Effect of Flow Area to Fluid Power and Turbine Pressure Drop Factor of Solar Chimney Power Plants

2017 ◽  
Vol 139 (4) ◽  
Author(s):  
Xinping Zhou ◽  
Yangyang Xu ◽  
Yaxiong Hou
Keyword(s):  
Heat Flux ◽  
Pressure Drop ◽  
Solar Collector ◽  
Power Plants ◽  
Real Life ◽  
Ideal Gas ◽  
Fluid Power ◽  
Solar Chimney ◽  
Flow Area ◽  
Ideal Gas Law

In this paper, a theoretical model of solar chimney power plants (SCPPs) is presented based on compressible ideal gas law assumptions. The theoretical optimal turbine pressure drop factors (TPDFs) for constant and nonconstant densities (CD and NCD) are studied, and the effects of flow area parameters examined. Results show that the theoretical optimal TPDF for CD is equal to 2/3 and is independent of the flow area parameters. Results also show that the theoretical optimal TPDF for NCD is close to 1 and is affected by the flow area parameters. However, the theoretical maximum fluid power (MFP) obtained for NCD is never attained in real life. For the actual states, the theoretical optimal TPDF for NCD is still effectively high enough. The TPDF and the fluid power for NCD increase with the reduction of the collector inlet area, and more precisely with the reduction of the chimney inlet area. The TPDF and the fluid power definitely increase with larger chimney flow area. The increase in the fluid power due to shape optimization of the SCPP is limited compared to that due to higher input heat flux of collector. Divergent-top and upward slanting roof shapes are recommended for the solar chimney and the solar collector, respectively, for better SCPP performance. Additionally, locations exposed to strong solar radiation are preferred for SCPPs.

Heat Transfer and Pressure Drop Through Nano-Fin Arrays in the Free-Molecular Flow Regime

2012 ◽  
Author(s):  
Michael James Martin
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Gas Flow ◽  
Ideal Gas ◽  
Molecular Flow ◽  
Ideal Gas Law ◽  
Transfer Equations ◽  
Flow Through ◽  
The One ◽  
The Ideal

Gas flow through arrays of rectangular nano-fins is modeled using the linearized free-molecular drag and heat transfer equations. These are combined with the one-dimensional equations for conservation of mass, momentum, and energy, and the ideal gas law, to find the governing equations for flow through the array. The results show that the pressure gradient, temperature, and local velocity of the gas are governed by coupled ordinary differential equations. The system of equations is solved for representative arrays of nano-fins to find the total heat transfer and pressure drop across a 1 cm chip.

Maximum fluid power condition in solar chimney power plants – An analytical approach

Solar Energy ◽  
2006 ◽  
Vol 80 (11) ◽  
pp. 1417-1423 ◽  
Author(s):  
Theodor W. von Backström ◽  
Thomas P. Fluri
Keyword(s):  
Power Plants ◽  
Analytical Approach ◽  
Fluid Power ◽  
Solar Chimney

Calculation of Pressure and Density in Solar Power Plant Chimneys

2003 ◽  
Vol 125 (1) ◽  
pp. 127-129 ◽  
Author(s):  
Theodor W. von Backstro¨m
Keyword(s):  
Power Plants ◽  
Average Density ◽  
Wall Friction ◽  
Solar Power Plant ◽  
Calculation Methods ◽  
Solar Chimney ◽  
Flow Area ◽  
Density Distributions ◽  
Internal Bracing ◽  
Mach Numbers

This technical brief develops calculation methods for the pressure drop in very tall chimneys, as in solar chimney power plants. The methods allow for density and flow area change with height, for wall friction and internal bracing drag. It presents equations for the vertical pressure and density distributions in terms of Mach number. One of these is a generalization of the adiabatic pressure lapse ratio equation to include flow at small Mach numbers. The other is analogous to the hydrostatic relationship between pressure, density, and height, but extends it to small Mach numbers. Its integration leads to an accurate value of the average density in the chimney.

scholarly journals A simple capillary viscometer based on the ideal gas law

RSC Advances ◽  
2018 ◽  
Vol 8 (53) ◽  
pp. 30441-30447 ◽  
Author(s):  
Le Hoang Phu Pham ◽  
Luis Bautista ◽  
Deyvid C. Vargas ◽  
Xiaolong Luo
Keyword(s):  
Pressure Drop ◽  
Ideal Gas ◽  
Capillary Viscometer ◽  
Fluid Viscosity ◽  
Fluid Interface ◽  
Ideal Gas Law ◽  
Interface Displacement ◽  
The Ideal

Fluid viscosity proportional to pressure drop in a capillary (L) was reflected by the air–fluid interface displacement (ΔL) to enclosed air.

Optimal turbine pressure drop for solar chimney-aided dry cooling system in coal-fired power plants

2017 ◽  
Vol 133 ◽  
pp. 87-96 ◽  
Author(s):  
Jianlan Li ◽  
Hongjing Guo ◽  
Qiang Cheng ◽  
Shuhong Huang
Keyword(s):  
Pressure Drop ◽  
Power Plants ◽  
Cooling System ◽  
Solar Chimney ◽  
Dry Cooling

Heat Transfer and Pressure Drop Through Nano-Fin Arrays in the Free-Molecular Flow Regime

2013 ◽  
Vol 135 (9) ◽  
Author(s):  
Michael James Martin
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Gas Flow ◽  
Ideal Gas ◽  
Molecular Flow ◽  
Ideal Gas Law ◽  
Transfer Equations ◽  
Flow Through ◽  
The One ◽  
The Ideal

Gas flow through arrays of rectangular nanofins is modeled using the linearized free-molecular drag and heat transfer equations. These are combined with the one-dimensional equations for conservation of mass, momentum, and energy, and the ideal gas law, to find the governing equations for flow through the array. The results show that the pressure gradient, temperature, and local velocity of the gas are governed by coupled ordinary differential equations. The system of equations is solved for representative arrays of nanofins to find the total heat transfer and pressure drop across a 1 cm chip.

Effects of flow area changes on the potential of solar chimney power plants

Energy ◽  
2013 ◽  
Vol 51 ◽  
pp. 400-406 ◽  
Author(s):  
Atit Koonsrisuk ◽  
Tawit Chitsomboon
Keyword(s):  
Power Plants ◽  
Solar Chimney ◽  
Flow Area
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