Energy efficiency / The airtightness testing of the building 1. Thermography is an imaging technique using: GammarayInfraredUltraviolet2. The airtightness testing of the building envelope involves forcing a pressure difference between the building and its surroundings equal to:: 5 Pa50 Pa500 Pa3. If, for example, in a building of 1500 m3 volume as a result of measurement we obtain the value n50 = 2,5 h-1, it means that:3750 m3 of air per hour escapes from the building through leaks600 m3 of air per hour escapes from the building through leaks1000 m3 of air per hour escapes from the building through leaks4. For a thermovision testing to be successful, a sufficient temperature difference between outside and inside of the tested object. In general, this must be at least:5°C10 °C20 °C5. PCM materials have a relatively high heat of phase change in relation to the capacitive heat. The parameter that determines this ratio is called by:Stefan numberFourier numerNusselt number6. In commonly used heat accumulators, PCM materials are characterized by the fact that the Stefan numbers take the values: Greater than unityLess than unityVary high values7. In which units is the phase change heat measured?J / KgK / mK / kg8. In what temperature range homogeneous PCM materials solidify:At constant temperatureAt liquidus temperatureAt solidus temperature9. What phase transformation of PCM materials is accompanied by heat supply:SolidificationMeltingEvaporation10) Does the geometric shape of the PCM material affect the solidification rate?YesNoIt has a small impactYou will receive the evaluation as an e-mailE-Mail ! Datenschutz Ich habe die Datenschutzerklärung gelesen und akzeptiert. absenden E-Mail Adress (!) Pflichtfelder!
