New cooling strategy lead to 32% total energy savings

A Spanish broadband provider and telecommunications operator was looking for a way to reduce energy consumption by at least 20% in more than 100,000 shelters housing radio transmission equipment and battery racks.

In particular, they were interested in a solution which would optimally protect all enclosed electronics, in spite of different temperature sensitivities of radio transmission equipment and batteries.

The existing cooling setup consisted of traditional air-conditioning as main cooling method, with free cooling backup and a constant overall site temperature of 23°C to protect the batteries.

Site analysis and recommendations

Via a technical consultant, the operator established contact with Dantherm. Following site visits, a specific cooling need analysis and specifications from the customer, Dantherm established a test site based on the following recommendations below:

The solution: Less active cooling – more durability

The test site was divided into two zones, with the batteries enclosed in an insulated battery box. The remaining shelter temperature was raised to 38°C, which enabled increased use of free cooling over active cooling.

Looking at the diagrams, it is evident that the combined (and redefined) use of free cooling and air-conditioning creates significant energy savings on cooling.

By raising the internal temperature and using free cooling as the main cooling solution, the active cooling use was reduced by 62% - from 24 hours/day to 9 hours/day on average. In total the site energy consumption was reduced by 32% and the new setup even reduced wear of the air-conditioner, thus prolonging the unit service life.

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