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If the parabolic trough is strictly used to heat up a fluid to transport the heat there are seveal options. If the heated fulid is used to dryve a pump or turbine the requirements are again different. They have to do with temperature range mainly.
===(Hydraulic) Pump or turbine===
Some systems only use thermal expansion below the boiling point, to drive a hydraulic pump. Others use steam from boiling fuilds to drive a pump or turbine. In those cases the fluid can be water, or water mixed with other fluids to lower the boiling point (like ammonia).
===Transfer only===
For heat transfer only one can also use water and or steam. Mineral oil is not expensive and can be bought with different characteristics. Molten salts are used in some cases because they can transfer more heat. Salt melts at 90 degerees. Salt is also a good way to store heat. One could design a system that circulates mineral oil to transfer heat from the troughs to a water storage tank.
===(Hydraulic) Pump or turbine===
Some systems only use thermal expansion below the boiling point, to drive a hydraulic pump. Others use steam from boiling fuilds to drive a pump or turbine. In those cases the fluid can be water, or water mixed with other fluids to lower the boiling point (like ammonia).
===Transfer only===
For heat transfer only one can also use water and or steam. Mineral oil is not expensive and can be bought with different characteristics. Molten salts are used in some cases because they can transfer more heat. Salt melts at 90 degerees. Salt is also a good way to store heat. One could design a system that circulates mineral oil to transfer heat from the troughs to a water storage tank.
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[[http://social.csptoday.com/industry-insight/ionic-liquids-future-heat-transfer-fluid-choice Ionic liquids (molten salt)]]
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[[http://www.multitherm.com/ Mineral oil]]
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=====What fluid do I use with my parabolic trough?=====
The tranfer fluids should be stable in a high temperature range.
[[http://www.heat-transfer-fluid.com/ Duratherm]]
[[http://www.engineeringtoolbox.com/ethylene-glycol-d_146.html EthylGlycol]]
==========
The tranfer fluids should be stable in a high temperature range.
[[http://www.heat-transfer-fluid.com/ Duratherm]]
[[http://www.engineeringtoolbox.com/ethylene-glycol-d_146.html EthylGlycol]]
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[[http://wims.unice.fr/xiao/solar/efficiency.html unice.fr]]
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**Additional References**
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[[http://www.scielo.org.za/scielo.php?pid=S0038-23532008000500013&script=sci_arttext Increasing the yield]]
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