Table of Contents
- 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.
- Bypass / air-side economiser: in mild weather the core is bypassed so you get free cooling instead of unwanted recovery. Defrost management: good defrost keeps winter effectiveness up without over-preheating. Part-load control: EC fans and variable flow keep recovery useful at low rates.
- Because seasonal efficiency drives the actual utility bill, it - not the nameplate - belongs in the payback calculation. A unit with modest rated effectiveness but a smart bypass often beats a higher-rated unit that runs the core year-round.
- Can recovery ever waste energy? In shoulder seasons without bypass, yes - it can reheat or recool unnecessarily; that is why economiser logic matters. Where is seasonal efficiency reported? Increasingly in energy-code compliance and product labelling; ask for it, do not assume the rated number. Need help specifying the right air-to-air heat recovery for your project? Contact the QIYU engineering team - WhatsApp +86 157 5335 5505, or email kuns913@gmail.com. Frequently Asked Questions Why is nameplate effectiveness not the whole story? Effectiveness varies with outdoor temperature, airflow balance and part-load; seasonal efficiency weights it by the hours and temperatures actually experienced through the year. What improves seasonal performance? Balanced airflow, frost control that minimises bypass hours, and control that keeps the wheel or exchanger engaged whenever there is a useful temperature or humidity difference.
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.
- Bypass / air-side economiser: in mild weather the core is bypassed so you get free cooling instead of unwanted recovery.
- Defrost management: good defrost keeps winter effectiveness up without over-preheating.
- Part-load control: EC fans and variable flow keep recovery useful at low rates.
Because seasonal efficiency drives the actual utility bill, it - not the nameplate - belongs in the payback calculation. A unit with modest rated effectiveness but a smart bypass often beats a higher-rated unit that runs the core year-round.
Can recovery ever waste energy? In shoulder seasons without bypass, yes - it can reheat or recool unnecessarily; that is why economiser logic matters.
Where is seasonal efficiency reported? Increasingly in energy-code compliance and product labelling; ask for it, do not assume the rated number.
Need help specifying the right air-to-air heat recovery for your project? Contact the QIYU engineering team - WhatsApp +86 157 5335 5505, or email kuns913@gmail.com.
Frequently Asked Questions
Why is nameplate effectiveness not the whole story?
Effectiveness varies with outdoor temperature, airflow balance and part-load; seasonal efficiency weights it by the hours and temperatures actually experienced through the year.
What improves seasonal performance?
Balanced airflow, frost control that minimises bypass hours, and control that keeps the wheel or exchanger engaged whenever there is a useful temperature or humidity difference.