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Heat exchangers for air-conditioning
Pavlíček, Michal ; Jaroš, Michal (referee) ; Hejčík, Jiří (advisor)
The thesis is divided into 2 parts. The first part deals with classification and characterization of heat exchangers. The sizing process of plate heat exchangers is described and demonstrated in the second part. Obtained results are compared with real plate heat exchanger produced by Güntner Company.
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Liquid thermal conductivity measurement of based on laminar convection
Kordík, Jozef ; Hrubý, Jan
This research report describes a device for liquid thermal conductivity measurement, which was designed within the internal project no. 902156. The principle of measurement is based on known heat transfer parameters in laminar flow regime. An experimental rig with a precise mass flow regulation and temperature measurements was designed for this purpose. The rig was tested with a pure water and based on measured quantities its thermal conductivities were obtained at several liquid temperatures. The resultant conductivities were compared with known values for pure water and a good agreement was achieved.
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Effect of Aero-Therm insulation layer on the overall heat transfer coefficient
Kordík, Jozef
The aim of this work was to test the properties of Aero-Therm insulation layer by determining overall heat transfer coefficients for selected cases of flow past a sphere. The material of the sphere was copper to minimize uncertainties due to internal temperature gradients. Three variants were examined, which differed in sphere surface thermal insulation. In the first variant, the sphere with a diameter of 40 mm had no insulation; only a thin layer of a copper oxide was present on the surface only. In the second variant, the sphere was coated with Aero-Therm insulating layer with a thickness of about 1.5 mm. The third variant differed from the second one in the thickness of the insulating layer, which was 2.9 mm in this case. The overall heat transfer coefficients were determined for cooling the sphere by a forced convection by air at various flow velocities.
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Heat exchangers for air-conditioning
Pavlíček, Michal ; Jaroš, Michal (referee) ; Hejčík, Jiří (advisor)
The thesis is divided into 2 parts. The first part deals with classification and characterization of heat exchangers. The sizing process of plate heat exchangers is described and demonstrated in the second part. Obtained results are compared with real plate heat exchanger produced by Güntner Company.
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