1. Compliance of the coolant with the technical characteristics of the heating or cooling system
2. Security
3. Longevity
4. Anti-corrosion
5. Antiscale
6. Temperatures
7. Verified manufacturer.

These are general rules when choosing any coolant or coolant. However, when choosing a coolant for a solar system and, in general, when buying it, it is necessary to take into account a little more technical features of the latter.
First of all, when choosing a solar installation, it is recommended to check what protection against boiling and excessive pressure is in this installation. Perhaps this system is equipped with a controller. Namely, the overpressure and temperature valve. The presence of such a KIDT controller will provide you with a “quiet life”, as it provides control of the pressure and temperature of the coolant in the system, preventing overheating. Such a valve automatically relieves excess pressure (max allowable pressure in the system (5 atm.) and discharges hot water (steam) when the temperature reaches 98°C.
Also, to increase the safety of the system, expansion membrane tanks, a safety valve for steam release or modern mechanisms such as “AuroStep” can be used. All these methods will help to avoid stagnation in the system, its unwanted breakdowns and, moreover, increase the stability and increase the durability of the coolant.
It is very important to correctly design and calculate the operating conditions of the solar battery system and take into account climatic features. Indeed, one of the advantages of modern solar systems is their all-weather operation, therefore, not water is used as a heat carrier for such systems, but a special non-freezing liquid based on glycol with a high boiling point.

Best to use propylene glycol based heat transfer agent</ a> and distilled water, which does not contain nitrites, phosphates and borates and is safe for humans and the environment. The proportion of propylene glycol and water for such a coolant, recommended by manufacturers of solar installations, averages 45% glycol and 55% water.

The coolant of our production FREEZLIGHT -32°C for solar systems is a safe non-freezing liquid based on propylene glycol. In addition, this coolant contains < strong>distilled water, European quality anti-corrosion and anti-foam additives and dye.< /span>

Heat media for solar panels tm FREEZLIGHT fully meet the requirements DIN 4757 part 3 for solar systems, their production is approved by the international certificate ISO 9001.

I would like to pay attention to the issue of stagnation and, as a result, boiling of non-freezing liquid in the solar system.

So what is the boiling point of the coolant?

There is a rule – the higher the pressure in the system, the higher the boiling point of the coolant becomes.

Given that the maximum allowable pressure is up to 5 atmospheres, we calculate:
The boiling point of the coolant at a pressure of 2 atmospheres is 126-128˚С. At a pressure of 3 atmospheres, the coolant will boil at a temperature of about 140˚С, and at 4 atmospheres – about 150˚С.

The benefits of using “FREEZLIGHT” for solar systems:

1. Does not freeze unlike water at low temperatures
2. Works well in stagnation.
3. The concentrate withstands temperatures ranging from -60 to +188-190°С
4. Protection against scale and corrosion
5. Safe for all system elements, including rubber seals
6. Safety for humans and the environment
7. Low viscosity and easy to overclock
8. 5 year quality guarantee

FREEZLIGHT anti-freeze fluid with a package of anti-corrosion additives from the best European manufacturers – 100% protection against freezing and corrosion in the system.

However, the heating fluid in the solar system should be checked regularly. Typically, manufacturers of solar installations recommend doing this once a year. Such an event is necessary to check and maintain the declared temperature of the coolant, to study the stability of its physical and chemical properties, and, accordingly, the possibility of further use.
We, as manufacturers of heat transfer fluids, do such an analysis in our production laboratory for our customers absolutely free of charge. You can also conduct mini analytics yourself. For this you need:

• drain a small amount of coolant from the system (1-1.5l)
• check its organoleptic properties (color, consistency, uniformity)
• measure the pH of the solution using indicator strips (pH must be at least 7 units)

If the quality of the coolant does not meet the norm, it should be replaced.

The Heat transfer fluid for solar systems message appeared first on Novohim.

First of all, you need to know that in Europe there is a classification of antifreezes developed by Volkswagen based on antifreeze and type of additives:

G-11 – green, blue antifreeze
G-12 – red antifreeze
G-13 – yellow, orange or purple antifreeze

However, we do not recommend choosing antifreeze by one color. Because, if in Europe they adhere to this scheme, then American antifreeze manufacturers paint their product without observing it at all. Therefore, the main selection criterion is still the class of additives, namely G-11, G-12 or G-13.

Which antifreeze is best for cars? Let’s describe each type separately.

1. Antifreezes G-11

For European manufacturers, this is an antifreeze liquid of green or blue color based on ethylene glycol. With a package of anti-corrosion and anti-foam additives. Contains organic components and silicates. Forms a protective film on the washed surfaces. However, it is short-lived and crumbles pretty soon. It is a fairly budget option for antifreeze. The service life of such antifreeze is 2-3 years.

2. Antifreezes G-12

Ethylene glycol red carboxylate antifreeze. It has a carboxylate formula of additives – based on carboxylic organic acids. It does not contain borates, phosphates and silicates. Carboxylate additives act only in places where corrosion occurs and, unlike inorganic additives, do not form a protective film over the entire surface. Maintain high thermal conductivity and stability of antifreeze properties. Guaranteed protection against cavitation corrosion, scale formation and deposits in the car cooling system. Protect the engine from overheating. The cost of red antifreeze is in the middle price category. The service life of g12 carboxylate antifreeze is more than 5 years.
Follow the link and order FREEZLIGHT -40°C carboxylate antifreeze and FREEZLIGHT antifreeze red concentrate directly on the website

3. Antifreezes G12+

Similar to G-12, but may contain phosphates. Which helps to improve the quality of antifreeze through water softening.
Follow the link and order FREEZLIGHT -40°C carboxylate antifreeze and FREEZLIGHT antifreeze red concentrate directly on the website

4. Antifreeze liquids G-13

Anti-freeze liquids based on propylene glycol with hybrid (lobrid) additives. Eco-friendly and safe for humans. They decompose faster in nature. However, compared to other antifreezes, it has the highest price. The composition of the additives of such antifreeze includes organic components, may contain silicates. Service life 5-10 years.

5. TOSOL

A classic antifreeze for early production cars based on monoethylene glycol with traditional inorganic additives. Most often it is blue in color and is designed for temperatures up to -40 ° C or -50 ° C. However, it no longer meets all international standards of the automotive industry and loses much in terms of physical and chemical properties to modern antifreezes.

Can antifreezes be mixed?

First of all, if you need to mix two antifreezes, the reference should be to the composition of their additives. So, only antifreezes of the same composition and class of additives are allowed to be mixed.
For example, it is not recommended to pour an antifreeze liquid with inorganic additives into carboxylates. As a result of their chemical combination, antifreeze can precipitate in the form of flakes and clog the entire cooling system.

Antifreeze miscibility chart< /span>

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HOW TO CHOOSE A COOLANT

First of all, it is worth noting that the most popular coolants can be based on:

• propylene glycol – FREEZLIGHT -32°C and FREEZLIGHT -20°C
• glycerin – FREEZLIGHT -32°C, FREEZLIGHT -20°C
• ethylene glycol – FREEZLIGHT -32°C, FREEZLIGHT -20°C

We do not recommend salt heat transfer fluids for use due to a significant corrosive effect on heating system materials.

1. Propylene glycol based heat transfer agent

It is an absolutely safe substance for humans and the environment. In addition, it is a universal heating fluid. Namely, it can be used in:

• heating systems of any kind and with different types of boiler
• solar panel systems
• chillers
• air conditioning systems
• refrigeration
• combustion engines

Operation peculiarities of propylene glycol coolant:

1. It has the lowest density due to which it practically does not need a power reserve of pumping equipment. The coolant is easily dispersed through the pipes even after a long downtime of the system.
2. It has a low freezing point, does not expand like water.
3. It has strong thermal conductivity, stability at high and low temperatures.
4. Due to its physical and chemical characteristics it is considered to be a universal coolant, which can be recommended for all engineering heating and cooling systems.
5. Environmentally safe.

It has a low freezing point, strong thermal conductivity, high and low temperature stability and low viscosity. These properties and environmental safety make propylene glycol-based coolant number 1 in the rating of heating fluids.

2. Heat carrier based on glycerin

Like propylene glycol coolant, it is an environmentally friendly product. It is worth noting that glycerin is the first substance that began to be used in the production of antifreeze, about 100 years ago. And only in the mid-30s of the XX century, glycols and their mixtures began to be used as antifreeze liquids. However, there are some features due to which the glycerin-based coolant may be limited in use.

Operation peculiarities of glycerine coolant:

1. Glycerine-based heat transfer fluid has the highest density compared to propylene glycol and ethylene glycol heat transfer fluids. This property makes it much more difficult for glycerine coolant to move through the pipework, especially if the system has not been in operation for some time.
2. In addition, to accelerate the glycerine-based coolant through the system, a pump with a power reserve 3-5 times greater than for water is required.
3. The basis of the coolant – glycerine, due to its physical and chemical properties, is not able to withstand high temperatures of more than 90 ° C for a long time. In case of overheating, glycerine starts to decompose and release a toxic compound acrolein, which will require immediate replacement of such coolant.
4. For correct operation, glycerine-based coolant can be recommended only for gas boilers, where the temperature is stable and does not rise above 60-70°C.
   For example, in an electric boiler with heating elements the temperature can rise up to 300°C, and in a solid fuel boiler there are sharp temperature spikes on the walls of the heat exchanger as the fuel is added, which is also destructive for glycerine coolant.

3. Heat transfer fluid based on ethylene glycol

Effective glycol with a low freezing point and physical and chemical properties similar to propylene glycol. However, unlike propylene glycol, its vapors are quite toxic to humans. It is this fact that limits the scope of ethylene glycol in heating systems. Where can I use ethylene glycol based antifreeze:

• in single circuit closed heating systems
• in cooling systems
• in combustion engine cooling systems

Peculiarities of ethylene glycol coolant operation:

1. Toxicity of ethylene glycol vapours limits the possibility of its operation in residential premises and open heating systems.
2. Relatively easy to disperse through the system, does not require heavy-duty pumping equipment.
3. It has a low freezing point, does not expand like water.
4. It has strong thermal conductivity, stability at high and low temperatures.

Note that ethylene glycol is not approved for use in food processing plants.
In case of accidental leakage of such a coolant, urgent measures must be taken to eliminate the breakdown. When working with ethylene glycol, personal protective equipment is used: rubber gloves, an apron, goggles and a respirator.

Sometimes we are asked what is the best coolant to use in the case of natural circulation of liquid in the heating system, the answer is propylene glycol-based coolant. Because it has the lowest density among coolants based on ethylene glycol and glycerine. And it is thanks to this advantage of lightness that the propylene glycol-based heating fluid, as a result of hydrostatic head, will be better distributed and work correctly in the system even in the absence of power supply.

Follow the link and order a heat transfer fluid for heating in the “Freezlight” Heat transfer fluids catalog

Scheme for selecting a heat carrier for a heating system by parameters:

This diagram will help you choose the coolant that is ideal for your heating system. Click on the desired temperature in the table header and go to the page of the selected coolant!

IMPORTANT! Coolants of the “FREEZLIGHT” trademark correspond to the international certification ISO 9001, are made on the basis of components and additives of the best European manufacturers.</strong >

“FREEZLIGHT” is 100% guaranteed against freezing and corrosion heating system. In addition, with us you can always analyze the coolant poured into the system and get recommendations for its adjustment.
Get in touch!

The How to choose a coolant for heating message appeared first on Novohim.

Why use a propylene glycol solution for heating and air conditioning systems?< /h3>
Propylene glycol solution recommended for:< /strong>

• autonomous heating systems for private homes and businesses
• refrigeration units
• air conditioning systems
• propylene glycol solution for heat pumps
• solar panels
• chillers
• cooling systems

It can also be used in open loop systems and at food enterprises.

Properties of an aqueous solution of propylene glycol from Novokhim Company:

1. DOES NOT FREEZE, unlike water
2. SAFE for humans and the environment
3. Corresponds to the specified crystallization temperature (according to the table)
4. This is a ready-made liquid, does not require additional dilution
5. Good for system materials and rubber seals

IMPORTANT! One of the most important components of the solution, in addition to distilled water, are additives.

It follows from the above that this solution, produced under industrial conditions with the addition of all necessary components, including a combined additive package, will be more durable, stable and safe in operation.

The density and freezing of a solution directly depend on its concentration. Below is a table for clarity.

Table 1.
Freezing point and density of propylene glycol aqueous solutions.

Propylene glycol solution will cost slightly more than ethylene glycol solution. However, the safety and environmental friendliness of its use is worth it. Moreover, the use of ethylene glycol solutions is recommended only for heating systems with a closed expansion tank.

Read more about the ethylene glycol solution here

During operation, especially if water was previously used in the system, some features and characteristics of the propylene glycol solution should be taken into account:< /span>

1. The viscosity of a glycol solution is 2-3 times higher than that of water. This means that the movement of the aqueous solution through the pipes of the system will be normal if a powerful circulation pump is installed. With a power reserve of 10-15%.
2. The coefficient of thermal expansion of propylene glycol is greater than that of water. Therefore, it is rational to use an expansion tank with an increased volume.
3. Prevent the solution from boiling to avoid irreversible changes in properties.
4. The heat capacity of aqueous solutions of propylene glycol is 10-15% lower than that of water, which somewhat reduces heat transfer.

Click on the link and choose your heating solution:

based on propylene glycol

glycerin

ethylene glycol based

For individual selection and calculation of the required fluid in the heating or cooling system please contact our technical specialists. Trust the professionals!

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What are the advantages and disadvantages of this substance when used and why is it popular to buy a solution of ethylene glycol in water?

First of all, it is worth mentioning the main properties of the ethylene glycol solution. Namely:

1. Ethylene glycol solution has a lower freezing point than concentrate
2. DOES NOT FREEZE, unlike water, in the system
3. Can only be used in closed loop systems due to fumes toxicity
4. Has a lower viscosity than concentrated ethylene glycol
5. It is a ready-made liquid for heating / cooling systems at a given temperature (does not require additional dilution)

As you can see, there are clear advantages to using this solution. It can also be added to the pluses that the price of an ethylene glycol solution is much lower compared to an aqueous solution of propylene glycol, for example. But there are also downsides.

The choice of an aqueous glycol solution is best done individually, based on from:

• the type and purpose of the room for the operation of the heat carrier/cooler
• type and technological features of the equipment or heating system
• budget
• type of fluid previously poured into the system
• temperature setting
• other features

Follow the link and read all the characteristics of the propylene glycol solution

For individual selection and calculation of the necessary liquid in the system heating or cooling please contact our technical specialists.

Click on the link and see all options for heating fluids based on propylene glycol, glycerin and ethylene glycol

The freezing point of pure ethylene glycol is -13C°. The preparation of an aqueous solution from the concentrate makes it possible to obtain lower freezing temperatures of the substance. For example, for various weather conditions and features of work, an aqueous solution of ethylene glycol is produced with a concentration of 30.35, 40, 45, 50, 55 and 65%. However, even when it freezes, it does not solidify or expand like water. It thickens and slightly increases in volume.

IMPORTANT! Diluting more than 50% of ethylene glycol with water significantly reduces the performance of the finished heat transfer fluid/refrigerant.

Below is a table showing the dependence of crystallization of ethylene glycol solutions on their concentration.

Table 1
Freezing point of aqueous solutions of ethylene glycol depending on concentration.

During operation, it should be taken into account that its thermophysical properties are different from those of water. Namely:

1. The viscosity of a glycol solution is 1.5-2 times higher than the viscosity of water. This means that the movement of the aqueous solution through the pipes of the system will be normal if a powerful circulation pump is installed. With a power reserve of 10-15%.
2. Ethylene glycol solution has a higher thermal expansion coefficient than water. Therefore, it is rational to use an expansion tank with an increased volume.
3. Ethylene glycol fumes are toxic, which means it can only be used in single-loop closed systems.
4. The boiling point of an ethylene glycol solution can range from 101.1C° at 10% solution to 137.2 at 90%. As you can see, depending on the concentration. The bottom line is to prevent the solution from boiling in the system, as this will irreversibly affect the possibility of its further use.
5. The heat capacity of an aqueous solution of ethylene glycol is 15-17% lower than that of water, which somewhat reduces heat transfer.

It is important to remind you that if the system is depressurized and this substance leaks, it is urgent to repair the damage and replace the necessary elements.

When when working with ethylene glycol concentrate or its solution, it is necessary to use personal protective equipment – a respirator, rubber gloves and goggles. Trust your equipment and safety to professionals!

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