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By transforming the traditional AC-powered air conditioning solution to a DC-powered dual-zone climate control solution, a mobile operator reduced their energy consumption, achieved more efficient cooling and reduced the need for power conversions from the off-grid power source to the cooling system.
A better overall solution
A mobile operator with operations in several African countries was looking to replace AC-powered cooling systems with DC, in order to achieve savings on both energy and expenditures. Dantherm presented a DC-solution that would optimise the operator's overall solution. Dantherm's solution eliminates the need for conversion, it focuses the cooling and it is very secure and easy to install.
The African challenge
Operating in Africa, a mobile operator has a number of important issues to consider. The ambient temperature rises to very high levels, the power supply is often unstable or even non-existent and the sites are vulnerable to vandalism due to the valuable electronic equipment. In order to protect its numerous African sites against melt down following the high ambient temperature, the mobile operator has now chosen to implement Dantherm's dual-zone climate control solution, thus separating the temperature sensitive batteries from the transmission equipment, Area Sales Manager Randi Sandfeld Larsen explains.
Separating cooling and ventilation
In Dantherm's dual-zone solution, the batteries are placed in an outdoor cabinet powered by DC, whilst the transmission equipment is placed in a ventilated indoor cabinet. The result is a significantly lower energy consumption, as the operator only cools down the temperature sensitive batteries. Furthermore, Dantherm's DC Air Conditioners operate without inverters that reduce the chain of conversion - leading to minimal power loss and further savings.
Mono-block design is easy to install
Dantherm replaced the mobile operator's existing split air conditioner design with a mono-block unit eliminating the visible pipes. This not only protected the units against vandalism, but also made them easy to install.
Savings of 60-70% on power used for cooling
It is always important to note that savings results vary according to factors such as indoor site temperatures, ambient temperatures and previous energy sources. But if all the options offered by Dantherm's DC-solution are utilised, we expect that the mobile operator will achieve approximately 60-70 per cent savings on the power used for cooling, Randi Sandfeld Larsen says.
The mobile operator achieved a number of significant advantages:
- The off-grid sites no longer have to convert the diesel-, solar- or wind-generated DC power to AC power, which previously caused them to suffer 10-15 per cent current loss.
- DC-powered cooling does not use extra current when starting up. AC powered cooling, on the other hand, spends up to 10 times its running current every time the temperature reaches its tolerance level and the cooling system has to start up.
- Compartment cooling prolongs battery service life and generates substantial savings.
- The sites are safer from vandalism as the mono-block unit consists of one closed-loop air conditioner without exposed pipes.
- The solution is easy to install and maintain.
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