What EN 16798 Covers The EN 16798 series (which replaced EN 15251) sets the framework for indoor environmental quality and the energy performance of ventilation and building services. It defines how much ventilation is needed and, through the accompanying energy requirements, when recovery is effectively mandatory. Energy Recovery in the Standard Where outdoor-air rates are […]
Outdoor Air Ratio: Why 100% Outside-Air Spaces Need Recovery Most
Definition The outdoor-air ratio (OAR) is the share of supply air that is genuinely fresh outdoor air: OAR = outdoor_air_flow / total_supply_air_flow A space with no recirculation runs at OAR = 1 (100% outside air). Where OAR is forced to 1 Some spaces cannot recirculate for safety or code reasons: Cleanrooms and graded pharmaceutical suites […]
China Fresh Air (ERV/HRV) Ventilation Industry: Hubs and Market Status
Market Scale and Headroom China’s fresh-air (ventilation with energy recovery, ERV/HRV) market reached roughly RMB 40-60 billion in 2024, depending on whether installation and accessories are included. Penetration sits around 12%, far below the 40%+ seen in Europe and North America – leaving substantial long-term headroom as health-awareness and building codes tighten. Manufacturing Hubs Guangdong […]
Heat Recovery Ventilation in Schools and Classrooms
Why Schools Need Heat Recovery Ventilation Classrooms are among the most densely occupied spaces in any building. With 20 to 30 students per room and high metabolic CO2 loads, ventilation rates under ASHRAE 62.1 approach 10 to 15 litres per second per person. Without recovery, exhausting that air year-round means discarding both heating energy in […]
Hospital Heat Recovery Without Losing Air Quality
Why hospitals recover heat Hospitals run 24/7 with very high fresh-air rates – operating theatres, isolation rooms, and wards all demand conditioned outdoor air. Ventilation can be 30-50% of a hospital’s energy bill. Air-to-air recovery cuts that load sharply, but infection control sets a hard rule: supply and exhaust must never mix. The safe choice: […]
Supermarket Heat Recovery: Refrigeration + Ventilation
Two loads, one building Supermarkets and big-box retail bleed energy in two ways: refrigeration rejects heat constantly, while fresh-air ventilation (bakery, deli, entrances) demands conditioning. Heat recovery bridges them. Ventilation recovery Exhaust from the sales floor is warm and can pre-heat incoming make-up air in winter via a rotary wheel or plate exchanger. In cooling […]
Air Handling Units (AHU) and Heat Recovery Integration
An air handling unit (AHU) conditions outdoor air before it enters a building. Without recovery, that outdoor air must be heated or cooled from scratch every hour. Adding a heat recovery core to the AHU is the single highest-impact energy measure for ventilation systems. Where the Exchanger Sits in an AHU The recovery core is […]
WELL Building Standard Ventilation
The WELL Building Standard v2 (IWBI) is a performance standard for occupant health, and ventilation is one of its strongest levers. Where energy codes set a floor for “acceptable” air, WELL rewards going well beyond it. This article covers the Air Concept features most relevant to recovery and ventilation design. Feature A06 — Enhanced Ventilation […]
IECC 2024: Energy Recovery Ventilation Provisions Explained
IECC 2024 and the Energy Recovery Link The 2024 International Energy Conservation Code (IECC) addresses commercial ventilation largely by reference to ASHRAE 62.1-2022. Because 62.1 already requires energy recovery on many large outdoor-air systems, IECC 2024 indirectly tightens ERV expectations, in Climate Zones 4 to 8 an energy recovery ventilator is commonly required where a […]
Tunnel Ventilation Heat Recovery
Tunnels and underground spaces move enormous volumes of air, and the ventilation fans are among the largest energy consumers on the whole facility. Jet fans push air along the tunnel, supply and exhaust fans replace it, and in a cold-climate region the incoming air is heated before it enters so it does not freeze the […]