​​​​​​​Modules​​​​​​​

When you start with a project you first have to identify the critical operating points.

Typically you setup your cooling system for steady state operating points. With the help of KULI base you can work on the following typical tasks:

• Calculation of the performance of each component built in and the complete system (results are temperatures, pressure losses, volume flows, heat rejection …)
• Design of engine cooling components for different media, like
  • Coolant
  • Different oil types
  • Charge air
  • Exhaust gas
• Evaluation of the interaction between the components

With these results you go on to optimize your system. With the use of the other KULI modules you can work on more detailed tasks or you can use some automatic optimization routines.

Due to the increasing importance of passenger comfort, KULI hvac is the right solution for the dimensioning of you air conditioning system.

The module KULI hvac can be used as a standalone program or as an add-on to KULI base.

KULI hvac enables to

• Design and optimize your refrigerant circuit according to refrigerant charge, COP (coefficient of performance) and control strategies
• Simulate with different refrigerants like  R134a, CO₂ , R152a, or R1234yf
• Analyze the passenger comfort using the multi zone cabin model
• Determine various measures for a quick heat-up or cool-down of the passenger compartment

When KULI hvac is coupled with KULI base, the interactions of the components in the refrigerant circuit with those in the engine cooling circuit can be observed. This is certainly a significant aspect when considering recent developments like the battery cooling system of an electric vehicle.

Reduction of the fuel consumption is the challenge nowadays.

Several ways are leading to this target. With KULI eco you can choose between

• Waste Heat Recovery (WHR) systems, e.g. Rankine Cycle, TEG
• Add electrical components, as
  • Electric Machine
  • Battery (on several system levels, like, cell, module, battery)
  • Inverter, Converter

All these features are working for combined systems (HEV) or battery electric vehicles (BEV). Coupling with KULI hvac can be necessary sometimes for the simulation of battery cooling.

For efficient work and to avoid iterations ‘by hand’ the KULI advanced module offers features like

• Parameter variation (what if scenarios)
• Automatic optimization by defining optimization targets and optimization parameters

KULI provides interfaces to integrate the results out of 3D-CFD calculations for:

• Consideration of non-uniform air flow distribution
• Coupling with CFD codes (co-simulation)

KULI advanced offers the possibility to couple KULI with other software-tools, for example if the control unit of a fan or other electrical component was programmed with an external program. 

• Interfaces to external programs, e.g.
  • KULI supports the FMI standard by simple creation of a FMU
  • by Microsoft COM technology and Visual Basic code
  • with direct access to Matlab/Simulink

After calibrating your steady state simulation model the next step in your project can be done.

You may define a customer specific driving cycle or consider the standardized driving cycles and perform a transient simulation (warm-up or cool-down).

KULI drive supports you with following features:

• Transient calculation (by definition of operating conditions at different time steps)
• Consideration of the warm up and cool down of various components
• 4-/5-mass engine model for the consideration of friction losses at different temperatures
• Thermal network to model complex thermal correlations
• Thermal behavior on a defined route (velocity vs. time), e.g. NEDC, FTP75
• Design of optimized control strategies to minimize the friction losses as well as energy consumption