The document discusses an air conditioning loop simulation using numenGo software. The numenGo software contains libraries for modeling thermal fluids and two-phase mixtures. It can model an AC loop including a condenser with multiple plate passes, an evaporator, and analyze refrigerant properties, air flows, heat exchanger performance, and cycle optimization. The software provides components for modeling moist air conditions and extended surface heat exchangers.

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Air Conditioning systems
simulation with numenGo|FL
Example of a R407C AC loop

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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. condenser
2. expansion valve
3. evaporator
4. compressor

3. © 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 | FFC
numenGo|FL
numenGo | MPS
SIMULATION PLATFORM
Cryogenics
Propulsion
etc..
Business Oriented Library
APPLICATIVE
SOLUTIONS
THEIR expertise
OUR expertise
YOUR expertise

4. © 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 | FFC
numenGo|FL
numenGo | MPS
SIMULATION PLATFORM
HVAC
Moist-Air Add-on
APPLICATIVE
SOLUTIONS
Heat Exchanger Add-on

5. © numenGo | www.numengo.com 5/19
Software Components
● numenGo|FL
Contains high level components
numenGo | FFC
numenGo|FL
numenGo | MPS
SIMULATION PLATFORM
Moist-Air Add-on Heat Exchanger Add-on

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Software Components
● numenGo|FL
polymorphic components
Thermodynamic sources
flow sources
Heat exchanges

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Software Components
● numenGo|FL
polymorphic components
● Pipes
● Distributed models
● Dynamic discretization
● Flexible geometry
● Optional Inertial effects
● Convective heat exchange

8. © 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 | FFC
numenGo|FL
numenGo | MPS
SIMULATION PLATFORM
Moist-Air Add-on Heat Exchanger Add-on

9. © 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

10. © 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 | FFC
numenGo|FL
numenGo | MPS
SIMULATION PLATFORM
Moist-Air Add-on Heat Exchanger Add-on

11. © 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

12. © 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 | FFC
numenGo|FL
numenGo | MPS
SIMULATION PLATFORM
Moist-Air Add-on Heat Exchanger Add-on

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AC loop model

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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

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● Fin/plate assembly
● Geometrical description
● Dynamic discretization
● Flow
● Wall
● Air Flow

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AC loop model
● Evaporator modeling
3 passes of 6 plates
plate/fin convective exchange
plate/fin solid thermal capacity
internal convective exchange
internal flow

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Air Flow results
● Visualization of air profiles
● Temperature, velocity, relative humidity over time

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AC loop - Possible studies
● Refrigerant loop sizing and optimization
● Cycle performance
● Stability analysis
● Control strategies & normalized cycles
● Heat Exchanger stacking
● Thermal synthesis

19. © 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