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Indirect air heating
Beneš, Josef ; Adam, Pavel (referee) ; Počinková, Marcela (advisor)
The master Thesis deals with indirect air heating in air handling units. In the theoretical part of the thesis the categories of heat exchangers are defined according to their positioning in ventilation system, used material and type of heat transfer fluid. To the issue of calculating heat exchanges through heat exchangers and description of different kinds of regulation of primary heat transfer fluid is dedicated a separate chapter. The experimental part of the thesis deals with determining performance of current air heat exchanger at set thermal gradient with various heat transfer fluids. In the calculating part of the Thesis, based on measured values, are suggested two possible solutions for use of technological waste heat. Final evaluation of particular solutions was based on the criterion of efficiency usage and implementation investment costs.
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The application of artificial substrates for quantitative and qualitative study of macrozoobenthos.
MAČEJ, Jakub
Macrozoobenthos are aquatic invertebrates, usually bigger than approximately 2 mm, living on the bottom. The larvae of aquatic insects (mayflies, midges, caddisflies, etc.), worms, molluscs and crustaceans belong among its most important representatives. The study was performed on a pond channel of the experimental pond system of the FFPW Vodnany. The artificial substrates, made of plastic blocks from biological filters, were installed in five rows of five blocks (replications) to monitor the process of their colonization in order to evaluate their suitability for the monitoring of macrozoobenthos. At weekly intervals, one series of five artificial substrates was sampled to collect colonizing macroinvertebrates for further elaboration (determination, numbers). It was confirmed that under the conditions of a pond canal, the colonization of artificial substrates by benthic animals begins immediately during the first week of their deployment. Species diversity of macrozoobenthos, expressed in number of taxa in successive weeks afterwards was not significantly different. The results proved that artificial substrates are suitable for quantitative and qualitative monitoring of benthic macroinvertebrate assemblage.
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