ERV: Units equipped with a heat and humidity recovery core (enthalpic core)
can reduce ventilation costs in winter as well as in summer.
1. During the heating season,
the unit draws the humidity and heat from the
stale air and transfers them, in part, to the cold air entering the house, thus
avoiding dryness problems and providing maximum comfort.
In order to preserve the structure of the enthalpic core, the unit will only
exchange 20 minutes per hour when the temperature drops under -15°C
(5°F).
Example
(in winter)
:
1.3 RECOVERY
5
HRV: Units equipped with a heat recovery core (polypropylene core) are
specifically designed to control excess humidity and reduce ventilation costs by
recovering the heat energy from the exhausted air, and using that same heat
energy to warm the fresh air being supplied. This heat recovery process is
accomplished in such a way that the stale air is never mixed with the fresh air.
Example
(in winter)
:
OUTSIDEINSIDE
STALE AIR TO OUTSIDE 4°C/40°F
FRESH AIR TO BUILDING 18°C/64°F
FRESH AIR FROM OUTSIDE 0°C/32°F
STALE AIR FROM BUILDING 22°C/72°F
VF0011
2. During the cooling season, the unit reverses the process, preventing the
humidity from the outside air from entering into the house.
Example
(in summer with air conditioning)
:
OUTSIDEINSIDE
VF
2
STALE AIR TO OUTSIDE 4°C/40°F
FRESH AIR TO BUILDING 18°C/64°F
FRESH AIR FROM OUTSIDE 0°C/32°F
STALE AIR FROM BUILDING 22°C/72°F
OUTSIDEINSIDE
VF
2
STALE AIR TO OUTSIDE 30°C/86°F
FRESH AIR TO BUILDING 27°C/80°F
FRESH AIR FROM OUTSIDE 32°C/90°F
STALE AIR FROM BUILDING 25°C/77°F
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