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Solid sorption cooler with composite sorbent bed and heat pipe thermal control

100%

Vasiliev L. , Tsitovich A. , Zhuravlyov A. , Antough A.

Polska Energetyka Słoneczna

2012

tom nr 1-4

12-18

Three adsorbers cooler was experimentally investigated. Ammonia was chosen as a working fluid. Two adsorbers (twins) were filled with the same complex compound (activated carbon fibre with MnCl2 microcrystals on the filament surface). The third low temperature adsorber had second complex compound (activated carbon fibre with BaCl2 microcrystals on the filament surface). The cycle of physical adsorption and chemical reactions in the sorbent bed of adsorber was followed with condensation/evaporation of ammonia inside the pores of the sorbent material. The specific feature of the third adsorber is the time of its cold generation. It is the sum of the liquid evaporation time and the time of desorption/regeneration of ammonia in the sorbent bed. This is a novelty of cooler design, which increases the heat and cold generation capacity and rate. The cooler thermal management is based on vapordynamic thermosyphons. The solar heat is the source of energy of cooler. The sink of the cold is the air flow.

Flat polymer loop thermosyphons

88%

Vasiliev L. , Grakovich L. , Rabetsky M. , Zhuravlyov A. , Vassiliev Jr. L.

Archives of Thermodynamics

2018

tom Vol. 39, no 1

75--90

The flat horizontal polymer loop thermosyphon with flexible transport lines is suggested and tested. The thermosyphon envelope consists of a polyamide composite with carbon based high thermal conductive micro-, nanofilaments and nanoparticles to increase its effective thermal conductivity up to 11 W/(m°C). Rectangular capillary mini grooves inside the evaporator and condenser of thermosyphon are used as a mean of heat transfer enhancement. The tested working fluid is R600. Thermosyphon evaporator and condenser are similar in design, have a long service life. In this paper three different methods (transient, quasi-stationary, and stationary) have been used to determine the thermophysical properties of polymer composites used as an envelope of thermosyphon, which make it possible to design a wide range of new heat transfer equipment. The results obtained contribute to establish the viability of using polymer thermosyphons for ground heat sinks (solar energy storage), gas-liquid heat exchanger applications involving seawater and other corrosive fluids, efficient cooling of superconductive magnets impregnated with epoxy/carbon composites to prevent wire movement, enhance stability, and diminish heat generation.

Propane pool boiling heat transfer on horizontal tube

75%

Vasiliev L. , Zhuravlyov A. , Khrolenok V. , Novikov M. , Rak A. , Mazyuk V.

Zeszyty Naukowe Politechniki Świętokrzyskiej. Mechanika

1999

tom Z. 67

339--347

An experimental investigation of propane boiling heat transfer was done on single horizontal smooth tubes and tubes with porous coverings. Three modes of heat transfer were determined on evaporation surfaces with increasing heat flux: free convection, a transitional mode (the average vapor bubble population was negligible) and developed boiling. The existence of the region length depends on saturation pressure, the kind of evaporation surface, and the direction of heat flux change. On heat flux reduction, a strong heat-flux hysteresis phenomenon was observed: the picture regarding changes of heat transfer regimes the same, but boiling extended into the region which was occupied by free convection. In the wide range of saturation pressures and heat fluxes, the intensity of heat transfer on the samples with porous coatings is high than that on the smooth surface samples. The research carried out showed that an application of metal porous covering with electric arc gas-thermal spraying allows one to increase significantly (3-5 times as high in the region of low heat loads, q < 8 kW/m2, and 2.5-3 times in the region of high heat fluxes, q > 8 kW/m2) the heat transfer intensity for propane boiling on horizontal tubes.