Numerical Simulation Of Transients In Shell And
Tube Refrigerant Evaporator
Author(s)
B. Pavkovic, I. Vilicic, V. Medica
Abstract
A fully distributed dynamic numerical model of a shell and tube type refrigerant
evaporator, suitable for control and design purposes, is presented. A void fraction
model is used to account for the slip effect. The solution is achieved by the finite
volume method. Original software is developed for the model implementation on
computer. The thermal expansion valve model is added to the evaporator model
in order to simulate the evaporator's control loop. The spatial variations of
pressure, temperature, enthalpy, mass flow rate, density, vapor and liquid
velocities, void fraction and heat transfer coefficients are predicted through the
time for the evaporator. Results of numerical simulations are presented in a
graphical form. Measurements are performed on a 140 kW single stage
compression heat pump
Keywords
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