[Equest-users] VFD vs constant pump

[Pramod .D via Equest-users]

Hi All,

I am simulating a model to see the savings provided by VFD pump connected to the DHW plant loop. The energy used by the VFD pump is less compared to constant volume pump. The problem is the energy usage of DHW increases if constant volume pump is changed to VFD. Is this correct or am I missing anything?  How does VFD pumps increases DHW usage?

Thanks!
Pramod
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