Cooling Efficiency

When multiple cooling units are installed closely together there is a good change they affect one another. The units efficiency is largely effected by its intake air temperature. In order to provide cooling, air is heated within the unit exiting at a higher temperature than ambient. If short circuiting between one’s exhaust and another’s intake occurs this directly leads to loss of efficiency and capacity.

Computational possibilities

Computational Fluid Dynamics (CFD) is extremely useful to evaluate cooling equipment designs for possible short circuiting. Flows can be tracked back from intakes and forward from exhausts. Providing the possibility to assess the system performance for a particular case.

Besides assessing the performance for one or more particular cases we can offer a year round analyses. With our 128 core computer it is feasible (cost and time) to run enough scenarios to create performance trends of the different units. With these trends and hourly weather data we can estimate annual performance depending on wind, temperature and humidity.

This enables you to justify investments, accurately predict running costs and energy consumption. Since the trends are calculate by CFD, in depth analyses can be conducted for those cases that do not meet the required performance. The possibilities to analyse and optimize are endless.

High Rise Tower Colombo, Sri Lanka

48 floors with a total height of 156 meters, two cavities (5.5m x 2.5m W x D) housing air conditioning split units on small balconies hidden by 43 mm thick and 96 mm deep bars with a 107 mm spacing.

Simulation objective was to investigate split unit intake air temperature to verify if it keeps within the specified limit. Several configurations, scenarios and optimization have led to a design that satisfies the client wishes.

To make an accurate estimation of the airflow a 78 million unstructured grid was used. To account for the dynamic effects a steady state simulation was followed by a time dependent in order to get insight in air intake temperature fluctuations.

Chiller configuration surrounded by sound wall

It is rather common to install a number of chiller units within a sound wall. For this configuration it is expected that fresh air intake is limited and short circuit between intake and exhaust will occur (especially when considering wind). Various installation and structural solutions can be thought of, CFD simulations calculate the performance in order to justify (additional) costs to optimize.

The surrounding buildings for this study were included to have a good understanding of the wind effect for this particular location. With the use of this simulation a better chiller arrangement was found and energy reduction achieved.

Datacentre roof layout

Datacentre cooling is essential for its operation reliability and should always be available during all different climate conditions. Cooling generation equipment is mostly installed on the roof of the facility, next to exhaust systems for generators, air handling units etc., all generating heat on top of the building.

By means of CFD the magnitude of the heating up effect can be assessed for different weather conditions, e.g. changing wind directions, velocities and solar irradiation. The CFD Simulations