MALB_2014 with 1-21 Revisions

CG Section 5 MAMF/MALB Companion Guidance 2021 Section 5 Average Building Conditions 9 CALCULATING AVERAGE BUILDING OPERATING CONDITIONS The following methodology is intended to be simplistic yet reasonable for use. 1) Know The Average Occupied Indoor Temperature: 74˚ F (23˚ C) Due to required comfort for occupants, the average indoor temperature is usually maintained with stability between 68˚ to 82˚ F (20˚ to 28˚ C). Use an average of about 74˚ F (23˚ C) during estimations unless known to be specifically different. HVAC systems are set to respond to needs for maintaining this comfort range during significantly occupied periods. 2) Identify When The Building Is Significantly Occupied 3) Identify The Average Local Outdoor Temperatures During Significantly Occupied Months HVAC systems respond to changes in outdoor temperatures by activating heating, cooling and ventilation air handlers including certain designs that introduce outdoor air ventilation into a building. 4) Identify Periods When Heating and Cooling Systems Activate Heating Systems In response to needs for indoor comfort: Heating systems will often activate when outdoor temperatures drop to below about 65° F (18˚ C). Cooling Systems In response to needs for indoor comfort: Cooling systems will normally be active when outdoor temperatures exceed about 75° F (28˚ C). Examples of Heating and Cooling Activity 24 Hour Averages Daytime Only Averages