plazaasg.blogg.se - Ashrae 90.1 pdf free

Lighting solutions such as wireless control systems and light fixtures with integrated daylight sensors are two technologies that can be used to create more daylight zones in a space, as required by ASHRAE 90.1-2022. The lighting committee found that reducing this threshold from 150W to 75W per daylight zone is cost-effective and would result in greater energy savings. This threshold is defined as the minimum wattage for zones which require daylight responsive lighting controls.įor this latest update, ASHRAE re-evaluated the wattage threshold against current “state of the shelf” LED technology, dimming and the cost of sensors.

Revisions in lighting include a reduced lighting power density (LPD) threshold for daylight controls, horticulture lighting and multifamily units. Other changes were made to variable refrigerant flow, DOAS equipment, heat pump chiller requirements, furnace efficiencies and expanded airside economizer requirements.

A change from HSPF (heated seasonal performance factor) to HSPF2, which is how efficiently a heat pump heats up a space in a typical season.

A change for SEER (seasonal energy efficiency ratio) to SEER2, which is the cooling output of an air conditioner or heat pump divided by the energy it uses in a typical season.

Higher IEERs (integrated energy efficiency ratios), i.e.

The standard also includes significant increases in efficiency for unitary rooftop products that went into effect in January 2023.

Expansion of heat pumps with large commercial chiller heat pumps.

Separate ventilation management with low dedicated outdoor air system (DOAS) fan power, demand-controlled ventilation, energy recovery bypass or improved delivery effectiveness.

Reduced pumping energy via better piping design, hydronic configuration, pump selection or pump motor and drive efficiency, and improved pump controls.

Reduced fan energy from fan selection or fan drive and motor efficiency, and improved fan controls.

Improved heating or cooling equipment efficiency with systems like packaged units, heat rejection and large boilers.

To achieve the required TSPR, engineers can combine multiple HVAC efficiency measures including:

model energy standard or code at the national level. The ASHRAE 90.1-2022 update marks the first time an optional compliance path for the total system performance requirement (TSPR) for mechanical systems is included in a U.S. Though it will take some time for jurisdictions to codify these changes, it’s helpful for building owners and facility managers to anticipate what’s coming by way of this latest energy efficiency standard, which is focused more on whole systems and system interactions rather than prescriptive-based component design. With three years elapsing since the 2019 standard, the anticipated release of ASHRAE 90.1-2022 is here.