Heat recovery control: prevention of overheating

What does this smart-ready service measure?

This service falls under the Ventilation domain within the Smart Readiness Indicator (SRI). The SRI is a European assessment framework that measures how well a building handles smart technology. This specific service examines heat recovery control: the system that reuses warmth from exhaust air to heat incoming air.

Without control, heat recovery can cause rooms to overheat, for example on warm days. This service assesses whether a building automation and control system (BACS) addresses this and how advanced that control is.

Which functionality levels exist?

The service has three levels, ranging from 0 to 2. Each level represents a higher degree of automation and overheating prevention.

• Level 0: There is no control to prevent overheating.
• Level 1: The system modulates or bypasses heat recovery based on sensors in the exhaust air.
• Level 2: The system uses multiple room temperature sensors or predictive control, which anticipates future conditions.

A higher level typically means more precise and faster response to temperature changes in the building.

How does this service count toward the score?

This service is not part of method A, the simplified assessment with 27 services. It counts only in method B, the full methodology with all 54 smart-ready services distributed across nine domains.

Each functionality level is assessed against seven impact criteria, such as energy efficiency and comfort. Three of those criteria are key functionalities and carry equal weight in the building's final score, expressed as a percentage and classified into one of seven classes.