Mobilni uređaj za sprječavanje mraza

master's thesis

• Title (english): Mobile frost protection device
• Author: Ante Bračić
• Mentor: Dragan Žeželj (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2019-12-06, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; General Mechanical Engineering (Construction)

Abstract

Mraz je česta oborina kako u svijetu tako i na mediteranskom području i kao takav predstavlja neposrednu opasnost za cjelokupnu hortikulturu. Tokom povijesti razvijale su se razne metode zaštite i prevencije od mraza, no budući da u novije vrijeme poljoprivreda ima znatno veći ekonomski utjecaj, pojavila se potreba za alternativnim metodama zaštite.
Kako se pojava mraza nerijetko ne može lokalno precizno predvidjeti javlja se potreba za prijenosnim uređajima za sprječavanje mraza. Jedna od metoda sprječavanja mraza jest lokalno zagrijavanje zraka, pa tako postoje razni mehanizmi zagrijavanja poput plamenih grijalica, dimnih zavjesa, upuhivanja toplog zraka i sl. Prilikom pojave mraza javlja se inverzijski sloj, odnosno topliji sloj zraka nekoliko metara iznad tla. Stoga su se pojavili ventilatori koji miješaju topliji zrak inverzijskog sloja s prizemnim zrakom.
U sklopu ovog rada obradit će se tema mraza i njegovog utjecaja na pojedine poljoprivredne kulture, načini zaštite i prevencije od mraza, te će se prikazati proces analize tržišta, koncipiranja, te konstrukcijske razrade uređaja.

Abstract (english)

Frost is a frequent precipitation both in the world and in the Mediterranean area and as such poses an imminent danger to the entire horticulture. Throughout history, various methods of protection and prevention of frost have been developed, but since more recently agriculture has significantly greater economic impact, the need for alternative methods of protection has emerged.
Since the occurrence of frost often can't be accurately predicted locally, there is a need for portable frost prevention devices. One method of preventing frost is the local air heating, so there are various heating mechanisms such as flame heaters, smoke curtains, hot air blowing, etc. When frost occurs, an inverse layer or warmer layer few meters above ground appears. This led to the development of ventilators that mix the warmer air of the inverse layer with ground air.
As part of this work, there will be presented the theme of frost and its influence on individual agricultural cultures, methods of protection and prevention of frost, the research process, the product conception and the design of the device.

• Keywords: prijenosni uređaj; mraz; zaštita od mraza; ventilator
• Keywords (english): portable device; frost; frost protection; fan
• Language: croatian
• URN:NBN: urn:nbn:hr:235:207751
• 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: 2019-11-28 11:27:17