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Using Low Temperature Energy Sources for Ventilation Systems in Residential Buildings
Adam, Pavel ; Košičanová,, Danica (referee) ; Horák, Petr (referee) ; Kabrhel,, Michal (referee) ; Hirš, Jiří (advisor)
The theoretical part deals with three “ventilation systems” (VS). The first VS uses a ground/well temperature potential as a energy source for preheating or cooling fresh ventilation air. It was found out that energy savings can be achieved. In the winter, when the air flow volume was considered 150 m3/hr and ground temperature 4 and 8 ° C, the energy savings are in the range of 227-359 kWh. The electricity increase is 6 kWh of energy. In the summer, the energy savings are 17 to 38 kWh, with the electricity increase 8 kWh of energy. The second VS, i.e. system combining ventilation a solar systems, the calculation was carried out in TRNSYS computer program for two objects - a “low-energy house” (LEH) and “two-floor house” (TFH) - and 6 different solar systems modifications. The energy gains at the LEH for the 3 solar modif. are 49, 59 and 46 kWh per year (yearly consumption for heating is 2622 kWh). The energy gains at the TFH for the 3 solar modif. are 86, 134 and 129 kWh (yearly consumption for the heating is 8988 kWh). The third VS is a residential VS with liquid circuit with two compact “heat exchangers” (HE) at the inlet and outlet air. The results shows (compared to VS without heat recovery) that with the air flow volume 150 m3/h the energy savings in the winter are 1761-3148 kWh (16-hour and 24-hour operation mode). The electr. increase is 173 to 262 kWh of energy. In the exp. research the measuring section for the HE measuring was built. Then the conventional materials HE was measured. Is was found out that the selected HE is suitable for installation of the theoretically proposed systems. Its efficiency is in the range 58 - 82 % (with the air flow volume 570-55 m3/h). Measuring section was optimized and measured various hollow fibre HEs. Their efficiency are in the range 38-63 % (with the air flow volume 300-900 m3/h). Results of CO2 measurements shows that CO2 concentration is close to the value of 5000 ppm. It is much higher than max. allowed value 1200
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Ventilation of nearly Zero Energy Building
Frčka, Lukáš ; Horák, Petr (referee) ; Rubinová, Olga (advisor)
This diploma thesis is focused on nearly zero energy buildings, which are a mandatory part of construction of the buildings in Czech republic after 2020. It also deals with HVAC and its design as part of these buildings. The theoretical part deals with legal and technical regulations and possible savings in HVAC systems. The computational part is focused on two solution of HVAC systems in given object. The project part is about the given object, which is otevřená zahrada Brno. This building was founded by Nadace Partnerství s.r.o.. This third part of diploma thesis deals with the quality of indoor microclimate and evaluation of the heat recovery system effiency, which is applied in local HVAC unit.
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Analysis of boundary conditions of ground heat exchangers
Floreková, Skarleta ; Horák, Petr (referee) ; Hirš, Jiří (advisor)
Diplomová práca,, ,,Analysis of boundary conditions of ground heat exchangers,, je primárne zameraná na analýzu okrajových podmienok a hlavných faktorov vplývajúcich na spoľahlivý návrh a prestup tepla plošného zemného výmenníka v oblasti geotermálnych aktivít na kúpeľnom ostrove v Piešťanoch. Posúdenie možných vplyvov na životné prostredie, ako je napríklad vznik tepelných zmien v dôsledku extrakcie tepla vrátane zamŕzania pôdy v okolí potrubia a potenciálneho znečistenia podzemných vôd je taktiež rozoberané. Súčasťou tejto záverečnej práce boli spracované tri numerické analýzy metódou konečných prvkov pomocou softvéru COMSOL Multiphysics 5.6., ktoré sa môžu vyskytnúť v tejto konkrétnej oblasti. Prvá numerická analýza je podrobená štúdii dynamických procesov plošného zemného výmenníka tepla a zeminy nasýtenou vodou pri konštantnej teplotnej okrajovej podmienke pôdy. Dynamický proces zemného výmenníka tepla a nasýteného podložia pri nestálej teplotnej okrajovej podmienke je skúmaný v druhej numerickej analýze. Posledná analýza je vyhotovená na posúdenie prevádzky plošného zemného výmenníka tepla s možnosťou prúdenia podzemnej vody v rovnakej vrstve. Vďaka týmto numerickým štúdiám a výsledkom dynamických tepelných modelov, každá prípadová štúdia obsahuje rozloženie teplôt v zemine, výstupné teploty z výmenníka a vlastný čiastočný záver.
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Nearly-zero energy Kindergarten
Ryšavý, Daniel ; Vyhlídalová, Karolína (referee) ; Horák, Petr (advisor)
The master project is consists of three parts. The aim of the first and second part is to design kindergarten building, its technical equipment and management systems. The third part deals with energy, financial and environmental comparison of different wall construction composition. The kindergarten is single-storey building without basement and is located in Náchod, Czech Republic. Building is based on strip footing and structural system is masonry wall system with flat roof. Material of both load-bearing and non-bearing walls are sand-lime blocks. External walls are insulated by external thermal insulation composite system. Vertical structures are designed from prestressed Spiroll concrete floor slabs. The roof is designed as a warm flat half-intensive green roof. The building site contains also outdoor parking lot and a garden with a playground and a pond.
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Ventilation of wooden apartment building
Fečer, Tomáš ; Horák, Petr (referee) ; Adam, Pavel (advisor)
This bachelor thesis is focused on design of ventilating and air conditioning of wooden apartment building. In theorethical part are discussed types of wooden constructions, then in the next part there is focus on inner elements such as: injurants made from outer and inner environment, calculation of room's thermal load, types of air conditionings, ways of heat obtaining and ending parts of ventilating and air conditioning systems where these elements are influencing a state of internal microclimate of buildings. Practical part is focused on a design of the of ventilating and air conditioning. It consist of a building dissection on functional parts, thermal balances, air flows and an air distribution into individual rooms, a noise absorption and a conduit dimensioning of ventilating and air conditioning. Air flows are designed to meet the criteria of active and recommended standarts of ČR. Air conditioning of the wooden apartment is designed as isobaric mechanical
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Energy Audit of Multipurpose Building
Čajčíková, Jolana ; Počinková, Marcela (referee) ; Horák, Petr (advisor)
The theme of this diploma thesis are the issue of energy evaluation of buildings and the reduction of energy consumption in the Czech legal system in the theoretical part, an analysis of energy consumption of the judged building in an old and new state in the calculation part and an energy audit of the main building of SRC Lihovar in Třemošnice according to Decree no. 480/2012 Coll. The three-storey main building of sports and rehabilitation center is located on the southern edge of city Třemošnice and it used to be a distillery until it has been renovated in 2013. There is a restaurant with a bowling room, hotel with two conference lounges, wellness, fitness and a swimming pool. The heat source for this building are two gas boilers, three heat pumps and solar collector array. There is partly forced and partly natural ventilation installed in the building.
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Ventilation for nursery
Grmolcová, Eliška ; Horák, Petr (referee) ; Rubinová, Olga (advisor)
In this thesis, I worked on a project which suggests a solution for air-conditioning in nursery school together with kitchen. The facility provides a supply of adjusted air and leads away depreciated air. Moreover, I designed the cooling system in the premises of the nursery school in summer months. The designed facilities will provide a needed microclimate in this edifice.
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