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ISO/NP 25471 Air handling unit with air- to- air heat or energy recovery exchangers-Testing and rating methods for performance

Scope

This document specifies testing and rating methods for performance of air handling unit, especially one which with air- to- air heat or energy recovery exchangers, hydronic heating and/or cooling heat exchangers, humidifiers and filters etc. as main air processing components, and assembled in factory.

Purpose

It has become the consensus of the international community to deal with global climate changes and the carbon peak as well as carbon emission reduction. Energy saving in building while keeping better indoor air quality both are necessary. It needs outdoor air supply into indoor room. Due to the huge energy difference between indoor and outdoor air in the cooling or heating season, using air handling units assembled in factory with air to air heat or energy recovery exchangers, hydronic heating and/or cooling heat exchangers, humidifiers and filters etc. as main air processing components can reduce the energy consumption for outdoor air treatment and can contribute to building energy conservation and carbon emission reduction and avoid dew formation on the surface of radiate exchanger in room and the relevant hygienic problems. ISO international organization for standardization has developed the standard ISO 16494-1 which is for unit passively recovery exhaust air energy and ISO 21773 for test and characterization of performance of energy recovery components. However, at present, there is still lack of corresponding test and evaluation standard for unit with air to air heat or energy recovery exchangers, hydronic heating and/or cooling heat exchangers, humidifiers and filters etc. as main air processing components, and assembled in factory, which is an important classification of product which popular used in ventilation and air conditioning system in commercial building. By development of this standard, end users can obtain more convenient and energy-saving products, and the government will save more energy and better deal with climate change assessment relevant to HVAC products.

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