Analiza učinkovitosti rashladnika kapljevine s naplavljenim škropnim isparivačem

master's thesis

• Title (english): Energy analysis of chiller with flooded spray evaporator
• Author: Domagoj Valenčak
• Mentor: Vladimir Soldo (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2022-07-20, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Process Energy Engineering

Abstract

U ovom radu provedena je usporedna analiza energetske učinkovitosti rashladnika kapljevine s naplavljenim škropnim isparivačem u odnosu na rashladnik kapljevine sa suhim tipom isparivača konstrukcijske izvedbe „cijevi i plašt“. Kroz oba isparivača kao sekundarni radni medij koji se hladi struji voda, a radna tvar je R290. Kod škropnog isparivača radna tvar se raspršuje preko cijevi te isparava u plaštu, a kod suhog tipa isparivača radna tvar isparava u cijevi te postaje pregrijana. Za potrebe analize, istraživanje je provedeno na istoj ispitnoj stanici, koristeći isti kompresor, kondenzator, ekspanzijski ventil te druge pomoćne komponente sustava kako bi se usporedili rezultati rada s dva različita tipa isparivača. Rashladni učin je promjenjiv, ovisno o potrebama i varira u vrijednosti od 170 do 400 kW, a temperaturni režim hlađene vode iznosi 12/7 °C.

U radu je proveden termodinamički proračun naplavljenog škropnog isparivača te prikazana shema spajanja i automatske regulacije sustava i dispozicijski crtež rashladnog agregata.

Abstract (english)

In this work was conducted a comparative analysis of the energy efficiency of a liquid chiller(liquid chilling packages) with a flooded spray evaporator in relation to a liquid chiller with a dry type of evaporator of the "shell and tube"construction. Through both evaporators flows a water as a secondary working medium, that is cooled, and the working substance is R290. With a spray evaporator, the working substance is sprayed over the tube and evaporates in the jacket, while with a dry type of evaporator, the working substance evaporates in the tube and becomes overheated. For analysis purposes, the research was carried out at the same test station, using the same compressor, condenser, expansion valve and other auxiliary system components in order to compare the results of work with two different types of evaporators. The cooling effect is variable, depending on needs and varies in values from 170 to 400 kW, and the temperature regime of water is 12/7 °C.

In the paper was executed the thermodynamic calculation of the flooded spray evaporator and were presented the merging scheme and automatic regulation of the system and the layout drawing of the cooling unit

• Keywords: Rashladnik kapljevine; energetska analiza; naplavljeni škropni isparivač; radna tvar
• Keywords (english): Liquid chiller (liquid chilling packages); energy analysis; flooded spray evaporator; working substanc
• Language: croatian
• URN:NBN: urn:nbn:hr:235:482049
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-07-18 11:06:44