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47 :
48 : #ifndef HVACUnitaryBypassVAV_hh_INCLUDED
49 : #define HVACUnitaryBypassVAV_hh_INCLUDED
50 :
51 : // ObjexxFCL Headers
52 : #include <ObjexxFCL/Array1D.hh>
53 :
54 : // EnergyPlus Headers
55 : #include <EnergyPlus/Data/BaseData.hh>
56 : #include <EnergyPlus/DataGlobals.hh>
57 : #include <EnergyPlus/DataHVACGlobals.hh>
58 : #include <EnergyPlus/EnergyPlus.hh>
59 :
60 : namespace EnergyPlus {
61 :
62 : // Forward declarations
63 : struct EnergyPlusData;
64 :
65 : namespace HVACUnitaryBypassVAV {
66 :
67 : // Using/Aliasing
68 :
69 : // Data
70 : // MODULE PARAMETER DEFINITIONS
71 :
72 : // Mode of operation
73 : // can't change these to enum class since these are used in SetupOutputVariable()
74 : int constexpr CoolingMode(1); // System operating mode is cooling
75 : int constexpr HeatingMode(2); // System operating mode is heating
76 :
77 : enum class DehumidControl // Dehumidification control modes (DehumidControlMode) for Multimode units only
78 : {
79 : // TODO: enum check
80 : Invalid = -1,
81 : None,
82 : Multimode,
83 : CoolReheat,
84 : Num
85 : };
86 :
87 : enum class PriorityCtrlMode // Priority control mode (prioritized thermostat signal)
88 : {
89 : Invalid = -1,
90 : CoolingPriority, // Controls CBVAV system based on cooling priority
91 : HeatingPriority, // Controls CBVAV system based on heating priority
92 : ZonePriority, // Controls CBVAV system based on number of zones priority
93 : LoadPriority, // Controls CBVAV system based on total load priority
94 : Num
95 : };
96 :
97 : enum class AirFlowCtrlMode // Airflow control for contant fan mode
98 : {
99 : Invalid = -1,
100 : UseCompressorOnFlow, // Set compressor OFF air flow rate equal to compressor ON air flow rate
101 : UseCompressorOffFlow, // Set compressor OFF air flow rate equal to user defined value
102 : Num
103 : };
104 :
105 : // SUBROUTINE SPECIFICATIONS FOR MODULE
106 :
107 : struct CBVAVData
108 : {
109 : std::string Name; // Name of unit
110 : std::string UnitType; // Type of unit
111 : std::string availSchedName; // Availability schedule name
112 : Sched::Schedule *availSched = nullptr; // availability schedule
113 : Real64 MaxCoolAirVolFlow = 0.0; // System air volumetric flow rate during cooling operation [m3/s]
114 : Real64 MaxHeatAirVolFlow = 0.0; // System air volumetric flow rate during heating operation [m3/s]
115 : Real64 MaxNoCoolHeatAirVolFlow = 0.0; // System air volumetric flow rate when no cooling or heating [m3/s]
116 : Real64 MaxCoolAirMassFlow = 0.0; // System air mass flow rate during cooling operation [kg/s]
117 : Real64 MaxHeatAirMassFlow = 0.0; // System air mass flow rate during heating operation [kg/s]
118 : Real64 MaxNoCoolHeatAirMassFlow = 0.0; // System air mass flow rate when no cooling or heating [kg/s]
119 : Real64 CoolOutAirVolFlow = 0.0; // OA volumetric flow rate during cooling operation [m3/s]
120 : Real64 HeatOutAirVolFlow = 0.0; // OA volumetric flow rate during heating operation [m3/s]
121 : Real64 NoCoolHeatOutAirVolFlow = 0.0; // OA volumetric flow rate when no cooling or heating [m3/s]
122 : Real64 CoolOutAirMassFlow = 0.0; // OA mass flow rate during cooling operation [kg/s]
123 : Real64 HeatOutAirMassFlow = 0.0; // OA mass flow rate during heating operation [kg/s]
124 : Real64 NoCoolHeatOutAirMassFlow = 0.0; // OA mass flow rate when no cooling or heating [kg/s]
125 : Sched::Schedule *outAirSched = nullptr; // outside air multiplier schedule
126 : int AirInNode = 0; // Inlet air node number for CBVAV unit
127 : int AirOutNode = 0; // Outlet air node number for CBVAV unit
128 : int CondenserNodeNum = 0; // DX Coil condenser air inlet node number
129 : int MixerOutsideAirNode = 0; // Outside air node number for OA mixer
130 : int MixerMixedAirNode = 0; // Mixed air node number for OA mixer
131 : int MixerReliefAirNode = 0; // Relief air node number for OA mixer
132 : int MixerInletAirNode = 0; // Return air node number for OA mixer
133 : int SplitterOutletAirNode = 0; // Air node number for splitter (last component outlet node)
134 : int PlenumMixerInletAirNode = 0; // only used when bypass is connected to plenum or mixer
135 : std::string OAMixType; // type of outside air mixer
136 : std::string OAMixName; // Name of OA mixer
137 : int OAMixIndex = 0; // Index to OA mixer
138 : std::string FanName; // Name of fan
139 : HVAC::FanType fanType = HVAC::FanType::Invalid;
140 : HVAC::FanPlace fanPlace = HVAC::FanPlace::Invalid; // Fan placement is either blowthru (1) or drawthru (2)
141 : int FanIndex = 0; // Index number to fan
142 : Sched::Schedule *fanOpModeSched = nullptr; // Fan operating mode schedule
143 : Real64 FanVolFlow = 0.0; // Volumetric flow rate of system supply air fan [m3/s]
144 : Real64 HeatingSpeedRatio = 1.0; // Fan speed ratio in heating mode
145 : Real64 CoolingSpeedRatio = 1.0; // Fan speed ratio in cooling mode
146 : Real64 NoHeatCoolSpeedRatio = 1.0; // Fan speed ratio when no cooling or heating
147 : bool CheckFanFlow = true; // Check fan volumetric flow versus system flow in init routine.
148 : std::string DXCoolCoilName; // Name of DX cooling coil
149 : HVAC::CoilType CoolCoilType = HVAC::CoilType::Invalid;
150 : int CoolCoilCompIndex = 0; // cooling coil component index number
151 : int DXCoolCoilIndexNum = 0; // actual DX cooling coil index number
152 : int DXHeatCoilIndexNum = 0; // actual DX heating coil index number
153 : std::string HeatCoilName; // Name of heating coil
154 : HVAC::CoilType HeatCoilType = HVAC::CoilType::Invalid;
155 : int HeatCoilIndex = 0; // DX heating coil index number
156 : HVAC::FanOp fanOp = HVAC::FanOp::Invalid; // mode of operation
157 : int CoilControlNode = 0; // heating coil hot water or steam inlet node
158 : int CoilOutletNode = 0; // outlet node for hot water and steam coil
159 : PlantLocation plantLoc; // plant loop component location object for water heating coil
160 : int HotWaterCoilMaxIterIndex = 0; // Index to recurring warning message
161 : int HotWaterCoilMaxIterIndex2 = 0; // Index to recurring warning message
162 : Real64 MaxHeatCoilFluidFlow = 0.0; // water or steam mass flow rate for heating coil [kg/s]
163 : Real64 DesignHeatingCapacity = 0.0; // design heating capacity of the heating coil
164 : Real64 DesignSuppHeatingCapacity = 0.0; // Operating capacity of supplemental Heating Coil [W]
165 : Real64 MinOATCompressor = 0.0; // Minimum OAT for compressor operation [C]
166 : Real64 MinLATCooling = 0.0; // Minimum leaving air temp for compressor cooling operation [C]
167 : Real64 MaxLATHeating = 0.0; // Maximum leaving air temp for heating operation [C]
168 : // Report data
169 : Real64 TotHeatEnergyRate = 0.0; // Total heating output [W]
170 : Real64 TotHeatEnergy = 0.0; // Total heating output [J]
171 : Real64 TotCoolEnergyRate = 0.0; // Total cooling output [W]
172 : Real64 TotCoolEnergy = 0.0; // Total cooling output [J]
173 : Real64 SensHeatEnergyRate = 0.0; // Sensible heating output [W]
174 : Real64 SensHeatEnergy = 0.0; // Sensible heating output [J]
175 : Real64 SensCoolEnergyRate = 0.0; // Sensible cooling output [W]
176 : Real64 SensCoolEnergy = 0.0; // Sensible cooling output [J]
177 : Real64 LatHeatEnergyRate = 0.0; // Latent heating output [W]
178 : Real64 LatHeatEnergy = 0.0; // Latent heating output [J]
179 : Real64 LatCoolEnergyRate = 0.0; // Latent cooling output [W]
180 : Real64 LatCoolEnergy = 0.0; // Latent cooling output [J]
181 : Real64 ElecPower = 0.0; // Electricity consumed [W]
182 : Real64 ElecConsumption = 0.0; // Electricity consumed [J]
183 : Real64 FanPartLoadRatio = 0.0; // Fan part-load ratio for time step
184 : Real64 CompPartLoadRatio = 0.0; // Compressor part-load ratio for time step
185 : int LastMode = 0; // Last mode of operation, coolingmode or heatingmode
186 : AirFlowCtrlMode AirFlowControl = AirFlowCtrlMode::Invalid; // Fan control mode, UseCompressorOnFlow or UseCompressorOffFlow
187 : Real64 CompPartLoadFrac = 0.0; // Compressor part load ratio
188 : int AirLoopNumber = 0; // Air loop served by the CBVAV system
189 : int NumControlledZones = 0;
190 : Array1D_int ControlledZoneNum; // Index to controlled zones
191 : Array1D_int ControlledZoneNodeNum; // Zone node num of controlled zone
192 : Array1D_int CBVAVBoxOutletNode; // Outlet node of CBVAV Box in controlled zone
193 : Array1D_int ZoneSequenceCoolingNum; // Index to cooling sequence/priority for this zone
194 : Array1D_int ZoneSequenceHeatingNum; // Index to heating sequence/priority for this zone
195 : PriorityCtrlMode PriorityControl = PriorityCtrlMode::Invalid; // Control mode - CoolingPriority, HeatingPriority, ZonePriority or LoadPriority
196 : int NumZonesCooled = 0; // Number of zones requesting cooling
197 : int NumZonesHeated = 0; // Number of zones requesting heating
198 : int PLRMaxIter = 0; // Counter for recurring warning message
199 : int PLRMaxIterIndex = 0; // Index to recurring warning message
200 : int DXCoilInletNode = 0; // Inlet node number of DX cooling coil
201 : int DXCoilOutletNode = 0; // Outlet node number of DX cooling coil
202 : int HeatingCoilInletNode = 0; // Inlet node of heating coil
203 : int HeatingCoilOutletNode = 0; // Outlet node of heating coil
204 : int FanInletNodeNum = 0; // fan inlet node number
205 : Real64 OutletTempSetPoint = 0.0; // Oulet node temperature setpoint [C]
206 : Real64 CoilTempSetPoint = 0.0; // Coil oulet node temperature setpoint (inc. fan heat) [C]
207 : int HeatCoolMode = 0; // System operating mode (0 = floating, 1 = cooling, 2 = heating)
208 : Real64 BypassMassFlowRate = 0.0; // Bypass mass flow rate report variable [m3/s]
209 : HVAC::CoilMode DehumidificationMode = HVAC::CoilMode::Invalid; // Dehumidification mode (0=normal, 1=enhanced)
210 : DehumidControl DehumidControlType = DehumidControl::None; // Dehumidification control type (currently only for multimode coil)
211 : bool HumRatMaxCheck = true; // Used in Init for warning messages
212 : int DXIterationExceeded = 0; // Counter for DX coil messages
213 : int DXIterationExceededIndex = 0; // Counter for DX coil messages
214 : int DXIterationFailed = 0; // Counter for DX coil messages
215 : int DXIterationFailedIndex = 0; // Counter for DX coil messages
216 : int DXCyclingIterationExceeded = 0; // Counter for VS DX coil messages, when on/off cycling between off and speed 1
217 : int DXCyclingIterationExceededIndex = 0; // Counter for VS DX coil messages, when on/off cycling between off and speed 1
218 : int DXCyclingIterationFailed = 0; // Counter for VS DX coil messages, when on/off cycling between off and speed 1
219 : int DXCyclingIterationFailedIndex = 0; // Counter for VS DX coil messages, when on/off cycling between off and speed 1
220 : int DXHeatIterationExceeded = 0; // Counter for DX coil messages
221 : int DXHeatIterationExceededIndex = 0; // Counter for DX coil messages
222 : int DXHeatIterationFailed = 0; // Counter for DX coil messages
223 : int DXHeatIterationFailedIndex = 0; // Counter for DX coil messages
224 : int DXHeatCyclingIterationExceeded = 0; // Counter for VS DX coil messages, when on/off cycling between off and speed 1
225 : int DXHeatCyclingIterationExceededIndex = 0; // Counter for VS DX coil messages, when on/off cycling between off and speed 1
226 : int DXHeatCyclingIterationFailed = 0; // Counter for VS DX coil messages, when on/off cycling between off and speed 1
227 : int DXHeatCyclingIterationFailedIndex = 0; // Counter for VS DX coil messages, when on/off cycling between off and speed 1
228 : int HXDXIterationExceeded = 0; // Counter for HX assisted DX coil messages
229 : int HXDXIterationExceededIndex = 0; // Counter for HX assisted DX coil messages
230 : int HXDXIterationFailed = 0; // Counter for HX assisted DX coil messages
231 : int HXDXIterationFailedIndex = 0; // Counter for HX assisted DX coil messages
232 : int MMDXIterationExceeded = 0; // Counter for multimode DX coil messages
233 : int MMDXIterationExceededIndex = 0; // Counter for multimode DX coil messages
234 : int MMDXIterationFailed = 0; // Counter for multimode DX coil messages
235 : int MMDXIterationFailedIndex = 0; // Counter for multimode DX coil messages
236 : int DMDXIterationExceeded = 0; // Counter for dehumidifying multimode DX coil messages
237 : int DMDXIterationExceededIndex = 0; // Counter for dehumidifying multimode DX coil messages
238 : int DMDXIterationFailed = 0; // Counter for dehumidifying multimode DX coil messages
239 : int DMDXIterationFailedIndex = 0; // Counter for dehumidifying multimode DX coil messages
240 : int CRDXIterationExceeded = 0; // Counter for cool reheat multimode DX coil messages
241 : int CRDXIterationExceededIndex = 0; // Counter for cool reheat multimode DX coil messages
242 : int CRDXIterationFailed = 0; // Counter for cool reheat multimode DX coil messages
243 : int CRDXIterationFailedIndex = 0; // Counter for cool reheat multimode DX coil messages
244 : bool FirstPass = true; // used to determine when first call is made
245 : int plenumIndex = 0; // index to AirloopHVAC:ReturnPlenum
246 : int mixerIndex = 0; // index to AirloopHVAC:ZoneMixer
247 : Real64 changeOverTimer = -1.0; // timer to avoid rapid change of operating modes (e.g., cooling to heating)
248 : Real64 minModeChangeTime = -1.0; // time limit before mode change is allowed (hr)
249 : int OutNodeSPMIndex = 0; // set point manager index if exists on outlet node
250 : bool modeChanged = false; // identifies operating mode changed this time step
251 : };
252 :
253 : void SimUnitaryBypassVAV(EnergyPlusData &state,
254 : std::string_view CompName, // Name of the CBVAV system
255 : bool FirstHVACIteration, // TRUE if 1st HVAC simulation of system time step
256 : int AirLoopNum, // air loop index
257 : int &CompIndex // Index to changeover-bypass VAV system
258 : );
259 :
260 : void SimCBVAV(EnergyPlusData &state,
261 : int CBVAVNum, // Index of the current CBVAV system being simulated
262 : bool FirstHVACIteration, // TRUE if 1st HVAC simulation of system timestep
263 : Real64 &QSensUnitOut, // Sensible delivered capacity [W]
264 : Real64 &OnOffAirFlowRatio, // Ratio of compressor ON airflow to AVERAGE airflow over timestep
265 : bool HXUnitOn // flag to enable heat exchanger
266 : );
267 :
268 : void GetCBVAV(EnergyPlusData &state);
269 :
270 : void InitCBVAV(EnergyPlusData &state,
271 : int CBVAVNum, // Index of the current CBVAV unit being simulated
272 : bool FirstHVACIteration, // TRUE if first HVAC iteration
273 : int AirLoopNum, // air loop index
274 : Real64 &OnOffAirFlowRatio, // Ratio of compressor ON airflow to average airflow over timestep
275 : bool HXUnitOn // flag to enable heat exchanger
276 : );
277 :
278 : void SizeCBVAV(EnergyPlusData &state, int CBVAVNum); // Index to CBVAV system
279 :
280 : void ControlCBVAVOutput(EnergyPlusData &state,
281 : int CBVAVNum, // Index to CBVAV system
282 : bool FirstHVACIteration, // Flag for 1st HVAC iteration
283 : Real64 &PartLoadFrac, // Unit part load fraction
284 : Real64 &OnOffAirFlowRatio, // Ratio of compressor ON airflow to AVERAGE airflow over timestep
285 : bool HXUnitOn // flag to enable heat exchanger
286 : );
287 :
288 : void CalcCBVAV(EnergyPlusData &state,
289 : int CBVAVNum, // Unit index in fan coil array
290 : bool FirstHVACIteration, // Flag for 1st HVAC iteration
291 : Real64 &PartLoadFrac, // Compressor part load fraction
292 : Real64 &LoadMet, // Load met by unit (W)
293 : Real64 &OnOffAirFlowRatio, // Ratio of compressor ON airflow to AVERAGE airflow over timestep
294 : bool HXUnitOn // flag to enable heat exchanger
295 : );
296 :
297 : void GetZoneLoads(EnergyPlusData &state, int CBVAVNum // Index to CBVAV unit being simulated
298 : );
299 :
300 : Real64 CalcSetPointTempTarget(EnergyPlusData &state, int CBVAVNumber); // Index to changeover-bypass VAV system
301 :
302 : void SetAverageAirFlow(EnergyPlusData &state,
303 : int CBVAVNum, // Index to CBVAV system
304 : Real64 &OnOffAirFlowRatio // Ratio of compressor ON airflow to average airflow over timestep
305 : );
306 :
307 : void ReportCBVAV(EnergyPlusData &state, int CBVAVNum); // Index of the current CBVAV unit being simulated
308 :
309 : void CalcNonDXHeatingCoils(EnergyPlusData &state,
310 : int CBVAVNum, // Changeover bypass VAV unit index
311 : bool FirstHVACIteration, // flag for first HVAC iteration in the time step
312 : Real64 &HeatCoilLoad, // heating coil load to be met (Watts)
313 : HVAC::FanOp const fanOp, // fan operation mode
314 : Real64 &HeatCoilLoadmet // coil heating load met
315 : );
316 :
317 : } // namespace HVACUnitaryBypassVAV
318 :
319 : struct HVACUnitaryBypassVAVData : BaseGlobalStruct
320 : {
321 :
322 : // TODO: Try to eliminate these global-ish variables. Just use data stored right in the component instances.
323 : int NumCBVAV = 0; // Number of CBVAV systems in input file
324 : Real64 CompOnMassFlow = 0.0; // System air mass flow rate w/ compressor ON
325 : Real64 OACompOnMassFlow = 0.0; // OA mass flow rate w/ compressor ON
326 : Real64 CompOffMassFlow = 0.0; // System air mass flow rate w/ compressor OFF
327 : Real64 OACompOffMassFlow = 0.0; // OA mass flow rate w/ compressor OFF
328 : Real64 CompOnFlowRatio = 0.0; // fan flow ratio when coil on
329 : Real64 CompOffFlowRatio = 0.0; // fan flow ratio when coil off
330 : Real64 FanSpeedRatio = 0.0; // ratio of air flow ratio passed to fan object
331 : Real64 BypassDuctFlowFraction = 0.0; // Fraction of unit mass flow that returns to inlet of CBVAV unit through bypass duct
332 : Real64 PartLoadFrac = 0.0; // Compressor part-load fraction
333 : Real64 SaveCompressorPLR = 0.0; // Holds DX compressor PLR from active DX coil
334 : Real64 TempSteamIn = 100.0; // steam coil steam inlet temperature
335 : Array1D_bool CheckEquipName;
336 :
337 : EPVector<HVACUnitaryBypassVAV::CBVAVData> CBVAV;
338 : bool GetInputFlag = true; // Flag set to make sure you get input once
339 :
340 : bool MyOneTimeFlag = true; // Initialization flag
341 : // TODO: Get rid of these arrays, make them bools in the data structure and probably get rid of one time flag
342 : Array1D_bool MyEnvrnFlag; // Used for initializations each begin environment flag
343 : Array1D_bool MySizeFlag; // Used for sizing CBVAV inputs one time
344 : Array1D_bool MyPlantScanFlag; // Used for initializations plant component for heating coils
345 :
346 2126 : void init_constant_state([[maybe_unused]] EnergyPlusData &state) override
347 : {
348 2126 : }
349 :
350 1152 : void init_state([[maybe_unused]] EnergyPlusData &state) override
351 : {
352 1152 : }
353 :
354 2100 : void clear_state() override
355 : {
356 2100 : this->CBVAV.deallocate();
357 2100 : this->NumCBVAV = 0;
358 2100 : this->CompOnMassFlow = 0.0;
359 2100 : this->OACompOnMassFlow = 0.0;
360 2100 : this->CompOffMassFlow = 0.0;
361 2100 : this->OACompOffMassFlow = 0.0;
362 2100 : this->CompOnFlowRatio = 0.0;
363 2100 : this->CompOffFlowRatio = 0.0;
364 2100 : this->FanSpeedRatio = 0.0;
365 2100 : this->BypassDuctFlowFraction = 0.0;
366 2100 : this->PartLoadFrac = 0.0;
367 2100 : this->SaveCompressorPLR = 0.0;
368 2100 : this->TempSteamIn = 100.0;
369 2100 : this->CheckEquipName.deallocate();
370 2100 : this->GetInputFlag = true;
371 2100 : this->MyOneTimeFlag = true;
372 2100 : this->MyEnvrnFlag.deallocate();
373 2100 : this->MySizeFlag.deallocate();
374 2100 : this->MyPlantScanFlag.deallocate();
375 2100 : }
376 : };
377 :
378 : } // namespace EnergyPlus
379 :
380 : #endif
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