Views: 1 Author: Site Editor Publish Time: 2024-11-22 Origin: Site
GB/T 20738-2018 'Rooftop Air-Conditioning Unit' is a national standard officially implemented by China's State Administration for Market Regulation and China's National Standardization Administration on December 1, 2018. This standard is intended to stipulate rooftop air conditioning unit technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements to ensure product performance, safety and quality.
The GB/T 20738-2018 'Rooftop Air-Conditioning Unit' standard replaces the previous GB/T 20738-2006 standard and comprehensively updates and improves the technical requirements for rooftop air conditioning units. Rooftop air conditioning units are usually installed on the roof of buildings to provide heating and cooling air conditioning services. Their structural forms include integral, modular, etc.
Scope and normative references:
It is clarified that the applicable objects of the standard are equipment installed on the roof of buildings to provide heating and cooling air conditioning.
A list of other standards and documents that are directly quoted or referred to when implementing this standard is listed.
Terms and definitions:
The related professional terms are clearly defined, such as 'nominal cooling capacity', 'energy efficiency ratio', etc., to help users accurately understand the content of the standard.
Classification and model:
Rooftop air-conditioning units are classified according to structural characteristics, functions, cooling/heating methods, etc., and model compilation rules are stipulated to facilitate users to identify and select appropriate units.
Performance requirements:
Including the minimum standards for key performance indicators such as cooling capacity, heating capacity, air volume, noise level, and energy efficiency ratio.
Materials and components:
Specifies the quality and durability requirements that materials and key components constituting air conditioning units should meet.
Structure and design:
Ensure that the unit has a solid structure and is easy to install and maintain, while also considering the adaptability to outdoor environments such as waterproofing and dustproofing.
Test method:
It details the procedures and conditions for conducting performance tests such as cooling capacity, heating capacity, air volume, noise, etc., as well as the requirements for test equipment to ensure the accuracy and repeatability of test results.
Inspection rules:
It includes two parts: factory inspection and type inspection, and stipulates inspection items, sampling methods, qualification criteria, etc. to ensure that every product shipped meets the standard requirements.
Marking, packaging, shipping and storage:
It is required that products should have clear identification information, such as model number, rated parameters, etc.; at the same time, specific requirements are put forward for packaging materials, methods, and transportation and storage conditions to prevent damage and corrosion.
As an integral air-cooled direct evaporative hot and cold air conditioning unit, the rooftop air conditioning unit has the advantages of compact structure, wide energy range, convenient adjustment, reduced installation time, and cost savings. In recent years, rooftop air-conditioning units have been increasingly used in air-conditioning projects due to their unique advantages. They are not only suitable for comfortable air-conditioned places such as sports venues, lecture halls, convention and exhibition centers, theaters, shopping malls, train stations, and airports. , also suitable for technical air-conditioning places such as machinery, aerospace, medicine, electronics, chemical industry, etc.
The implementation of the national standard GB/T 20738-2018 'Rooftop Air-Conditioning Units' provides unified technical specifications and standards for the design, manufacture, inspection and use of rooftop air conditioning units, which helps to improve the quality of rooftop air-conditioning units in my country. The overall quality and market competitiveness of the unit products. For relevant enterprises and users, being familiar with and mastering this standard is of great significance to ensuring product quality and improving use effects.
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