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Experimental study of density effect and natural convection in a latent heat storage unit with paraffin wax and air
Author(s) -
Lanka Sandeep Raj,
Bandaru Durga Prasad,
Sane Sreenivasulu
Publication year - 2021
Publication title -
energy storage
Language(s) - English
Resource type - Journals
ISSN - 2578-4862
DOI - 10.1002/est2.226
Subject(s) - natural convection , jump , mechanics , paraffin wax , thermodynamics , materials science , latent heat , heat exchanger , tube (container) , phase change material , convection , wax , intersection (aeronautics) , phase change , chemistry , composite material , physics , engineering , quantum mechanics , aerospace engineering
Experimental analysis is carried out on tube in tube type heat exchanger. The phase change material (PCM) is melted under the influence of high‐temperature air as HTF. PCM density effect is presented with the temperature change in axial and radial positions. During charging, the lower elevation temperature curve's intersection with the higher elevation's temperature curves is identified. The earliest intersection is found at 20 minutes with 51°C. The late intersection is found at 62 minutes and 75°C. Natural convection jump phenomenon is also spotted. Each temperature curve in middle and outer radial positions is classified into three categories (before the jump, during the jump, and after the jump). Natural convection jumps are found in the range of 2.667 to 8.5 ° C/minute. The density effect and natural convection jump are found to be insignificant during discharging.