21989-2

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21989-2 standard is a keystone document related to the technological field of HVAC, which serves as supportive instruction for the construction and functioning of HVAC installations. This standard defines how an HVAC installation should be designed in order to ensure optimal performance, maintain efficiency, and provide a safe environment. The governing principles of the 21989-2 standard are efficiency, safety, and environmental sustainability.

The 21989-2 standard is based on common sense, physics, engineering, and practical considerations. The general purpose is to provide a framework for effectively designing and constructing HVAC systems while aligning with current standards and recognized best practices. It covers the functions of air conditioning systems as well as their components, from air handling units to fans and vents. The 21989-2 standard also includes guidelines related to materials, installation, energy conservation, and air quality.

The application of the 21989-2 standard is varied and includes the design of residential, industrial, commercial, and environmental HVAC systems and also mechanical plants. The standard is also relevant to the fire safety of HVAC systems, with guidelines covered for the application of fireproofing material, installation of alarms, and design of ventilation systems. These standards are established to ensure safe functioning of systems in both domestic and commercial buildings.

The 21989-2 standard features principles of design and construction that influence the energy efficiency of the systems. This includes the concept of "heat loads", which are based on thermal discomfort in a dwelling or premise and the need for energy to meet the temperature requirements of the facility. Heat loads are generally determined by the maximum exterior temperature, size of the exterior surfaces, type of insulation used, and type of air distribution system.

The working principles of the 21989-2 standard are mainly involved with energy efficiency calculation. The energy efficiency is determined by two basic factors: the heat load and the efficiency of the chosen equipment. Heat loss and gain processes must be considered in order to determine the actual energy efficiency of the installation. The regulations of the standard provide guidelines for calculating the heat transfer coefficient, which is used to determine the energy efficiency of a system. High-efficiency systems are designed in such a way that the thermal efficiency is maximized.

In summary, the 21989-2 standard is a cornerstone document related to the field of HVAC, providing guidelines for the design, construction, and functioning of HVAC installations. The working principle of the standards are related to heat loads, energy efficiency calculations, and effective installation of fire safety systems. The application of the 21989-2 standard is varied and includes residential, industrial, commercial, and environmental HVAC systems. With efficient design and construction, HVAC systems can provide a safe and comfortable living environment while conserving energy.

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