Projektiranje sustava za odvlaživanje zraka u stakleniku

undergraduate thesis

• Title (english): Design of greenhouse dehumidification system
• Author: Jakov Bilić
• Mentor: Nenad Ferdelji (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; (Department of Thermodynamics, Thermal and Process Engineering); Zagreb
• Defense date and country: 2025-02-10, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

Problemu prekomjerne vlage u staklenicima do sada se najčešće pristupalo otvaranjem prozora i grijanjem vanjskog zraka. Međutim, ova metoda je energetski vrlo intenzivna i nije uvijek učinkovita, posebno u situacijama kada je vanjski zrak već zasićen vlagom. Takvi slučajevi najčešće se javljaju u proljeće i ranu jesen, kada ventilacija i grijanje ne mogu učinkovito smanjiti vlagu unutar staklenika. U tim periodima biljke su izložene dugotrajnim uvjetima visoke vlage, što negativno utječe na njihov rast i zdravlje. Povećava se rizik od razvoja gljivičnih oboljenja, smanjuje kvaliteta usjeva te dolazi do gubitka prinosa. Alternativa navedenom su monoblok klima jedinice koje kondenziraju vlagu i dogrijavaju zrak, no vrlo visoki investicijski troškovi čine ovu tehnologiju neodrživom za većinu kultura uzgajanih u staklenicima. Ovaj rad opisuje koncept uređaja s tekućim desikantom koji može u potpunosti zamijeniti klasične metode grijanja i ventilacije, osiguravajući učinkovito odvlaživanje tijekom cijele godine uz znatno niže investicijske troškove od monoblok jedinica. Predloženi sustav također je energetski učinkovitiji u usporedbi s postojećim tehnologijama. Opis koncepta slijedi dimenzioniranje najbitnijih komponenti i izvedba prototipa. Rezultati dobivenim preliminarnim mjerenjima potvrđuju ispravnost odabranih modela pri dimenzioniranju i opravdavaju nastavak istraživanja i razvoja ovog projekta.

Abstract (english)

The problem of excessive humidity in greenhouses has so far been most often addressed by opening windows and heating the outside air. However, this method is very energy-intensive and not always effective, especially in situations where the outside air is already saturated with moisture. Such cases most often occur in spring and early autumn, when ventilation and heating cannot effectively reduce the humidity inside the greenhouse. During these periods, plants are exposed to long-term conditions of high humidity, which negatively affects their growth and health. The risk of developing fungal diseases increases, crop quality decreases and yield losses occur. An alternative to the above are monoblock air conditioning units that condense moisture and reheat the air, but very high investment costs make this technology unviable for most crops grown in greenhouses. This paper describes the concept of a device with a liquid desiccant that can completely replace classic heating and ventilation methods, ensuring effective dehumidification throughout the year with significantly lower investment costs than monoblock units. The proposed system is also more energy efficient compared to existing technologies. The description of the concept is followed by the sizing of the key components and the development of a prototype. The results obtained from preliminary measurements confirm the correctness of the selected models for sizing and justify the continuation of research and development of this project.

• Keywords: staklenik; odvlaživanje; monoblok; tekući desikant
• Keywords (english): greenhouse; dehumidifying; monoblock; liquid desiccant
• Language: croatian
• URN:NBN: urn:nbn:hr:235:906760
• Study programme: Title: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering; Course: Process and Energy Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Embargoed access; Embargo expiration date: 2027-02-10
• Created on: 2025-02-11 07:12:40