Heat-carrying agents are used to transfer thermal energy usually in the form of a cooling agent and are applied in most engineering systems used for transmission (distribution) of heat.
The main problems faced by consumers when choosing a heat-carrying agent in general are:
- Operating range, i.e. a range of temperatures at which the heat-carrying agent can function smoothly without significant loss of its consumer characteristics.
- Heat capacity, i.e. the amount of heat-carrying agent which is required to be pumped per unit of time to transfer a predetermined amount of heat.
- Corrosiveness, i.e. limitations to the use of some heat-carrying agents without additives of suitable corrosion inhibitors, as well as to the construction material of the heat transfer circuit.
- Viscosity, i.e. property of heat-carrying agent that can influence the rate of its circulation, the coefficient of heat transfer in heat exchangers and etc, depending on the operating temperature.
- Lubricity, i.e. potential restrictions imposed on the design and materials of the circulation pump and other components and mechanisms which are in direct contact with heat-carrying agent.
- Safety, i.e. minimization of the likelihood of damage occurrence to human health, biological objects and environment (environmental hazards) by direct contact with heat-carrying agent.
- Inertness to foaming, i.e. parameter which directly affects the efficiency factor of pumps and heat exchange equipment.
Improper selection or use of poor quality heat-carrying agents may impair the thermal stability of the system and the emergence of other serious problems, such as:
- Increased corrosion processes on metal surfaces.
- Scaling and salt deposits on the walls of the equipment.
- Foaming of the working fluid and depreciation of pumping equipment.
- Deterioration of the thermophysical properties of the working fluid during its operation process.
All these factors, singly or in aggregate, may cause defrosting of the system and create unfavorable conditions for violations of the operation of heat exchange equipment which is fraught with emergencies.
Particular attention should be paid to the toxicity indicators of applied heat-carrying agents and coolants, as this characteristic can add its negative element in the quality of output products.
"NPP SPETSAVIA" produces heat-carrying agents and coolants based on glycols with different factors of chilling temperatures. Currently such compositions are the most effective and durable. They are characterized by low freezing point, high heat capacity and thermal conductivity. For the food industry it is recommended to get a heat-carrying agent and coolant based on propylene glycol, as they correspond more closely to the safety criteria.