Abstract
In this paper, development of the mathematical model for evaporator used in heat pump circuits is covered, with focus on air dehumidification application. Main target of this ad-hoc numerical model is to simulate heat and mass transfer in evaporator for prescribed inlet conditions and different geometrical parameters. Simplified 2D mathematical model is developed in MATLAB SW. Solvers for multiple heat and mass transfer problems - plate surface temperature, condensate film temperature, local heat and mass transfer coefficients, refrigerant temperature distribution, humid air enthalpy change are included as subprocedures of this model. An automatic procedure of data transfer is developed in order to use results of MATLAB model in more complex simulation within commercial CFD code. In the end, Proper Orthogonal Decomposition (POD) method is introduced and implemented into MATLAB model.
Highlights
An increasing effort to decrease the cost of any device requires more advanced methods for precise simulation and modeling of physical phenomena
Focus is on modeling heat and mass transfer inside evaporators for air dehumidification. Selected evaporator for this application is classified as a cross flow compact type heat exchanger - tube bundle with common fins, using R134a as a refrigerant
Implementation of Proper Orthogonal Decomposition (POD) and Radial Basis Functions (RBF) method into the mathematical model is covered more deeply in [2]
Summary
An increasing effort to decrease the cost of any device requires more advanced methods for precise simulation and modeling of physical phenomena. Focus is on modeling heat and mass transfer inside evaporators for air dehumidification. Selected evaporator for this application is classified as a cross flow compact type heat exchanger (or finned tube heat exchanger) - tube bundle (single tube with multiple passes) with common fins (every rectangular fin is in contact with all passes of the tube), using R134a as a refrigerant. An evaporator (“Inside Heat exchanger” in Fig. 1.) is placed in heat pump circuit that can be often found in many air dehumidification devices. Other parts of heat pump circuits are: condenser, compressor and capillary tube/reduction valve
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