Friogel Monopropylene Glycol

Transcription

1 CLIMALIFE DEHON Van Konijnenburgweg PL Bergen op Zoom T: F: E: Friogel Monopropylene Glycol TECHNICAL DATA SHEET

2 F R I O G E L 1. DEFINITION based on monopropylene glycol and corrosion inhibitors, is a heat transfer fluid, concentrated antifreeze, specially designed for refrigerating circuits working at low temperatures. After dilution with water, permits to obtain an excellent protection again frost and a reinforced protection against corrosion of the metals that are presents in the new and existing circuits (steel, aluminium, copper, brass, welding, etc...) ; this protection was checked by various static and dynamic tests. The formula is approved by Conseil Supérieur d'hygiène Publique in France (French Public Health board) as heat transfer fluid in sanitary water production with single exchange because it does not present any significant risk for health. (Authorisation n 1549 dated October 29,1981) Its exclusive formula was developped to ensure an excellent compatibility with calcareous water as it avoids risks of precipitation of inhibitors. However, it is better to add demineralised water to avoid deposit of fur. Besides, risks of mid term depositions due to corrosion in the installation and alteration of chemical components are significantly reduced thanks to the stability of the inhibition formula. Checking the concentration in is recommended during servicing (once a year at least) to avoid any risk of clogging-up. It is easily identified by its red color. 2. PHYSICO-CHEMICAL PROPERTIES OF Appearance... red liquid Density (AFNOR NF R ) at 20 C... 1,051 ± 0,002 ph (AFNOR NF T ) 50 % volume in water... 8 ± 0,2 33 % volume in water... 8 ± 0,2 Alkaline reserve (AFNOR NF T ) (ml HCI N/10 for 10 ml ) ± 1 ml Freezing point C (AFNOR NF T ) 33 % volume in water ± 2 C 50 % volume in water ± 2 C Boiling temperature C (AFNOR R ) at atmospheric pressure ± 2 C Flash point C (ASTM D 93) C 3. PHYSICO-CHEMICAL PROPERTIES OF OF AQUEOUS SOLUTIONS 3.1. Freezing point (AFNOR NF T ) Freezing points of aqueous solutions given page 2 correspond to the formation of a crystalline mixture and not to a compact solidification. Freezing points are, anyhow, subject to variation due to possible surfusion phenomenons. For use as a heat transfer fluid and especially at low temperatures (below zero C), it is imperative to take into account the viscosity (see table page 3) to calculate pressure drops (see page 5). Indeed, viscosities of monopropylene glycol based solutions are perceptibly higher than monoethylene glycol-based solutions, especially when closer to the freezing point. % of (in volume) Freezing point in C ±

3 Conservation of antifreeze / anticorrosion capacity of aqueous solutions Decreases of content in aqueous solutions, even when they are brought near their boiling temperature, are close to zero due to the low volatility and due to the fact that no azeotrop forms with water. Most installations being sealed nowadays, water cannot evaporate and the antifreeze capacity of aqueous solutions is kept if no leakage occurs. On the contrary, in older systems which would include open expansions vessels, it is recommended to check the pressure gauge and to reintroduce water in the installation if necessary, while checking the antifreeze concentration thanks to the density. In all cases, it is recommended to check at least once a year the concentration in of the solution by measuring its density at 20 C using a densimeter or by controlling its freezing point. It is necessary to proceed to the verification of water ph in the circuit, of external corrosion of pipings / radiators and to the identification of the zones where circulation is poor or to valves block Density of aqueous solutions at 20 C Percentage of (in volume) Density of the solution kg / l 10 1, , , , , , , , , , ,051 Densities read on the scale of an appropriate densimeter correspond very roughly to the density given at 20 C. Taking into account small density variations of the product depending on its concentration in water, it is necessary to use a precise enough densimeter Boiling points of aqueous solutions % (in volume) Boiling point (in C) Contraction of + water solutions at 20 C Mixing a volume A of with a volume B of water gives a volume V smaller than the sum A + B. (A + B) - V The contraction of the mixture in % volume corresponds to the following equations: (100) (A + B)

4 Mixture (in liters) Final volume obtained (in liters) Contraction of the mixture Water ,6 0, ,2 0, ,7 1, ,4 1, Kinematic viscosity of aqueous solutions (expressed in centistocks cst) * Temperature en C Freezing range , ,3 60,8 83,1-10 9,7 12,8 16,9 22,3 29,3 38,2 0 6,0 7,7 9,8 12,4 15,7 19,7 10 3,9 4,9 6,1 7,5 9,2 11,2 20 2,8 3,3 4,0 4,9 5,8 6,9 30 2,0 2,4 2,8 3,3 3,9 4,5 40 1,5 1,8 2,1 2,4 2,8 3,1 50 1,2 1,4 1,6 1,8 2,1 2,3 60 1,0 1,1 1,3 1,4 1,6 1,8 70 0,8 0,9 1,0 1,2 1,3 1,4 80 0,7 0,8 0,9 1,0 1,1 1,2 90 0,6 0,7 0,7 0,8 0,9 1, ,5 0,6 0,7 0,7 0,8 0, Specific heat of aqueous solutions (in kj. kg -1.K -1 )* Temperature in C Freezing range ,4-20 3,6 3,5 3,4-10 3,9 3,8 3,7 3,6 3,5 3,4 0 3,9 3,9 3,8 3,7 3,6 3,5 10 4,0 3,9 3,8 3,7 3,6 3,5 20 4,0 3,9 3,8 3,7 3,6 3,5 30 4,0 3,9 3,8 3,8 3,7 3,6 40 4,0 3,9 3,9 3,8 3,7 3,6 50 4,0 3,9 3,9 3,8 3,7 3,7 60 4,0 4,0 3,9 3,8 3,8 3,7 70 4,0 4,0 3,9 3,9 3,8 3,7 80 4,1 4,0 4,0 3,9 3,8 3,8 90 4,1 4,0 4,0 3,9 3,9 3, ,1 4,0 4,0 4,0 3,9 3,8

5 3. 7. Thermal conductibility of aqueous solutions (in W.m -1.K -1 )* Temperature in C Freezing range , ,41 0,40 0, ,46 0,45 0,43 0,42 0,40 0,39 0 0,47 0,45 0,43 0,42 0,40 0, ,48 0,46 0,44 0,42 0,40 0, ,48 0,46 0,44 0,42 0,40 0, ,49 0,47 0,44 0,42 0,40 0, ,50 0,47 0,44 0,42 0,40 0, ,50 0,47 0,45 0,42 0,40 0, ,51 0,48 0,45 0,42 0,40 0, ,51 0,48 0,45 0,42 0,40 0, ,52 0,49 0,46 0,43 0,40 0, ,52 0,49 0,46 0,43 0,40 0, ,53 0,50 0,46 0,43 0,40 0,37 * bibliographic data Index of refraction of aqueous solutions at 20 C Percentage of (in volume) Index of refraction 30 1, , , , , , , , Protection of metals with in aqueous solution (NF R ) Metals in solution Loss in mass (mg / test tube) Limits of standard NF R Copper 2-5 <= <= + 5 Weld seam 3-5 <= <= + 5 Brass 2-5 <= <= + 5 Steel 1-2,5 <= <= + 2,5 Cast iron 1-4 <= <= + 4 Aluminium 2-10 <= <= + 20 These tests were implemented with FRIOGEL diluted at 33 % 4. CALCULTION OF PRESSURE DROPS When using an antifreeze solution in a transfer circuit at positive and especially negative temperatures, it is necessary to take into account the viscosity of the solution to calculate pressure drops. As an indication, the following table gives the increase of pressure drop to apply compared to water : for turbulent smooth flow (copper K = 0,03) for turbulent rough flow (steel K = 0,05)

6 Pressure drop coefficient - 10 C 0 C + 20 C 30 % in volume in water Water 20 C copper 1,96 steel 1,42 copper 1,61 steel 1,28 copper 1,30 steel 1,15 40 % in volume in water Water 20 C copper 2,08 steel 1,46 copper 1,86 steel 1,38 copper 1,43 steel 1,20 5. RECOMMENDATIONS FOR USE Cleaning of the installation It is highly recommended to clean thoroughly the systems before filling them with the + water mixture if they contain significant deposits and especially metallic oxides. Operating mode is as follows : - empty rapidly and completely the installation at the lowest point, after making water flow during 1 or 2 hours, - prepare a 20 g/liter solution of "dispersant D*" in water, - introduce the obtained solution into the installation, - allow the product to circulate during at least 2 hours, - empty rapidly the installation at its lowest point, - rinse abundantly and thoroughly with plain water until water flows clear and that ph is near 7 (± 0,5). Depending on the state of the circuit, a second cleaning is sometimes necessary. After each cleaning, it is important to empty and rinse thoroughly. Note : if the installation is furred and very oxydised with incrustations, it is recommended to treat it first with a 100 g/l solution of "desoxydant P*" in water circulating 2 hours at 50 C. After emptying, use "dispersant D*" as described above Introduction of in the installation It is recommended to prepare the mixture before filling the installation, in order to obtain a good homogeneity and to carry out filling with an appropriate pump, connected to the discharge outlet. Since glycol-based water solutions have a higher wetting capacity than water itself, it is recommended to check the compatibility of the joints with this product (especially with porous joints such as paper or fiber...). When filling an installation, it may be necessary to retighten joints and fittings to avoid any oozing Recommendations In order to obtain a sufficient corrosion protection, the minimum concentration should be of 33 % volume. However, considering the diversity of materials used in the installations (exchangers, fittings, nozzle...), it is recommended to contact the components manufacturers to check that their products are compatible with monopropylene glycol. * Commercialized by dehon service. Information contained in this technical document are only given as indications and cannot in any way engage the responsability of dehon service /10.99