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Figure 10. Average Water Use (GPM) by Hour of Day (Leak event removed) Overall, there is little difference between weekday and weekend use patterns. Both weekdays and weekends show higher 8-10am, and 6pm usage. Weekday and weekend as well as daily and hourly differences are less pronounced at the Site compared to other multifamily buildings. Multifamily buildings with working occupants typically have low mid-day usage on weekdays when occupants are at work, and weekend morning peaks may be shifted later in the day (Heller 2015). This is likely due to the senior demographic at Site. Recorded flow data also demonstrated annual water usage at the Site. Much as inlet water and outside air temperatures show seasonal cycles, so does occupant water usage. Typically, water use is higher during cooler months and lower in warmer months. Regression analysis was used to estimate, daily delivered hot water for missing periods (approximately a week when the leak and repair resulted in inaccurate flow). With average daily temperatures for these periods, regression analyses were also used to predict a gallons per apartment unit metric, which was then included with measured data to calculate annual estimates. BONNEVILLE POWER ADMINISTRATION 14PDF Image | CO2 Heat Pump Water Heater Multifamily Retrofit
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