Abstract
Nearly zero-energy buildings are designed to minimize energy consumption and the low energy demand is to be covered by local renewable energy resources. Free cooling is a method that utilizes low outdoor temperatures as a cooling medium to save energy in air-conditioning systems and is included in nearly zero-energy buildings renewable energy use system boundary. This article explores free cooling potential of direct airside economizer in Estonia. A detailed weather analysis was conducted to develop temperature bin data, which was used to calculate free cooling potential at different ventilation supply air temperatures. The results are presented as yearly, monthly, and hourly airside economizer cooling capacities. Free cooling potential in Estonia is high from October to April, during summer months, airside economizer operation is possible at higher ventilation supply air temperatures.
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