Vehicle Thermal Management (VTM)

Driven by the need to reduce emissions, alternative and innovative powertrain and HVAC design has become vital for OEM’s to remain competitive and to provide solutions to meet impending emission legislation. Flowmaster V7 Automotive enables engineers to model complete Vehicle Thermal Management systems bringing together Air Conditioning, Cabin, Cooling and Lubrication Systems to understand the interaction of each system on one another and on the overall performance of the vehicle thermal management.

The Vehicle Thermal Management systems packages combine the capabilities of the Air Conditioning, Cooling and Lubrication packages together with the vehicle Cabin Component to provide a total Vehicle Thermal Management solution.

The Flowmaster V7 Cabin Component takes into account different thermal loads, air flows, cabin sub-components and environmental factors to predict the mean temperature of the cabin air space and to predict the temperatures of the roof, instrument panel, floor, windscreen and rear window during and following a transient simulation.

The cabin component specifically takes into account energy from the sun and the surrounding environment through the following inputs:

  • Angle of solar incidence and the effect of convective/conductive heat transfer through the vehicle roof, doors and other panels
  • Solar energy transmitted via convective and conductive heat transfer into the cabin through the windshield, sun roof, door glass and rear window
  • Heat transfer through the firewall to take into account heat from the powertrain systems

Within the cabin, heat transfer and their effects can be modelled for:

  • Driver and Passengers
  • Ventilation
  • Lumped Masses
  • Floor & Engine compartment

A unique feature of the Cabin Component is the Passenger Comfort Model designed to provide greater understanding of the thermal effects on the occupants of a vehicle and can be used to model:

  • Thermal resistance on passenger clothing
  • Thermal insulation of the passenger clothes
  • Passenger work per unit body area
  • Cabin mean temperature
  • Humidity
  • Cabin Air Velocity
Cabin Component