Temperature effectiveness compares supply temperature change to the maximum possible:<\/p>\n
This is the number a sensible plate<\/a> reports, and it is what most generic “efficiency” labels mean.<\/p>\n For an enthalpy wheel or membrane, moisture matters, so effectiveness is referenced to the exhaust humidity (dew point):<\/p>\n where W is the humidity ratio. This captures both the temperature and the latent recovery of an enthalpy wheel<\/a> or ERV \u00e0 membrane<\/a>.<\/p>\n 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.<\/p>\n Can dew-point effectiveness exceed temperature effectiveness?<\/strong> They measure different things; a wheel can have high dew-point effectiveness even when temperature effectiveness is modest.<\/p>\n Which matters for cooling load?<\/strong> Both – but latent (dew-point) recovery is what relieves the cooling coil in humid climates.<\/p>\n Need help specifying the right air-to-air heat recovery for your project? Contact the QIYU engineering team<\/a> – WhatsApp +86 157 5335 5505, or email kuns913@gmail.com.<\/p>\n Questions fr\u00e9quemment pos\u00e9es<\/strong><\/p>\n It is the ratio of actual to maximum supply-temperature change using dry-bulb temperatures; the common sensible-effectiveness figure.<\/p>\n<\/div>\n 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.<\/p>\n<\/div>\nepsilon_T = (T_supply_out - T_supply_in) \/ (T_exhaust_in - T_supply_in)<\/code><\/p>\nDew-point effectiveness (total \/ enthalpy)<\/h2>\n
epsilon_DP = (W_supply_out - W_supply_in) \/ (W_exhaust_in - W_supply_in)<\/code><\/p>\nWhich to quote<\/h2>\n
Frequently asked questions<\/h2>\n
What is temperature effectiveness?<\/h3>\n
What is dew-point effectiveness and when does it differ?<\/h3>\n