A numerical analysis for the design of a climatic chamber

In the present paper, a time-dependent numerical model for the design of a climatic chamber is been developed. The reference is made to the design of a chamber suitable for tracked and wheeled tractors, i.e. having measures 5x8x4 m³ (length x width x height). In order to support the theoretical predictions for the design, a numerical analysis is performed by employing Matlab-Simulink, a software package devoted to the simulation of the behavior of transient systems. Reference is made to simulate the air conditioning system of the tractor in both the two cases: the “winter case” and the “summer case”, as prescribed by the ISO 14269-2:1997 standard. In fact, in order to achieve the compulsory European type approval for tracked and wheeled agricultural tractors, the European Regulation 167/2013 has to be considered and the approval test for heating, cooling and conditioning systems requires experimental measures according to the European Delegated Regulation EU 2015/208. In detail, the heating and cooling devices have to be experimentally tested basing the measurements on the procedure foreseen in the ISO 14269-2:1997 standard, that provides a particular heavy weather conditions, both for summer and winter cases, and for long periods of time. For the mathematical model, the climatic chamber is represented by 5 blocks, and balance equations are written to simulate the systems in both climate conditions.