2017 ESG

Pump away: Estação Viana’s experiment reveals a more efficient strategy for chilled water distribution

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Sonae Sierra shopping centres mainly rely on primary-secondary hydronic systems for their chilled water distribution. In these arrangements, secondary pumps account for around 70 percent of the total energy requirement for chilled water distribution, and represent up to six percent of total building electricity use.
Through a detailed analysis, Estação Viana Shopping’s team found that energy savings of 30 to 50 percent in these systems could be achieved, giving rise to cost savings ranging from €2,000 to €34,000 a year (with results varying according to the shopping centre’s location and size).

Optimize the chilled water distribution system switching from a secondary pumps control based on maintaining a constant differential pressure near or across pumps, to one which uses several pressure transducers located near the most remote heat exchangers.
Evaluate the viability of replicating this to other shopping centres in different locations and with different sizes.

From 30% to 50%

achievable energy savings
in chilled water systems

costs savings per
year

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