The resulting optimum simulation has yielded the following power ratings:
x Heating design capacity: 21.13 kW with set point temperature of 20 °C
x Cooling design capacity: 20.49 kW with set point temperature of 25 °C.
The set temperatures of 20 °C for winter and 25 °C for summer are actual temperatures that the operator desires
in his hotel. They are different from the standard temperatures used in energy performance certification for buildings
in Malta, which are set at 18.2 °C and 26.5 °C, respectively.
It is interesting to note that the heating capacity for winter is higher than that for summer, even though the
energy demand for heating is much lower (see Fig. 5). This is because the extreme weather during winter – even for
a short time - may dictate a higher power rating for that worst case scenario, while in summer the weather does not
really have major stress periods, as it remains quite hot throughout the season with no major extremes.
The main delivered (end-use) energy consuming sectors of the hotel are shown in Figure 5. Following the
implementation of energy efficiency measures in the building’s envelope, lighting seemed to be the most important
consumption of energy. This is followed closely by water heating and then space cooling. Hence, it is clear that
these three areas should be given more attention with respect to application of energy efficient systems.