Comfort Study

passenger lounge

SUMMARY

Comfort study for the numerical validation of the air conditioning strategy. Through the simulation of fluids, the most extreme operating conditions have been reproduced, as well as the real validation tests. In this work the results are presented for the case of heating, where the external temperature is -10 ºC. The total heating power is 23.5 kW, and the flow rate is 2000 m3/h.

The visualization of the fluid field, in addition to the ability to measure and monitor any parameter of interest, allows us to ensure both the quality of the air and the stratification of temperatures according to the norm. It is also a calculation tool to be able to validate the power specified in the HVAC equipment, as well as the ducting system and the air outlets.

Play Video

3D MODEL

The study focuses on one of the central cars, where the hot air supply is carried out at ground level and the return of air to the HVAC equipment is conducted through various openings in the ceiling.

Average thickness and conductivity values ​​are available for each of the surfaces that delimit the interior volume of air; being 3.1 W/m2K the total average.

The ducting system has been studied independently, obtaining as a result the values ​​of flow rate and supply temperature for each of the air outlets. The average outlet temperature is 31 ºC and the flow rate, adjusted for pressure drops, is reduced to 1770 m3/h.

INTERIOR TEMPERATURE CONDITIONS

The objective of any comfort study is to ensure indoor air conditions in accordance with the norm, ensuring correct stratification and air quality. In this case, the measurements corresponding to the validation tests of the air conditioning system for the railway sector have also been reproduced.

Below are results that start from the thermal equilibrium condition. That is, a first stationary study has been carried out, around the equilibrium point, from which a time-dependent solution can be obtained. Also note that for the stationary solution averaged turbulence models (RANS) have been used, while for the transient case the turbulence has been calculated (LES).

AVERAGE STATIONARY SOLUTION

AVERAGE STATIONARY SOLUTION

TRANSITIONAL SOLUTION

MEASUREMENT POINTS

To ensure compliance with the standard, in addition to evaluating the interior conditions, it is necessary to obtain the specific values ​​of temperature and speed at the specified measurement points for the validation tests.

OTHER PROJECTS

Comfort Study

passenger lounge

Refrigeration system

Centum Communications Team

Micro-Heat Exchanger

With phase change particles

Internal Temperature Distribution

Centum Communications Team

Thermal Performance

Auxdrone team

air purifiers

Clean Air Team

UAV air intakes

Improved aerodynamic design

soot collector

Study of load losses

Collaborate with Symula

CFD Consulting

We offer you all our experience to help you in consulting projects through the use of CFD simulation.

Development of CFD models

We can adapt and automate the simulation process around your case study. It has your own simulation application.