CRANE Temper
CRANE Temper is a top of the line environmentally friendly heat transfer fluid used in a wide range of refrigeration applications. The ready-mixed and nontoxic organic salt solution is readily biodegradable and combined with an effective corrosion inhibitor package. The thermal properties make CRANE Temper an excellent choice for a wide range of refrigeration applications, especially in industrial and food refrigeration industries. The product is available in seven different versions from -10°C down to -60°C.
CRANE Temper is chemically stable and will not degrade in time, has a high specific heat capacity and outstanding thermal conductivity, especially compared with propylene glycol. It is therefore classified as non-hazardous to health and the environment and does not contain any amines, nitrites or phosphates.
Key advantages at a glance
- Nontoxic
- Low viscosity
- High thermal conductivity
- Low freezing points
- Chemically stable
- Reduced installation and energy costs
- Readily biodegradable
- Adapted for the food industry
- Advanced inhibitor technology
- Personalised technical support
Areas of use, industries and installations
CRANE Temper can be used wherever a liquid Heat Transfer Fluid is required in indirect cooling, stationary or mobile installations.
Food industry
Food processing is a vital part of the food industry; an unbroken cold chain is necessary to keep the quality of the goods. With an indirect cooling system with i.e. Ammonia (NH3) as a refrigerant and CRANE Temper as heat transfer fluid, the industry has a very powerful and environmental refrigeration solution used in many secondary cooling systems.
When comparing CRANE Temper to Propylene glycol, CRANE Temper has shown to have far better thermal properties, resulting in a reduced energy consumption of the installation. CRANE Temper is non-toxic and registered in NSF Nonfood Compounds Program.
Distribution & logistics centres
Refrigeration is a key factor to ensure high quality in distribution of fresh food. Indirect systems with CRANE Temper provide distribution- and logistics centers all over the world with stable and efficient secondary cooling systems.
By choosing CRANE Temper with its low viscosity, energy consumption is significantly reduced. In addition, a system with secondary loops can easily be extended/adapted without affecting ongoing cooling activities, by just adding an additional loop.
Defrosting of CO2 air coolers
When humidity enters a cold room, the CO2 air coolers needs to be defrosted regularly. Normally, this is done by electrical defrosting, which is very energy consuming and a significant part of the installed cooling power. By switching to brine defrosting with CRANE Temper, the defrosting process becomes more efficient and shorter payback time compared with electrical defrost. The waste heat from the compressor is used to heat up the brine in order to defrost the air-coolers. This solution does not only provide the cold store with an energy-efficient system; it also significantly reduces CO2 emissions.
Powerplants
In energy plant applications, such as gas turbines, combined cycle power plants and other turbine systems, the bearings are cooled by oil, which needs a cooling system. In approximately 80% of all plants built around the world, an antifreeze is required in the cooling system. Excess heat is often used for anti-icing of incoming air for the gas turbine. Remaining heat is removed by outdoor fan coolers, which have a high risk of freezing due to ambient temperature.
CRANE Temper has, together with our customers, decades of experience and numerous successful references within this field. CRANE Temper’s thermal and environmental properties make it an excellent choice of heat transfer fluid when environmental standards and requirements needs to be taken into account.
Climate test centre
Climate test chambers are widely used in for instance the automotive industry for low temperature testing of components such as engines, heating system, oils and more. Low temperature testing is also performed in other industrial applications like testing of heat pumps and more. When you want to create extreme temperature conditions (down to -55°C) CRANE Temper is a suitable product to use in this application or where a heat transfer fluid with low freezing point is needed.
Fuel cell / hydrogen tanking station
A fuel cell car is powered by an electric motor. The fuel cell produces electric current that drives the vehicle. When hydrogen is used in fuel cells, hydrogen is converted together with oxygen and forms pure water.
When storing and refueling, you need to cool the hydrogen gas. When refueling cooling can take place both underground and above ground, but the principle is the same. At the filling station, the hydrogen gas is cooled to take up less volume, which means faster refueling with larger quantities. The better the cooling, the faster refueling.
There are clear signals that hydrogen cars will come in greater numbers from several car manufacturers in the coming years. In addition to the cars, there is therefore a need for hydrogen stations.
Supermarkets
Supermarkets are the cornerstones in modern life and a high quality of refrigerated and frozen products is taken for granted in our everyday life. A secondary refrigeration system with CRANE Temper as heat transfer fluid will ensure high quality of the products and minimize the environmental footprint.
Physical Properties
| Unit | T-10 | T-15 | T-20 | T-30 | T-40 | T-55 | T-60 | |
|---|---|---|---|---|---|---|---|---|
| Density | kg / m3 | 1086 | 1114 | 1142 | 1177 | 1207 | 1240 | 1260 |
| Specific heat | KG/kg • K | 3,577 | 3,447 | 3,315 | 3,124 | 3,012 | 2,817 | 2,820 |
| Thermal conductivity | W/m • K | 0,544 | 0,525 | 0,508 | 0,486 | 0,465 | 0,441 | 0,440 |
| Dynamic viscosity | mPa • s | 1,,48 | 1,62 | 1,79 | 2,17 | 2,76 | 4,06 | 4,28 |
| Kinematic viscosity | mm²/s | 1,37 | 1,45 | 1,57 | 1,84 | 2,29 | 3,27 | 3,40 |
Thermal Properties Calculator
The main part of cooling and freezing is within food applications. MPG or 1,2-MonoPropylene Glycol is perhaps the most commonly used heat transfer fluid in those applications. Comparison between Temper and MPG has been done from freezing point of -40°C to -10°C. Below -40°C the viscosity of MPG gets too high for practical use. Already @ -30°C, the viscosity is so high that the centrifugal pumps barely can be used. A thumb rule is that at kinematic viscosity above 300 cSt, centrifugal pumps cannot be used. Other types of pumps are very expensive and inefficient. The calculations (Reynolds number, pressure drop and heat transfer coefficient) are made for circular tubes.
Performance
CRANE Temper’s excellent fluid properties in terms of viscosity, specific heat and thermal conductivity make it the ideal choice as Heat Transfer Fluid (HTF) at very low temperatures. The fluid properties not only enable users to use smaller pumps and heat exchangers but also significantly reduce total energy consumption. This applies especially at very low temperatures, as seen in the below comparison between CRANE Temper and Glycol.
Kinematic Viscosity of Temper and Glycol
Corrosion Protection
CRANE Temper is a high-quality product based on potassium salts with an optimal concentration of corrosion inhibitors. The optimal corrosion package creates, and only when necessary, a local temporary and very thin protective layer with a minimal (mono-molecular) thickness at the metal surface. This allows very good heat transfer.
To quantify the corrosion protection efficiency, different corrosion tests are used. KRAHN Specialty Fluids has chosen the ASTM D1384 test, which is the most frequent used among heat transfer fluids. Figures in the table represent the change in weight before and after the test.
Environment
CRANE Temper is readily biodegradable, nontoxic and non-flammable and does not contain nitrites, borates, phosphates, molybdates or silicates.
The freezing point depression substances in CRANE Temper contains mainly potassium acetate, which is used as food preservative and is more environmentally friendly than many of its counterparts. The properties of potassium acetate ensure it is less corrosive, has a lower toxicity level to fish, mammals and vegetation, meaning environmental impact is minimal.
| Nontoxic to mammals
LD50 (oral, rat) > 5000mg/kg |
Microtox
Not acute toxic |
| Non-toxic to aquatic animals
OECD TG 203: LC50/96 = 13 900mg/l |
Readily biodegradable
OECD 301A: 99 % after 28 days |
| ? | ? |
| Do not bio-accumulate |
Packaging
CRANE Temper is supplied in the following packaging, as well as bulk deliveries for larger volumes;
- 25L blue canister made of PE with sealed cap, the canister?s weight is 1,2kg.
- 208L blue barrel made of PE, with a sealed cap, the barrel?s weight is 9kg.
- 1000 L non-translucent IBC, the IBC weight is 70kg. Outlet valve NW50
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