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Why the cooling electricity usage increase a lot after install pump VFD

There is very interesting output of cooling electricity usage after changing from constant volume to variable volume for chilled water pump by using OpenStudio modeling. The output showed that the cooling electricity peak demand increased a lot on May compared with the baseline model. At the same time, the heating peak demand also increased a lot on the same month. Does anyone know why it happens like that?

Why the cooling electricity usage increase a lot after install pump VFD

There is very interesting output of cooling electricity usage after changing from constant volume to variable volume for chilled water pump by using OpenStudio modeling. The output showed that the cooling electricity peak demand increased a lot on May compared with the baseline model. At the same time, the heating peak demand also increased a lot on the same month. Does anyone know why it happens like that?