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External CFD simulation – Data center

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What use of the CFD simulation for the local generating sets?

Ventilation adapted to systems for different uses

Generating sets dissipate heat during the production of electrical energy and a sufficiently ventilated space is required to keep the temperature within the operating range. Heat is removed from the generator set by inducing air flow through a ventilation system around the engine.

Generator rooms therefore require appropriate ventilation . These diesel or gas engines can be used for ship propulsion, or for power generation and are exposed to varying climatic conditions: from the extreme cold of the arctic to the heat of the tropics. These engines must therefore continue to operate in all environments.

The ventilation of these machine rooms is of vital importance by allowing :

Generally, the airflow through the machine room is calculated using the average room temperature and does not take into account the extreme weather conditions that may be associated with it.

We study the ventilation systems of the generators in their final commissioning condition

We support the manufacturers of these units by providing advice on the amount of air required for combustion and advising on the air flow rate required to accommodate engine cooling. We offer assistance on the global ventilation of these machine rooms, the study of the impact of the rejections on the systems in the vicinity and the calculation of the pressure losses of the acoustic systems.

Presence of aeraulic recirculation on the climatic systems

What are the steps of a CFD simulation applied to the study of systems?

CFD simulations allow thermal analysis of technical rooms that can not easily be carried out by experimentation.

To create a computer model, first of all, the geometry of the building is slightly simplified. This involves removing gaps and small edges that would result in too many finite elements when generating the mesh.

The model is then used to establish global thermal profiles for certain extreme climates. The main objective is to conduct analyses on air inlets and outlets. These are usually channeled to direct the flow around the operating parts for better efficiency of the generator set engine (Genset).

It is then possible to accurately compare several variants and toobtain a large amount of information: pressure, maximum intake temperature, air displacement, pollutant displacement, etc.

Calculation of pressure drops by CFD simulation and sizing of generator set fans

We carry out head loss studies for acoustic baffles and sizing of fans. As a function of air velocities, pressure drops become exponential. The different elements that disturb the fan flows are the presence of the diesel engine and the generator.

Louvers and acoustic baffles near the exhaust and upstream are a major source of pressure drop for the fans. Minor flow resistance comes from battery banks, fuel tanks, intake pipes and the engine exhaust stack.

In addition to the flow inside the room, another flow must be taken care of: it is the wind flow on the building. This is due to the possibility of the wind blowing on the generating set room, which can cause a higher pressure drop and especially to recirculate the overheated exhaust gases to the engine inlet.

Study of pressure losses

Contamination of HVAC systems by diesel engine exhaust

We study the diffusion of Nox and other pollutants that can degrade new air in offices

The generator set is one of the best ways to overcome power cuts. However, this is a double-edged sword. It should be remembered that the engine of this equipment gives off polluting substances to produce electricity. It is more precisely carbon dioxide , sulfur and nitrogen oxides . In general, generator sets run on gasoline, gas or diesel. They can therefore pollute the atmosphere in the vicinity, especially in case of intensive use during a power failure.

Our analyses can include the monitoring of exhaust gas dispersion.

We study the dissipation of pollutants from generator discharges and we verify that there is no direct recirculation on my hygienic air intake systems (AHU) of the nearby premises.

CFD studies of plumes for an extreme scenario

Process Industriel : on the same subject