.2] HDDY: Heating degrees-day year, [degrees]C NB: Total number of beds in a hospital NW: Number of workers in a hospital [T.sub.max]: Maximum daily temperature, [degrees]C [T.sub.min]: Minimum daily temperature, [degrees]C WC: Average annual consumption of CWHC, [m.sup.3] [X.sub.c]: Logical coefficient.
Caption: FIGURE 1: Annual average consumption of CWHC and DHW in healthcare centres per hospital bed.
Caption: FIGURE 2: Relation between the average annual consumption of CWHC and the built surface area in a hospital.
Caption: FIGURE 3: Relation between the average annual consumption of CWHC and the number of workers in a hospital.