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Thermodynamic and heat transfer mathematical model of an experimental refrigeration device with the focus on design of vertically oriented helical coil evaporator flooded in the water

Refrigeration cycle system modelling applied on the experimental unit with the goal to predict the geometry of the helical coil evaporator flooded in the water is presented in the paper. Design of the experimental unit is based on the commercial available scroll compressor and air cooled condenser. In order to perform the thermodynamic conditions of refrigeration cycle and heat transfer process in the evaporator the simulation model is developed. The model takes into account the specific data, dimensions and characteristics of the main components. Evaporation process, observed into three parts, and condensation process are described with appropriate heat transfer correlations. Model of compression process is given as approximation where the validation of the model is done based on the manufacturer data of the compressor. Results show relations between thermal resistance and geometrical quantities of evaporator. Influences on the energy performance and system redesign for the different working conditions and different temperatures of the water around the evaporator are also presented.

Refrigeration device; Evaporation process; System design; Thermal resistance

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