ASHRAE 90.1
Encyclopedia
ASHRAE 90.1 is a standard that provides minimum requirements for energy efficient designs for buildings except for low-rise buildings. The original standard ASHRAE 90 was published in 1975 and had multiple editions to it in years after. In 1999 the Board of Directors for ASHRAE voted and placed the standard on continuous maintenance, which allowed it to be updated multiple times in a year. This is because of the rapid change in technology and energy prices. Now the standard is ASHRAE 90.1 and started in 2001. It has been updated a in 2004, 2007, and 2010 since. The updates come from making technologies more efficient and developing new technologies.
There are many states that apply the ASHRAE 90.1 standard to different buildings that are being constructed or under renovation. Most states apply the standard or equivalent standards for all commercial buildings while others apply the standard or equivalent standards for all government buildings. There are a couple other states that use other energy conservation standards for all commercial buildings and a couple other states use a combination of the ASHRAE 90.1 standard for all government buildings and use other energy conservation standards for their commercial buildings. While there are still couple states that do not apply any energy conservation standards for their government and commercial buildings.
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. The requirements for these provisions are in the ASHRAE 90.1 manual and have many requirements for each. 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. ASHRAE 90.1 document has multiple tables that give minimum efficiency requirements for each system.
Hot water systems must go through a load calculation before they are installed. Each system must meet the manufactures sizing guidelines. Each system must also must have equipment that meets the minimum efficiency that is in a table in the ASHRAE 90.1 document. 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. There are also interior lighting controls that need to be installed for buildings larger than 5000 sqft. There are also many requirements on lighting that include exit signs and exterior lights.
There are many states that apply the ASHRAE 90.1 standard to different buildings that are being constructed or under renovation. Most states apply the standard or equivalent standards for all commercial buildings while others apply the standard or equivalent standards for all government buildings. There are a couple other states that use other energy conservation standards for all commercial buildings and a couple other states use a combination of the ASHRAE 90.1 standard for all government buildings and use other energy conservation standards for their commercial buildings. While there are still couple states that do not apply any energy conservation standards for their government and commercial buildings.
2004
In 2004 the ASHRAE 90.1 standard applied to buildings, the building envelope, and majority of mechanical and lighting systems in the building. 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. For ASHRAE 90.1 standard to apply to the building envelope the building will need to be heated by a heating system that has an output capacity greater than 3.4 btu/h-ft2 or be cooled by a cooling system that has an output capacity greater than 5 btu/h-ft2. The buildings that are exempted from ASHRAE 90.1 are single family homes, multifamily of three stories or less homes, manufactured or modular homes, buildings that do not use electricity or fossil fuels, and equipment and building systems that are used that are used for industrial, manufacturing, or commercial purposes.2007
In 2007 the updated version of the ASHRAE 90.1 covers many sections of a building which include building envelope, HVAC, hot water, and lighting.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. The requirements for these provisions are in the ASHRAE 90.1 manual and have many requirements for each. 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. ASHRAE 90.1 document has multiple tables that give minimum efficiency requirements for each system.
Hot water systems must go through a load calculation before they are installed. Each system must meet the manufactures sizing guidelines. Each system must also must have equipment that meets the minimum efficiency that is in a table in the ASHRAE 90.1 document. 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. There are also interior lighting controls that need to be installed for buildings larger than 5000 sqft. There are also many requirements on lighting that include exit signs and exterior lights.