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Determination of microorganisms in the air of food premises
Krýzová, Andrea ; Popelářová, Eva (advisor) ; Salmonová, Hana (referee)
Microorganisms are able to spoil foods with their presence in food plants, therefore,
there is necessary to perform the monitoring of microbial air quality. The aim of this Bachelor
thesis was to confirm that the air quality in the food plant is better than in the current
environment. Microbial cleanliness should be at the highest level, especially in places where
is risk of contamination of the products.
Air composition was observed in microbrewery by Czech University of Life Sciences
Prague. It was evaluated by the total number of microorganisms and number of moulds.
In the case of moulds there was also determined gender representation. Samples of air with
present microorganisms were collected from five parts of the brewery, using active air intake
with airsampler MAS 100 Eco (Merck, Germany). It was a sanitation station, lager beer cellar,
section wort cooling, boiling room and to compare the hall. Air analysis was performed twice
with intervals of two months.
According to the findings, in sanitation station can be found higher total number
of microorganisms than in the hall. However, this increased incidence could be related
to microbial penetration from the outside environment due to the use of makeshift door
leading into the room. In other parts of the operation has already been confirmed less than
the total number of microorganisms in the hall. Enumeration of molds revealed that the entire
operation were lower than the concentrations of these microbes in the corridor.
Dangerous place in the brewery in terms of contamination of the product is lager
cellar, because here with maturation occurs also his tapping. Here upheld a lower incidence
of microorganisms than in the current environment, and as other parts of the plant do not pose
a risk of product degradation, the objective has been achieved.
Of the native representation of mould in the air microbrewery it shows that the most
abundant mould genus was Cladosporium and Penicillium followed. Cladosporium occupied
on average 54,8 % of the total number of mould. At lower concentrations, there have been
also genera Alternaria and Aspergillus.
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Ventilation Control Unit with Radio Time Synchronization
Barták, Jiří ; Šimek, Václav (referee) ; Tříska, Vít (advisor)
Project's primary objective was to create ventialtion control unit, which synchronizes its time through radio signal. Delivering power into fans is based on dew points calculated from data obtained on both sides of circumferential wall. The most important parts of this unit are microcontroller MC9S08DZ60, sensor SHT11 and DCF77 receiver. There is SD card socket on the inner printed circuit board for data recording purposes. I am working with the card on file system layer. The control unit uses USB socked as well to be able to communicate with PC. I have decomposed firmware of control unit into small modules at the start of development. Those modules are: MCU to MCU communication, USB communication, measuring temperature and relative humidity using SHT11 and extracting time information from DCF77 signal, all written in C. After these modules were tested, i have put them together. I have also written a PC application in Java. It is used to communicate with control unit and to process recorded data. Benefits of the control unit cannot be evaluated without long-term observation.
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Indoor environment in assembly halls
Janeček, Tomáš ; Počinková, Marcela (referee) ; Rubinová, Olga (advisor)
This thesis is concerned with the creation of indoor air and requirements on it, describes the components of the internal environment, in particular the formation of carbon dioxide and its properties. It also deals with the experimental measurement of the concentration of carbon dioxide in the classrooms and the subsequent evaluation according to the valid legal regulations. In the last part, I dealt with a proposal for the creation of internal systems that are specified by the building.
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Data concentrator for data acquisition and wireless modules
Palacký, Tomáš ; Pásek, Jan (referee) ; Fiedler, Petr (advisor)
This master’s thesis deals with design and construction of a system for repote measurement of air quality in buildings. The first section provides a selection and analysis of used hardware and software components: minicomputer Raspberry Pi, STM32F401 microcontroller, communication module XBee-Pro, CO2 sensor and also communication interfaces IC and USART. The next section includes a design of electrical wiring, circuit board, configuration of the wireless modules and a software implementation for microcontroller and the concentrator.
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Automatic system of the central air circulation
Nedoma, Pravoslav ; Pavlík, Michal (referee) ; Havlíček, Tomáš (advisor)
Project is target on design and realisation of device for control of central ventilation and air distribution. Control unit evaluates air quality in habitable rooms and assure automatic air change. System is driven by microprocessors and uses electronically controlled valves and ventilator regulation. Project is focused on evaluation of carbon dioxide concentration and detection of fire in rooms. Control unit cooperate and communicate via data bus with already designated control unit of hot water heating. Whole unit can be easing connected to the PC using ethernet.
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