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© numenGo | www.numengo.com 1/19
Air Conditioning systems simulation with numenGo|FL
Example of a R407C AC loop
© numenGo | www.numengo.com 2/19
Air Conditioning loop specifics
● Media● Refrigerant
● Two-phase description● R407C : mixture !
● Moist Air● Influence of relative humidity● Condensation
● Two phase flows● Two-phase pressure drops● Two-phase heat convection
● Boiling● Condensation
● Heat Exchanger● Extended Surface● 2D external flow
1. condenser2. expansion valve3. evaporator4. compressor
© numenGo | www.numengo.com 3/19
numenGo
● Thermal Fluids modeling and simulation specialists● Our Vision
● Capitalize modeling know-how in evolutive, generic, platform independant libraries
numenGo | FFCnumenGo|FL
numenGo | MPS
SIMULATION PLATFORMC
r yo ge n ic s
Pr op ul si on
etc ..
Business Oriented Library
APPLICATIVESOLUTIONS
THEIR expertise
OUR expertise
YOUR expertise
© numenGo | www.numengo.com 4/19
numenGo
● Thermal Fluids modeling and simulation specialists● Our Vision
● Capitalize modeling know-how in evolutive, generic, platform independant libraries
numenGo | FFCnumenGo|FL
numenGo | MPS
SIMULATION PLATFORM
HV
AC
Moist-Air Add-on
APPLICATIVESOLUTIONS
Heat Exchanger Add-on
© numenGo | www.numengo.com 5/19
Software Components
● numenGo|FLContains high level components
numenGo | FFCnumenGo|FL
numenGo | MPS
SIMULATION PLATFORM
Moist-Air Add-on Heat Exchanger Add-on
© numenGo | www.numengo.com 6/19
Software Components
● numenGo|FLpolymorphic components
Thermodynamic sources
flow sources
Heat exchanges
© numenGo | www.numengo.com 7/19
Software Components
● numenGo|FLpolymorphic components
● Pipes● Distributed models
● Dynamic discretization
● Flexible geometry● Optional Inertial effects● Convective heat exchange
© numenGo | www.numengo.com 8/19
Software Components
● numenGo|MPS
● A Media Property Server to compute fluid or solids thermodynamic properties, optimized for system simulation
● Compute thermodynamic properties for all state of matter:● Liquid, gas, two-phase or solid● Pure compound or mixture
● From simple description (ie perfect gas) to most precise state of the art descriptions (ie fundamental equation of state of Helmholtz, ECS, etc...
New Feature hightlight : 2-phase mixtures
numenGo | FFCnumenGo|FL
numenGo | MPS
SIMULATION PLATFORM
Moist-Air Add-on Heat Exchanger Add-on
© numenGo | www.numengo.com 9/19
Software Components
● numenGo|MPS : 2-phase mixtures
● Equation of state : GERG2004/2008● Transport properties : Extended Corresponding States
Optimized for system simulation
© numenGo | www.numengo.com 10/19
Software Components
● numenGo|FFC
provides all base objects to solve mass and heat transfer
● Mass transfer models● Flow equations
● incompressible, real fluid compressible, perfect gas compressible
● Flow resistance models● Friction factor models (Colebrook, Churchill,...)● Flow resistance models (2-K method, Cq, Crane...)● Two-phase flow
● Two-phase correlations (Friedel, Bankoff...)● Slip ratios (homogeneous, Chisholm, Zivi...)● Bulk properties (Dukler, Cicchitti, McAdams...)
● Flow component models (tee junction, pumps, turbines, ejectors...)
numenGo | FFCnumenGo|FL
numenGo | MPS
SIMULATION PLATFORM
Moist-Air Add-on Heat Exchanger Add-on
© numenGo | www.numengo.com 11/19
Software Components
● numenGo|FFC
provides all base objects to solve mass and heat transfer
● Heat transfer models● Conduction● Forced and free convection
● NTU● Two-phase forced convection
● Boiling (Chen, VDI...)● Condensation (Shah, Cavallini & Zecchin...)
● Radiation
© numenGo | www.numengo.com 12/19
Software Components
● Moist-Air add-on● Single condensate / vapour mixture equilibrium● Sources, sensors with humidity variable
● Heat Exchanger add-on● 2-D air flux components to describe air flow profiles● Extended surface heat exchanger components
numenGo | FFCnumenGo|FL
numenGo | MPS
SIMULATION PLATFORM
Moist-Air Add-on Heat Exchanger Add-on
© numenGo | www.numengo.com 14/19
AC loop model
● Condenser modeling
pass 1 : 9 plates
pass 2 : 6 plates
pass 3 : 4 plates
plate/fin convective exchange
plate/fin solid thermal capacity
internal convective exchange
internal flow
© numenGo | www.numengo.com 15/19
● Fin/plate assembly● Geometrical description● Dynamic discretization
● Flow● Wall● Air Flow
© numenGo | www.numengo.com 16/19
AC loop model
● Evaporator modeling
3 passes of 6 plates
plate/fin convective exchange
plate/fin solid thermal capacity
internal convective exchange
internal flow
© numenGo | www.numengo.com 17/19
Air Flow results
● Visualization of air profiles● Temperature, velocity, relative humidity over time
© numenGo | www.numengo.com 18/19
AC loop - Possible studies
● Refrigerant loop sizing and optimization
● Cycle performance
● Stability analysis
● Control strategies & normalized cycles
● Heat Exchanger stacking
● Thermal synthesis
© numenGo | www.numengo.com 19/19
Conclusion
● numenGo|FL● Advanced generic library for thermal fluid MBSE
● 2-phase mixtures NEW● State of the art descriptions● Optimized algorithms for system simulation● Fixed and variable composition● Extensive and scalable database
● Refrigerants, NLG, etc...
● Moist-Air and Heat Exchanger add-ons NEW● Water condensation● 2D external flows – heat exchanger stacking● Extends numenGo|FL for ECS and HVAC applications