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Water-paraffin dispersion systems: manufacturing and application

Yovchenko Alla, Bespalko Sergii, Tryhub Oksana, Poliakov Sviatoslav, Baret Guy, Munoz Miranda Alberto

Acta Innovations

2020

no. 36

31--47

The paper presents the study results of the stability and heat storage capacity of paraffin-in-water phase change suspensions (PCSs) obtained by the homogenization of paraffin and water in the developed rotary hydrodynamic homogenizer. The optimal concentration of components for obtaining stable paraffin-in-water suspensions is found. It is shown that the stable PCSs in the form of pastes, gels, and liquids can be obtained depending on the concentration of water, paraffin, and the surface active agent (SAA) as well as its type. In addition, the scheme of the solar heating system with the heat storage tank where the PCS functions both as the heat transfer fluid and the heat storage media is presented. It is shown that the use of PCS in the domestic solar heating system allowed the heat storage capacity of the storage tank to be increased by 25% as a result of the high fusion heat of paraffin and the high value of the water specific heat capacity. The estimation of the saving rate from applying fluid PCS as a heat storage medium is also presented and discussed.

Dynamic modeling of operation of controlled solar heating system in EcosimPro

Kantor R., Seweryn P.

Czasopismo Techniczne. Mechanika

2016

Y. 113, iss. 2-M

129--138

The article describes the structure and operation of virtual one-dimensional dynamic model of the solar heating system using components from the libraries of the EcosimPro program. The model is based on a fragment of a real hybrid sorption-compressor refrigeration system, designed and built in the Laboratory of Thermodynamics and Thermal Machines Measurements at the Faculty of Mechanical Engineering of the Cracow University of Technology. In the second part of the paper, the results of the dynamic simulation are shown along with their comparison to the actual measurement data recorded during one day (and night).

Prezentowany artykuł zawiera opis struktury i działania wirtualnego jednowymiarowego dynamicznego modelu solarnego systemu grzewczego przy użyciu komponentów z bibliotek programu EcosimPro. Model oparty jest na fragmencie rzeczywistego hybrydowego sorpcyjnosprężarkowego systemu ziębniczego, zaprojektowanego i zbudowanego w Laboratorium Termodynamiki i Pomiarów Maszyn Cieplnych na Wydziale Mechanicznym Politechniki Krakowskiej. W drugiej części artykułu pokazano wyniki dynamicznej symulacji i ich porównanie do rzeczywistych danych pomiarowych, zarejestrowanych w ciągu jednej doby.

Możliwości wykorzystania szyb spektralnie selektywnych w pasywnych systemach słonecznych w budynkach

Nowak Ł., Nowak H.

Budownictwo o Zoptymalizowanym Potencjale Energetycznym

2005

nr (3)

250--256

A rational usage of solar radiation is a fundamental problem in the passive solar heating systems. Periods of maximum energy demand in the winter and maximum availability in the summer do not coincide with each other. Spectrally selective glazings could have significant meaning in creating proper heat balance in buildings with passive solar heating systems. The paper presents some usage opportunities of the spectrally selective glazings with the passive solar heating systems in buildings.