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[EnergyPlus_Support] Heating/Cooling Changes Drastically with Occupancy

Dear all,

I have modeled a very simple one zone building in Eplus Version 7.1:

a) 1225 sq ft.
b) 15% glazing window/wall ratio.
c) No infiltration, No ventilation, No Lights, No Equipment.
d) Heatbalance algorithm - Conduction Finite Difference with 60 timesteps per hour.
e) HVAC - Ideal Air Loads System - always ON. (Heating Setpoint: 21 Degree Centigrade and Cooling Setpoint: 25 Degree Centigrade)
f) Heating and Cooling Availability always ON.

Okay now here is the problem:

When the number of people progressively increases in the building the annual heating and cooling energy changes drastically (more than expected) :

Zero People: 
Annual Heating: 1.4969E+10 Joules
Annual Cooling: 4.064E+9  Joules

1 Person (Activity Schedule is always on and the activity level is 120 Watts per person):

Annual Heating: 1.3882E+10 Joules
Annual Cooling: 5.303E+9 Joules

2 People (Activity Schedule is always on and the activity level is 120 Watts per person):

Annual Heating: 1.2853E+10 Joules
Annual Cooling: 6.509E+9 Joules

Could anyone help me pinpoint what is going on here. I would appreciate any insight on this issue. Thanking you.

Sincerely yours'

Niraj Poudel, Architectural Engineer.
PhD student, PDBE Program.
Clemson University, Clemson, SC.


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