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Without knowing the E+ version that you are using, it seems like some FluidtoFluid heat exchanger fields are missing or out of order. The error shows this clearly by saying "You cant put a string as an input for Design flow rate" because it is looking for either a number or autosize but your fourth input for the object is a name.

This is how a full FluidtoFluid heat exchanger would be inputted: https://bigladdersoftware.com/epx/docs/9-3/input-output-reference/group-condenser-equipment.html#field-operation-maximum-temperature-limit

Without knowing the E+ version that you are using, it seems like some FluidtoFluid heat exchanger fields are missing or out of order. The error shows this clearly by saying "You cant put a string as an input for Design flow rate" because it is looking for either a number or autosize but your fourth fifth input for the object is a name.

This is how a full FluidtoFluid heat exchanger would be inputted: https://bigladdersoftware.com/epx/docs/9-3/input-output-reference/group-condenser-equipment.html#field-operation-maximum-temperature-limit