Talab kashash Murtazaa; Ali Dawood salman
Abstract
Abstract In this present work computational models are fabricated , these model depended on the elements of longitudinal finned tube to design the roll bound evaporator . The computational ...
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Abstract In this present work computational models are fabricated , these model depended on the elements of longitudinal finned tube to design the roll bound evaporator . The computational models consist of empirical and mathematical correlation beside values of each design variables and variable boundaries that is obtained from experimental tests . The design variables values present heat transfer coefficient of refrigerants , pressure drop , pressure gain through the multi pass channel , oil effect , shape and cross section area as a ratio to it's boundary , dimensions of longitudinal fin where the variable boundaries present the experimental values for the evaporator's surface temperature and cooling space temperature . The computational models depend on numerical iterative method to estimate the length of element between two nods ( step ) , where these estimation depend on heat balance . From the comparison between simulation program result with two roll bond evaporators that was manufactured by professional company it can be seen that computational result for 117 watt evaporator capacity are accurate within ( 7.3 % ) in length and ( 1.5 % ) in refrigeration capacity , while the comparison with 152 watt evaporator capacity it can be seen that computational result are accurate within ( 1.4 % ) in length and ( 4.5 % ) in refrigeration capacity .
