Compressor models¶
-
class
PythonModel.compressors.
ReciprocatingCompressor
(parameters)¶ Bases:
object
Object for reciprocating compressor model based on Jin (2002): H. Jin. Parameter estimation based models of water source heat pumps. PhD Thesis. Oklahoma State University. Stillwater, Oklahoma, USA. 2012.
- Parameters
pisDis – Piston displacement (m3/s).
cleFac – Clearance factor (-).
etaEle – Electro-mechanical efficiency (-).
PLos – Constant part of the power losses (W).
pDro – Pressure drop at compressor suction and discharge (Pa).
dTSup – Degree of superheating (K).
-
get_DischargePressure
(pCon)¶ Evaluate the discharge pressure (Pa).
- Parameters
pCon – Condensing pressure (Pa).
- Returns
Discharge pressure (Pa).
- Usage: Type
>>> com = ReciprocatingCompressor([0.00162, 0.069, 0.696, 100.0, 99.29e3, 9.82]) >>> '%.1f' % com.get_DischargePressure(1.879e6) '1978290.0'
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get_Power
(vSuc, ref, pDis, pSuc, TSuc, **kargs)¶ Evaluate the power input to the compressor.
- Parameters
vSuv – Suction specific volume (m3/kg).
ref – Refrigerant model.
pDis – Discharge pressure (Pa).
pSuc – Suction pressure (Pa).
TSuc – Suction temperature (K).
- Returns
Power input to the compressor (W).
- Usage: Type
>>> import refrigerants >>> ref = refrigerants.R410A() >>> com = ReciprocatingCompressor([0.00162, 0.069, 0.696, 100.0, 99.29e3, 9.82]) >>> '%.2f' % com.get_Power(0.0288, ref, 1978290.0, 983710.0, 292.97) '1765.63'
-
get_RefrigerantMassFlowRate
(vSuc, ref, pDis, pSuc, TSuc, **kargs)¶ Evaluate the refrigerant mass flow rate.
- Parameters
vSuv – Suction specific volume (m3/kg).
ref – Refrigerant model.
pDis – Discharge pressure (Pa).
pSuc – Suction pressure (Pa).
TSuc – Suction temperature (K).
- Returns
Refrigerant mass flow rate (kg/s).
- Usage: Type
>>> import refrigerants >>> ref = refrigerants.R410A() >>> com = ReciprocatingCompressor([0.00162, 0.069, 0.696, 100.0, 99.29e3, 9.82]) >>> '%.8f' % com.get_RefrigerantMassFlowRate(0.0288, ref, 1978290.0, 983710.0, 292.97) '0.05358166'
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get_SuctionPressure
(pEva)¶ Evaluate the suction pressure.
- Parameters
pEva – Evaporating pressure (Pa).
- Returns
Suction pressure (Pa).
- Usage: Type
>>> com = ReciprocatingCompressor([0.00162, 0.069, 0.696, 100.0, 99.29e3, 9.82]) >>> '%.1f' % com.get_SuctionPressure(1.083e6) '983710.0'
-
get_SuctionTemperature
(TEva)¶ Evaluate the suction temperature.
- Parameters
TEva – Evaporating temperature (K).
- Returns
Suction temperature (K).
- Usage: Type
>>> com = ReciprocatingCompressor([0.00162, 0.069, 0.696, 100.0, 99.29e3, 9.82]) >>> '%.2f' % com.get_SuctionTemperature(283.15) '292.97'
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initialGuessParameters
(Q_nominal, P_nominal, TSou_nominal, TLoa_nominal, ref, CoolingMode)¶ Initialize guess parameters for calibration of the heat pump model.
- Parameters
Q_nominal – Nominal heat pump capacity (W).
P_nominal – Nominal power input (W).
TSou_nominal – Source-side water temperature at nominal conditions (K).
TLoa_nominal – Load-side water temperature at nominal conditions (K).
ref – Refrigerant model.
CoolingMode – Boolean, True if heat pump is in cooling mode.
- Returns
A list of parameters to the compressor model, a list of tuples of the bounds of the parameters (min, max) for the calibration routine.
-
modelicaModelPath
()¶ - Returns the full path to the compressor model in the Buildings
library.
- Returns
Full path to the compressor model in the IBPSA library.
- Usage: Type
>>> com = ReciprocatingCompressor([0.00162, 0.069, 0.696, 100.0, 99.29e3, 9.82]) >>> com.modelicaModelPath() 'IBPSA.Fluid.HeatPumps.Compressors.ReciprocatingCompressor'
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printParameters
()¶ Prints the value of the model parameters.
-
reinitializeParameters
(parameters)¶ Reinitializes the compressor using new parameters.
- Parameters
pisDis – Piston displacement (m3/s).
cleFac – Clearance factor (-).
etaEle – Electro-mechanical efficiency (-).
PLos – Constant part of the power losses (W).
pDro – Pressure drop at compressor suction and discharge (Pa).
dTSup – Degree of superheating (K).
-
class
PythonModel.compressors.
ScrollCompressor
(parameters)¶ Bases:
object
Object for scroll compressor model based on Jin (2002): H. Jin. Parameter estimation based models of water source heat pumps. PhD Thesis. Oklahoma State University. Stillwater, Oklahoma, USA. 2012.
- Parameters
volRat – Volume ratio (-).
v_flow – Nominal Volume flow rate (m3/s).
leaCoe – LEakage coefficient (kg/s).
etaEle – Electro-mechanical efficiency (-).
PLos – Constant part of the power losses (W).
dTSup – Degree of superheating (K).
-
get_DischargePressure
(pCon)¶ Evaluate the discharge pressure (Pa).
- Parameters
pCon – Condensing pressure (Pa).
- Returns
Discharge pressure (Pa).
- Usage: Type
>>> com = ScrollCompressor([2.362, 0.00287, 0.0041, 0.922, 398.7, 6.49]) >>> '%.1f' % com.get_DischargePressure(1.879e6) '1879000.0'
-
get_Power
(vSuc, ref, pDis, pSuc, TSuc)¶ Evaluate the power input to the compressor.
- Parameters
vSuv – Suction specific volume (m3/kg).
ref – Refrigerant model.
pDis – Discharge pressure (Pa).
pSuc – Suction pressure (Pa).
TSuc – Suction temperature (K).
- Returns
Power input to the compressor (W).
- Usage: Type
>>> import refrigerants >>> ref = refrigerants.R410A() >>> com = ScrollCompressor([2.362, 0.00287, 0.0041, 0.922, 398.7, 6.49]) >>> '%.2f' % com.get_Power(0.025, ref, 1.879e6, 1.083e6, 289.64) '2940.26'
-
get_RefrigerantMassFlowRate
(vSuc, pDis, pSuc, **kargs)¶ Evaluate the refrigerant mass flow rate.
- Parameters
vSuv – Suction specific volume (m3/kg).
pDis – Discharge pressure (Pa).
pSuc – Suction pressure (Pa).
TSuc – Suction temperature (K).
- Returns
Refrigerant mass flow rate (kg/s).
- Usage: Type
>>> com = ScrollCompressor([2.362, 0.00287, 0.0041, 0.922, 398.7, 6.49]) >>> '%.6f' % com.get_RefrigerantMassFlowRate(0.025, 1.879e6, 1.083e6) '0.107687'
-
get_SuctionPressure
(pEva)¶ Evaluate the suction pressure.
- Parameters
pEva – Evaporating pressure (Pa).
- Returns
Suction pressure (Pa).
- Usage: Type
>>> com = ScrollCompressor([2.362, 0.00287, 0.0041, 0.922, 398.7, 6.49]) >>> '%.1f' % com.get_SuctionPressure(1.083e6) '1083000.0'
-
get_SuctionTemperature
(TEva)¶ Evaluate the suction temperature.
- Parameters
TEva – Evaporating temperature (K).
- Returns
Suction temperature (K).
- Usage: Type
>>> com = ScrollCompressor([2.362, 0.00287, 0.0041, 0.922, 398.7, 6.49]) >>> '%.2f' % com.get_SuctionTemperature(283.15) '289.64'
-
initialGuessParameters
(Q_nominal, P_nominal, TSou_nominal, TLoa_nominal, ref, CoolingMode)¶ Initialize guess parameters for calibration of the heat pump model.
- Parameters
Q_nominal – Nominal heat pump capacity (W).
P_nominal – Nominal power input (W).
TSou_nominal – Source-side water temperature at nominal conditions (K).
TLoa_nominal – Load-side water temperature at nominal conditions (K).
ref – Refrigerant model.
CoolingMode – Boolean, True if heat pump is in cooling mode.
- Returns
A list of parameters to the compressor model, a list of tuples of the bounds of the parameters (min, max) for the calibration routine.
-
modelicaModelPath
()¶ - Returns the full path to the compressor model in the Buildings
library.
- Returns
Full path to the compressor model in the IBPSA library.
- Usage: Type
>>> com = ScrollCompressor([2.362, 0.00287, 0.0041, 0.922, 398.7, 6.49]) >>> com.modelicaModelPath() 'IBPSA.Fluid.HeatPumps.Compressors.ScrollCompressor'
-
printParameters
()¶ Prints the value of the model parameters.
-
reinitializeParameters
(parameters)¶ Reinitializes the compressor using new parameters.
- Parameters
volRat – Volume ratio (-).
v_flow – Nominal Volume flow rate (m3/s).
leaCoe – LEakage coefficient (kg/s).
etaEle – Electro-mechanical efficiency (-).
PLos – Constant part of the power losses (W).
dTSup – Degree of superheating (K).
-
set_ModelicaParameters
(simulator, suffix='')¶ Set parameter values for simulation in dymola.
- Parameters
simulator – Simulator object (BuildinsPy)
suffix – String to add at the end of parameter names.
- Returns
Simulator object (BuildingsPy)