WHAT NON-FREEZING,
HEAT-CARRYING LIQUID TO USE
There are two main categories to be considered when choosing the non-freezing liquid:
1. Physical aspects
The main interest is to transport a big cooling capacity within a small volume rate of flow
and with a small temperature difference between the heat exchanger and environment under a condition
of low pumping work. We can reach this with high values of specific heat, heat conductivity and with
low values of viscosity of a heat-carrying liquid.
2. Influence to the surroundings
Toxicity, biological decay ability, corrosivity, flammability and decomposition methods are other
very important aspects for choosing the right non-freezing liquid. For instance the liquidation of
ethyleneglykol is now possible only by burning and it represents 1euro to be paid.
Toxicity and flammability determine whether the medium is a subject to conditions of ADR or not.
This definitely has an influence to the price that has to be spent for storageing, transportation
and manipulation with a product. The anti-corrosive properties of a product do have a major influence
to an operating life and reliability of a secondary cooling circulation or an air-conditioning unit.
Our Non-Glycolic-Liquid (NGL) is not toxic at all, biologically decomposable, non-flammable and with a
high degree of protection against the corrosion. It also shows a very decent service life. The
liquidation has to be done with an approval of an appropriate authority responsible for water and
sewer systems. The self process is then realized by diluting the NGL with a great amount of water
and it is then flushed to a sewer system which is heading to the sewerage plant.
USE OF NGL
NGL is determined to be used in a closed secondary coolent circuit as well as in air-conditioning systems, industrial cooling, thermodynamic heat pumps and ice creating systems with a temperature up to 40°C. In recent time an increasing interest for our medium has been noticed in food producing industry (breweries, meet packing plants etc.). The reason is that companies are aiming for a use of non-toxic and non-ecotoxic materials in their production areas. NGL is colorized by red nutritional dye E 124 Brillant Ponceau 4R. This enables a better detection of untightness in the system.
NGL is being used in a concentration of required freezing point. Therefore it does not have to be diluted any longer. When a leakage occurs the system can only be re-filled by NGL. NGL has properties of an electrolyte. It has high pH. It removes galvanicaly metaled surface, surfaces varnished by electrophoresis, corrosion, impurities and water incrustation. Considering these facts there is a need for installing a filtr or a mud discharger inside the circuit. If this step is not done then arises a problem of possible pump stoppage or slim pipe obturation. But if the system shows a potential of a higher risk having impurities, corrosion or water incrustations then it can have an influence on NGL’s physical-chemical properties. If this case occurs it is necessary to remove those unintentional components.
An engine room of winter sports stadium using technology of the indirect cooling
PURITY OF HEAT EXCHANGING SURFACE
NGL uses a technology of surface-active corrosion inhibitors. A complex of these additives forms a hydrophobic layer which protects the access of corrosive compounds (inorganic salts, esters, carbon dioxide etc.) to the surface. If the surface is protected like this it is immune from creation of corrosion and sediments. It is well known that chemical compounds such as carbonates, oxides, sulphates, silicates do have these negative consequences.
A furred plate heat exchanger makes the service of cooling facility much more expensive