Interzone Exterior Convection[LINK]
Why is my exterior convection coefficient value 0?
When two surfaces are linked as interzone surfaces, the “exterior” side of these surfaces does not really exist. EnergyPlus links the two surfaces by using the inside temperature of surface A as the outside temperature of surface B, and the reverse. For example:
Zone1WestWall has an outside boundary of Surface = Zone2EastWall
Zone2EastWall has an outside boundary of Surface = Zone1WestWall
Let’s say that at hour 2, the inside surface temperature of Zone1WestWall is 19C, and the inside temperature of Zone2EastWall is 22C. When the heat balance is calculated for Zone1WestWall, its outside surface temperature will be set to 22C. Likewise, when the heat balance is calculated for Zone2EastWall, its outside surface temperature will be set to 19C. So, for interzone surfaces, h ext does not apply. That is why it is reported as zero.
Interzone Exterior Convection[LINK]
Why is my exterior convection coefficient value 0?
When two surfaces are linked as interzone surfaces, the “exterior” side of these surfaces does not really exist. EnergyPlus links the two surfaces by using the inside temperature of surface A as the outside temperature of surface B, and the reverse. For example:
Zone1WestWall has an outside boundary of Surface = Zone2EastWall
Zone2EastWall has an outside boundary of Surface = Zone1WestWall
Let’s say that at hour 2, the inside surface temperature of Zone1WestWall is 19C, and the inside temperature of Zone2EastWall is 22C. When the heat balance is calculated for Zone1WestWall, its outside surface temperature will be set to 22C. Likewise, when the heat balance is calculated for Zone2EastWall, its outside surface temperature will be set to 19C. So, for interzone surfaces, h ext does not apply. That is why it is reported as zero.
Documentation content copyright © 1996-2016 The Board of Trustees of the University of Illinois and the Regents of the University of California through the Ernest Orlando Lawrence Berkeley National Laboratory. All rights reserved. EnergyPlus is a trademark of the US Department of Energy.
This documentation is made available under the EnergyPlus Open Source License v1.0.