ASHRAE 62.1 Ventilation and Energy Recovery

目次

• Section 6.2 uses the Ventilation Rate Procedure. The outdoor air requirement for a space is: Vbz = Rp × P + Ra × A where Rp is the outdoor airflow per person, Ra is per unit area, P is the number of people, and A is the floor area. Table 6.2.2.1 lists Rp and Ra for every occupancy. High Rp spaces (classrooms, gyms, labs) push outdoor-air fractions above the 70% threshold that triggers ASHRAE 90.1 recovery mandates.
• More outdoor air means more heating and cooling load. A membrane energy recovery ventilator or wheel returns most of that energy to the incoming stream. 62.1 requires that ventilation not create pressurization problems. Balanced supply and exhaust with a recovery core keeps the building near neutral pressure. In critical spaces, separation matters: labs and cleanrooms favor non-cross-contaminating membrane cores over rotating wheels.
• When a space has local exhaust (fume hoods, kitchens), 62.1 requires matching makeup air. That makeup air is a prime recovery candidate — but check the 90.1 exceptions for hazardous and grease exhaust before specifying a wheel.
• Start from the 62.1 rate, then run the AHU selection calculation and the AHU component layout with the recovery core in the airstream. Sizing the recovery device first lets you right-size the cooling coil and heating coil on the recovered load, often saving one equipment size.

あSHRAE 62.1-2022 sets the minimum ventilation rates for acceptable indoor air quality, and its requirements directly drive how much outdoor air — and therefore how much recoverable energy — a system must handle. Energy recovery is the bridge between good ventilation and reasonable energy bills.

Section 6.2 uses the Ventilation Rate Procedure. The outdoor air requirement for a space is:

V_bz = R_p × P + R_{1T P3Tb01TP3 T8aa% e6} × A

where R_p is the outdoor airflow per person, R_{1T P3Tb01TP3 T8aa% e6} is per unit area, P is the number of people, and A is the floor area. Table 6.2.2.1 lists R_p and R_{1T P3Tb01TP3 T8aa% e6} for every occupancy. High R_p spaces (classrooms, gyms, labs) push outdoor-air fractions above the 70% threshold that triggers ASHRAE 90.1 recovery mandates.

• More outdoor air means more heating and cooling load. A membrane energy recovery ventilator or wheel returns most of that energy to the incoming stream.
• 62.1 requires that ventilation not create pressurization problems. Balanced supply and exhaust with a recovery core keeps the building near neutral pressure.
• In critical spaces, separation matters: labs and cleanrooms favor non-cross-contaminating membrane cores over rotating wheels.

When a space has local exhaust (fume hoods, kitchens), 62.1 requires matching makeup air. That makeup air is a prime recovery candidate — but check the 90.1 exceptions for hazardous and grease exhaust before specifying a wheel.

Start from the 62.1 rate, then run the AHU selection calculation and the AHU component layout with the recovery core in the airstream. Sizing the recovery device first lets you right-size the cooling coil and heating coil on the recovered load, often saving one equipment size.