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Noise study of heat pump
Gregorovičová, Eva ; Hejčík, Jiří (referee) ; Jedelský, Jan (advisor)
The thesis deals with a noise study of a heat pump, which is important for the assessment of the acoustic comfort of people. The thesis describes the theory of basic terms, quantities, measuring devices and the chosen method of determining sound power. The acoustic properties and technical condition of the measured heat pump, its possible noise sources and the possibilities of reducing their emissions are also described. The total noise level of the device is determined by the intensity probe according to the scanning method according to ČSN ISO 9614-2. Based on the acoustic map and frequency spectrum, the partial noise sources of the heat pump are identified. The resulting values from the measurements are compared with the manufacturer's values. The noise situation is assessed by measuring and comparing the measured values with the hygienic limits. Furthermore, the designs of the noise protection measures are assessed, and the design of the noise protection measures for the specific case is carried out. Finally, possible noise protection measures are implemented and experimentally verified. The results confirm the need for further development of heat pumps to reduce noise emissions.
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Noise measurement of electric machines
Fodor, Viktor ; Vítek, Ondřej (referee) ; Janda, Marcel (advisor)
This work discusses the problem of generating noise in electrical rotating machines, engines. First we explain what noise and sound is, its characteristics, its distribution in machines. Then we discuss the possible sources of noise in electrical motors and the possible reduction of noise. To verify the theory mentioned in this work, we will execute a noise measuring on an induction engine. Further we realize a measurement of the operating curve of the machine. Finally, we describe various measurements.
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Noise study of heat pump
Gregorovičová, Eva ; Hejčík, Jiří (referee) ; Jedelský, Jan (advisor)
The thesis deals with a noise study of a heat pump, which is important for the assessment of the acoustic comfort of people. The thesis describes the theory of basic terms, quantities, measuring devices and the chosen method of determining sound power. The acoustic properties and technical condition of the measured heat pump, its possible noise sources and the possibilities of reducing their emissions are also described. The total noise level of the device is determined by the intensity probe according to the scanning method according to ČSN ISO 9614-2. Based on the acoustic map and frequency spectrum, the partial noise sources of the heat pump are identified. The resulting values from the measurements are compared with the manufacturer's values. The noise situation is assessed by measuring and comparing the measured values with the hygienic limits. Furthermore, the designs of the noise protection measures are assessed, and the design of the noise protection measures for the specific case is carried out. Finally, possible noise protection measures are implemented and experimentally verified. The results confirm the need for further development of heat pumps to reduce noise emissions.
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Determination of sound power levels of heating equipment by measurement of the acoustic intensity
Wagnerová, Klára ; Doložílek, Miroslav (referee) ; Jedelský, Jan (advisor)
This thesis concerns method of determining sound power level of heating devices from acoustic intensity as a primary measured value. Thesis describes the characteristics of acoustic parameters and principles of acoustic measuring. Method of measurement at discret points according to ČSN EN ISO 9614-1 is compared with measurement by scanning according to ČSN ISO 9614-2. Methods are evaluated teoreticly as well as practically by companing results of experimental testing. Thesis also includes description of created model which evaluates acoustic measurement acording to the definitionof point method. The model is designed for measuring chain of Engineering Test Institute, Public Enterprise (SZU).
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Noise measurement of electric machines
Fodor, Viktor ; Vítek, Ondřej (referee) ; Janda, Marcel (advisor)
This work discusses the problem of generating noise in electrical rotating machines, engines. First we explain what noise and sound is, its characteristics, its distribution in machines. Then we discuss the possible sources of noise in electrical motors and the possible reduction of noise. To verify the theory mentioned in this work, we will execute a noise measuring on an induction engine. Further we realize a measurement of the operating curve of the machine. Finally, we describe various measurements.
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