Passenger carriages heat insulation tool

Introduction. This is a description of a technology for assessing the quality of thermal insulation of passenger carriages bodies using the portable tool developed. The research focuses on  the thermal insulation characteristics of the walls  of passenger carriages bodies. Heat insulation is assessed by the reduced heat transfer coefficient which  increases during the service life driving up the costs of heating and air-conditioning the car interior. The thermal camera helps create a heat enginering data sheet of the car with  photos of the body parts with  poor thermal insulation. However, the overhaul of the car requires pinpointing these places by measuring locally the specific thermal resistance of the body walls. The research is intended to develop a method for determining the specific  thermal resistance of the walls of passenger carriages bodies in minimal time  using a portable tool.

Materials and methods. The research methods are  a combination of a physical  experiment on  a section of the wall of a passenger carriage body and on a model of such wall using the developed tool, as well as a digital experiment on their 3D-models. In particular, the tool calibration involved a finite element analysis  of an unsteady thermal process in a digital model of the tool and a 3D-model of the passenger carriage body using SolidWorks Simulation software.

Results. The authors prove that the portable tool can determine the local specific  heat resistance in a passenger carriage body wall in minimal time  of 40 minutes.

Discussion and conclusion. The  portable passenger carriage heat insulation tool can  be  used for  input and output control of thermal insulation of a passenger carriage during a major overhaul.

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