ERV with increasing cooling load

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Hi,
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I model a PSZ system with exhaust air heat recovery. I set the static pressures of supply/exhaust fans as zero in ERV tab. Therefore, the fan energy is the same with or without ERV. However, there is an increasing cooling load in?the cooling model. I changed the hourly report and?didn't find the reason.?Any suggestions are highly appreciated.
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Thanks
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Shaojie?

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