ISO 21773:2021 PDF

Scope: This document specifies methods for testing and characterizing the performance of air-to-air heat/ energy exchangers when used as devices to transfer heat or heat and water vapor between two airstreams used in ventilation systems. It also specifies methods to characterize the performance of exchangers for use in calculation of the energy performance of buildings. This document is applicable to: — fixed-plate exchangers (also known as recuperators), — rotary exchangers, including heat wheels and total energy wheels (also known as regenerators), — heat pipe exchangers using a heat transfer medium, excluding those using mechanical pumping. This document does not provide a method for measuring the response of exchangers to the formation of frost.

ISO 21773:2021 Referenced Document

ISO 13253 Ducted air-conditioners and air-to-air heat pumps — Testing and rating for performance — Amendment 1
ISO 3966 Measurement of fluid flow in closed conduits — Velocity area method using Pitot static tubes
ISO 5167-1 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 1: General principles and requirements*， 2022-06-16 Update
ISO 5801 Fans*， 2024-02-01 Update
ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories

2021 ISO 21773:2021 Methods of test and characterization of performance for energy recovery components