Temperature effectiveness (sensible)
Temperature effectiveness compares supply temperature change to the maximum possible:
epsilon_T = (T_supply_out - T_supply_in) / (T_exhaust_in - T_supply_in)
This is the number a sensible plate reports, and it is what most generic “efficiency” labels mean.
Dew-point effectiveness (total / enthalpy)
For an enthalpy wheel or membrane, moisture matters, so effectiveness is referenced to the exhaust humidity (dew point):
epsilon_DP = (W_supply_out - W_supply_in) / (W_exhaust_in - W_supply_in)
where W is the humidity ratio. This captures both the temperature and the latent recovery of an enthalpy wheel or ERV à membrane.
Which to quote
For sensible-only units, temperature effectiveness is the honest figure. For total-energy recovery, dew-point (or enthalpy) effectiveness is the right one – quoting only temperature understates the latent saving. Always check which basis a supplier uses when comparing devices.
Frequently asked questions
Can dew-point effectiveness exceed temperature effectiveness? They measure different things; a wheel can have high dew-point effectiveness even when temperature effectiveness is modest.
Which matters for cooling load? Both – but latent (dew-point) recovery is what relieves the cooling coil in humid climates.
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.
Questions fréquemment posées
What is temperature effectiveness?
It is the ratio of actual to maximum supply-temperature change using dry-bulb temperatures; the common sensible-effectiveness figure.
What is dew-point effectiveness and when does it differ?
Dew-point effectiveness uses the enthalpy or humidity potential instead of dry-bulb; for enthalpy wheels recovering moisture it can be quite different from temperature effectiveness, so both numbers are reported.
Questions fréquemment posées
What is temperature effectiveness?
It is the ratio of actual to maximum supply-temperature change using dry-bulb temperatures; the common sensible-effectiveness figure.
What is dew-point effectiveness and when does it differ?
Dew-point effectiveness uses the enthalpy or humidity potential instead of dry-bulb; for enthalpy wheels recovering moisture it can be quite different from temperature effectiveness, so both numbers are reported.
Spécifiez le bon échangeur
Nos ingénieurs dimensionnent le noyau selon votre débit, température et budget de perte de charge, et choisissent la récupération par plaque, rotative ou caloduc selon l'application. Lisez le guide de l'échangeur , ou contactez-nous pour une spécification.
Produits connexes
Récupération par plaque, rotative ou caloduc pour le CVC et la ventilation.
Noyaux stationnaires à grande surface pour l'air et le liquide.
Récupération d'énergie à haute efficacité pour grands débits.
Courants passifs et totalement séparés pour applications propres.