Air Conditioning and Heating
Fast and Robust Simulation of Two-Phase Flows
See the Air Conditioning and Heating Brochure (PDF)
GT-SUITE has a highly advanced capability for solving two-phase flows. It is based on the same
proven flow solver used for a wide range of fluid simulations in GT-SUITE, such as engine performance,
fuel injection and hydraulics. It handles two-phase fluids based NIST REFPROP thermodynamic properties,
complemented by a variety of two-phase flow heat transfer and pressure drop correlations. The model is
completely transient, to allow a broad range of investigations. Because of its strong fundamental
flow solution methodology, it is very robust and allows the simulation to start from an arbitrary
starting point. The code execution is faster than real-time.
GT-SUITE models all types of air conditioning systems, including both fixed orifice tube and accumulator
systems, and thermal expansion valve (TXV) and receiver/dryer systems. It also handles transcritical
systems (e.g. CO2 and HFO-1234yf). As with all GT-SUITE models, these models are object oriented,
which allows for optimum flexibility and creation of various configurations such as branched
multi-evaporator systems, as well as open-circuit modeling for component calibration.
Transient Operation and Driving Cycles
Because of its fully transient capability, coupled with vehicle, engine and thermal management
capabilities, GT-SUITE can simulate operation under the new SC03 driving cycle, providing
information about the effects of AC operation on vehicle energy consumption. The two figures below
show results from such a simulation, with the prescribed vehicle speed on the left, and the predicted
evaporator air outlet temperature on the right.
Cabin Cooling
Modeling of air conditioning also includes the modeling of the passenger cabin. There are two models
available in GT-SUITE. One is a lumped analysis, using a modular cabin object (shown below on the left),
that handles cooling air flow, recirculation, solar radiation, and heat transfer through the frame
This object can be used to build-up a multi-volume representation of the cabin to various degrees of
detail, from a single volume to several volumes assembled together.
To obtain a more detailed prediction of 3-D air flow and temperatures within the cabin one may
use the CAD based preprocessor COOL3D to build a 3-D model of the cabin (see above on the right),
discretized into hundreds of sub-volumes to resolve the flow around the passengers. It offers a rapid
3-D coarse CFD calculation, well suited for example for the prediction of temperature at the passenger face
during cabin cooldown.
Product Highlights:
- Model all A/C systemcomponents individually or as a complete system
- Detailed spatially resolved condenser and evaporator models
- REFPROP properties of refrigerants and mixtures
- Robust solver based on Navier-Stokes equations
- Sub- and super-critical two-phase systems
- Smooth start from any initial condition
- Stable even with zero flow and thus “standing water” presents no difficulty
- Fast execution (faster than real-time)
- Multiple level of models of compressors, pumps, turbines and expanders, all the way to prediction
of mechanical losses
- Contains models of:
• vehicle
• engine
• condenser
• evaporator
• fixed orifice tube and accumulator
• thermal expansion valve (TXV) and receiver/dryer
• cabin
• compressor
• blower
• fluid machinery
• electrical components
• controls
- Refrigerant pressure drop and heat transfer correlations, including predictive heat transfer
based on HX geometry - Includes humidity effects
- All above models are highly capable, and establish a new level of state-of-the-art
- Suitable for SCO3 driving cycle energy analysis
- Seamless integration of vehicle and engine models
- No extra cost, included in every GT-SUITE license
 For more information contact:(or contact us online) |
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| Gamma Technologies, Inc. 601 Oakmont Lane, Suite 220 Westmont, IL 60559 USA |
Tel. Fax. (630) 325-5849 Email:CAE@gtisoft.com Web:www.gtisoft.com |
APPLICATIONS
Engine Performance
Test Pressure Analysis
Exhaust Aftertreatment
Acoustics
SiL, HiL, real-time
Vehicle, driveline
Hybrid Vehicles
Cooling Systems
AC and Rankine
Lubrication and bearings
Fuel Injection
Valvetrain, camshaft
Cranktrain, crankshaft
Chain, gear, belt drive