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 →Balancing effectiveness, pressure drop, and core size.
Read →Where recovery sits in the whole-building energy equation.
Read →Why the core's resistance is part of the energy balance.
Read →The field procedure to verify a real installation.
Read →A worked example of the effectiveness formula.
Read →Turning moist-air states into a recovery selection.
Read →Send us your airflow, temperature and space requirements — we return a sized solution within 2 business days.
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