Solar & Thermal Storage

Application

Globaltherm^® Omnitech is a high performance synthetic heat transfer fluid designed to meet the demands of liquid or vapour phase systems and indirect heat transfer. The no.1 choice for concentrated solar power and thermal electricity applications, PET and plastics production and chemical industries.

About Globaltherm® Omnitech

Globaltherm^® Omnitech is a synthetic thermal fluid which combines low viscosity and exceptional thermal stability for consistent performance.

• Globaltherm® Omnitech is a diphenyl ether-biphenyl HTF mixture

• The eutectic mixture of diphenyl oxide and biphenylgives this heat transfer fluid flexibility to perform in both vapour and liquid phases. It is miscible and interchangeable (for top-up or dilution purposes) with other similar mix thermal fluids.

• Globaltherm Omnitech HTF has low viscosity (2.5 cst at 40°C [104°F])

• This thermal fluid is excellent for use in heat transfer fluid systems which require very precise temperature control due its ability to operate as a vapour phase fluid

• This heat transfer fluid is highly dependable

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Parameter	Unit	Code	Result
Appearance	N/A	N/A	Clear-to-light yellow liquid with a geranium-like odour
Operating range	°C (°F)		15 to 400 (59 to 752) liquid phase. 257 to 400 (495 to 752) vapour phase
Vapour pressure	Psia		152.02
Freeze Point	°C (°F)	N/A	12°C (53.6°F)
Viscosity (at min. use temp)		ASTM D445	4.91
Viscosity (at max. use temp)		ASTM D445	0.13
Flash Point PMC	°C (°F)	ASTM D93	113 (236 °F)
Flash Point COC	°C		123
Coefficient of thermal expansion	°C		0.000979/ °C
Autoignition point	°C (°F)	ASTM E659	599 (1110°F)
Pour point	°C	ISO 3016	11
Neutralisation Nr (acid), TAN	mgKOH/g	ASTM D974	<0.2
Maximum bulk temperature	°C	NTR	400
Maximum film temperature	°C	NTR	425
Boiling point at 1013 mbar	°C (°F)	NTR	257
Average molecular weight	NTR	NTR	166
Moisture content	PPM	ASTM D6304	<300

Note: The information given in the typical data does not constitute a specification but is an indication based on current production and can be affected by allowable production tolerances. The right to make modifications is reserved. This edition supersedes all previous editions and information contained within them. Typical values should not be construed as a guaranteed analysis of any specific lot or as specifications for the product. Abbreviations: OC, open cup test; COC, Cleveland open cup test; and, NTR, no test reported.

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We provide advice on how to choose the most appropriate oil for your heat transfer applications and provide our customers with continued technical support.

Call us on +44 (0)1785 760555 for more information

Application

Globaltherm^® Omnipure is a highly efficient non-toxic, heat transfer fluid that is designed specifically for Concentrated Solar Plant (CSP) and thermal storage applications, PET and plastics production and chemical industries.

About Globaltherm® Omnipure

This heat transfer fluid is made from highly refined mineral oil and has superior oxidation properties for optimum performance.

• Globaltherm® Omnipure thermal  fluid is made from severely hydro-treated base stocks and has outstanding thermal oxidation stability allowing for operation at high temperatures for extended periods.

• Globaltherm® Omnipure is non-hazardous, non-toxic, water white and odourless.

• This heat transfer fluid is specifically developed for non-pressurised, indirectly heated, liquid phase heat transfer systems found in Concentrated Solar Plant (CSP) and thermal storage applications that require bulk temperatures up to 326°C (619°F)

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Contact us for more information on high temperature thermal oils

We provide advice on how to choose the most appropriate oil for your heat transfer applications and provide our customers with continued technical support.

Call us on +44 (0)1785 760555 for more information

Application

Non-hazardous, low toxicity, silicone based heat transfer fluid. Globaltherm^® Omnisol is the high temperature silicone based thermal fluid for Concentrated Solar Power (CSP) thermal storage applications.

About Globaltherm® Omnisol

• Globaltherm® Omnisol – is a silicone based heat transfer media used in solar thermal storage applications at high temperatures.

• Omnisol can safely withstand temperatures up to 425°C (797°F).

• Globaltherm® Omnisol delivers the high thermal stability and reliable heat transfer of a polydimethylsiloxane mixture with a low pumpability point of -65°C (-85°F). Globaltherm ® Omnisol is a high performing low toxicity, low fire risk, heat transfer fluid for CSP applications operating up to 425°C (797°F).

• Globaltherm® Omnisol is suitable for use in parabolic trough applications requiring a low freeze point and low temperature pumpability.

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We provide advice on how to choose the most appropriate oil for your heat transfer applications and provide our customers with continued technical support.

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Application

Non-toxic and non-flammable heat transfer media. Globaltherm^® Omnistore MS-600 is the high temperature heat transfer media for Concentrated Solar Power (CSP) and thermal electricity storage applications.

About Globaltherm® Omnistore MS-600

• Globaltherm® Omnistore MS-600 – is a molten salt heat transfer media used in solar thermal storage applications at very high temperatures.

• Omnistore MS-600 can safely withstand temperatures up to 600°C (1076°F), higher than most heat transfer media on the market today.

• Globaltherm® Omnistore MS-600 molten salt  heat transfer media has excellent thermo-physical properties in the liquid state, such as low viscosity, high heat capacity, and high thermal conductivity. Globaltherm’s heat transfer molten salts provide long-term heat storage for high-temperature applications.

• Globaltherm® Omnistore MS-600 minimises safety hazards and the need for high-pressure equipment.

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Contact us for more information on high temperature thermal oils

We provide advice on how to choose the most appropriate oil for your heat transfer applications and provide our customers with continued technical support.

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Application

Globaltherm^® S is a high performance heat transfer fluid for use in closed loop, non-pressurised heat transfer systems. Primary uses are chemical industries and plastic processing applications.

About Globaltherm® S

Globaltherm^® S is recommended for use in an upper temperature range from 250°C (482°F) to 350°C (662°F), but can be used intermittently at film temperatures as high as 380°C (716° F).

• Globaltherm® S heat transfer fluid is non-corrosive and can be used in non-pressurised heat transfer systems

• This heat transfer fluid can be used in systems requiring start-up temperatures as low as -5°C (23°F) without the need for heat tracing

• Globaltherm® S thermal fluid is thermally stable up to 300°C (572°F) and can be used for several years below this temperature with no adverse impact on performance

• Low viscosity 17cSt @ 40°C (104°F) with a pumping limit at -5°C (23°F)

• This thermal fluid has a high ASTM D93 flash point at 200°C – the highest in class

• Globaltherm® S has high thermal stress resistance in the bulk temperature range  from 60°C-350°C (140°F - 662°F)

• Globaltherm® S has a highly aromatic structure with a boiling point range of 385°C -395°C (725°F -743°F) - the highest in class

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Contact us for more information on high temperature thermal oils

We provide advice on how to choose the most appropriate oil for your heat transfer applications and provide our customers with continued technical support.

Call us on +44 (0)1785 760555 for more information

Also known as central receiver systems, solar power towers use an array of dual axis mirrors called heliostats, which track sunlight. These systems offer higher energy efficiency and better thermal energy storage capability than parabolic troughs.

These systems consist of a stand-alone parabolic reflector that concentrates sunlight onto a receiver. The reflector tracks the sun along two axes and the system uses a Stirling Engine to generate power.

These systems are made of multiple thin, flat reflectors that concentrate sunlight onto tubes through which heat transfer fluid is pumped.

Globaltherm^® has a range of heat transfer fluids designed for use in CSP applications. They work at precise temperatures for prolonged periods of time. The range is highly efficient and each product has different qualities to suit a range of applications. These fluids also have superior anti-oxidation properties for optimum performance.

 

All heat transfers will degrade over time and engineers should monitor the degradation process to ensure that it does not impact production. When operated at a high temperature for long periods of time the fluid will begin to break down.

When the bonds between of hydrocarbon chains break, this produces short-chained “light ends”. The higher the operating temperature, the more light ends are generated, and the rate at which they are produced is dependent on the oil type and the operating temperature.

Light ends boil and ignite at lower temperatures and reduce the flash point of thermal fluid. This creates a fire hazard and companies have a duty to manage this in line with the Dangerous Substances and Explosive Atmospheres Regulations (DSEAR) as well as with the explosive atmosphere (ATEX) regulations. Light ends also lead to cavitation in thermal fluid system pumps, which can lead to operational problems. When light ends are generated, both system and workforce safety are severely compromised.

The heat transfer fluid cannot be seen when circulating inside the system, so it is difficult to monitor its condition. Implementing regular thermal fluid testing and analysis is the best way to understand what is happening inside the system.

Global Heat Transfer’s flash point management service includes two flash point tests. Engineers will do an open test to test the fluid when it comes into contact with oxygen and a closed test when the fluid is contained in the system.

If sample analysis shows that the flash point temperature has dropped then it is highly likely that there are light-ends contained in the fluid.

As a part of Global Heat Transfer’s preventative maintenance programme, Thermocare, manufacturers can receive 24 hour engineering support for their systems. These engineers will also take regular samples and analyse the fluid to give concentrated solar power plant managers an accurate representation of what is happening inside the system.