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Here is a solution my friend. After autosizing components in the plant loop that you intend to use your virtual load, replace autosized fields with the result of the energyplus autosizing. Then the load and flow request from the loadprofile:plant would not affect component sizing. The second problem I think is handled by the load distribution of the energyplus. You just have to set a binary value for load and maximum flow rate (pump size) for flow. Then using ems you can turn off the pumps when the chiller PLR is zero.

Here is a solution my friend. After autosizing components in the plant loop that you intend to use your virtual load, replace autosized fields with the result of the energyplus autosizing. Then the load and flow request from the loadprofile:plant would not affect component sizing. The second problem I think is handled by the load distribution of the energyplus. You just have to set a binary value for load and maximum flow rate (pump size) for flow. the flow of theloadprofile:plant. Then using ems you can turn off the pumps when the chiller PLR is zero.