Hello eQuesters,

Currently i am working on a project which has 2
VSD enabled centrifugal chillers. When i ran the simulation with one chiller
and checked the PS-D report, the Peak Load is 480 TR. Same is the case with
two chillers. But there is difference in Annual Energy consumption. For
instance Annual energy consumption with one chiller is 1050k kWh whereas
with two chillers it is 680k kWh. PS-H report shows cooling Capacity is 4.2
MBTU with two chillers and 8.314 MBTU with single chiller. My doubt is why
there is discrepancy in Annual Energy Consumption even if i am equally
sizing both the chiller with with 4.2 MBTU.

Thanks in advance,

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*Javed Iqbal, LEED AP, CEA*
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