Refrigeration system

Centum Communications Team

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SUMMARY

The study to improve the Centum communications equipment cooling system starts from the thermal characterization of the base design. Originally only heat was dissipated by natural convection through the original finning. Since the contribution of forced external convection is necessary, a series of design modifications are proposed to include external fans. In addition, in order to achieve the necessary convection values, air channeling is required. This improves efficiency and heat transmission to the outside.

Thanks to CFD simulation it is possible to validate the design modifications and the correct operation of the equipment under extreme operating conditions. Within the simulation environment it is easy to reproduce the conditions to which the equipment will be exposed during the validation tests. In this way, in the design phase it is possible to ensure that the operating temperatures do not exceed the permitted limit.

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DESIGN PROPOSAL

The design of the entire ducting system has been optimized to reduce pressure drops, so that the chosen fan is capable of providing the necessary flow to ensure the required heat exchange.

The original finning has been modified, an additional cover has been added to allow air to be channeled and the lower part of said cover has been perforated to avoid overpressure problems in the fan area.

These modifications, and the rest of the design recommendations, are framed within the specified operating point, as well as according to the imposed restrictions.

Sistema refrigeración lifeseeker

RESULTS

INTERIOR AIR CONDITIONS

Due to growth limitations and drive capacity, a centrifugal fan has been chosen. It is about obtaining the highest possible convection coefficient, however, this increase comes at a cost with respect to the overpressure values ​​that the fan must overcome. To know the interior conditions of the air, it is necessary to carry out numerical simulations that allow us to know its behavior in detail.

The following images show speed and pressure values ​​for a flow rate of 40 CFM. Case study in which it was intended to evaluate the addition of a grille in the lower area to reduce the pressure values ​​around the fan.

INTERIOR AIR CONDITIONS

Due to growth limitations and drive capacity, a centrifugal fan has been chosen. It is about obtaining the highest possible convection coefficient, however, this increase comes at a cost with respect to the overpressure values ​​that the fan must overcome. To know the interior conditions of the air, it is necessary to carry out numerical simulations that allow us to know its behavior in detail.

The following images show speed and pressure values ​​for a flow rate of 40 CFM. Case study in which it was intended to evaluate the addition of a grille in the lower area to reduce the pressure values ​​around the fan.

Obtención punto funcionamiento ventilador

CHARACTERIZATION OF THE PIPELINE SYSTEM

The values ​​of thermal dissipation and maximum temperature in the components are directly related to the flow rate of the fan. Therefore, the reduction of load losses is a fundamental section to increase air flow and improve heat exchange. That is why the proposed design improvements try to minimize the pressure drop in the pipeline system.

The following image shows the different characteristic curves for the design of the cooling system. The fan’s own curve is also shown. The intersection of both curves will give us the value of the driven flow, which increases as we improve the design aerodynamically.

EVOLUTION OF TEMPERATURES

Finally, the maximum temperature values ​​in the outer casing are shown. The higher the flow, the higher the heat transfer. It is in the temperature values ​​that the advantages of optimizing the design in terms of load losses can be better appreciated.

The graph above shows the evolution of temperatures as a function of the flow rate for the final design at 45 and 55 ambient degrees. In both cases we are interested in increasing the flow to reduce the temperature values ​​and thus ensure the correct operation of the equipment.

Evolución temperaturas a 45 y 55 grados

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