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[EnergyPlus_Support] Problems on Cooling load demand in condenser loop

Dear all,
I have modelled a building with two different condensing water 
plants. The first one uses cooling tower only connected to electric 
chillers. The second one uses cooling tower serves the electric 
chillers plus a ground source heat pump at demand side.

Generally when i check the cooling demand, the sum of source side 
heat transfer rate of heat pump and the cooling demand of the 
condensing water loop of the second arragement is nearly the same as 
the total cooling demand from the first one in condensing water loop.

However, when i sum up all heat transfer of the cooling tower in the 
plant that with heat pump, it is found that the total heat transfer 
in cooling tower < cooling load demand for the condenser plant loop. 
Which it does not happen in the first one (condensing plant without 
heat pump)(total heat transfer in cooling tower nearly the same as 
the cooling load demand for the condenser plant loop). Also when i 
check the outlet temperature for both plants, it is found that both 
of them are at my setpoint temperature.

I want to ask do these results correct or any protential problem 
with such arrangement?

Ernest Tsang

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