Abstract
The paper presents results from numerical modelling in ABAQUS of heat convection processes in the ducts of two-stage “water to air” heat exchanger, used as a heat consumer in reversible heat pump installation. A comparison between the values of heat convection coefficient has been done, as they have been determined on the basis of simulation results, and criterion equations. The heat convection processes have been modelled on the base of boundary conditions, determined by measuring of main parameters. The computing mesh has been verified on the basis of certain temperature values, by successively increasing the number of computing cells. The heat convection processes in the ducts of the heat exchanger have been simulated in “heating” and “cooling” modes of the installation. The study has been performed in laboratory conditions.
Highlights
In heat exchangers, the processes of heat transfer at forced convection are very common and are the subject of many studies and calculations
Simulation results for the temperature and the velocity distribution of the fluid flowing in the ducts of heat exchanger have been obtained
Heat convection coefficients have been determined on the basis of simulation of the heat transfer processes and on the basis of criterion equations
Summary
The processes of heat transfer at forced convection are very common and are the subject of many studies and calculations. An experimental study of a crosscurrent heat exchanger is presented in [1]. The research [2] focuses on the experimental determination of dependencies between certain criterion parameters, used for calculations of a heat exchanger with spirally finned tubes. In [3] is presented the methodology of experimental determination of heat convection coefficients and heat flows in a two-pipe heat exchanger. A tube-in-tube heat exchanger is studied in [4]. Investigation [5] presents calculation of thermal and hydraulic parameters of a heat exchanger with wavy finned surfaces. In [6] a methodology for investigation of the hydrodynamics of a floating head heat exchanger is presented. Article [7] focuses on an experimental study of a heat exchanger used in an air-conditioning system. The heat flows exchanged under operation of the installation in “heating” mode, have been calculated
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