THERMAL ANALYSIS OF HEAT TRANSFER IN CROSS-FLOW HEAT EXCHANGER

U ovom diplomskom radu provedena je termodinamička analiza izmjene topline u kriţnom pločastom rekuperatoru koji je sastavni dio sustava za rekuperaciju otpadne topline zraka u sustavima grijanja, hlaĎenja i ventilacije. Diplomski rad sastoji se od 9 poglavlja. U prvom dijelu diplomskog rada opisani su termodinamički oblici prijelaza topline, opis i podjela tehničkih izmjenjivača topline te je prikazan detaljan opis kriţnog pločastog rekuperatora s analitičkim proračunom. U drugom dijelu rada prikazuje se opis matematičkog modela i opis numeričkog rješavanja. Treći dio diplomskog rada prikazuje numeričku analizu i numeričke rezultate dobivene za zimske i ljetne uvjete te se numerički rezultati usporeĎuju s analitičkim rezultatima.In this thesis, a thermodynamic analysis of cross-flow plate heat exchanger was performed. Cross-flow plate heat exchanger is an integral part of the system for waste air recovery in heating, ventilating and air conditioning systems. This thesis consist of 9 chapters. In the first part of thesis thermodynamic types of heat transfer was presented as well as description and classification of heat exchangers. A detailed description of a cross-flow plate recuperator with analytical calculation is represented in first part ot the thesis. The second part of the thesis presents a description of the mathematical model and a description of the numerical solution. The third part of the thesis present the numerical analysis and numerical results obtained for winter and summer conditions, and the numerical results are compared with the analytical results