Projekt sustava grijanja, hlađenja i ventilacije slastičarnice

master's thesis

• Title (english): Design of heating, cooling and ventilation system for the pasrty shop
• Author: Viktorija Rudman
• Mentor: Igor Balen (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2022-12-16, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Process Energy Engineering

Abstract

U radu je izrađen projekt sustava grijanja, hlađenja i ventilacije prostora slastičarnice u centru Zagreba. Zgrada površine 85 m2 sastoji se od jedne etaže. Iznad cijele etaže prostire se spušteni strop čija visina, zbog kosog krova nagiba 2⁰, varira od 30 do 75 cm. Geometrija slastičarnice preuzeta je iz dobivenih arhitektonskih podloga. Prilikom odabira sustava težilo se zadovoljavanju standarda toplinske ugodnosti uz postizanje visoke energetske učinkovitosti i funkcionalnosti sustava. Grijanje i hlađenje slastičarnice predviđeno je u izvedbi sustava s dizalicom topline zrak – zrak s neposrednim protokom radne tvari. Kao ogrjevna tijela odabrane su kazetne jedinice stropne izvedbe. Prethodno odabiru sustava, napravljen je proračun toplinskih gubitaka i dobitaka koristeći računalni program IntegraCAD. Proračuni su provedeni sukladno normi HRN EN 12831 i smjernici VDI 2078. Ventilacijski sustav izveden je kao mehanička ventilacija s rekuperacijom topline. Ventilacijski zahtjevi definirani su korištenjem norme HRN EN 16798-1:2019. Na temelju dobivenih vrijednosti provedeno je dimenzioniranje kanala za distribuciju zraka i difuzora zraka koji su smješteni u spuštenom stropu. Odabir opreme i dimenzioniranje kanala ograničeni su svijetlom visinom spuštenog stropa. Pri definiranju pozicija kazetnih jedinica i difuzora zraka u obzir se uzima smještaj rasvjete i stropnih ukrasa. Rad uključuje tehničko ekonomsku usporedbu dva tehnička rješenja mehaničke ventilacije s rekuperacijom topline: samostalna jedinica i jedinica spojena na sustav grijanja i hlađenja. Samostalna jedinica za ventilaciju sadrži električni grijač za dogrijavanje zraka nakon rekuperacije topline na određenu temperaturu ubacivanja u sezoni grijanja. Spojena jedinica ima dodatni izmjenjivač topline radna tvar – zrak koji može grijati ili hladiti prostor zimi i ljeti. Rad obuhvaća tehničko – ekonomsku usporedbu ova dva sustava uzimajući u obzir cijene sustava i isporučenu električnu energiju. Sustav dizalice topline zrak – zrak u izvedbi multi – split sustava i samostalna ventilacijska jedinica predstavljaju bolje rješenje za grijanje, hlađenje i ventilaciju slastičarnice. Razlog tome su niži investicijski i pogonski troškovi uz postizanje zadovoljavajućih uvjeta toplinske ugodnosti.

Abstract (english)

A design of the heating, cooling and ventilation system of the pastry shop in the center of Zagreb was created in this thesis. The building with an area of 85 m2 consists of one floor. Above the entire floor is a suspended ceiling whose height, due to the roof with a 2⁰ slope, varies from 30 to 75 cm. The geometry of the pastry shop was obtained from the architectural design. When choosing the system, the aim was to meet the standards of thermal comfort while achieving high energy efficiency and functionality of the system. The heating and cooling of the pastry shop is provided in the form of a system with an air – air heat pump with direct flow of the working substance. Cassette ceiling units were chosen as heating elements. Before selecting the system, a calculation of heat losses and gains was made using the computer program IntegraCAD. Calculations were carried out in accordance with HRN EN 12831 standard and VDI 2078 guidelines. The ventilation system was designed as mechanical ventilation with heat recovery. Ventilation requirements are defined using the HRN EN 16798-1:2019 standard. On the basis of the obtained values, the dimensioning of air distribution channels and air diffusers, which are located in the suspended ceiling, was carried out. The selection of equipment and the dimensioning of the channels are limited by the clear height of the suspended ceiling. When defining the positions of cassette units and air diffusers, the placement of lighting and ceiling decorations is taken into account. The thesis includes a technical and economic comparison of two technical solutions of mechanical ventilation with heat recovery: an independent unit and a unit connected to the heating and cooling system. The independent ventilation unit contains an electric heater for reheating the air after heat recovery to a certain input temperature in the heating season. The connected unit has an additional heat exchanger working substance – air that can heat or cool the space in winter and summer. The thesis includes a technical-economic comparison of these two systems, taking into account system prices and delivered electricity. The multi-split system and the independent ventilation unit represent a better solution for heating, cooling and ventilation of the pastry shop. The reason for this is lower investment and operating costs while achieving satisfactory thermal comfort conditions.

• Keywords: grijanje; hlađenje; ventilacija; rekuperacija topline; multi – split; VRV sustav
• Keywords (english): heating; cooling; ventilation; heat recovery; multi – split; VRV system
• Language: croatian
• URN:NBN: urn:nbn:hr:235:719329
• 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: 2022-12-01 12:53:44