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Correct physics based VRF model to align inlet and outlet air flow rates #7295

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merged 12 commits into from
May 17, 2019
Merged

Correct physics based VRF model to align inlet and outlet air flow rates #7295

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3aa02d6
Adjust cryptic model to align inlet/outlet air flow rates
rraustad May 9, 2019
63442e6
Merge remote-tracking branch 'origin/develop' into 6301-VRF-Terminal-…
Myoldmopar May 13, 2019
03f4064
Add a few comments
rraustad May 13, 2019
ac463cb
Mimic new VRF model calculations
rraustad May 14, 2019
a674053
Merge branch 'develop' of https://github.com/NREL/EnergyPlus into 630…
rraustad May 14, 2019
1b8245c
Merge branch '6301-VRF-Terminal-unit-flow-balance-problems' of https:…
rraustad May 14, 2019
69211ef
Clean up and add unit test
rraustad May 15, 2019
ce7d093
A bit more clean up to fix formatting and delete unnecessary code
rraustad May 15, 2019
b2f4106
Delete unused variable
rraustad May 15, 2019
5bd6ae1
Remove more unused variables
rraustad May 16, 2019
2ec3bcf
Merge remote-tracking branch 'origin/develop' into 6301-VRF-Terminal-…
Myoldmopar May 17, 2019
9792e73
Fix unused variable issue
Myoldmopar May 17, 2019
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2 changes: 1 addition & 1 deletion ...src/simulation-models-encyclopedic-reference-002/variable-refrigerant-flow-heat-pumps.tex
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Expand Up @@ -895,7 +895,7 @@ \subsubsection{Overview}\label{VRF-FluidTCtrl-HP-overview}

Note that a number of calculation steps are coupled together in the VRF-FluidTCtrl model, for instance, the piping loss calculation and the system performance calculation. More specifically, the piping loss changes the operating conditions of the system, which may lead to a different control strategy and thus in reverse affect the amount of piping loss. This makes it difficult to obtain an analytical solution for a number of operational parameters (e.g., enthalpy of refrigerant entering the indoor unit), and therefore numerical iterations are employed to address this problem (refer to Figure VRF-FluidTCtrl-3 for more details). Therefore, the VRF-FluidTCtrl model can have a longer execution time to perform the simulation than the VRF-SysCurve model.

The object connections for VRF-FluidTCtrl model is similar to those for VRF-SysCurve model. The difference lies in the object used to describe a specific components. For example, VRF-SysCurve model uses \emph{AirConditioner:VariableRefrigerantFlow} object to describe the VRF outdoor unit performance, while in VRF-FluidTCtrl model the \emph{AirConditioner:VariableRefrigerantFlow} object is used.
The object connections for VRF-FluidTCtrl model is similar to those for VRF-SysCurve model. The difference lies in the object used to describe a specific components. For example, VRF-SysCurve model uses \emph{AirConditioner:VariableRefrigerantFlow} object to describe the VRF outdoor unit performance, while in VRF-FluidTCtrl model the \emph{AirConditioner:VariableRefrigerantFlow:FluidTemperatureControl} object is used.
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Good find.


\begin{figure}[hbtp] % figure VRF-FluidTCtrl-1b
\centering
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