The paper describes the development and design of a prototype rotary magnetic refrigerator (MR), which is based on the rotary movement of active magnetic regenerators with magnetocaloric materials and on the application of permanent magnets. This paper presents the development and analysis of the structure for generating the magnetic field and the basic operational principle of the first prototype magnetic refrigerator. The second part of the paper provides a description of the development process for certain key elements of the complete magnetic refrigeration system.
COBISS.SI-ID: 11055131
This article presents an experimental analysis of cooling buildings using nighttime cold accumulation in a phase change material, known as the "free-cooling principle". Studies of the ceiling and floor free-cooling principle, as well as passive cooling, are presented and explained. Some of the types of PCMs suitable for summer cooling are listed. An experiment was conducted using paraffin to store cold during the nighttime and to cool hot air during the daytime in summer. Air temperatures and heat fluxes as a function of time are shown for different air velocities and inlet temperatures.
COBISS.SI-ID: 10742043
This paper presents an analysis of the nonlinearity of the static measuring characteristics of the hydraulic measuring bridge, which results from the impact of the flow rate on the local pressure loss coefficient of the orifices. The results of the experimental analysis were confirmed with solutions of the physical–mathematical model of the flowmeter. Another objective of this study was to evaluate the suitability of this flowmeter for pulsating flow measurements.
COBISS.SI-ID: 11121179
Experiments were performed to study the spatial-temporal temperature variation underneath growing bubbles on a thin Pt heating foil in saturated and sub cooled nucleate pool boiling of water at atmospheric pressure. The transient wall temperature distributions were recorded by a high-speed infrared camera, synchronized with a high-speed video camera for bubble motion. Examples are presented of the transient distributions of wall temperature, heat flux and heat transfer coefficient for the fast and slow bubble detachment mechanisms in saturated and sub cooled pool boiling.
COBISS.SI-ID: 10062363
This paper presents a numerical and experimental investigation of nucleate boiling from artificial nucleation sites. The numerical investigation is carried out by a hybrid mechanistic numerical code first developed at the University of Ljubljana then being redeveloped to interpret experiments on pool boiling at artificial sites on a silicon plate and as a design tool to investigate different arrangements of sites to achieve high heat fluxes. Preliminary simulations are presented to compare the wall conditions to be used in the experiments on silicon.
COBISS.SI-ID: 10694427