Aerodinamska zasnova merilnika vlažnosti za uporabo v hladilnih stolpih

Fale, Matevž (author), Hočevar, Marko (co-mentor), Petkovšek, Martin (mentor)

Delo obravnava zasnovo in izdelavo merilnika vlažnosti, ki bo sposoben določevanja relativnih vlažnosti okoli 100 % s prisotnimi vodnimi kapljicami. Merilnik deluje kontinuirano tako, da mešanico zraka in vodnih kapljic vzorči izokinetično. Prisilni vlek skozi merilnik zagotavlja ventilator. Princip delovanja merilnika temelji na dvigu temperature vzorčenega zraka, s tem mu znižamo relativno vlažnost. Izločanje in uparjanje kapljic zagotavljajo stene ciklona, ki so ogrevane. Tako imamo na izstopu le zrak z relativno vlažnostjo okoli 80 %, takšno relativno vlažnost lahko določimo s komercialno dostopnim merilnikom vlažnosti. V delu je opisana zasnova in sestava merilne proge za določitev tlačnega padca na ciklonu in določitev napajalne napetosti ventilatorja pri posameznih pretokih zraka. Pokazano je, kako različni parametri vplivajo na tlačni padec v ciklonu in njegovo učinkovitost.

• Language: Slovenian
• Keywords: ciklonski ločevalnik, karakteristika ciklona, tlačni padec, volumski pretok zraka, absolutna vlažnost, relativna vlažnost
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [M. Fale]
• Year: 2019
• Number of pages: XXII, 60 str.
• PID: 20.500.12556/RUL-108250
• UDC: 697.93:681.2(043.2)
• COBISS.SI-ID: 16676891
• Publication date in RUL: 22.06.2019

Secondary language

• Language: English
• Title: The aerodynamic design of the humidity meter for use in cooling towers

Abstract

The thesis presents the design and production of a humidity meter capable of determining relative humidity around 100% with the presence of water droplets. The meter operates continuously with isokinetic sampling of a mixture of air and water droplets. Forced draft through the meter is produced by the fan. The mechanical principle is based on the rise of temperature of the sampled air which lowers the relative humidity. The release and evaporation of the water droplets occurs because of the heated walls of the cyclones. We thus have relative humidity around 80% in the outlet air. We determine this relative humidity with a commercially accessible humidity meter. The thesis describes the design and composition of the measurement setup which determines the pressure drop on the cyclone and determines the fan feed voltage for individual air flows. The way how different parameters affect the pressure drop in the cyclone and its effectiveness is also shown in the thesis.

• Keywords: cyclone separator, cyclone characteristics, pressure drop, volume gas flow, absolute humidity, relative humidity