Power recovery from data line in avionic applications

The world market for systems for power recovery from low-grade heat sources is of the order of £1 billion per annum. Many of these sources are hot liquids or gases from which conventional power systems convert less than 2.5 per cent of the available heat into useful power when the fluid is initially at a temperature of 100° C rising to 8–9 per cent at an initial temperature of 200°C. Consideration of the maximum work recoverable from such single-phase heat sources leads to the concept of an ideal trilateral cycle as the optimum means of power recovery. The trilateral flash cycle (TFC) system is one means of approaching this ideal which involves liquid heating only and two-phase expansion of vapour. Previous work related to this is reviewed and details of analytical studies are given which compare such a system with various types of simple Rankine cycle. It is shown that provided two-phase expanders can be made to attain adiabatic efficiencies of more than 75 per cent, the TFC system can produce outputs of up to 80 per cent more than simple Rankine cycle systems in the recovery of power from hot liquid streams in the 100–200°C temperature range. The estimated cost per unit net output is approximately equal to that of Rankine cycle systems. The preferred working fluids for TFC power plants are light hydrocarbons.

Get full-text (via PubEx)

Coupled Electric and Hydraulic Control of a PRS Turbine in a Real Transport Water Network

Water ◽

10.3390/w11061194 ◽

2019 ◽

Vol 11 (6) ◽

pp. 1194 ◽

Cited By ~ 2

Author(s):

Marco Sinagra ◽

Costanza Aricò ◽

Tullio Tucciarelli ◽

Pietro Amato ◽

Michele Fiorino

Keyword(s):

Water Distribution ◽

Rotational Velocity ◽

Characteristic Curve ◽

Velocity Variation ◽

Hydraulic Control ◽

Good Efficiency ◽

Start Up ◽

Asynchronous Generator ◽

Hydropower Production ◽

Power Recovery

Although many devices have recently been proposed for pressure regulation and energy harvesting in water distribution and transport networks, very few applications are still documented in the scientific literature. A new in-line Banki turbine with positive outflow pressure and a mobile regulating flap, named Power Recovery System (PRS), was installed and tested in a real water transport network for the regulation of pressure and flow rate. The PRS turbine was directly connected to a 55 kW asynchronous generator with variable rotational velocity, and coupled to an inverter. The start-up tests showed how automatic adjustment of the flap position and the runner velocity variation are able to change the characteristic curve of the PRS according to the flow delivered by the water manager or to the pressure set-point assigned downstream or upstream of the system, maintaining good efficiency values in hydropower production.

Get full-text (via PubEx)

Integrated Power Recovery Using Markov Modeling

18th International Conference on Nuclear Engineering: Volume 1 ◽

10.1115/icone18-29021 ◽

2010 ◽

Author(s):

Shawn Rodgers ◽

Paul Nelson ◽

Coral Betancourt ◽

Ernie Kee ◽

Fatma Yilmaz

Keyword(s):

Power Supply ◽

Integral Approach ◽

Markov Modeling ◽

Pressurized Water Reactor ◽

Convolution Integral ◽

Pressurized Water ◽

Electric Power Supply ◽

Alternative Methodology ◽

Power Recovery ◽

Convolution Method

The solution to a Markov chain modeling electric power supply to critical equipment in a typical 4-loop pressurized water reactor following a Loss of offsite power event is compared with a convolution method. The standard “convolution integral” approach is described, and an alternative methodology based on a Markov model is illustrated.

Get full-text (via PubEx)

Modelling and control of slip power recovery schemes for small hydro power stations

2004 IEEE Africon. 7th Africon Conference in Africa (IEEE Cat. No.04CH37590) ◽

10.1109/africon.2004.1406851 ◽

2005 ◽

Cited By ~ 3

Author(s):

F.N. Okafor ◽

W. Hofmann

Keyword(s):

Hydro Power ◽

Power Stations ◽

Power Recovery ◽

And Control ◽

Recovery Schemes

Get full-text (via PubEx)