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Copy file name to clipboardExpand all lines: doc/engineering-reference/src/alternative-modeling-processes/hybrid-model.tex
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@@ -59,7 +59,7 @@ \subsubsection{Zone air heat balance algorithm}\label{Zone-air-heat-balance-algo
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The sum of zone loads and the provided air system energy equals the change in energy stored in the zone. Typically the zone capacitance, $C_z$ includes the zone air only when formulating energy balances for the zone air. The internal thermal mass, including furniture, books, and changeable partitions, is assumed to be in thermal equilibrium with the zone air, thus it is added in the zone heat capacitance, $C_z$. The infiltration airflow rate, $\dot{m}_{inf}$ changes for different conditions depending on outdoor temperature, wind speed, and HVAC system operations. The energy provided from systems to the zone is represented as $Q_{sys}$.
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T_{o} &: \text{Outdoor air temperature at the current time step} ~[K],\\
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T_{sys} &: \text{System supply air temperature at the current time step} ~[K],\\
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t &: \text{Current time},\\
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\Sigma{Q_{in}} &: \text{Sum of internal sensible heat gain} ~ ,\\
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\Sigma{Q_{int}} &: \text{Sum of internal sensible heat gain} ~ ,\\
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\Sigma{h_i A_i (T_{si}-T_z)} &: \text{Convective heat transfer from the zone surfaces} ~ [kW],\\
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\Sigma{\dot{m}_{zi}C_p(T_{zi}-T_z)} &: \text{Heat transfer due to interzone air mixing} ~ [kW],\\
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\dot{m}_{inf} (T_o - T_z)&: \text{Heat transfer due to infiltration of outside air} ~ [kW],\\
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\subsubsection{Interior mass objects in EnergyPlus modeling}\label{interior-mass-objects-in-EnergyPlus-modeling}
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The EnergyPlus object, ``InternalMass'', is used to specify the construction materials and area of interior mass within the space, which are important to heat transfer calculations. Internal mass objects participate in the zone air heat balance and the longwave radiant exchange. The geometry of the internal mass construction is greatly simplified due to the difficulty of measurement. They do not directly interact with the solar heat gain because internal mass objects do not have a specific location in space. Internal mass objects can represent multiple pieces of interior mass (furniture, partitions) with different constructions. Internal mass exchanges energy through its both surfaces with the zone by convection.
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The EnergyPlus object, ``InternalMass'', is used to specify the construction materials and area of interior mass within the space, which are important to heat transfer calculations. Internal mass objects participate in the zone air heat balance and the longwave radiant exchange. The geometry of the internal mass construction is greatly simplified due to the difficulty of measurement. They do not directly interact with the solar heat gain because internal mass objects do not have a specific location in space. Internal mass objects can represent multiple pieces of interior mass (furniture, partitions) with different constructions. Internal mass exchanges energy through both its surfaces with the zone by convection.
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\end{aligned}
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\end{equation}
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The hybrid modeling approach derives the internal mass by solving the heat capacity of zone air and internal thermal mass, $C_z$. The equation below shows the inverse heat balance algorithm that replacing the zone air temperature, $T_z$ with the measured zone air temperature. The current timestep measured temperature, $T_z^t$ and the previous timestep measured temperature, $T_z^{t-\delta t}$ are given from inputs, them the zone air heat capacity, $C_z^t$ for each timestep is expressed as following.
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The hybrid modeling approach derives the internal mass by solving the heat capacity of zone air and internal thermal mass, $C_z$. The equation below shows the inverse heat balance algorithm that replacing the zone air temperature, $T_z$ with the measured zone air temperature. The current timestep measured temperature, $T_z^t$ and the previous timestep measured temperature, $T_z^{t-\delta t}$ are given from inputs, then the zone air heat capacity, $C_z^t$ for each timestep is expressed as following.
Copy file name to clipboardExpand all lines: doc/engineering-reference/src/integrated-solution-manager/zone-air-mass-flow-conservation.tex
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\section{Zone Air Mass Flow Conservation}\label{zone-air-mass-flow-conservation}
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\subsection{Overiew}\label{overiew}
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\subsection{Overview}\label{overiew}
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The zone air mass flow conservation object, ZoneAirMassFlowConservation, activates zone air mass flow balance calculations. This feature is available only for controlled zones (ZoneVAC:EquipmentConnections) which also have either a zone mixing or infiltration object. The user may specify that zone mixing, infiltration, or both can be overridden to balance the zone air mass flows. The following rules apply:
Copy file name to clipboardExpand all lines: doc/engineering-reference/src/loop-equipment-sizing-and-other-design-data/system-design-loads-and-air-flow-rates.tex
We now have the calculated system sizing data. This data needs to be altered to take into account the user input system design flow rates (if any), or the fact that the user may have requested that the system flow rate be sized on the ventilation requirement. Note that user specified sizing ratios have already been applied to the zone sizing data which have been used in out preceding system sizing calculation. Thus the user specified sizing ratios do not have to be explicitly taken into account at the system level.
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We now have the calculated system sizing data. This data needs to be altered to take into account the user input system design flow rates (if any), or the fact that the user may have requested that the system flow rate be sized on the ventilation requirement. Note that user specified sizing ratios have already been applied to the zone sizing data which have been used in our preceding system sizing calculation. Thus the user specified sizing ratios do not have to be explicitly taken into account at the system level.
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\end{enumerate}
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First we move the calculated system sizing data from \emph{CalcSysSizing} array into the \emph{FinalSysSizing} array. \emph{FinalSysSizing} will contain the user modified system design data when we are all done.
The object name becomes the global EMS trend variable name that can be referenced in the \emph{EnergyPlus Runtime Language}. No spaces or any other special characters are allowed in the name. Then name must be unique across all global scope variables including those declared as sensor and actuators and the built-in variables.
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The object name becomes the global EMS trend variable name that can be referenced in the \emph{EnergyPlus Runtime Language}. No spaces or any other special characters are allowed in the name. The name must be unique across all global scope variables including those declared as sensor and actuators and the built-in variables.
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