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 →EN 13053 covers the rating and tolerances of AHU components, including the heat-recovery section.
Read →ISO 9229 standardizes the terms used in thermal insulation and heat transfer - essential for unambiguous specifications.
Read →ASHRAE 62.1 sets minimum ventilation rates; heat recovery helps meet them without a large energy penalty.
Read →ASHRAE Standard 84 defines the North American test procedure for the thermal performance of energy recovery ventilators.
Read →EN 16798 sets ventilation and energy requirements for non-residential buildings and links heat recovery to the EPBD.
Read →EN 308 defines how to measure sensible and latent effectiveness of air-to-air exchangers so quoted performance is verifiable,...
Read →Send us your airflow, temperature and space requirements — we return a sized solution within 2 business days.
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