Refrigerating plants with intermediate coolant
Existing refrigerating systems can be classified by a way of cooling method into two categories:
- Direct cooling systems
- Systems with intermediate coolant
At this moment, direct cooling type is the most widely used due to its advantages: simplicity of the cooling system itself, relatively small size of heat exchangers, smaller pipelines, and, most importantly, lower financial costs of installation.
But, along with advantages, there are also a number of drawbacks, leading to the impossibility or limited use of direct cooling systems.
- Some types of refrigerants, for example ammonia are not allowed to be used in rooms, associated with continuous human presence.
- Serious pressure losses in branched systems pipelines or at big height refrigerant supply (from 10 meters and above), leading to considerable refrigerating capacity loss.
- Depressurization of equipment and leakage of expensive Freon can lead to additional financial loses to restore operability of the system.
- Danger of coolant liquid state receipt in soaking-up cavity of compressors at sharp thermal load increase.
You can solve these problems by using system with an intermediate coolant in which cooling is carried out not directly by the refrigerant, but with assistance of special fluids. In that case as a coolant can be used NaCl, CaCl2, ethylene and propylene glycol. Water is also widespread coolant in the dairy industry.
- Coolant are relatively safe from the point of view of using in rooms with people or with potential contact with the product.
- No distance limitation when placing equipment away from the cooled premises. All necessary parameters are provided while pumping station selection.
- Minimum Freon need. Financial losses after possible leakage are minimized due to lower cost of the coolant in comparison with Freon.
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