Hi all,
I'm not sure I understand how eQuest calculates the heating/cooling
equipment loads.
I've built two models with identical envelopes and internal loads etc,
and OA supply. In model A, we have a boiler and chiller on hot and
chilled water loops and a four-pipe fan coil air-side system. In model
B, we're using an air cooled Heat Pump and two-pipe fan coils.
In report PS-C for model A, the sum heat load is -29.6 MBTU, whereas for
model B, the sum heat load is -130.2 MBTU. I understand that the fuel
use should be very different, but I don't know why the load is so
different between the models. Shouldn't the heating energy delivered to
the spaces be the same in both cases? Why does the Heat Pump system
have a load that is so much higher than its counterpart?
Similarly, in report SS-E, January has 110 Heating load hours for Model
A, and 385 Heating load hours for Model B. Again, shouldn't the loads
be the same between the two models?
Thanks in advance for the help,
Katherine
Thanks Brian,
But I'd already examined LS-C, LS-D, SS-C and SS-D. As one would
expect, LS-C and LS-D are the same for both models. SS-D, however, is
not. I guess what I don't understand is what eQuest considers a "load"
to be. I consider "load" to be the requirements of the space (including
envelope, occupants, and OA), and none of those things have changed
between my models. The only thing that changes is what system is used
to meet the load.
SS-D only has a monthly breakdown - but doesn't explain why the loads
are different.
Thanks,
Katherine