Experimental analysis of a solar flat plate collector for enhancement in thermal performance using solar turbulence generators

H. S. Arun Kumar, N. Madhwesh, K. Vasudevakaranth

Research output: Contribution to journalArticle

Abstract

Solar air heaters are now-a-days used in space heating as well as a process heating in domestic applications. Since it is a renewable energy conversion device, enhancement of such devices assumes greater significance due to its lower efficiency. In this analysis, an attempt is made to improve the effectiveness of the solar collector by incorporating turbulence generating devices on the side walls of the air heater duct, which are energized by solar photo voltaic cells. The turbulence generators introduce swirl motion around them which enhances mixing of the hot and cold side of the fluid, resulting in enhanced heat transfer. It is noted from the study that with an increase in mass flow rate inside the duct, air heater with turbulence generating devices shows a remarkable improvement in the heat transfer with significant improvement in temperature rise across the duct compared to that of the smooth duct configuration. These results corroborate well with the corresponding drop in absorber plate temperature. However, with an increase in mass flow rate corresponding to the lower rotational speed of turbulence generators, the air heater with turbulence generators show a decrement in the heat transfer capacity. This results in reduction of the heat transfer capability and leads to lower temperature rise.

Original languageEnglish
Article numberIJMPERDOCT201983
Pages (from-to)939-950
Number of pages12
JournalInternational Journal of Mechanical and Production Engineering Research and Development
Volume9
Issue number5
DOIs
Publication statusPublished - 01-10-2019

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Turbulence
Ducts
Heat transfer
Air
Flow rate
Space heating
Gas generators
Industrial heating
Photovoltaic cells
Solar collectors
Energy conversion
Temperature
Hot Temperature
Fluids

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

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title = "Experimental analysis of a solar flat plate collector for enhancement in thermal performance using solar turbulence generators",
abstract = "Solar air heaters are now-a-days used in space heating as well as a process heating in domestic applications. Since it is a renewable energy conversion device, enhancement of such devices assumes greater significance due to its lower efficiency. In this analysis, an attempt is made to improve the effectiveness of the solar collector by incorporating turbulence generating devices on the side walls of the air heater duct, which are energized by solar photo voltaic cells. The turbulence generators introduce swirl motion around them which enhances mixing of the hot and cold side of the fluid, resulting in enhanced heat transfer. It is noted from the study that with an increase in mass flow rate inside the duct, air heater with turbulence generating devices shows a remarkable improvement in the heat transfer with significant improvement in temperature rise across the duct compared to that of the smooth duct configuration. These results corroborate well with the corresponding drop in absorber plate temperature. However, with an increase in mass flow rate corresponding to the lower rotational speed of turbulence generators, the air heater with turbulence generators show a decrement in the heat transfer capacity. This results in reduction of the heat transfer capability and leads to lower temperature rise.",
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AB - Solar air heaters are now-a-days used in space heating as well as a process heating in domestic applications. Since it is a renewable energy conversion device, enhancement of such devices assumes greater significance due to its lower efficiency. In this analysis, an attempt is made to improve the effectiveness of the solar collector by incorporating turbulence generating devices on the side walls of the air heater duct, which are energized by solar photo voltaic cells. The turbulence generators introduce swirl motion around them which enhances mixing of the hot and cold side of the fluid, resulting in enhanced heat transfer. It is noted from the study that with an increase in mass flow rate inside the duct, air heater with turbulence generating devices shows a remarkable improvement in the heat transfer with significant improvement in temperature rise across the duct compared to that of the smooth duct configuration. These results corroborate well with the corresponding drop in absorber plate temperature. However, with an increase in mass flow rate corresponding to the lower rotational speed of turbulence generators, the air heater with turbulence generators show a decrement in the heat transfer capacity. This results in reduction of the heat transfer capability and leads to lower temperature rise.

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