Thermal performance of a prototype plate heat exchanger with minichannels under boiling conditions

7th European Thermal-Sciences Conference

Wajs, J.^1 ; Mikielewicz, D.^1 ; Fornalik-Wajs, E.^2

Gdansk University of Technology, Department of Energy and Industrial Apparatus, Narutowicza 11/12, Gdansk

80-233, Poland^1

AGH University of Science and Technology, Department of Fundamental Research in Energy Engineering, Al. Mickiewicza 30, Krakow

30-059, Poland^2

关键词: Boiling conditions;    Compact heat exchanger;    Experimental analysis;    Future applications;    High heat flux;    Overall heat transfer coefficient;    Plate heat exchangers;    Thermal Performance;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/745/3/032063/pdf
DOI  :  10.1088/1742-6596/745/3/032063

来源: IOP

【 摘 要 】

To solve the problem and to meet the requirements of customers in the field of high heat fluxes transfer in compact units, a new design of plate heat exchanger with minichannels (minichannels PHE) was proposed. The aim was to construct a compact heat exchanger of high effectiveness for the purpose of household cogeneration ORC system. In this paper the experimental analysis of an assembled prototype of such compact heat exchanger was described. The attention was paid to its thermal performance and the heat transfer coefficients under the boiling conditions. Water and ethanol were chosen as working fluids. The maximal value of transferred heat flux was about 84 kW/m2, while of the overall heat transfer coefficient was about 4000 W/(m2K). Estimated values of heat transfer coefficient on the ethanol (boiling) side reached the level of 7500 W/(m2K). The results are promising in the light of future applications, for example in cogeneration ORC systems, however further systematic investigations are necessary.