Retrotec USACE - Manual (Page 445)

Appendix N N15
Comparison with demand calculations ■
All of these approximations are still under investigation and need further
research for making them general applicable. The following fi gure gives some
actual application samples for model based monitoring. We easily can see
The monthly presentation of the data indicates a saving potential of ■
about 38% if the demand calculations are realistic.
The daily presentation indicate
■
The model needs to be improved for outdoor temperatures around 15° ◆
The model needs to be improved to refl ect occupancy more correctly ◆
The control of the heating system needs to be improved to better ◆
refl ect weekend and holiday situations
The hourly presentations indicate ■
The heating system does not take into account night set back suffi ciently ◆
The model has still some problems for the calculation in October ◆
The model does not take into account internal loads during Decem- ◆
ber correctly
Taking into account all of these defi ciencies we expect an overall saving po-
tential of about 10% to 15% based primarily on the missing night and holiday
setbacks.
Also further efforts are necessary to predict hourly behavior more reliable.