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Posouzení účinnosti sanitace chladicích zařízení v různých provozech
DROZDOVÁ, Aneta
The adequate level of hygiene of refrigeration equipment is one of important factors that affects the maintenance of quality and safety of stored food. The aim of this bachelor thesis was to assess the efficiency of sanitation of selected refrigeration equipment in the household (n=3) and in gastronomic establishments (n=3). Microbiological analysis enabled the determination: total number of mesophilic, coliform and psychrotrophic microorganisms, and also yeasts and fungi.
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System for Recording and Reporting Fault States of Cooling Devices
Jašek, Filip ; Vašíček, Zdeněk (referee) ; Šimek, Václav (advisor)
The thesis deals with the design and creation of a system for recording and reporting error states of cooling devices on the principle of a compressor heat pump. An important element of the concept of the entire monitoring system is a built-in platform based on the ESP32 microcontroller for evaluating data measured by sensors. Another key element is the communication module, which sends measured data via GPRS in the form of MQTT messages to the service web application. The application receives, evaluates and records measured data. Subsequently are measured data and evaluated error states presented to the user in the form of tables and interactive graphs.
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Refrigeration device for home brewery
Křivánek, František ; Tuhovčák, Ján (referee) ; Hejčík, Jiří (advisor)
This bachelor thesis deals with the issue of cooling processes and the design of cooling equipment for home brewery. The first part outlines an introduction to this issue, followed by the design of the cooling circuit and a description of its individual parts. Attached is the cost estimate for this device.
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Aplikované aspekty kryokonzervace rybích spermií
HOROKHOVATSKYI, Yevhen
Fish sperm cryopreservation becomes highly attractive due to increasing number of potential applications and it has been considerably developed over the past decades. Cryopreservation of fish sperm is expected to improve the broodstock management in hatcheries, simplify hybridization and selective breeding, and serve as a useful tool for biodiversity and conservation of endangered species programs. Nevertheless, its status nowadays is highly contentious due to absence of specific techniques and standardization in the developed protocols. Moreover, the heterogeneity of cryoresistance in sperm of some fish individuals and, strong impairment of the sperm quality and survival after cryopreservation, to date, present some challenges inhibiting wide applicability of this approach. Therefore, a better understanding of the mechanisms of spermatozoa cryo-injuries and the development of new and more effective methods for cryopreservation of fish sperm are of primary importance. In the current work, the causes of individual variability in sperm cryoresistance, influence of cryopreservation process on sperm quality parameters regarding application of uncontrolled cooling devices were investigated. One of the study outputs is the founding the possible causes of sperm cryoresistance heterogeneity in common carp (Cyprinus carpio) males. As a result, a negative correlation between changes in the contents of major lipid classes and sperm motility after cryopreservation was found. In particular, the increased level of phospholipid, cholesterol and free fatty acid in samples with low post-thaw motility percentage were observed and related to decrease in sperm cryoresistance in common carp sperm. In the investigation of the consequence of the application of uncontrolled cooling devices on post-thaw sperm parameters of sterlet sperm, it has been shown that sterlet sperm could be cryopreserved by both Styrofoam box and dry shipper devices studied. However, due to inability to precisely control cooling process in these devices, the cooling conditions can be changed by varying straw number during freezing in Styrofoam box or by straw position during freezing in dry shipper. As a consequence, these changes shift the optimal freezing rates needed for successful sturgeon sperm cryopreservation resulting in decrease in post-thaw sperm motility and fertilization ability. These results suggest the way of standardization of fish sperm cryopreservation protocols by selecting appropriate straw number or straws position when uncontrolled cooling devices are used. Finally, to explore the cryopreservation effects on fish spermatozoa, the Percoll density gradient centrifugation technique was elaborated and applied for the first time to sterlet (Acipenser ruthenus) sperm. That technique allows to select and analyse only the sperm population that survived cryopreservation procedure and saved high motility parameters. It was found that this spermatozoa subpopulation possesses minimal changes in protein profile in comparison to native sperm. Moreover, the differences in many proteins which were found in sperm suspension after cryopreservation without separation is related to the presence of non-viable and sperm wreckage subpopulations in the frozen-thawed sperm suspension. Collectively, all of these detected changes in sperm motility parameters, viability, and protein profiles of viable spermatozoa after freeze-thaw process suggest some explanations for the mechanism responsible for cryodamage of sperm and provides the background for further development of an efficient cryopreservation protocols. However, it should be also further studied if the Percoll separation technique could serve as a useful tool for both better understanding of non-lethal sperm cryodamages and improvement of assisted reproduction practice in sturgeon species.
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Design of an HVAC system in a retrofitted family house
Vacenovský, Jan ; Lízal, František (referee) ; Charvát, Pavel (advisor)
This work is devoted to the design of a microclimate facility in a family house. The first part contains analysis of thermal losses before and after using thermal insulation. Based on this analysis, a heating system is proposed, including the necessary technical calculations for the operation of the system. As a heat source, a condensing boiler is selected. At the next point, the thesis focuses on the calculation of the heat gains in selected rooms in order to design a cooling device. A multisplit system is selected for cooling the rooms. In the next part the thesis deals with the design of forced ventilation of selected rooms. The ventilation system provides the necessary air exchange and covers heat losses through ventilation. At the end of the thesis is outlined the concept of regulation of individual systems and also the requirements for individual professions are described.
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Cooling unit for home brewery
Straka, Miroslav ; Tuhovčák, Ján (referee) ; Hejčík, Jiří (advisor)
This diploma thesis deals with producing and using low temperatures in home brewing processes. The introductory part describes technological process of brewing beer, followed by a design of a primary fermentation vessel and next an aging vessel. In the next step a suitable wort chiller is designed. All the equipment is designed to be able to run on batteries or a solar photovoltaic panel.
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Optimalizace vybraných parametrů kompresorového chlazení v potravinářském provozu
Černý, Lukáš
This thesis focuses on the topic of food chilled compressor-lation. The work is divided into two parts. The first part deals with the theory of compressor cooling in the food service related regulations and standards. The second part focuses on the analysis of current cooling in selected food operation and design optimization of individual parameters. Part of the second part is also an economic evaluation optimization.
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Water chiller for ceiling cooling system
Havlíček, Jan ; Chovancová, Michaela (referee) ; Hejčík, Jiří (advisor)
The topic of this diploma thesis is to design water chiller for ceiling cooling system. The thesis is divided into four main parts. The first part deals with the theoretical description of emitting cooling systems. The following part focuses on the theory of refrigerating systems and describes especially the thermal cycle and refrigerants which are used in cooling systems. In the third chapter refrigerating equipment are described. Compressor, heat exchangers and expansion valves belong to the main parts of refrigerating systems. The final chapter is devoted to the draft and selection of components of the refrigerating system.
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Low-temperature biogas purification
Hřebíček, Martin ; Fiedler, Jan (referee) ; Pospíšil, Jiří (advisor)
The aim of this thesis is the issue of low-temperature cleaning of biogas. He briefly acquaint the reader with the technology of production of biogas and its possible use. Provide requirements for low-temperature treatment and purification of biogas to the needs of downstream equipment. Provide an overview of the possibilities of suitable production systems applicable cold. Develop your own design facilities for low-temperature treatment of biogas
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