Alternativni materiali ploščnih prenosnikov toplote

Djurić, Branko (author), Golobič, Iztok (mentor)

Veliko razmerje med površino za prenos toplote na enoto volumna uvršča lotani ploščni prenosnik toplote med najučinkovitejše prenosnike toplote in so ključni element v ogrevalnih sistemih. Omenjeni ploščni prenosnik toplote se čedalje pogosteje uporablja tudi za neposredno ogrevanje pitne sanitarne vode. Zaradi tega smo zasnovali lotani ploščni prenosnik toplote brez uporabe lotne folije iz bakra, saj ta predstavlja slabšo korozijsko odpornost v stiku z grelnimi ploščami iz nerjavnega jekla. V ta namen smo preizkušali mehanske lastnosti prenosnika toplote, izdelanega z uporabo materialov izključno iz nerjavnega jekla. Izmerjene vrednosti smo uporabili za napoved trajnosti prenosnika toplote pri uporabi v resničnih okoliščinah. Poleg tega smo izdelali še ločeno merilno progo na kateri smo merili dinamiko odpiranja elektromagnetnih ventilov tople in hladne vode ter s pomočjo infrardeče kamere analizirali še nestacionarno temperaturno polje.

• Language: Slovenian
• Keywords: spajkani ploščni prenosnik toplote, korozija, mehanske lastnosti, dinamika odpiranja ventila, infrardeča termografija
• Work type: Bachelor thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2018
• PID: 20.500.12556/RUL-100769
• Publication date in RUL: 13.04.2018

Secondary language

• Language: English
• Title: Alternative materials in plate heat exchangers

Abstract

A major ratio between the heat transfer area and volume unit puts the soldered plate heat Exchanger among the most efficient heat exchangers and makes it the key element in the heating systems. The plate heat exchanger is also increasingly used for direct heating of drinking water. That is the main reason for our plate heat exchanger design, which does not contain copper soldering foil since it has a worse corrosion resistance compared to stainless steel heating plates. For this purpose, we tested mechanical properties of the heat exchanger made using exclusively stainless-steel materials. The measured values were used to predict the sustainability of the heat exchanger when used in real circumstances. In addition, we made measuring line on which we measured the dynamics of opening of electromagnetic valves and we analized transient temperature field on the heat exchanger plates with an infrared camera.

• Keywords: brazed plate heat exchanger, corrosion, mechanical properties, dynamics of valve opening, infrared thermography