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Healthy Building Initiative: General Services Administration Pilot Study Healthy Building Initiative: General Services Administration Pilot Study Figure 1. Modules comprising the HBI framework methodology. The U.S. Department of Energy’s Federal Energy Management Program Methodology (such as circadian rhythm, immune (FEMP), in partnership with the system, stress, mood, productivity, and The methodology developed by PNNL General Services Administration cognitive function). The correlations (outlined in Figure 1) estimates the (GSA), is investigating how traditional derived from laboratory and empirical potential financial gains from occupant productivity improvements and identifies building energy efficiency measures studies have not been directly translated specific modifications customized for a can impact health in the federal to decision making in building system design and operation. building. There are three modules within sector through the Healthy Buildings the overall methodology framework: Initiative (HBI). Comprehensively quantifying a building’s health performance can Module 1 collects baseline IEQ data by FEMP is currently funding research at be expensive and time-consuming. monitoring parameters such as carbon Pacific Northwest National Laboratory Beyond evaluation, a critical need of dioxide, temperature, humidity, and light levels, and administering an occupant (PNNL) to develop a framework for implementing healthy building research is to identify actionable improvement survey. evaluating indoor environmental strategies that target the specific building quality (IEQ) metrics and quantifying Module 2 uses the baseline IEQ data to system and operational issues a building guide the collection of additional building the potential financial costs and is facing. HBI targets these two chal- characteristic, operation, and asset infor- gains related to improving occupant lenges by providing an easily navigable, mation needed to understand the reasons productivity in federal buildings. The low-burden data collection process for IEQ issues. This information is used and streamlined recommendations and goal of this initiative is to facilitate to identify specific improvement actions financial analysis. more holistic decision making. This to help achieve the IEQ targets. case study uses existing IEQ data This study attempts to leverage existing An optional component of the framework from four GSA sites. The case study building data to 1) compare four build- is to create an energy model and provide ings at a high level to identify potential examines the process for analyzing estimated retrofit costs. productivity gains and 2) delve into large amounts of data to prioritize the data trends for customized recom- The data from Module 1 is also used buildings within a portfolio and to mendations. Using data from GSA’s in Module 3 to estimate the potential provide customized improvement Wellbuilt for Wellbeing (WB2) project, productivity improvement for a building. recommendations. the PNNL team presents an easy-to- PNNL developed a series of correla- implement process for evaluating IEQ tions between IEQ metrics and human Background metrics to yield impactful and action- productivity from a meta-analysis of able recommendations for improving 51 experimental conditions from peer- Environmental psychology, medical occupant health and productivity in office reviewed academic studies. The potential research, and building technology studies buildings. productivity gains between the baseline have revealed how IEQ (such as lighting, IEQ values and the target IEQ values are thermal comfort, and air quality) affects converted to financial gains using the cost human health, comfort, and performance of employees in the building. Figure 2. Density plots for PMV on left (a) and CO2 on right (b) for the four GSA sites. Case Study Overview air temperature and relativity humidity, comfort. CO2 concentration indicates the This case study uses the framework in which are used to calculate predictive extent to which adequate fresh outdoor 1 Figure 1 to compare a portfolio of build- mean vote (PMV), representing the air is being supplied to the space, which ings, leveraging the existing WB2 IEQ thermal comfort category. The HBI is one part of the overall IAQ picture. measurement and survey data. The PNNL methodology also includes horizontal Outdoor air is not only important for team applied the methodology to four illuminance (representing lighting), but maintaining low CO2 levels, but also GSA sites, representing a combination of useful lighting data are not available for removing human bioeffluents (odor, new and legacy building systems and a through the WB2 study. Therefore, moisture), volatile organic compounds, diversity of interior office space designs lighting is excluded in this study. and other indoor contaminants. Less than 750 ppm of CO2 is used as a target, and uses. The WB2 dataset contains The second analysis is a deep dive almost 1 year of 5-minute interval based on WELL Building Standard into one of the sites to illustrate the Credit A06 part 2a. The minimum design measurements (temperature, humidity, process that identifies specific problems requirement for CO2 is shown in Figure CO2, particulate matter [PM], sound, and and recommends building operation 2 based on the minimum ventilation others) taken from approximately 100 and system improvements to promote sensors at each of the four GSA buildings rates in breathing zones in ASHRAE occupant health. The data for circadian Standard 62.1, which approximates to in 2015 and 2016. Each study area within 2 stimulus (CS) and PM are not used for 1,000 ppm in office spaces. The PMV the four buildings – which are located in the financial analysis in the first analysis the Mid-Atlantic region and Texas and range of -1.0 to +1.0, which is defined as because there are inadequate empirical “slightly cool” to “slightly warm” in the are labeled A, B, C, and D in this study studies to create economic models. for anonymity – covers roughly 50,000 PMV model, is also shown for reference. However, they are proven important This study aims to set up a near-optimal square feet of floor area with 300 staff IEQ parameters and are used to identify across several floors. building performance goal as the target healthy building improvements. value. This case study is divided into two separate analyses. The first analysis Analysis 1: A High-Level As shown in the PMV plot in Figure 2(a), Building A has the best performance for calculates the potential financial gains Portfolio Comparison from improving occupant health at the thermal comfort (most values within the The PMV and CO trends are shown in four GSA sites. This analysis shows 2 target range), followed by Building D. All Figure 2. These density plots reveal a how IEQ data can be used to prioritize four buildings tend towards the cool side high-level assessment of how the GSA buildings within a portfolio for improve- of thermal comfort. In the case of CO2, sites compare to optimal IEQ values ments if there are limited resources for all four buildings perform similarly and (defined as “Target”).ASHRAE Standard retrofitting the entire portfolio. The data maintain the majority of readings below 55, Thermal Environmental Conditions supplied by the WB2 study used for this the 750-ppm target. Building A has the for Human Occupancy, defines the PMV analysis includes CO , representing the worst performance for CO2 (a relatively 2 comfort range to be between -0.5 and indoor air quality (IAQ) category, and longer tail beyond the target) among the +0.5, which is used as the target for four buildings. 1 PMV is a measure of thermal sensation calculated from temperature, relative humidity, and other factors on a scale from -3 (cold) to +3 (hot). The calculations are based on a large sample of empirical human responses. 2 Circadian stimulus measures the effectiveness of light to promote biological regulation of sleep cycles based on the intensity and color distribution of the light. These data were retrieved from a daylighting research study conducted at the GSA Central Office Building following the building’s 2013 renovation. 2 Table 1. Financial gains from improving productivity for the four buildings and core body temperature. The metric ranges from 0 (no stimulus) to 0.7 (full in 10-year net present value per occupant. saturation). According to the Rensselaer CO2 PMV Combined Polytechnic Institute Lighting Research Center, the recommended exposure is Building A <$1K $15K $16K a CS of 0.3 or greater at the eye (the Building B <$1K $34K $34K equivalent of 180 lux from daylight) for at least 1 hour in the early part of the day Building C <$1K $18K $18K (9 a.m. to 1 p.m.). The PM values are in units of counts of particles Building D $0 $6K $6K 1 µm and larger per liter of air (counts/L). The target for PM is 400 counts/L or less The results of the studies used in the regression under similar IEQ conditions as the for a 1-hour average value. values measured in the buildings demonstrate a prediction range of $0 to $22K for Building A, $0 to $60K for Building B, $0 to $34K for Building C, and $0 to $10 for These target values are designed for Building D, all in 10-year NPV per occupant. achieving optimal or near-optimal working conditions and are more strin- Table 1 summarizes results from the per 10 years, respectively. This analysis gent than conventional or expected values net present value (NPV) calculations does not include the cost of improving for an office building. Currently, there is for potential improvements to IAQ, the thermal comfort of these buildings no minimum standard for CS. ASHRAE thermal comfort, and combined values. or the energy cost/savings. Over-cooling 62.1 requires minimum MERV 8 filters The results are presented as dollars or over-heating often can be solved for removing PM from outdoor air, but per occupant per year so that they are with operational improvements and there is no minimum standard or require- comparable between the buildings.
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