What Eurovent Certification Is Eurovent certification is an independent, third-party verification that a manufacturer’s published energy-recovery performance matches tested results. Certified products appear in a public directory with their verified ratings. Why It Reduces Risk Recovery effectiveness is easy to overstate in a brochure. Certification against a method such as EN 308 gives buyers a […]
EN 16798: Ventilation Requirements and Energy Recovery in Buildings
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 […]
GB/T 21087: China’s Standard for Air-to-Air Energy Recovery Devices
Scope of GB/T 21087 GB/T 21087 is China’s national standard for air-to-air energy recovery devices. It covers the common recovery types used in Chinese and exported equipment: plate (recuperative), rotary wheel (regenerative), heat-pipe, and run-around coil systems. What It Specifies The standard defines classification, technical requirements, test methods, inspection rules, and marking or labeling. It […]
AHRI 1060: Rating Air-to-Air Energy Recovery Ventilation Equipment
What AHRI 1060 Covers AHRI 1060 is the Air-Conditioning, Heating, and Refrigeration Institute standard that rates air-to-air energy recovery ventilation (ERV) and heat recovery ventilation (HRV) equipment. It defines how manufacturers must test and report the performance that buyers actually compare: sensible effectiveness, total (enthalpy) effectiveness, rated airflow, external static pressure, and supply- and exhaust-side […]
Fan Static Pressure Class: Matching the Fan to the Recovery Core
Static vs total pressure Total pressure is the full energy of the moving air; static pressure is the usable pushing force after velocity energy is set aside. Fans are classed by the static pressure they can develop against a system - and the recovery core is one of the biggest resistances in that system. Core […]
Seasonal Energy Recovery Efficiency: Why Nameplate Effectiveness Is Not the Year
Rated vs real A core may be rated at 75% effectiveness, but the energy saved over a year is lower, because recovery is most valuable in extreme weather and can even hurt in mild weather (it reheats supply you wanted cool). The seasonal efficiency weights effectiveness by the hours and temperature lifts actually seen. What […]
Rotary Wheel Purge Sector: How Wheels Reduce Carryover
What a purge sector is A rotary energy wheel spins exhaust and supply airstreams through the same matrix, so a small amount of exhaust gas and moisture is inevitably carried into the supply. A purge sector is a slice of the wheel (typically 5-15 degrees) where a portion of the clean supply air is directed […]
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 […]
Air Changes per Hour (ACH): The Ventilation Rate Behind Recovery Load
Definition Air changes per hour is the volumetric airflow divided by the room volume, expressed per hour: ACH = (volumetric_flow_rate / room_volume) x 3600 An ACH of 6 means the room air is theoretically replaced six times in an hour. Typical values Classrooms: about 4-6 ACH (see school ventilation) Laboratories and fume hoods: 6-12 ACH […]
Psychrometric Processes in Heat Recovery: What Happens on the Chart
Four basic processes On the psychrometric chart, ventilation air moves along predictable lines: Heating: horizontal line to the right (dry-bulb up, moisture constant). Sensible cooling: horizontal line to the left (dry-bulb down, moisture constant). Humidification: line upward (more moisture). Dehumidification: line downward (condensation, latent heat released). Sensible recovery = a move along the constant-humidity line […]