Hi folks,

Here is a question.

simple steps by ourselves, we can know the yearly building heating load is 6
kwh/ft2

Meanwhile, From SS-D (building HVAC system load summary), we can know the
yearly HVAC heating load is 25 kwh/ft2

There is a 19 kwh/ft2 difference between each other.

Could I ask what the reason is? (Note: I know this is the HVAC system
efficiency, but could I know more detailed quantitive reasons? ) For
example. the duct heat loss, the returning air heat loss. (Can we get these
data from eQUEST output?, like the heat loss from the wall, window, roof,
ground...)

Do you guys know any paper or documents about this question?

Thank you very much.

Sincerely yours,
Yang