Refrigeration systems have more than one application, such as food preservation, equipment cooling, etc. It extracts heat from one environment and transfers it to another, thus cooling it first.
We have a wide variety of refrigeration systems, all of them different, which gives us the possibility to choose the cooling system that best suits our needs, what we are looking for.
In order to know which is the best in each situation, we must define them at various levels, and identify their advantages and disadvantages. In our article we will focus on learning more about direct and indirect refrigeration systems.
Refrigeration systems can be classified as follows:
Direct systems: Compressed and condensed refrigerant gas leaves the machine rooms and is distributed to the remote user units (evaporators) (Figure 1a).
Indirect systems: The refrigerant gas is confined in the cooling generation zone, there the cooling power is transferred to an intermediate fluid, via an exchanger. The intermediate fluid, driven by a pumping system, transports it to end-users such as air coolers, exchangers, tank coils etc. (Figure 1b).
In order to choose one system over the other, it is advisable not only to assess the LCC (life cycle cost of the installation), but also to assess the risks to people, the environment and the customer’s business, such as production losses or contractual non-compliance in the delivery of products. Assess with the customer the impact of the refrigeration system on their production cost per unit of product. Finally, assess the possible lower cost of insurance premiums.
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