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RE: [EnergyPlus_Support] DOE Reference Building, Elementary School, Chicago problem with NoEconomizer uni
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- Subject: RE: [EnergyPlus_Support] DOE Reference Building, Elementary School, Chicago problem with NoEconomizer uni
- From: "Jim Dirkes" <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 16 May 2012 14:01:57 -0400
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· 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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