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Copy file name to clipboardExpand all lines: Manuals/FDS_User_Guide/FDS_User_Guide.tex
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@@ -3696,7 +3696,7 @@ \section{HVAC Systems}
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\end{lstlisting}
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where:
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\begin{itemize}
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\item \ct{TYPE_ID} is a character string that indicates the type of component that the namelist group is defining. \ct{TYPE_ID} can be \ct{DUCT}, \ct{NODE}, \ct{FAN}, \ct{FILTER}, \ct{AIRCOIL}, or \ct{LEAK} (see ~Sec.~\ref{info:local_leakage}).
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\item \ct{TYPE_ID} is a character string that indicates the type of component that the namelist group is defining. \ct{TYPE_ID} can be \ct{DUCT}, \ct{NODE}, \ct{FAN}, \ct{FILTER}, \ct{AIRCOIL}, or \ct{LEAK} (see ~Sec.~\ref{info:local_leakage}).
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\item \ct{ID} is a character string giving a name to the component. The name must be unique amongst all other components of that type; however, the same name can be given to components of different types (i.e., a duct and a node can have the same name but two ducts cannot).
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\end{itemize}
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A number of examples of simple HVAC systems are given in the HVAC folder of the sample cases and are discussed in the FDS Verification Guide.
\item \ct{AMBIENT} is a logical value. If \ct{T}, then the node is connected to the ambient (i.e., it is equivalent to the \ct{OPEN} boundary condition on a \ct{SURF} line).
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\item \ct{DUCT_ID} gives the \ct{ID}s of the ducts connected to the node. Only one duct is allowed if the node is \ct{AMBIENT} or has a \ct{VENT_ID}. Up to 10 ducts can be connected to a node.
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\item \ct{FILTER_ID} gives the \ct{ID} a filter located at the node. A node with a filter must have two connected ducts. This means a filter cannot be located at an ambient node, a node that is attached to a \ct{VENT}, or node with three or more ducts.
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\item \ct{GEOM} Indicates the node is attached to an unstructured geometry object (Section~\ref{info:hvac_geom}).
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\item \ct{LOSS} is an $n$ by $n$ array of real numbers giving the dimensionless loss coefficients for the node. \ct{LOSS(I,J)} is the loss coefficient for flow from duct \ct{I} to duct \ct{J} expressed in terms of the downstream duct area (see discussion in ~\ref{info:HVACduct} on how to adjust losses for area changes). For a terminal node (e.g., a node connected to the ambient or to a \ct{VENT}) the \ct{LOSS} is entered as a pair of numbers representing loss coefficient for flow entering the HVAC system and for flow exiting the HVAC system.
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\item \ct{NETWORK_ID} Used for Smokeview visualization. All ducts and nodes with a common \ct{NETWORK_ID} can be selected or deselected as a group in Smokeview. If no value is given, the node will be placed in the Unassigned network.
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\item \ct{VENT_ID} is the name of the \ct{VENT} where the node connects to the FDS computational domain. No two \ct{VENTs} should be defined with the same \ct{VENT_ID}.
Note that a \ct{VENT} being used for an HVAC system must be present throughout the simulation. The \ct{VENT} should not have a \ct{CTRL_ID} or \ct{DEVC_ID}. This also includes the solid surface it is attached; i.e., any \ct{OBST} the \ct{VENT} is attached to also needs to be present throughout the simulation. Turning on or off a \ct{VENT} connected to an HVAC system, requires a damper in the duct connected to \ct{VENT}.
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The pressure zone and physical presence restrictions also apply to \ct{GEOM} being used for an HVAC system.
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\subsection{HVAC Fan Parameters}
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\label{info:HVACfan}
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@@ -14003,6 +14006,7 @@ \chapter{Error Codes}
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174 \> \ct{REAC, Not enough nitrogen for the FUEL_N_TO_HCN_FRACTION.} \> Section~\ref{info:simple_chemistry} \\
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175 \> \ct{REAC, Not enough carbon for the FUEL_C_TO_CO_FRACTION ...} \> Section~\ref{info:simple_chemistry} \\
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176 \> \ct{REAC, Not enough hydrogen for the FUEL_H_TO_H2_FRACTION ...} \> Section~\ref{info:simple_chemistry} \\
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179 \> \ct{BACK tracked species ... not found.} \> Section~\ref{info:BACKGROUND_SPECIES} \\
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180 \> \ct{SPEC ... does not have a SPECIFIC_HEAT_LIQUID ...} \> Section~\ref{info:liquid_props} \\
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181 \> \ct{SPEC ... does not have a MELTING_TEMPERATURE.} \> Section~\ref{info:liquid_props} \\
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182 \> \ct{SPEC ... does not have a VAPORIZATION_TEMPERATURE.} \> Section~\ref{info:liquid_props} \\
@@ -14161,6 +14165,7 @@ \chapter{Error Codes}
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376 \> \ct{Meshes must have the same y/z bounds for TUNNEL_PRECONDITIONER.} \> Section~\ref{tunnel_solver} \\
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