Line data Source code
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47 :
48 : #ifndef Fans_hh_INCLUDED
49 : #define Fans_hh_INCLUDED
50 :
51 : // ObjexxFCL Headers
52 : #include <ObjexxFCL/Array1D.hh>
53 : #include <ObjexxFCL/Optional.hh>
54 :
55 : // EnergyPlus Headers
56 : #include <EnergyPlus/Data/BaseData.hh>
57 : #include <EnergyPlus/DataGlobals.hh>
58 : #include <EnergyPlus/DataHVACGlobals.hh>
59 : #include <EnergyPlus/EnergyPlus.hh>
60 :
61 : namespace EnergyPlus {
62 :
63 : // Forward declarations
64 : struct EnergyPlusData;
65 :
66 : namespace Fans {
67 :
68 : // Fan Minimum Flow Fraction Input Method
69 : enum class MinFlowFracMethod
70 : {
71 : Invalid = -1,
72 : MinFrac,
73 : FixedMin,
74 : Num
75 : };
76 :
77 : enum class AvailManagerMode
78 : {
79 : Invalid = -1,
80 : Coupled,
81 : Decoupled,
82 : Num
83 : };
84 :
85 : static constexpr std::array<std::string_view, (int)AvailManagerMode::Num> availManagerModeNamesUC = {"COUPLED", "DECOUPLED"};
86 :
87 : struct FanBase
88 : {
89 2214 : FanBase()
90 2214 : {
91 2214 : }
92 :
93 0 : virtual ~FanBase() = default;
94 :
95 : virtual void set_size(EnergyPlusData &state) = 0;
96 :
97 : virtual void init(EnergyPlusData &state) = 0;
98 : virtual void simulate(EnergyPlusData &state,
99 : bool const FirstHVACIteration,
100 : ObjexxFCL::Optional<Real64 const> speedRatio = _, // Flow fraction in operating mode 1
101 : ObjexxFCL::Optional<Real64 const> pressureRise = _, // Pressure difference to use for DeltaPress
102 : ObjexxFCL::Optional<Real64 const> flowFraction = _, // Flow fraction in operating mode 1
103 : ObjexxFCL::Optional<Real64 const> massFlowRate1 = _, // Mass flow rate in operating mode 1 [kg/s]
104 : ObjexxFCL::Optional<Real64 const> runTimeFraction1 = _, // Run time fraction in operating mode 1
105 : ObjexxFCL::Optional<Real64 const> massFlowRate2 = _, // Mass flow rate in operating mode 2 [kg/s]
106 : ObjexxFCL::Optional<Real64 const> runTimeFraction2 = _, // Run time fraction in operating mode 2
107 : ObjexxFCL::Optional<Real64 const> pressureRise2 = _ // Pressure difference to use for operating mode 2
108 : );
109 :
110 : virtual void update(EnergyPlusData &state) = 0;
111 :
112 : virtual void report(EnergyPlusData &state) = 0;
113 :
114 : virtual Real64 getDesignHeatGain(EnergyPlusData &state, Real64 const FanVolFlow) = 0;
115 :
116 : virtual void getInputsForDesignHeatGain(EnergyPlusData &state,
117 : Real64 &deltaP,
118 : Real64 &motEff,
119 : Real64 &totEff,
120 : Real64 &motInAirFrac,
121 : Real64 &fanShaftPow,
122 : Real64 &motInPower,
123 : bool &fanCompModel) = 0;
124 : // Members
125 : std::string Name; // Name of the fan
126 : HVAC::FanType type = HVAC::FanType::Invalid; // DataHVACGlobals fan type
127 :
128 : bool envrnFlag = true; // initialize to true
129 : bool sizingFlag = true; // initialize to true, set to false after sizing routine
130 :
131 : std::string endUseSubcategoryName;
132 :
133 : int availSchedNum = 0; // Pointer to the availability schedule
134 : int inletNodeNum = 0;
135 : int outletNodeNum = 0;
136 : int airLoopNum = 0;
137 : bool airPathFlag = false; // Yes, this fan is a part of airpath
138 : bool isAFNFan = false; // Is fan part of and AirFlowNetwork distribution system
139 :
140 : Real64 maxAirFlowRate = 0.0; // Max Specified Volume Flow Rate of Fan [m3/sec]
141 : Real64 minAirFlowRate = 0.0; // Max Specified Volume Flow Rate of Fan [m3/sec]
142 : bool maxAirFlowRateIsAutosized = false;
143 :
144 : Real64 deltaPress = 0.0; // Delta Pressure Across the Fan [N/m2]
145 : Real64 deltaTemp = 0.0; // Temp Rise across the Fan [C]
146 :
147 : Real64 totalEff = 0.0; // Fan total system efficiency (fan*belt*motor*VFD)
148 :
149 : Real64 motorEff = 0.0; // Fan motor efficiency
150 : Real64 motorInAirFrac = 0.0; // Fraction of motor heat entering air stream
151 :
152 : // report variables
153 : Real64 totalPower = 0.0; // Power of the Fan being Simulated [W]
154 : Real64 totalEnergy = 0.0; // Fan energy in [J]
155 : // Real64 fanRuntimeFraction; // Fraction of the timestep that the fan operates
156 :
157 : Real64 powerLossToAir = 0.0; // fan heat gain into process air [W]
158 :
159 : Real64 inletAirMassFlowRate = 0.0; // MassFlow through the Fan being Simulated [kg/Sec]
160 : Real64 outletAirMassFlowRate = 0.0;
161 :
162 : Real64 maxAirMassFlowRate = 0.0; // Max flow rate of fan in kg/sec
163 : // Real64 m_minAirMassFlowRate; // Min flow rate of fan in kg/sec
164 : // int fanMinAirFracMethod; // parameter for what method is used for min flow fraction
165 : // Real64 fanFixedMin; // Absolute minimum fan air flow [m3/s]
166 : Real64 minAirMassFlowRate = 0.0; // Min flow rate of fan in kg/sec
167 :
168 : // Mass Flow Rate Control Variables
169 : Real64 massFlowRateMaxAvail = 0.0;
170 : Real64 massFlowRateMinAvail = 0.0;
171 : Real64 rhoAirStdInit = 0.0;
172 :
173 : Real64 inletAirTemp = 0.0;
174 : Real64 outletAirTemp = 0.0;
175 : Real64 inletAirHumRat = 0.0;
176 : Real64 outletAirHumRat = 0.0;
177 : Real64 inletAirEnthalpy = 0.0;
178 : Real64 outletAirEnthalpy = 0.0;
179 :
180 : // Faults
181 : bool faultyFilterFlag = false; // Indicate whether there is a fouling air filter corresponding to the fan
182 : int faultyFilterIndex = 0; // Index of the fouling air filter corresponding to the fan
183 :
184 : // EMS
185 : bool EMSMaxAirFlowRateOverrideOn = false; // if true, EMS wants to override fan size for Max Volume Flow Rate
186 : Real64 EMSMaxAirFlowRateValue = 0.0; // EMS value to use for override of Max Volume Flow Rate
187 : bool EMSMaxMassFlowOverrideOn = false; // if true, then EMS is calling to override mass flow
188 : Real64 EMSAirMassFlowValue = 0.0; // value EMS is directing to use [kg/s]
189 : bool EMSPressureOverrideOn = false; // if true, then EMS is calling to override
190 : Real64 EMSPressureValue = 0.0; // EMS value for Delta Pressure Across the Fan [Pa]
191 : bool EMSTotalEffOverrideOn = false; // if true, then EMS is calling to override
192 : Real64 EMSTotalEffValue = 0.0; // EMS value for total efficiency of the Fan, fraction on 0..1
193 :
194 : std::string sizingPrefix;
195 : };
196 :
197 : enum class VFDEffType
198 : {
199 : Invalid = -1,
200 : Speed,
201 : Power,
202 : Num
203 : };
204 :
205 : static constexpr std::array<std::string_view, (int)VFDEffType::Num> vfdEffTypeNamesUC = {"SPEED", "POWER"};
206 :
207 : struct FanComponent : public FanBase
208 : {
209 : void set_size(EnergyPlusData &state);
210 :
211 : void init(EnergyPlusData &state);
212 :
213 : Real64 getDesignHeatGain(EnergyPlusData &state, Real64 const FanVolFlow);
214 :
215 : void getInputsForDesignHeatGain(EnergyPlusData &state,
216 : Real64 &deltaP,
217 : Real64 &motEff,
218 : Real64 &totEff,
219 : Real64 &motInAirFrac,
220 : Real64 &fanShaftPow,
221 : Real64 &motInPower,
222 : bool &fanCompModel);
223 :
224 : void update(EnergyPlusData &state);
225 :
226 : void report(EnergyPlusData &state);
227 :
228 : void simulateConstant(EnergyPlusData &state);
229 :
230 : void simulateVAV(EnergyPlusData &state, ObjexxFCL::Optional<Real64 const> PressureRise = _);
231 :
232 : void simulateOnOff(EnergyPlusData &state, ObjexxFCL::Optional<Real64 const> SpeedRatio = _);
233 :
234 : void simulateZoneExhaust(EnergyPlusData &state);
235 :
236 : void simulateComponentModel(EnergyPlusData &state);
237 :
238 : Real64 runtimeFrac = 0.0;
239 :
240 : MinFlowFracMethod minAirFracMethod = MinFlowFracMethod::MinFrac; // parameter for what method is used for min flow fraction
241 :
242 : Real64 minFrac = 0.0; // Minimum fan air flow fraction
243 : Real64 fixedMin = 0.0; // Absolute minimum fan air flow [m3/s]
244 : std::array<Real64, 5> coeffs{0.0, 0.0, 0.0, 0.0, 0.0}; // Fan Part Load Coefficients to match fan type
245 : // Mass Flow Rate Control Variables
246 :
247 : int nightVentPerfNum = 0;
248 : int powerRatioAtSpeedRatioCurveNum = 0;
249 : int effRatioCurveNum = 0;
250 : bool oneTimePowerRatioCheck = true; // one time flag used for error message
251 : bool oneTimeEffRatioCheck = true; // one time flag used for error message
252 : Real64 wheelDia = 0.0; // Fan wheel outer diameter [m]
253 : Real64 outletArea = 0.0; // Fan outlet area [m2]
254 : Real64 maxEff = 0.0; // Fan maximum static efficiency [-]
255 : Real64 eulerMaxEff = 0.0; // Euler number at fan maximum static efficiency [-]
256 : Real64 maxDimFlow = 0.0; // Fan maximum dimensionless airflow [-]
257 : Real64 shaftPowerMax = 0.0; // Fan shaft maximum input power [W]
258 : Real64 sizingFactor = 0.0; // Fan sizing factor [-]
259 : Real64 pulleyDiaRatio = 0.0; // Motor/fan pulley diameter ratio [-]
260 : Real64 beltMaxTorque = 0.0; // Belt maximum torque [N-m]
261 : Real64 beltSizingFactor = 0.0; // Belt sizing factor [-]
262 : Real64 beltTorqueTrans = 0.0; // Belt fractional torque transition Region 1-2 [-]
263 : Real64 motorMaxSpeed = 0.0; // Motor maximum speed [rpm]
264 : Real64 motorMaxOutPower = 0.0; // Motor maximum output power [W]
265 : Real64 motorSizingFactor = 0.0; // Motor sizing factor [-]
266 : VFDEffType vfdEffType = VFDEffType::Invalid; // VFD efficiency type [Speed or Power]
267 : Real64 vfdMaxOutPower = 0.0; // VFD maximum output power [W]
268 : Real64 vfdSizingFactor = 0.0; // VFD sizing factor [-]
269 : int pressRiseCurveNum = 0; // Fan pressure rise curve index
270 : int pressResetCurveNum = 0; // Duct static pressure reset curve index
271 : int plTotalEffNormCurveNum = 0; // Fan part-load efficiency (normal) curve index
272 : int plTotalEffStallCurveNum = 0; // Fan part-load efficiency (stall) curve index
273 : int dimFlowNormCurveNum = 0; // Fan dimensionless airflow (normal) curve index
274 : int dimFlowStallCurveNum = 0; // Fan dimensionless airflow (stall) curve index
275 : int beltMaxEffCurveNum = 0; // Belt maximum efficiency curve index
276 : int plBeltEffReg1CurveNum = 0; // Belt part-load efficiency (Region 1) curve index
277 : int plBeltEffReg2CurveNum = 0; // Belt part-load efficiency (Region 2) curve index
278 : int plBeltEffReg3CurveNum = 0; // Belt part-load efficiency (Region 3) curve index
279 : int motorMaxEffCurveNum = 0; // Motor maximum efficiency curve index
280 : int plMotorEffCurveNum = 0; // Motor part-load efficiency curve index
281 : int vfdEffCurveNum = 0; // VFD efficiency curve index
282 : Real64 deltaPressTot = 0.0; // Total pressure rise across fan [N/m2]
283 : Real64 airPower = 0.0; // Air power for fan being Simulated [W]
284 : Real64 fanSpeed = 0.0; // Fan shaft rotational speed [rpm]
285 : Real64 fanTorque = 0.0; // Fan shaft torque [N-m]
286 : Real64 wheelEff = 0.0; // Fan efficiency (mechanical)
287 : Real64 shaftPower = 0.0; // Shaft input power for fan being Simulated [W]
288 : Real64 beltMaxEff = 0.0; // Belt maximum efficiency (mechanical)
289 : Real64 beltEff = 0.0; // Belt efficiency (mechanical)
290 : Real64 beltInputPower = 0.0; // Belt input power for fan being Simulated [W]
291 : Real64 motorMaxEff = 0.0; // Motor maximum efficiency (electrical)
292 : Real64 motorInputPower = 0.0; // Motor input power for fan being Simulated [W]
293 : Real64 vfdEff = 0.0; // VFD efficiency (electrical)
294 : Real64 vfdInputPower = 0.0; // VFD input power for fan being Simulated [W]
295 : // zone exhaust fan
296 : int flowFracSchedNum = 0; // schedule index flow rate modifier schedule
297 : AvailManagerMode availManagerMode = AvailManagerMode::Invalid; // mode for how exhaust fan should react to availability managers
298 : int minTempLimitSchedNum = 0; // schedule index minimum temperature limit
299 : int balancedFractSchedNum = 0; // schedule index portion recirculated
300 : Real64 unbalancedOutletMassFlowRate = 0.0;
301 : Real64 balancedOutletMassFlowRate = 0.0;
302 : Real64 designPointFEI = 0.0; // Fan Energy Index for the fan at the design operating point
303 : };
304 :
305 : struct NightVentPerfData
306 : {
307 : // Members
308 : std::string FanName; // Name of the fan that will use this data
309 : Real64 FanEff = 0.0; // Fan total efficiency; motor and mechanical
310 : Real64 DeltaPress = 0.0; // Delta Pressure Across the Fan [N/m2]
311 : Real64 MaxAirFlowRate = 0.0; // Max Specified Volume Flow Rate of Fan [m3/s]
312 : Real64 MaxAirMassFlowRate = 0.0; // Max flow rate of fan in kg/sec
313 : Real64 MotEff = 0.0; // Fan motor efficiency
314 : Real64 MotInAirFrac = 0.0; // Fraction of motor heat entering air stream
315 : };
316 :
317 : void GetFanInput(EnergyPlusData &state);
318 :
319 : int GetFanIndex(EnergyPlusData &state, std::string const &FanName);
320 :
321 : Real64 CalFaultyFanAirFlowReduction(EnergyPlusData &state,
322 : std::string const &FanName, // Name of the Fan
323 : Real64 FanDesignAirFlowRate, // Fan Design Volume Flow Rate [m3/s]
324 : Real64 FanDesignDeltaPress, // Fan Design Delta Pressure [Pa]
325 : Real64 FanFaultyDeltaPressInc, // Increase of Fan Delta Pressure in the Faulty Case [Pa]
326 : int FanCurvePtr // Fan Curve Pointer
327 : );
328 :
329 : enum class PowerSizing
330 : {
331 : Invalid = -1,
332 : PerFlow,
333 : PerFlowPerPressure,
334 : TotalEfficiencyAndPressure,
335 : Num
336 : };
337 :
338 : static constexpr std::array<std::string_view, (int)PowerSizing::Num> powerSizingNamesUC = {
339 : "POWERPERFLOW", "POWERPERFLOWPERPRESSURE", "TOTALEFFICIENCYANDPRESSURE"};
340 :
341 : enum class HeatLossDest
342 : {
343 : Invalid = -1,
344 : Zone,
345 : Outside,
346 : Num
347 : };
348 :
349 : enum class SpeedControl : int
350 : {
351 : // TODO: enum check
352 : Invalid = -1,
353 : Discrete,
354 : Continuous,
355 : Num
356 : };
357 :
358 : static constexpr std::array<std::string_view, (int)SpeedControl::Num> speedControlNamesUC = {"DISCRETE", "CONTINUOUS"};
359 :
360 : class FanSystem : public FanBase
361 : {
362 : public: // Methods
363 229 : FanSystem()
364 229 : {
365 229 : }
366 : // Destructor
367 0 : ~FanSystem()
368 0 : {
369 0 : }
370 :
371 : // Copy Constructor
372 : FanSystem(FanSystem const &) = default;
373 :
374 : Real64 getDesignTemperatureRise(EnergyPlusData &state) const;
375 :
376 : Real64 getDesignHeatGain(EnergyPlusData &state, Real64 const FanVolFlow);
377 :
378 : void getInputsForDesignHeatGain(EnergyPlusData &state,
379 : Real64 &deltaP,
380 : Real64 &motEff,
381 : Real64 &totEff,
382 : Real64 &motInAirFrac,
383 : Real64 &fanShaftPow,
384 : Real64 &motInPower,
385 : bool &fanCompModel);
386 :
387 : SpeedControl speedControl = SpeedControl::Invalid; // Discrete or Continuous speed control method
388 : Real64 designElecPower = 0.0; // design electric power consumption [W]
389 : int powerModFuncFlowFracCurveNum = 0; // pointer to performance curve or table
390 : int numSpeeds = 0; // input for how many speed levels for discrete fan
391 : std::vector<Real64> massFlowAtSpeed;
392 : std::vector<Real64> flowFracAtSpeed; // array of flow fractions for speed levels
393 :
394 : // Mass Flow Rate Control Variables
395 : bool isSecondaryDriver = false; // true if this fan is used to augment flow and may pass air when off.
396 :
397 : // FEI
398 : static Real64 report_fei(EnergyPlusData &state, Real64 const designFlowRate, Real64 const designElecPower, Real64 const designDeltaPress);
399 :
400 : void init(EnergyPlusData &state);
401 :
402 : void set_size(EnergyPlusData &state);
403 :
404 : void
405 : calcSimpleSystemFan(EnergyPlusData &state,
406 : ObjexxFCL::Optional<Real64 const> flowFraction, // Flow fraction for entire timestep (not used if flow ratios are present)
407 : ObjexxFCL::Optional<Real64 const> pressureRise, // Pressure difference to use for DeltaPress
408 : ObjexxFCL::Optional<Real64 const> flowRatio1, // Flow ratio in operating mode 1
409 : ObjexxFCL::Optional<Real64 const> runTimeFrac1, // Run time fraction in operating mode 1
410 : ObjexxFCL::Optional<Real64 const> flowRatio2, // Flow ratio in operating mode 2
411 : ObjexxFCL::Optional<Real64 const> runTimeFrac2, // Run time fraction in operating mode 2
412 : ObjexxFCL::Optional<Real64 const> pressureRise2 // Pressure difference to use for operating mode 2
413 : );
414 :
415 : void update(EnergyPlusData &state);
416 :
417 : void report(EnergyPlusData &state);
418 :
419 : public:
420 : // data
421 : Real64 minPowerFlowFrac = 0.0; // Minimum fan air flow fraction for power calculation
422 : bool designElecPowerWasAutosized = false;
423 : PowerSizing powerSizingMethod = PowerSizing::Invalid; // sizing method for design electric power, three options
424 : Real64 elecPowerPerFlowRate = 0.0; // scaling factor for PowerPerFlow method
425 : Real64 elecPowerPerFlowRatePerPressure = 0.0; // scaling factor for PowerPerFlowPerPressure
426 : Real64 nightVentPressureDelta = 0.0; // fan pressure rise during night ventilation mode
427 : Real64 nightVentFlowFraction = 0.0; // fan's flow fraction during night ventilation mode, not used
428 : int zoneNum = 0; // zone index for motor heat losses as internal gains
429 : Real64 zoneRadFract = 0.0; // thermal radiation split for motor losses
430 : HeatLossDest heatLossDest = HeatLossDest::Invalid; // enum for where motor loss go
431 : Real64 qdotConvZone = 0.0; // fan power lost to surrounding zone by convection to air (W)
432 : Real64 qdotRadZone = 0.0; // fan power lost to surrounding zone by radiation to zone surfaces(W)
433 : std::vector<Real64> powerFracAtSpeed; // array of power fractions for speed levels
434 : std::vector<bool> powerFracInputAtSpeed;
435 : // calculation variables
436 : std::vector<Real64> totalEffAtSpeed;
437 : std::vector<Real64> runtimeFracAtSpeed;
438 :
439 : Real64 designPointFEI = 0.0; // Fan Energy Index for the fan at the design operating point
440 :
441 : }; // class FanSystem
442 :
443 : } // namespace Fans
444 :
445 : struct FansData : BaseGlobalStruct
446 : {
447 : int NumNightVentPerf = 0; // number of FAN:NIGHT VENT PERFORMANCE objects found in the input
448 : bool GetFanInputFlag = true; // Flag set to make sure you get input once
449 : bool MyOneTimeFlag = true;
450 : bool ZoneEquipmentListChecked = false;
451 :
452 : Array1D<Fans::NightVentPerfData> NightVentPerf;
453 : int ErrCount = 0;
454 :
455 : Array1D<Fans::FanBase *> fans;
456 : std::map<std::string, int> fanMap;
457 :
458 796 : void init_state([[maybe_unused]] EnergyPlusData &state) override
459 : {
460 796 : }
461 :
462 0 : void clear_state() override
463 : {
464 0 : for (int i = 1; i <= (int)fans.size(); ++i)
465 0 : delete fans(i);
466 :
467 0 : fans.clear();
468 0 : fanMap.clear();
469 :
470 0 : new (this) FansData();
471 0 : }
472 : };
473 :
474 : } // namespace EnergyPlus
475 :
476 : #endif
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