Parametric Analysis of a Falling Film Pillow Plate Evaporator

Student thesis: Master thesis (including HD thesis)

  • Lasse Olsen
4. term, Energy Engineering, Master (Master Programme)
The purpose of this project was to create a para-metric model, which can analyse the heat trans-fer for a flooded falling film pillow plate evapo-rator. The first step of modelling the heat trans-fer was to determine the thermal resistance.This was done by modelling the three typesof heat transfer and accounting for whetherdry out happens during the evaporation pro-cess and how the boiling heat transfer changesas a function of the quality of the refriger-ant. This was then implemented using the cellmethod to model the heat exchanger. To val-idate the model it was compared to data pro-vided by ATHCO, a company that produces pil-low plates. Here it showed to be able to predictthe overall heat transfer coefficient with an er-ror margin of 14% mostly under predicting theheat transfer. This is an acceptable accuracy, sothere was made a parametric analysis. Here theresults showed that the best method for improv-ing the heat transfer is to either increase the areaby increasing the height, increase the tempera-ture difference by increasing the inlet tempera-ture or flow rate of the falling film or increasethe flow rates of either the refrigerant or thefalling film. Especially increasing the refriger-ant flow rate is beneficial as this reduces the riskof dry out happening.
SpecialisationThermal Energy and Process Engineering
Publication date27 May 2021
Number of pages101
External collaboratorATHCO Enginering
Jeppe Nielsen
ID: 413014784