Experimental Study of Thermal Performance and Pressure Differences of Different Working Fluids in Two-phase Closed Thermosyphons Using Solar Energy

Year 2019, , 121 - 128, 01.03.2019

Engin Özbaş

https://doi.org/10.2339/politeknik.407258

Cited By: 6

Abstract

An experimental study is carried out to investigate
the pressure distribution and thermal performance of gravity assisted heat pipe
charged with different working fluids. Methanol, water and Mono-Ethylene-Glycol
(MEG) are chosen as working fluids which have different boiling point, density
and viscosity. An experimental test apparatus is designed and produced including
three heat pipes that heat input on the evaporator section are provided by
solar energy. Measurements are conducted on the heat pipe surface for pressure
and temperature variations. Pure antifreeze is chosen as working fluid, due to
its high boiling point, along with water and methanol which are widely used in
thermosyphon type heat pipes. Heat pipes are put into parabolic focused
vacuumed glass tube and operated by solar energy for 11 days in order to
achieve high temperatures. Data taken from 06.30 to 18.30 is taken into
consideration for experimental results. Experimental results are evaluated for
two days as (i) sunny and (ii) cloudy days by choosing days with the highest
and lowest solar radiation.  (i) As for
the sunny day, the highest storage water temperatures for methanol, water and
antifreeze were 90.0°C, 83.5°C and 86.7°C and the pressure values were 6.7 bar,
1.6 bar and 1.9 bar respectively. (ii) And for the cloudy day, the respective
values of temperature and pressure were measured as; 43.9°C, 39.3°C, 29.0°C,
and 2.0 bar, 0.2 bar and -0.3 bar.

Keywords

Heat pipe, solar energy, heating, performance

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