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It is frequently used as a baseline for comparison during energy retrofit projects or any project that employs building performance simulation. Development of Standard 90 began in the aftermath of the energy crisis of The development of the proposed standard, Standard 90P, was completed in less than six months. A draft of the standard was issued on June 21, , to 5, industry stakeholders for public review.
New buildings being constructed and the systems that run the new buildings would be covered by the standard. The standard would also apply to additions to existing buildings and their systems as well as alterations to an existing buildings system. The building envelope has to be categorized into 3 different categories of conditioned space which are a nonresidential conditioned space, b residential conditioned space, and c semiheated space. Each one has different requirements to meet.
There are also mandatory provisions that building envelopes have to abide by which are insulation, fenestration and doors, and air leakage. Each section of the building envelope, Roof, Walls, and Floor have different requirements for each of the mandatory provisions. The HVAC system has many different requirements that have to be met.
This is because there are many types of HVAC systems each with different requirements. The HVAC section has the most requirements because there are so many different types of systems. There are systems that can not be used and things that systems must have to meet the requirements. Hot water systems must go through a load calculation before they are installed. Each system must meet the manufactures sizing guidelines.
The pipes that hold the hot water need to be insulated and there are certain insulation requirements for each system type and piping material. The standard provides the minimum requirements for energy-efficient design of most buildings, except low-rise residential buildings. It is an indispensable reference for engineers and other professionals involved in design of buildings and building systems.
Because the standard is written in mandatory language and therefore not intended as a design specification or an instruction manual, this User's Manual was developed to minimize multiple interpretations of Standard Each one has different requirements to meet. There are also mandatory provisions that building envelopes have to abide by which are insulation, fenestration and doors, and air leakage.
Each section of the building envelope, Roof, Walls, and Floor have different requirements for each of the mandatory provisions. The HVAC system has many different requirements that have to be met.
This is because there are many types of HVAC systems each with different requirements. The HVAC section has the most requirements because there are so many different types of systems. There are systems that can not be used and things that systems must have to meet the requirements.
Hot water systems must go through a load calculation before they are installed. Each system must meet the manufactures sizing guidelines. The pipes that hold the hot water need to be insulated and there are certain insulation requirements for each system type and piping material. There are many controls that hot water systems need and each control has a different requirement. These include are temperature controls, temperature maintenance controls, outlet temperature controls, and circulation pump controls.
There are also requirements for pool heaters, pool covers, and heat traps for heated pools. If new lights are installed or replaced in any building space, with a few exceptions, they must abide by the Lighting Power Density requirements. Lighting also has many requirements to follow, which includes the prescriptive requirements to determine the quantity of lights for the building.
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