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1. #ASHRAE 90.1 2016 WINDOW U VALUE VERIFICATION#
2. #ASHRAE 90.1 2016 WINDOW U VALUE CODE#
3. #ASHRAE 90.1 2016 WINDOW U VALUE PLUS#

The wording of the fan-power allowance for heat-recovery systems was modified to clarify the order of the calculation steps. This removes the credit from systems such as ducted return systems in office buildings that could use return-air plenums.

#ASHRAE 90.1 2016 WINDOW U VALUE CODE#

The fan-power credit for fully ducted systems was revised to only give credit to systems required by code or accreditation standards to be fully ducted.

#ASHRAE 90.1 2016 WINDOW U VALUE PLUS#

Differential pressure control that senses pressure near the critical heat exchanger plus reset of the differential setpoint based on valve position.Variable speed control is required for pumps with motors larger than 5 hp. Variable flow is required for hydronic systems with three or more control valves. The cooling setpoint shall not be below 85☏, and the heating setpoint shall not be above 60☏. Vestibule heating is prohibited when the outside air temperature is above 45☏. Significant increases were made to minimum efficiencies for variable refrigerant flow (VRF) systems. In many of these applications, ECMs are becoming more popular because of the wide speed variation compared to small, 3-speed permanent-split capacitor (PSC) motors. In this edition, ≥1/12- to 1-hp electric motors now have minimum efficiency requirements that push the industry toward 3-phase or electronically commutated motors (ECM). Networked rooms are permitted to return to occupied temperatures 60 minutes prior to expected occupancy. When unrented, the setpoint shall be ≥80☏ in cooling and ≤60☏ in heating. In the 2016 edition, hotels/motels with more than 50 guest rooms are required to have automatic controls for each guest room that raise the cooling and lower the heating setpoint temperature by 4☏ within 30 minutes of all occupants leaving the room.

A table details criteria that require DDC for new buildings, alterations, and additions. These require DDC for most new building air-handling systems, chilled-water, and heating plants. This increases energy efficiency in deadband (assuming that ASHRAE Standard 62.1 is satisfied) and lowers first cost, but increases energy use at times when peak heating is needed.ĭirect digital control (DDC) requirements were added. The reheat limitations were modified in the 2013 edition to require a reduction in flow to 20% in deadband, and were relaxed to allow up to 50% flow at peak heating.

#ASHRAE 90.1 2016 WINDOW U VALUE VERIFICATION#

While the performance requirements have not changed, the standard will clarify that an inspection and verification program must be documented. And third, a new section was added that begins to address air-leakage inspections. Second, changes were made to the fenestration U-factor and SHGC, with some additional modifications made to the fenestration orientation provisions as well. First, minimum heating and cooling capacities that make a space fall into the "heated" or "cooled" categories were reduced. Of the many "in process" addendums, three stand out. The other change is that the envelope-only trade-off option rules were updated so one can use current whole-building energy simulation software.

The standard expanded the areas where daylighting (called toplighting) is required in several large space types, and modified the way the window orientation/area provisions are calculated. Note, the window-to-wall ratio in 2012 IECC is 30%.

The window-to-wall-ratio requirement, however, remained the same at 40%. Insulation values for wall and window U-factor and solar heat gain coefficient (SHGC) were made more stringent.