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RE: [EnergyPlus_Support] DOE Reference Building, Elementary School, Chicago problem with NoEconomizer uni




·         Minimum outdoor air flow will not reduce to prevent freezing.  You must define the minimum flow using the Controller: OutdoorAir or other outdoor air object (e.g., DesignSpecification:OutdoorAir)

·         If there is no economizer, the only means of cooling will be the DX coil. 

·         If you have allowed the coil to be available in the cold weather and there is a cooling demand (in a core area, for example), the DX coil will ?operate?

·         E+ provides a warning to alert you, not to say that it is impossible or wrong, since certain DX systems are designed to operate during very cold weather. 

·         In your case, it looks unusual for the coil outlet temperature to be -4C.  Perhaps there is a fairly large minimum outdoor air flow which causes the mixed air / coil entering  temperature to be very low?


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