Independent air-to-air heat-recovery knowledge base
Practical, vendor-neutral guides, comparisons and selection tools for air-to-air heat recovery and heat exchangers — written by Zibo Qiyu’s thermal-engineering team (20+ years, 160+ patents).
Fundamentals of heat recovery — sensible vs enthalpy, core types and how they actually work.
Read →Step-by-step selection, sizing and specification you can apply to a real project.
Read →Plate vs rotary vs heat-pipe — side-by-side trade-offs and when to use each.
Compare →EN 308, EN 13053, ErP/Ecodesign, ASHRAE and CE marking, explained plainly.
Read →A plain-English guide to heat exchangers: the physics of heat transfer, the main families (recuperative, regenerative, run-around), air-to-air types, and the metrics...
Read →HRV or ERV? This guide explains sensible (temperature-only) vs enthalpy (temperature + moisture) recovery, effectiveness, frost and condensate, and when to choose...
Read →A six-step method to select an air-to-air heat exchanger: define the duty, pick a type, size with effectiveness–NTU, check pressure drop, choose...
Read →A survey of where air-to-air heat recovery pays off — data centers, commercial HVAC, industrial drying, cleanrooms, mines, livestock, marine, kilns, cement...
Read →The documents and marks a specifier should require before signing off.
Read →Frost risk drives several selection choices in sub-zero winter design.
Read →Why the extra static pressure from a core can erode your savings, and how to size the fan.
Read →Turn an airflow and temperature difference into a recovered-power number and a core size.
Read →A decision framework for picking the right recovery technology for your project.
Read →A no-moving-parts alternative for rugged, contamination-free sensible recovery.
Read →Send us your airflow, temperature and space requirements — we return a sized solution within 2 business days.
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