Abstract
Twenty percent of global electricity supplied to the buildings is used for preventing air temperature increase; its consumption for this prevention will triple by 2050 up to China’s present needs. Heat removed from the thermal power plants may drive cold generation in the absorption devices where mass and heat transfer are two-phase phenomena; hence liquid film break-up into the rivulets is extensively investigated, which needs knowledge of the velocity profiles. Laminar flow in a pipe is used in the preliminary study, velocity profile of developed flow is used as a benchmark. The study account writes the applied apparatus with their calibration procedure, and the uncertainty estimation algorithm. The calibration regression line with the slope close to one and a high Pearson’s coefficient value is the final outcome. Therefore, the apparatus may be applied in the principal research.
Highlights
Students’ Scientific Society “Heat Engineer”, Faculty of Civil Engineering and Environmental Sciences, Bialystok University of Technology, Wiejska Street 45 A, 15-351 Białystok, Poland; Department of HVAC Engineering, Faculty of Civil Engineering and Environmental Sciences, Bialystok
Crisis in cold generation approaches the world’s economy, for the air conditioners and electric fans working against air temperature increase need nearly 20% of the total electrical energy used in buildings in the world
The absorption refrigeration system might utilize heat that is removed from the thermal power plant during electricity generation
Summary
Crisis in cold generation approaches the world’s economy, for the air conditioners and electric fans working against air temperature increase need nearly 20% of the total electrical energy used in buildings in the world. When the absorbent solution is overflowing the tubes, two phenomena are occurring simultaneously: heat and mass exchange, which are mathematically modeled using two different algorithms; modelling heat exchange needs a knowledge of film thickness, which is computed from a velocity profile Despite different geometry, both Alvarez and Bourouis [4] and Jeong and Garimella [20] apply, in their models, a laminar velocity profile derived by Nusselt, mentioned above, derived for a flow along the vertical plate. The experimental investigations of the velocity profiles in the rivulets and liquid films, for a Reynolds number in range from 400 to 3000 and Kapitza number 3000–6000, determined with laser Doppler anemometer (LDA) usage, is the main area of the investigation, which will be done for water flows along copper, aluminum, brass, and stainless steel plates. Film thickness δ as a function surface inclination towards horizon
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